SIR Section J.8 6850_91_TIB.pdf

TI 6850.91

INSTRUCTION BOOK

REMOTE RADIO CONTROL

INTERFACE UNIT

TYPE FA-16100

National Airway Systems Engineering Division, AOS-200

Navigation Systems Branch, AOS-240

Federal Aviation Administration Mike Monroney Aeronautical Center

6500 South MacArthur Blvd.

Oklahoma City, Oklahoma 73125

MADE FOR

U. S. DEPARTMENT OF TRANSPORTATION

FEDERAL AVIATION ADMINISTRATION

October 11, 2000

RECORD OF CHANGES DIRECTIVE NO. TI 6850.91

CHANGE SUPPLEMENT CHANGE SUPPLEMENT

TO OPTIONAL TO OPTIONAL

BASIC BASIC

FAA Form 1320-5 (6-80) USE PREVIOUS EDITION

10/11/2000 TI 6850.91

i

TABLE OF CONTENTS

Paragraph Page

SECTION 1. GENERAL INFORMATION AND REQUIREMENTS

1.1 Introduction ................................... 1-1

1.2 Equipment Description .......................... 1-3

1.2.1 Operating Modes ................................ 1-3

1.2.1.1 Ground-to-Ground (G/G) Mode .................... 1-3

1.2.1.2 Air-to-Ground (A/G) Mode ....................... 1-3

1.3 Relationship of Units .......................... 1-4

1.3.1 Functional Description ......................... 1-4

1.4 Equipment Specification Data ................... 1-6

1.5 Equipment and Accessories Supplied ............. 1-7

1.6 Equipment Required But Not Supplied ............ 1-7

SECTION 2. TECHNICAL DESCRIPTION

2.1 Simplified Theory of Operation ................. 2-1

2.1.1 Functional Circuits ............................ 2-1

2.1.1.1 G/G Receiver Decoder to RRCIU .................. 2-1

2.1.1.2 A/G Receiver Controller to RRCIU ............... 2-3

2.1.1.3 MALSR Control Unit to RRCIU .................... 2-4

2.1.1.4 MALSR RMS Cabinet to RRCIU ..................... 2-4

2.1.2 Relays ......................................... 2-4

2.1.2.1 Non-Latching Relays ............................ 2-5

2.1.2.2 Latching Relays ................................ 2-5

2.1.3 Power Supply ................................... 2-5

2.2 Detailed Theory of Operation ................... 2-5

2.2.1 Steering Diodes ................................ 2-5

2.2.2 Functional Descriptions ........................ 2-6

2.2.2.1 Ground-to-Ground (G/G) Control Command ......... 2-6

2.2.2.2 Air-to-Ground (A/G) Enable Control Command ..... 2-7

2.2.2.3 Ground-to-Ground (G/G) Low Intensity

Control Command ................................ 2-7

2.2.2.4 Ground-to-Ground (G/G) Medium Intensity

Control Command ................................ 2-7

2.2.2.5 Ground-to-Ground (G/G) High Intensity

Control Command ................................ 2-8

2.2.2.6 Ground-to-Ground (G/G) MALSR OFF

Control Command ................................ 2-8

TI 6850.91 10/11/2000

TABLE OF CONTENTS (CONTINUED)

ii

Paragraph Page

SECTION 2. TECHNICAL DESCRIPTION (Continued)

2.2.2.7 Ground-to-Ground (G/G) Flasher On

Control Command................................. 2-8

2.2.2.8 Ground-to-Ground (G/G) Flasher Off

Control Command................................. 2-8

2.2.2.9 Air-to-Ground (A/G) Control Low Intensity....... 2-8

2.2.2.10 Air-to-Ground (A/G) Control Medium Intensity.... 2-9

2.2.2.11 Air-to-Ground (A/G) Control High Intensity...... 2-9

2.2.2.12 Test Pins....................................... 2-9

2.2.2.13 Lightning Arresters............................. 2-10

SECTION 3. OPERATION

3.1 Introduction.................................... 3-1

3.2 Controls and Indicators......................... 3-1

3.3 Operating Procedures............................ 3-1

3.4 Operator Maintenance............................ 3-1

SECTION 4. STANDARDS AND TOLERANCES

4.1 General......................................... 4-1

SECTION 5. PERIODIC MAINTENANCE

5.1 General......................................... 5-1

5.2 Performance Checks.............................. 5-1

5.3 Other Onsite Maintenance Tasks.................. 5-2

5.4 Offsite Maintenance............................. 5-2

SECTION 6. MAINTENANCE PROCEDURES

6.1 General......................................... 6-1

6.2 Test Equipment Required......................... 6-1

6.3 Performance Checks and Maintenance Procedures... 6-1

6.3.1 Monthly Performance Checks...................... 6-1

6.3.2 Quarterly Performance Checks.................... 6-4

6.3.3 Monthly Maintenance Checks...................... 6-8

6.3.4 Adjustment of Power Supply PS1.................. 6-8

6.3.5 Replacement of Assembly Components.............. 6-8

iii

Paragraph Page

SECTION 7. CORRECTIVE MAINTENANCE

7.1 General ........................................ 7-1

7.2 Troubleshooting ................................ 7-1

7.3 Test Equipment Required ........................ 7-1

SECTION 8. PARTS LIST

8.1 General ........................................ 8-1

8.2 List of Manufacturers .......................... 8-1

SECTION 9. INSTALLATION, INTEGRATION, AND CHECKOUT

9.1 General ........................................ 9-1

9.2 Unpacking and Repacking ........................ 9-1

9.3 Installation ................................... 9-1

9.3.1 Input Requirements ............................. 9-1

9.3.2 Installation Checkout .......................... 9-1

9.3.3 Installation Verification Test ................. 9-2

SECTION 10. COMPUTER SOFTWARE

10.1 General ........................................ 10-1

SECTION 11. TROUBLESHOOTING SUPPORT DATA

11.1 General ........................................ 11-1

APPENDIX A. GLOSSARY

iv

LIST OF ILLUSTRATIONS

Figure Page

Family Tree Chart, Type FA-16100, Remote Radio Control, Interface Unit............ v

1-1 Remote Radio Control Interface Unit, Type FA-16100 (2 Sheets)........................ 1-1

1-2 Relationship of Units........................... 1-5 2-1 Functional Block Diagram, Interface Unit........ 2-2 6-1 Parts Location Diagram, Interface Unit.......... 6-2 6-2 Printed Circuit Board Layout

(Silkscreen) (3 Sheets)......................... 6-10 9-1 Shipping Container and Packing Materials for

Interface Unit.................................. 9-3 9-2 Installation Layout Pattern, Interface Unit..... 9-4 9-3 Interconnection Diagram, Interface Unit......... 9-5 11-1 Schematic Wiring Diagram, Interface Unit........ 11-3

