Attachment_3_DMWR_11-6610-401.pdf

DMWR 11-6610-401

DEPOT MAINTENANCE WORK REQUIREMENT

(INCLUDING DEPOT MAINTENANCE REPAIR

PARTS AND SPECIAL PARTS LIST)

VERTICAL SITUATION INDICATOR

ID-2277A/A

(NSN 6610-01-155-8315)

(P/N 129060)

THIS PUBLICATION IS NOT AVAILABLE THROUGH THE US ARMY

PUBLISHING AGENCY. THIS PUBLICATION IS AVAILABLE THROUGH

THE US ARMY COMMUNICATIONS-ELECTRONICS COMMAND.

NOTICE: REPRODUCTION FOR NON-MILITARY USE OF INFORMATION OR ILLUSTRATIONS CONTAINED

IN THIS PUBLICATION IS NOT PERMITTED WITHOUT SPECIFIC APPROVAL OF THE US ARMY

COMMUNICATIONS-ELECTRONICS COMMAND.

Distribution authorized to the Department of Defense and DOD contractors only to protect technical or operational information from automatic dissemination under the International Exchange Program or by other means. This protection applies to the publications required solely for official use and to those containing valuable technical or operational information. This determination was made on 3 February 1987. Other requests for this document will be referred to Commander, US Army Communications- Electronics Command and Fort Monmouth, ATTN: AMSEL-LC-LEO-E-ED, Fort Monmouth, New Jersey 07703-5006.

WARNING – This document contains technical data the export of which is restricted by the Arms Export Control Act (22 USC 2751 et seq.) or Executive Order 12470. Violations of these export laws are subject to severe criminal penalties.

DESTRUCTION NOTICE – Destroy by any method that will prevent disclosure of contents or reconstruction of the document.

US Army Communications- Electronics Command

Fort Monmouth, NJ

1 June 2002

FOR

CONTAINING NATIONAL MAINTENANCE REPAIR STANDARDS

ATTACHMENT 3:

RECOMMENDED CHANGES TO PUBLICATIONS AND

BLANK FORMS

For use of this form, see AR 25-30; the proponent agency is OAASA

Use Part II (reverse) for Repair Parts and Special Tool Lists (RPSTL) and Supply Catalogs/Supply Manuals (SCISM).

DATE

9 August 20 II TO: (Forward to proponent of publication or form) (Include ZIP Code) FROM: (Activity and location) (Include ZIP Code) COMMANDER US Army CECOM COMMANDER Tobyhanna Army Depot

ATTN: AMSEL-LC-LEO-D-CS-CFO ATTN: ELTY-ME-M

Fort Monmouth, NJ 07703-5006 II Hap Arnold Blvd.

Tobyhanna PA 18466-5075

PART I • ALL PUBLICATIONS (EXCEPT RPSTL AND SCISM) AND BLANK FORMS

PUBLICATION/FORM NUMBER

DMWR 11-6610-401

DATE

1 June 2002

TITLE

DMWR for Verticle Situation Indicator, -2277AIA, NSN 6610-01-155-8315.

ID

ITEM PAGE

NO.

PARA

GRAPH

LINE

NO.·

FIGURE

NO.

TABLE

NO.

RECOMMENDED CHANGES AND REASON

(provide exact wording of recommended changes, if possible).

l. 3-32 3-8 bod

TeChr [M~

OVAL

IC;aJ~ ~ttel1' ~

R

CPW

~DbmMI1f

Add additional test after Paragraph 3-8 d. Test Requirement: Compare the current required for minimum and maximum deflection of the Command Warning Flag (CMD) paragraph 3-8 b to the Navigation Warning Flag (NAV) paragraph 3-8 c and Glide Slope Warning Flag (G.S.) paragraph 3-8 d by switching between the "HDG FLAG" and "GS FLAG" on the "METER MOVEMENT" switchbank. Current measurements between the three shall be within 10 percent of each other.

Reason For Change: The DMWR test requirement applies successively higher voltage to the flag motor and monitors current required for minimum and maximum deflection. Unserviceable equipment returned to the depot with Quality Defficiency Report" inoperable flag" exibited "No· Indication of Failure" (NIOF) when tested by the DMWR. Root cause investigation determined that an unserviceable flag motor can be forced to operate by following the DMWR and still meet the minimum and maximum current requirements. The same voltage required to force the unserviceable motor to operate will cause a serviceable motor to draw excessive current. Applying appropriate voltage to one of the three flag motors to achieve the specified current and switching between the other two will identify an unserviceable motor because the current measurements will be more than 10 percent different ( greater than 10 percent when switching from unserviceable 'to serviceable and less than 10 percent when switching from serviceable to unserviceable).

6610-01-155-8315

ID-2277A1A

Control Number: DA0448

TYPED NAME, GRADE OR TITLE

Kenneth Stuccio Electronics Engineer

TELEPHONE EXCHANGEIAUTOVON.

PLUS EXTENSION

DSN 795-8921

SIGNATURE

DA FORM 2028, FEB 1974 REPLACES DA FORM 2028. 1 DEC 68, WHICH WILL BE USED, Page 1 of2 APD PE v4.01ES

TO: (Forward direct to addressee listed in publication) FROM: (Activity and location) (Include ZIP Code) DATE

PART 11- REPAIR PARTS AND SPECIAL TOOL LISTS AND SUPPLY CATALOGSISUPPLY MANUALS

PUBLICATION NUMBER DATE TITLE

PAGE

NO.

COLM

NO.

LINE

NO.

NATIONAL STOCK

NUMBER

REFERENCE

NO.

FIGURE

NO.

ITEM

NO.

TOTAL NO.

OF MAJOR

ITEMS

SUPPORTED

RECOMMENDED ACTION

PART III - REMARKS (Any general remarks or recommendations, or suggestions for improvement ofpublications and blank forms. Additional blank sheets may be used if more space is needed.)

TYPED NAME, GRADE OR TITLE TELEPHONE EXCHANGE/AUTOVON,

PLUS EXTENSION

SIGNATURE

Page 2 of 2DA FORM 2028, FEB 1974

SAFETY STEPS TO FOLLOW IF SOMEONE

IS THE VICTIM OF ELECTRICAL SHOCK

DO NOT TRY TO PULL OR GRAB THE INDIVIDUAL

IF POSSIBLE, TURN OFF THE ELECTRICAL POWER

IF YOU CANNOT TURN OFF THE ELECTRICAL POWER, PULL,

PUSH, OR LIFT THE PERSON TO SAFETY

USING A WOODEN POLE OR A DRY ROPE OR SOME OTHER

INSULATING MATERIAL

SEND FOR HELP AS SOON AS POSSIBLE

AFTER THE INJURED PERSON IS FREE OF CONTACT WITH

THE SOURCE OF ELECTRICAL SHOCK, MOVE

THE PERSON A SHORT DISTANCE AWAY AND IMMEDIATELY

START ARTIFICIAL RESPIRATION AND RESUSCITATION

a

WARNING

DANGEROUS CHEMICALS are used during cleaning processes performed on this equipment. FIRE, POISONING, AND/OR FLESH BURNS may result