LIST OF TABLES

Table Page

1-1 Equipment Specification Data.................... 1-6 1-2 Equipment and Accessories Supplied.............. 1-7 2-1 Relay Functions................................. 2-6 2-2 Test Pins....................................... 2-10 4-1 Standards and Tolerances........................ 4-1 5-1 Performance Checks.............................. 5-1 5-2 Other Maintenance Tasks......................... 5-2 6-1 Test Equipment Required......................... 6-1 7-1 Troubleshooting Chart........................... 7-2 8-1 Parts List...................................... 8-2 8-2 List of Manufacturers........................... 8-3

FAMILY TREE CHART, TYPE FA-16100,

REMOTE RADIO CONTROL, INTERFACE UNIT

T I v v i

1-1

SECTION 1. GENERAL INFORMATION AND REQUIREMENTS

1.1 INTRODUCTION.- This instruction book contains the information required to install, maintain, and repair the Remote Radio Control Interface Unit (RRCIU), Type FA-16100 (see figure 1-1). The Remote Radio Control Interface Unit, hereinafter referred to as the interface unit, is built in conformance to Federal Aviation Administration Specification FAA-E-2663a, dated November 19, 1999.

Figure 1-1. REMOTE RADIO CONTROL INTERFACE UNIT, TYPE FA-16100 (PHOTOGRAPH, FRONT) (SHEET 1 OF 2)

1-2

Figure 1-1. REMOTE RADIO CONTROL INTERFACE UNIT, TYPE FA-16100 (PHOTOGRAPH, INSIDE)(SHEET 2 OF 2)

1-3

1.2 EQUIPMENT DESCRIPTION.– The interface unit consists of an enclosure with a hinged cover. The enclosure contains a 24 V dc power supply, relays, terminal blocks, wiring, and associated circuitry. The interface unit will work with the Medium Intensity Approach Lighting System with Runway Alignment Indicator Lights (MALSR), Runway End Identifier Lights (REIL), Precision Approach Path Indicator (PAPI), and Visual Approach Slope Indicator (VASI).

In this manual, the MALSR will be discussed since it is the most complex of the lighting systems that the RRCIU can be attached to.

The interface unit is capable of controlling the Medium-Intensity Approach Lighting System with Runway Alignment Indicator Lights (MALSR) from signals received from a ground-to-ground (G/G) receiver decoder unit. The interface unit is also capable of controlling the Medium-Intensity Approach Lighting System (MALS) from signals received from an air-to-ground (A/G) receiver controller. When the system is under G/G control, the sequence flashers and approach lights are controlled by control tower personnel. When the system is under A/G control, the approach lights are controlled by the aircraft pilot. When the system is changed from A/G back to G/G the system will go back to the last setting that it was in when in G/G mode.

1.2.1 Operating Modes.- The interface unit has two modes of

operation; G/G mode and A/G mode.

1.2.1.1 Ground-to-Ground (G/G) Mode. In the ground-to-ground

mode, signals are transmitted from the Flight Service Station (FSS) or Airport Traffic Control Tower (ATCT) and received via the ground-to-ground receiver-decoder unit. The interface unit responds to these signals to actuate and control the MALSR.

1.2.1.2 Air-to-Ground (A/G) Mode. In the air-to-ground mode, and when the ATCT is unmanned, the interface unit is enabled. The interface unit then responds to signals transmitted by an overhead aircraft and received via the air-to-ground receiver controller unit. The interface unit responds to these decoded signals to actuate and control the MALS. The A/G unit will automatically turn off the MALS system after 15 minutes of operation.

1-4

NOTE

When in the air-to-ground mode of operation, the Runway Alignment Indicator Lights (RAIL) sequence flashers turn on with any intensity selected.

1.3 RELATIONSHIP OF UNITS.- The relationship between the

interface unit, the G/G receiver decoder, the A/G receiver controller, and the MALSR control unit is shown in figure 1-2.

1.3.1 Functional Description.– As shown in figure 1-2, the inter-face unit receives 120 V ac primary power from the MALSR. The interface unit uses the 120 V ac for two purposes. The first is as a source of power for the 24 V dc power supply. The second is to generate the control signals necessary to select the various operating modes of the MALSR. The 24 V dc from the power supply is routed to the G/G receiver decoder where the G/G receiver decoder returns the voltage to the interface unit to select the various modes of operation of the MALSR. In the A/G mode of operation the interface unit’s 120 V ac is routed through relays in the A/G receiver and back to the interface unit to select the operating mode.

Figure 1-2. RELATIONSHIP OF UNITS

T I

1-6

1.4 EQUIPMENT SPECIFICATION DATA.- Specification data for the interface unit is provided in table 1-1.

Table 1-1. EQUIPMENT SPECIFICATION DATA

Nameplate Data

Name of Equipment Remote Radio Control Interface Unit

Manufacturer Federal Aviation Administration

FAA Equipment Type No. FA-16100

Equipment Model AE-D-1457

Functional Characteristics

Control Signal Inputs 24 V dc for ground-to-ground mode 120 V ac for air-to-ground mode

Control Signal Outputs 120 V ac to MALSR Control Unit

External Power Requirements 120 V ac, 60 Hz

Inputs 120 V ac 60 Hz from MALSR control cabinet

Power Outputs 24 V dc and 120 V ac to G/G receiver decoder

120 V ac to A/G receiver controller

1-7/1-8

1.5 EQUIPMENT AND ACCESSORIES SUPPLIED.- The equipment and

accessories supplied are listed in table 1-2.

Table 1-2. EQUIPMENT AND ACCESSORIES SUPPLIED

Quantity Nomenclature

FAA

Number Dimensions Weight and Volume

1 Remote Radio Control Interface Unit

FA-16100 Uncrated:

Height - 7.4 inches

(18.8 cm) Length - 20 in

(50.8 cm) Width - 16 in

(40.6 cm)

Uncrated:

Weight - 22 pounds

(10 kg) Volume - 2368.0 cu in

(38774 cc)

Crated:

Height - 9.5 in

(24.1 cm) Length - 22.8 in

(57.9 cm) Width - 17 in

(43.2 cm)

Crated:

Weight - 26 pounds

(11.8 kg) Volume - 3682.2 cu in

(60280 cc)

1.6 EQUIPMENT REQUIRED BUT NOT SUPPLIED.- There are no additional equipments required with the Remote Radio Control Interface Unit, Type FA-16100. This RRCIU will be attached to a lighting system that may have an RMS cabinet. See figure 2-1.

2-1

SECTION 2. TECHNICAL DESCRIPTION

2.1 SIMPLIFIED THEORY OF OPERATION.- The Remote Radio Control Interface Unit (RRCIU), Type FA-16100, provides the switching matrix to convert momentary dc pulses from the G/G receiver decoder into 120 V ac signals. The 120 V ac signals are then utilized by the Medium-Intensity Approach Lighting System with Runway Alignment Indicator Lights (MALSR) control circuits to actuate and control the approach lights and sequence flashers. In addition, the interface unit accepts 120 V ac signals from the A/G receiver decoder to actuate and control the approach lights when the A/G mode is selected.

2.1.1 Functional Circuits.- The functional circuits (see figure 2-1) within the interface unit operate from control inputs from the G/G receiver decoder and the A/G receiver controller. Control outputs are provided for the MALSR Control Unit. The A/G READY signal from the A/G controller modification kit is provided for the MALSR RMS cabinet.

2.1.1.1 G/G Receiver Decoder to RRCIU.- The RRCIU supplies 24 V dc to the G/G receiver decoder. This voltage is routed to normally open contacts on 8 relays within the unit. Whenever one of the relays is energized, its contacts close and the 24 V dc passes through and is sent back to the RRCIU as a control signal (check Remote Radio Control System technical instruction book for more information on the G/G receiver decoder). The G/G receiver decoder can send out 8 different control signals to the RRCIU.

NOTE

The G/G decoder must have non-latching relays installed if an RRCIU is to be used.

T I

Figure 2-1. FUNCTIONAL BLOCK DIAGRAM, INTERFACE UNIT

2-3

a. The inputs to the interface unit from the G/G receiver decoder are:

(1) G/G control, tower control

(2) A/G enable, aircraft control

(3) Low intensity

(4) Med intensity

(5) High intensity

(6) MALSR off

(7) FL. off cont. command

(8) FL. on cont. command

b. The outputs from the interface unit to the G/G receiver decoder are:

(1) 120 V ac power

(2) Neutral

(3) 24 V dc power

2.1.1.2 A/G Receiver Controller to RRCIU.– The three main inputs to the interface unit from the A/G receiver controller are at line potential (120 V ac) to indicate low, medium, and high intensity of the MALSR system. An additional input, A/G ready, comes from the A/G modification kit in the receiver controller. The A/G control is a slave to the G/G receiver controller through latching relays in the interface unit. All control outputs from the interface unit are at line potential (120 V ac).

a. The inputs to the interface unit from the A/G receiver controller are:

(1) Low intensity – MALSR

2-4

(2) Medium intensity – MALSR

(3) High intensity – MALSR

(4) A/G ready (K10-1)

b. Outputs from the interface unit to the A/G controller unit consist of the following:

(1) Neutral

(2) 120 V ac power

2.1.1.3 MALSR Control Unit to RRCIU.

a. The inputs to the interface unit from the MALSR control unit are:

(1) 120 V ac power

(2) Neutral

b. The outputs from the interface unit to the MALSR control unit are:

(1) Low intensity

(2) Med intensity

(3) High intensity

(4) Sequence flasher

2.1.1.4 MALSR RMS Cabinet to RRCIU.- There is one output from the interface unit to the MALSR RMS. The A/G ready signal, which comes from the A/G controller unit, is passed through the RRCIU and then on to the MALSR RMS.

2.1.2 Relays.– The RRCIU uses ten relays to select and direct the proper output signal to the MALSR in response to the input signals.

Three of the relays are non-latching with 120 V ac coils, the other seven are latching with dual 24 V dc coils.

2-5

2.1.2.1 Non-Latching Relays.- The non-latching relays, K1 through K3, operate from the 120 V ac control signals supplied by the A/G receiver. They are switched on when 120 V ac is applied across their coils and switched off when the voltage is removed.

2.1.2.2 Latching Relays.- The seven latching relays, K4 through K10, operate from the 24 V dc control signals supplied by the G/G decoder. These relays are two state relays. When a momentary 24 V dc pulse is applied to pin B (pin A grounded to power supply return) of the relay, the relay is switched on and remains in the on state until the relay is reset. The relay is reset by applying another 24 V dc pulse to pin 8 (pin 5 grounded).

NOTE

A momentary pulse for this equipment is defined as a pulse greater than 0.5 second but less than 2 seconds.

2.1.3 Power Supply.– The RRCIU cabinet incorporates an adjustable 24 V dc power supply to power the relays that control the various output functions of the unit. The power supply has a nominal input of 120 V ac. The power supply converts 120 V ac into 24 V dc. The 24 V dc is used to energize the coils of the RRCIU relays depending upon what relays are active in the G/G decoder. The 24 V dc power supply is rated at 1.0 amp.

2.2 DETAILED THEORY OF OPERATION.– See figure 11-1. The RRCIU uses steering diodes and a combination of 7 dual-coil latching relays and 3 single-coil non-latching relays to generate the appropriate signals for controlling a MALSR or other lighting system. The signals are generated in response to eleven possible commands from the G/G receiver decoder and A/G receiver controller.

2.2.1 Steering Diodes.- The steering diodes are required so that an input control signal does not appear on another input control line. The diodes prevent the possibility of a feedback path, which would cause undesired operation. Relays K4 through K10 have diodes associated with the switched and reset operation of the relays.

Sixteen diodes CR1 through CR16 direct the control signals to the proper relay for MALSR control.

2-6

2.2.2 Functional Descriptions.- The relays on the RRCIU printed circuit card form three separate functional groups. Relays K4 through K7 are latching relays that hold the state of the G/G control. Relays K4, K5, K6, and K7 are for flasher ON/OFF, high intensity, medium intensity, and low intensity respectively.

Relays K1 through K3 reflect the state of the A/G receiver. Relays K2 and K3 are for medium and high intensity, and K1 is for both low intensity and flasher ON. Relays K8 through K10 are used to control whether the RRCIU outputs come from the A/G relay group (K1-K3) or the G/G relay group (K4-K7). If the system is in A/G mode, K8-K10 will be in the RESET (normal) position. In G/G mode, the relays will be in the SET position. The functions of each of the relays are listed in table 2-1.

Table 2-1. RELAY FUNCTIONS

Relay Function

K1 Reflects state of A/G receiver low control

K2 Reflects state of A/G receiver medium control

K3 Reflects state of A/G receiver high control

K4 Holds state of G/G control flasher ON/OFF

K5 Holds state of G/G control high intensity

K6 Holds state of G/G control medium intensity

K7 Holds state of G/G control low intensity

K8 Controls whether FL output comes from K3 or K4

K9 Controls whether MALSLO output comes from K3 or K7 Controls whether MALSMED output comes from K2 or K6

K10 Controls whether MALSHI output comes from K1 or K5 Controls whether A/G ready signal from A/G receiver is sent to MALSR RMS.

2.2.2.1 Ground-to-Ground (G/G) Control Command.- The G/G control command is used to place the lighting system under the control of the G/G decoder. When a momentary 24 V dc pulse comes in at TB1-1, it passes through diode CR13 and energizes the primary coils of relays K8 (pin B), K9 (pin B), and K10 (pin B). This latches all three relays. In the LATCHED position, relays K8, K9, and K10 can pass 120 V ac control signals from relays K4 through K7 onto terminals 3, 4, 5, and 7 of TB2. The 120 V ac signals on these

2-7 terminals are the low intensity, medium intensity, high intensity, and flasher control signals for the lighting system. Because relays K4 through K7 are latching, the system will maintain the current G/G state, even when in A/G mode. When changing from A/G mode to G/G mode, the system will not output high intensity with flashers on, as with earlier RRCIU systems, instead it will reflect the current state of relays K4 through K7. When the system is in G/G mode, the connection between K10-1 and K10-7 will be open and the A/G ready signal will not be sent to the MALSR RMS.

2.2.2.2 Air-to-Ground (A/G) Enable Control Command.- The A/G

control command is used to place the lighting system under the control of the A/G receiver. The 24 V dc pulse comes in at TB1-2 and passes through diode CR12, energizing the reset coils of K8 (pin 8), K9 (pin 8), and K10 (pin 8). In the reset position, relays K8, K9, and K10 will pass 120 V ac control signals from relays K1 through K3 onto terminals 3, 4, 5, and 7 of TB2. When the system is in A/G mode, the connection between K10-1 and K10-7 is closed so that the MALSR RMS will receive the A/G ready signal from the A/G receiver.

2.2.2.3 Ground-to-Ground (G/G) Low Intensity Control Command.- The low intensity control command (LO) places the lighting system in low intensity. The 24 V dc pulse comes in at TB1-3 and passes through diodes CR11, CR15, and CR16. The signal from CR11 latches relay K7 (pin B), allowing 120 V ac to pass from K7-6 to K7-9. The output of K7-9 is connected to K9-6, so that if the system is in G/G mode, the 120 V ac signal will be output to the MALSR at TB2-3 (MALSLO). The signal from CR15 resets relay K6 (pin 8), which removes medium intensity. The signal from CR16 resets relay K5 (pin 8), which removes high intensity. The G/G low intensity command does not affect flasher control.

2.2.2.4 Ground-to-Ground (G/G) Medium Intensity Control Command.- The medium intensity control command (MED) places the lighting system in medium intensity. The 24 V dc pulse comes in at TB1-6 and passes through diodes CR8, CR9, and CR14. The signal from CR14 resets relay K5 (pin 8) and removes high intensity. The signals from CR8 and CR9 latch relays K6 (pin B) and K7 (pin B). If the system is in G/G mode, 120 V ac signals will pass from K6-9 and K7-9 through K9-4 and K9-6, and then will be output at TB2-3 (MALSLO) and TB2-4 (MALSMED). In medium intensity mode, the RRCIU sends both MALSLO and MALSMED to the MALSR.

2-8

2.2.2.5 Ground-to-Ground (G/G) High Intensity Control Command.- The high intensity control command (HI) places the lighting system in high intensity. The 24 V dc pulse comes in at TB1-4 and passes through diodes CR6, CR7, and CR10. The signals from CR6, CR7, and CR10 latch relays K5 (pin B), K6 (pin B), and K7 (pin B). If the system is in G/G mode, 120 V ac signals from K5-9, K6-9, and K7-9 will pass through K9-6, K9-4, and K10-6 and then will be output to the MALSR at TB2-3 (MALSLO), TB2-4 (MALSMED), and TB2-5 (MALSHI).

In high intensity mode, the RRCIU sends MALSLO, MALSMED, and MALSHI to the MALSR.

2.2.2.6 Ground-to-Ground (G/G) MALSR OFF Control Command.- The MALSR OFF control command turns off the approach lights in the lighting system. The 24 V dc pulse comes in at TB1-5 and passes through diodes CR3, CR4, and CR5. The signals from CR3, CR4, and CR5 reset relays K5 (pin 8), K6 (pin 8), and K7 (pin 8). This opens the connection between pins 6 and 9 of each relay and prevents the 120 V ac from passing through. If the system is in G/G mode, no 120 V ac signals will reach TB2-3 (MALSLO), TB2-4 (MALSMED), or TB2-5 (MALSHI) and so the MALSR will be off. The G/G MALSR OFF control command does not turn off the flashers.

2.2.2.7 Ground-to-Ground (G/G) Flasher On Control Command.- The flasher on control command turns the sequence flashers on. The 24 V dc pulse comes in at TB1-8 and passes through diode CR2 to latch relay K4 (pin B). The 120 V ac connected to K4-6 passes through K4-9 to K8-6. If the system is in G/G mode, K8-6 will be connected to K8-9 and the 120 V ac will pass through to TB2-7 (FL) turning on the MALSR flashers.

2.2.2.8 Ground-to-Ground (G/G) Flasher Off Control Command.- The flasher off control command turns off the sequence flashers. The 24 V dc pulse comes in at TB1-7 and passes through diode CR1 to reset relay K4 (pin 8). When K4 is reset, the connection between K4-6 and K4-9 will be open and no signal will be sent to relay K8 (pin 6). If the system is in G/G mode, the 120 V ac signal will not be present at TB2-7 and so the flashers will be off.

2.2.2.9 Air-to-Ground (A/G) Control Low Intensity.- The A/G low intensity control (LOCONT) places the lighting system in low intensity with the sequence flashers on. When the A/G receiver receives a low command from the pilot, it puts 120 V ac on TB1-10 of the RRCIU. The signal at TB1-10 energizes relay K3 (pin A), 2-9 which connects K3-7 to K3-4. Because K3-4 is tied to the 120 V ac power coming in at TB2-12, K3-7 will pass the signal onto relays K8 (pin 3) and K9 (pin 3). If the system is in A/G mode, K8-3 and K9-3 will be connected to K8-9 and K9-9. The 120 V ac signals from K8-9 and K9-9 will be output to the MALSR at TB2-7 (FL) and TB2-3

(MALSLO).

2.2.2.10 Air-to-Ground (A/G) Control Medium Intensity.- The A/G medium intensity control (MEDCONT) places the lighting system in medium intensity with the sequence flashers on. When the A/G receiver receives a medium command from the pilot, it first places 120 V ac on TB1-10 for low intensity (see paragraph 2.2.2.9), then places 120 V ac on TB1-11 for medium intensity. The signal at TB1-11 energizes relay K2 (pin A) and connects K2-7 and K2-4. If the system is in A/G mode, the 120 V ac will pass from K2-7 through K9-1 to K9-7 and then to the output at TB2-4.

2.2.2.11 Air-to-Ground (A/G) Control High Intensity.- The A/G high intensity control (HICONT) places the lighting system in high intensity with the sequence flashers on. When the A/G receiver receives a high command from the pilot, it first places 120 V ac on TB1-10 for low intensity (see paragraph 2.2.2.9), then places 120 V ac on TB1-11 for medium intensity (see paragraph 2.2.2.10), then places 120 V ac on TB1-12 for high intensity. The signal at TB1-12 energizes relay K1 (pin A) and connects K1-7 and K1-4. If the system is in A/G mode, the 120 V ac will pass from K1-7 through K10-3 to K10-9 and then to the output at TB2-5.

2.2.2.12 Test Pins.- The RRCIU incorporates a test connector (J1) and shorting jumper for limited testing of RRCIU functions. The connector has a pair of pins corresponding to each of the G/G decoder functions. One pin is connected to a G/G input line, while the other is connected to the 24 V dc line (V1). When the two pins are shorted together, 24 V dc will appear on the associated input control line, simulating G/G decoder operation. For example, placing the shorting jumper over the J1-3/J1-4 pair will cause 24 V dc to be present on the G/G line, placing the system in G/G mode.

The J1-1/J1-2 and J1-19/J1-20 pairs are unused. Table 2-2 contains the test connector functions.

2-10

NOTE

The G/G decoder connections (TB1-1 to TB1-9) must be removed before testing, or a feedback path may develop and disrupt operation. When not in use, the shorting jumper should be placed over the unused pins at either end of the connector. If the jumper remains on any other pair of pins, the RRCIU will not work correctly.

Table 2-2. TEST PINS

Test Connector Label

Jumper Pin Numbers (Not Labeled) Associated Function

G/G J1-3/J1-4 G/G Mode

A/G J1-5/J1-6 A/G Mode

LO J1-7/J1-8 MALS Low Intensity

HI J1-9/J1-10 MALS High Intensity

OFF J1-11/J1-12 MALS Off

MED J1-13/J1-14 MALS Medium Intensity

FL0 J1-15/J1-16 MALS Flasher OFF

FL1 J1-17/J1-18 MALS Flasher ON

2.2.2.13 Lightning Arresters.- Lightning arresters VR1 through VR17 are installed on the power inputs to the interface unit and control input leads from the A/G unit and G/G unit (see figure 11-1). The purpose of the lightning arresters is to shunt any transient voltages superimposed on the interface unit’s power input lines. VR1 through VR8 are rated at 175 V ac (RMS) and can withstand 6500 amps peak transient current. VR9 through VR17 are rated at 27 V dc max and can withstand 2000 amps peak transient current. The interface unit will automatically recover from any transients less than the peak values.

3-1/3-2

SECTION 3. OPERATION

3.1 INTRODUCTION.- The Remote Radio Control Interface Unit, Type FA-16100, is an automatically-controlled unit. Therefore, no prior operator experience is necessary.

3.2 CONTROLS AND INDICATORS.- There are no controls or indicators incorporated in the design of the interface unit.

3.3 OPERATING PROCEDURES.– There are no physical operating

procedures required to activate the interface unit. Startup and shutdown of the interface unit is controlled by radio signals received from the ground-to-ground receiver decoder or the air-to-ground receiver controller.

3.4 OPERATOR MAINTENANCE.– The interface unit requires no

operator maintenance actions or scheduled operator maintenance actions.

4-1/4-2

SECTION 4. STANDARDS AND TOLERANCES

4.1 GENERAL.- The standards, initial tolerance limits, and

operating tolerance limits are provided in table 4-1.

Table 4-1. STANDARDS AND TOLERANCES

Reference Tolerance Limit Parameter Paragraph Standard Initial Operating

AC Input Voltage

6.3.1a 120 V ac 108 V ac to 132 V ac

Same as initial

24 V dc Power Supply

6.3.1b 24 V dc 23.5 V dc to

24.5 V dc

Same as initial

A/G Operational ..

Check

6.3.1c thru e

120 V ac 108 V ac to 132 V ac

Same as initial

G/G Functional ...

Check

6.3.2a thru k

120 V ac 108 V ac to 132 V ac

Same as initial

5-1

SECTION 5. PERIODIC MAINTENANCE

5.1 GENERAL.- This section contains performance maintenance

checks and maintenance task schedules. It presents all maintenance activities that are to be performed on a recurring basis to ensure optimum performance, minimize service interruptions, and to avoid major breakdowns of the interface unit.

5.2 PERFORMANCE CHECKS.- Performance checks for the interface unit are provided in table 5-1.

Table 5-1. PERFORMANCE CHECKS

Reference Paragraph or Table

Performance Check Standards and Tolerances

Maintenance Procedures

INTERFACE UNIT

a. Monthly intervals are recommended

(1) Measure AC input ...

voltage

Table 4-1 6.3.1a

(2) Measure output voltage 24 V dc power supply

Table 4-1 6.3.1b

(3) Perform A/G operational checks

Table 4-1 6.3.1c thru e

b. Quarterly intervals are recommended

Perform functional check

Table 4-1 6.3.2a thru k

5-2

5.3 OTHER ONSITE MAINTENANCE TASKS.- Other maintenance tasks

which are necessary to prevent deterioration of the interface unit and which will ensure reliable operation are provided in table 5-2.

Table 5-2. OTHER MAINTENANCE TASKS

Reference Paragraph or Table

Other Maintenance Tasks Standards and Tolerances

Maintenance Procedures

Interface Unit

Monthly intervals are recommended

(1) Inspect interface unit for excessive dust/dirt, grease, etc.

6.3.3a

(2) Inspect cables and wires for physical damage, such as wearing or fraying.

6.3.3b

(3) Inspect for loose connections on terminal blocks Check relays in relay sockets for tightness.

6.3.3c

Power Supply

Adjust 24 V dc power supply Table 4-1 6.3.4

5.4 OFFSITE MAINTENANCE.- There are no offsite maintenance tasks to perform on the interface unit.

6-1

SECTION 6. MAINTENANCE PROCEDURES

6.1 GENERAL.- This section contains the maintenance procedures for accomplishing the various performance checks and maintenance tasks described in tables 5-1 and 5-2. Should a malfunction occur during the performance checks, refer to Section 7, Corrective Maintenance, and the troubleshooting support data in section 11.

6.2 TEST EQUIPMENT REQUIRED.- The test equipment required for proper maintenance of the interface unit are listed in table 6-1.

Table 6-1. TEST EQUIPMENT REQUIRED

Name Model No. Use

True RMS multimeter Fluke 87 or equivalent

Check dc voltages and ac voltages

Aircraft type transmitter

------------- Perform air-to-ground (A/G) operational test

6.3 PERFORMANCE CHECKS AND MAINTENANCE PROCEDURES.- These

periodic checks are performed to ensure that the interface unit functions as required in response to all input commands. Prior to performing performance checks, ensure that 120 V ac line voltage is provided at terminals 11 and 12 of terminal block TB2 (see figure 6-1 for location of TB2) in order to supply normal operating power to the interface unit.

6.3.1 Monthly Performance Checks.- The procedures for performing the monthly performance checks are described below. Refer to figure 6-1 for location of terminal blocks TB1 and TB2.

The interface unit contains both 120 V ac and 24 V dc voltages. Always observe proper safety precautions when cover is opened. Failure to comply may cause serious injury to personnel.

WARNING

6-2

Figure 6-1. PARTS LOCATION DIAGRAM, INTERFACE UNIT

K1-K10

TB3

PS1

TB1

TB2

W1

CR1-CR16

VR1-VR17

6-3

a. Connect ac voltmeter between terminals 1 and 2 of terminal block TB2. Observe voltage reading on ac voltmeter; ac input voltage should be as indicated in table 4-1.

b. Connect dc voltmeter to output of 24 V dc power supply PS1 with the positive lead to TB3-2 and the negative lead to TB3-1 (see figure 6-1 for location of TB3). The dc output voltage should be as indicated in table 4-1.

NOTE

An A/G enable control command must be issued, prior to commencement of tests.

To initiate changes in the intensity of the approach lights (low, medium, high), it is necessary to pulse the aircraft type transmitter as necessary. Performance checks may be completed using an ac voltmeter at specified points, or by physically observing the intensity changes of the approach lights.

c. For this A/G operational check, connect ac voltmeter to terminals 3 and 2 of terminal block TB2 (low intensity). Using an aircraft type transmitter, send pulsed radio signal to the A/G receiver controller unit. Observe voltage reading on ac voltmeter;

ac output voltages should be as indicated in table 4-1.

d. For this second A/G operational check, connect ac voltmeter to terminals 4 and 2 of terminal block TB2 (medium intensity).

Using an aircraft type transmitter, send pulsed radio signal to the A/G unit. Observe voltage reading on ac voltmeter; ac output voltage should be as indicated in table 4-1.

e. For this last A/G operational check, connect ac voltmeter to terminals 5 and 2 of terminal block TB2 (high intensity). Send pulsed radio signal to the A/G unit using aircraft type transmitter. Observe voltage reading on ac voltmeter; ac output voltage should be as indicated in table 4-1.

6-4

6.3.2 Quarterly Performance Checks.- The procedures for

conducting the functional performance checks are listed below in steps a through k. Refer to figure 6-1 for the location of terminal blocks TB1 and TB2.

NOTE

Before conducting the checks, have the control tower turn off the approach lights and sequence flashers. Also, verify that the A/G controller is off and remove all wires attached to TB1.

All jumpers specifically added in order to perform the checks shall be removed at the end of step k unless otherwise noted.

Step a, below, places the interface unit in the A/G mode, then steps b, c, and d simulate A/G commands. Step e places the interface unit in the ground-to-ground (G/G) mode. The remaining steps, e through k, simulate G/G commands. In order to make the momentary connections required for the G/G checks, the test connector J1 may be used instead of a jumper wire. See paragraph

2.2.2.12 for details.

The interface unit contains 120 V ac and 24 V dc voltages. Personnel are advised to remove the 120 V ac line voltage when adding or removing jumpers to the terminal blocks.

Failure to comply may cause serious injury to personnel.

a. Make momentary connection from TB1-2 to TB1-9 to simulate an A/G Enable command. Connect ac voltmeter as indicated below and ensure that voltage readings are as stated.

6-5

From To Voltage Reading Signal Monitored

TB2-3 TB2-2 0 Volt Low Intensity TB2-4 TB2-2 0 Volt Medium Intensity TB2-5 TB2-2 0 Volt High Intensity TB2-7 TB2-2 0 Volt Sequence Flasher

b. Connect jumper from TB1-10 to TB2-1 to simulate a LOCONT command. Connect ac voltmeter as indicated below and ensure that voltage readings are as stated.

From To Voltage Reading Signal Monitored

TB2-3 TB2-2 108 V ac to 132 V ac Low Intensity TB2-4 TB2-2 0 Volt Medium Intensity TB2-5 TB2-2 0 Volt High Intensity TB2-7 TB2-2 108 V ac to 132 V ac Sequence Flasher

c. Connect jumper from TB1-10 to TB1-11 to simulate a MEDCONT command. Connect ac voltmeter as indicated below and ensure that voltage readings are as stated.

From To Voltage Reading Signal Monitored

TB2-3 TB2-2 108 V ac to 132 V ac Low Intensity TB2-4 TB2-2 108 V ac to 132 V ac Medium Intensity TB2-5 TB2-2 0 Volt High Intensity TB2-7 TB2-2 108 V ac to 132 V ac Sequence Flasher

d. Connect jumper from TB1-11 to TB1-12 to simulate a HICONT command. Connect ac voltmeter as indicated below and ensure that voltage readings are as stated.

From To Voltage Reading Signal Monitored

TB2-3 TB2-2 108 V ac to 132 V ac Low Intensity TB2-4 TB2-2 108 V ac to 132 V ac Medium Intensity TB2-5 TB2-2 108 V ac to 132 V ac High Intensity TB2-7 TB2-2 108 V ac to 132 V ac Sequence Flasher

6-6

e. Remove the jumpers from TB1-11 to TB1-12, TB1-10 to TB1-11, and TB1-10 to TB2-1. Make momentary connection from TB1-1 to TB1-9 to simulate a G/G Control command. Connect ac voltmeter as indicated below and ensure that voltage readings are as stated.

From To Voltage Reading Signal Monitored

TB2-3 TB2-2 0 Volt Low Intensity TB2-4 TB2-2 0 Volt Medium Intensity TB2-5 TB2-2 0 Volt High Intensity TB2-7 TB2-2 0 Volt Sequence Flasher

f. Make momentary connection from TB1-3 to TB1-9 to simulate a LO command. Connect ac voltmeter as indicated below and ensure that voltage readings are as stated.

From To Voltage Reading Signal Monitored

TB2-3 TB2-2 108 V ac to 132 V ac Low Intensity TB2-4 TB2-2 0 Volt Medium Intensity TB2-5 TB2-2 0 Volt High Intensity TB2-7 TB2-2 0 Volt Sequence Flasher

g. Make momentary connection from TB1-4 to TB1-9 to simulate a HI command. Connect ac voltmeter as indicated below and ensure that voltage readings are as stated.

From To Voltage Reading Signal Monitored

TB2-3 TB2-2 108 V ac to 132 V ac Low Intensity TB2-4 TB2-2 108 V ac to 132 V ac Medium Intensity TB2-5 TB2-2 108 V ac to 132 V ac High Intensity TB2-7 TB2-2 0 Volt Sequence Flasher

h. Make momentary connection from TB1-5 to TB1-9 to simulate an OFF command. Connect ac voltmeter as indicated below and ensure that voltage readings are as stated.

6-7

From To Voltage Reading Signal Monitored

TB2-3 TB2-2 0 Volt Low Intensity TB2-4 TB2-2 0 Volt Medium Intensity TB2-5 TB2-2 0 Volt High Intensity TB2-7 TB2-2 0 Volt Sequence Flasher

i. Make momentary connection from TB1-6 to TB1-9 to simulate a MED command. Connect ac voltmeter as indicated below and ensure that voltage readings are as stated.

From To Voltage Reading Signal Monitored

TB2-3 TB2-2 108 V ac to 132 V ac Low Intensity TB2-4 TB2-2 108 V ac to 132 V ac Medium Intensity TB2-5 TB2-2 0 Volt High Intensity TB2-7 TB2-2 0 Volt Sequence Flasher

j. Make momentary connection from TB1-8 to TB1-9 to simulate an FL1 command. Connect ac voltmeter as indicated below and ensure that voltage readings are as stated.

From To Voltage Reading Signal Monitored

TB2-3 TB2-2 108 V ac to 132 V ac Low Intensity TB2-4 TB2-2 108 V ac to 132 V ac Medium Intensity TB2-5 TB2-2 0 Volt High Intensity TB2-7 TB2-2 108 V ac to 132 V ac Sequence Flasher

k. Make momentary connection from TB1-7 to TB1-9 to simulate an FL0 command. Connect ac voltmeter as indicated below and ensure that voltage readings are as stated.

From To Voltage Reading Signal Monitored

TB2-3 TB2-2 108 V ac to 132 V ac Low Intensity TB2-4 TB2-2 108 V ac to 132 V ac Medium Intensity TB2-5 TB2-2 0 Volt High Intensity TB2-7 TB2-2 0 Volt Sequence Flasher

6-8

6.3.3 Monthly Maintenance Tasks.- Perform the following

procedures for monthly maintenance tasks.

a. Remove dust/dirt and/or foreign matter by wiping interface unit with clean, dry, lint-free cloth. Dry compressed air at low pressure may be used to blow dust/dirt from hard-to-reach areas.

b. Replace or repair cables/wires that show any sign of physical damage such as wearing or fraying.

c. Tighten all loose connections on terminal blocks and secure relays in relay sockets as necessary.

6.3.4 Adjustment of Power Supply PS1. – To adjust power supply to comply with the standard operating voltage indicated in table 4-1, proceed as follows:

a. Connect dc voltmeter to output of 24 V dc power supply PS1 with the positive lead to TB3-2 and the negative lead to TB3-1 (see figure 6-1 for location of TB3).

b. Adjust the power supply voltage using the VOLT ADJ control located on the bottom of the power supply case. The voltage should be adjusted for a reading of 24 V dc �0.5 volts.

The interface unit contains 120 V ac and 24 V dc voltages. Personnel are advised to remove the 120 V ac line voltage before replacing components.

Failure to comply may cause serious injury to personnel.

6.3.5 Replacement of Assembly Components.- The procedures for the replacement of relays, diodes, or the power supply unit are given below. A parts location diagram for the interface unit is provided in figure 6-1 and a printed circuit board layout in figure 6-2.

6-9

CAUTION

Use a heat sink on diode leads and a soldering iron with a temperature between 550° and 800° F when soldering or unsoldering diodes. Failure to comply may cause damage to diode components.

a. Remove relays from relay sockets by simply lifting relay out of relay socket.

b. The removal and replacement of diodes shall be accomplished by using a low wattage soldering iron, a resin core solder, and a heat sink.

c. Remove dc power supply PS1 by removing the screws that mount the plate to the enclosure. Disconnect the leads from the power supply to TB3 and remove the screws securing the power supply to the mounting plate.

6-10

Figure 6-2. PRINTED CIRCUIT BOARD LAYOUT (SILKSCREEN)

(SHEET 1 OF 3)

6-11

(SHEET 2 OF 3)

6-12

(SHEET 3 OF 3)

7-1

SECTION 7. CORRECTIVE MAINTENANCE

7.1 GENERAL.- This section contains the necessary information to troubleshoot and localize defective components within the interface unit. To provide a systematic approach to fault analysis and identification, it is recommended that corrective maintenance actions be conducted in the following sequence.

a. Visually inspect interface unit for loose connections, physical damage, etc.

b. Check power supply operation and required input voltages.

c. Check related circuits.

d. Perform operational tests.

7.2 TROUBLESHOOTING.- If a malfunction or failure occurs during operation or during the performance of operational tests, refer to the procedures described in Table 7-1, Troubleshooting Chart.

Troubleshooting supporting data is provided in Figure 2-1, Functional Block Diagram, Interface Unit; Figure 11-1, Schematic Wiring Diagram, Interface Unit; Figure 6-1, Parts Location Diagram, Interface Unit.

NOTE

When performing troubleshooting on the interface unit, it is assumed that the G/G unit, the A/G unit, and the MALSR Control unit are in operational status.

7.3 TEST EQUIPMENT REQUIRED.- The test equipment required for performing corrective maintenance is described in table 6-1.

7-2

Table 7-1. TROUBLESHOOTING CHART

Trouble Probable Cause Remedy

Interface unit inoperative

No 120 V ac input voltage.

Check MALSR control unit.

Defective varistor(s) VR8 or

VR17.

Check varistors;

replace defective varistor(s).

No 24 V dc output. Check power supply

PS1.

G/G control command not functioning

Defective diode(s)

CR13.

Check diode; replace defective diode.

Defective varistor

VR9.

Check varistor;

replace defective varistor.

Three defective relay(s) K8, K9 and K10.

Check all three relays; replace if necessary.

A/G control command functioning

Defective diode

CR12.

Check diode; replace defective diode.

Defective varistor

VR10.

Check varistor;

replace defective varistor.

Three defective relay(s) K8, K9 and K10.

Check all three relays; replace if necessary.

G/G low intensity control command problems:

MALSLO is off (120 V ac not present at

TB2-3)

Defective diode(s) CR11, CR15 or CR16.

Check diode(s);

replace defective diode(s).

7-3

Table 7-1. TROUBLESHOOTING CHART (CONTINUED)

Trouble Probable Cause Remedy

Defective varistor(s) VR11 or

VR4.

Check varistors;

replace defective varistor(s).

Defective relay(s) K7 or K9.

Check relays; replace defective relay(s).

MALSMED is on (120 V ac is present at TB2-

4) but should be off.

Defective diode(s) CR11, CR15 or CR16.

Check diode(s);

replace defective diode(s).

Defective varistor

VR11.

Check varistor;

replace defective varistor.

Defective relay K6 or K9.

Check relay; replace defective relay(s).

MALSHI is on (120 V ac is present at TB2-

5) but should be off.

Defective diode(s) CR11, CR15 or CR16.

Check diode(s);

replace defective diode(s).

Defective varistor

VR11.

Check varistor;

replace defective varistor.

Defective relay(s) K5 or K10.

Check relays; replace defective relay(s).

G/G medium intensity control command problems:

MALSLO is off (120 V ac not present at

TB2-3)

Defective diode(s) CR8, CR9 or CR14.

Check diode(s);

replace defective diode(s).

Defective varistor(s) VR14 or

VR4.

Check varistors;

replace defective varistor(s).

Defective relay(s) K7 or K9.

Check relays; replace defective relay(s).

7-4

Table 7-1. TROUBLESHOOTING CHART (CONTINUED)

Trouble Probable Cause Remedy

MALSMED is off (120 V ac not present at

TB2-4)

Defective diode(s) CR8, CR9 or CR14.

Check diode(s);

replace defective diode(s).

Defective varistor(s) VR14 or

VR5.

Check varistors;

replace defective varistor(s).

Defective relay(s) K6 or K9.

Check relays; replace defective relay(s).

MALSHI is on (120 V ac is present at TB2-

5) but should be off

Defective diode(s) CR8, CR9 or CR14.

Check diode(s);

replace defective diode(s).

Defective varistor

VR14.

Check varistor;

replace defective varistor.

Defective relay(s) K5 or K10.

Check relays; replace defective relay(s).

G/G high intensity control command problems:

MALSLO is off (120 V ac not present at

TB2-3)

Defective diode(s) CR6, CR7 or CR10.

Check diode(s);

replace defective diode(s).

Defective varistor(s) VR12 or

VR4.

Check varistors;

replace defective varistor(s).

Defective relay(s) K7 or K9.

Check relays; replace defective relay(s).

MALSMED is off (120 V ac not present at

TB2-4)

Defective diode(s) CR6, CR7 or CR10.

Check diode(s);

replace defective diode(s).

7-5

Table 7-1. TROUBLESHOOTING CHART (CONTINUED)

Trouble Probable Cause Remedy

Defective varistor(s) VR12 or

VR5.

Check varistors;

replace defective varistor(s).

Defective relay(s) K6 or K9.

Check relays; replace defective relay(s).

MALSHI is off (120 V ac not present at

TB2-5)

Defective diode(s) CR6, CR7 or CR10.

Check diode(s);

replace defective diode(s).

Defective varistor(s) VR12 or

VR6.

Check varistors;

replace defective varistor(s).

Defective relay(s) K5 or K10.

Check relays; replace defective relay(s).

G/G MALSR off control command problems:

MALSLO is on (120 V ac is present at TB2-

3) but should be off

Defective diode(s) CR3, CR4 or CR5.

Check diode(s);

replace defective diode(s).

Defective varistor

VR13.

Check varistor;

replace defective varistor.

Defective relay(s) K7 or K9.

Check relays; replace defective relay(s).

MALSMED is on (120 V ac is present at TB2-

4) but should be off

Defective diode(s) CR3, CR4 or CR5.

Check diode(s);

replace defective diode(s).

Defective varistor

VR13.

Check varistor;

replace defective varistor.

Defective relay(s) K6 or K9.

7-6

Table 7-1. Troubleshooting Chart (Continued)

Trouble Probable Cause Remedy

MALSHI is on (120 V ac is present at TB2-

5) but should be off

Defective diode(s) CR3, CR4 or CR5.

Check diode(s);

replace defective diode(s).

Defective varistor

VR13.

Check varistor;

replace defective varistor.

Defective relay(s) K5 or K10.

Check relays; replace defective relay(s).

G/G flasher control commands (FL0 and FL1) problems:

FL is on (120 V ac is present at TB2-7) but should be off

Defective diode

CR1.

Replace defective diode.

Defective varistor

VR15.

Check varistor;

replace defective varistor.

Defective relay(s) K4 or K8.

Check relays; replace defective relay(s).

FL is off (120 V ac not present at TB2-7) but should be on

Defective diode

CR2.

Replace defective diode.

Defective varistor(s) VR16 or

VR7.

Check varistors;

replace defective varistor(s).

Defective relay(s) K4 or K8.

Check relays; replace defective relay(s).

A/G control problems:

A/G control Low intensity inoperative

Defective relay(s) K3 or K9.

7-7/7-8

Table 7-1. TROUBLESHOOTING CHART (CONTINUED)

Trouble Probable Cause Remedy

Defective varistor(s) VR1 or

VR4.

Check varistors;

replace defective varistor(s).

A/G Control Medium Intensity inoperative

Defective relay(s) K2 or K9.

Check relays; replace defective relay(s).

Defective varistor(s) VR2 or

VR5.

Check varistors;

replace defective varistor(s).

A/G Control High Intensity inoperative

Defective relay(s) K1 or K10.

Check relays; replace defective relay(s).

Defective varistor(s) VR3 or

VR6.

Check varistors;

replace defective varistor(s).

Flasher is off (120 V ac is not present at

TB2-7)

Defective relay(s) K3 or K8.

Check relays; replace defective relay(s).

Defective varistor(s) VR1 or

VR7.

Check varistor(s);

replace defective varistor(s).

8-1

SECTION 8. PARTS LIST

8.1 GENERAL.- This section contains the parts list for the

interface unit. Table 8-1 provides the reference designation, description, manufacturer’s code number, and part number for all replaceable components contained in the interface unit.

8.2 LIST OF MANUFACTURERS.- A list of manufacturer’s and their Federal Supply Codes is provided in table 8-2.

8-2

Table 8-1. PARTS LIST

Ref.

Desig.

Name of Part Description Mfrs.

Code No.

JAN/MIL

Mfrs. Part No. Notes

Remote Radio Control Interface Unit, Type

FA-16100

24937 AE-D-1457

A1 a Enclosure 00843 A-20H1606ALLP

A1A1 b Assembly, Electrical Interface

00843 A-20P16AL

A1A1A1 c PWB Assembly, Radio Remote Control

24937 AE-D-1457/1

A1A1A2PS1 c Power Supply, 24 V dc, 1 ampere

31281 OEM24N1-2 10290

A2 a Plate, Identification 24937 AE-D-1457/31

A3 a Plate, Electrical Diagram

24937 AE-D-1457/29

CR1

thru

CR16

d Diodes, 1 ampere, 1000 volt rating

14552 1N4007

K1 thru K3 d Relay, 120 V ac, 3 PDT, 1700 ohm coil

77342 KUP14A15120

K4 thru K10 d Relay, 24 V dc, Latching DPDT,472 ohm coil

77342 KUL11D15D24

TB1,

TB2

d 12 pin Block, Terminal, voltage rating 600 volts RMS, 25 amperes, .438

in. centers

13150 63512

TB3 d 4 pin Block, Terminal, voltage rating 600 volts RMS, 25 amperes, .438

in. centers

13150 63504

VR1

thru

VR8

d Transient/Surge Absorbers, 175 V ac max, 6500A surge current

54473 ERZ-V20D271

I n d e n t

8-3

Table 8-1. PARTS LIST

Ref.

Desig.

Name of Part Description Mfrs.

Code No.

JAN/MIL

Mfrs. Part No. Notes

VR9 thru

VR17

Transient/Surge Absorbers, 27 V dc max, 2000A surge current

54473 ERZ-V20D330

XK1

thru

XK10

d Socket, Relay 77342 27E046

Table 8-2. LIST OF MANUFACTURERS

Manufacturer's Code…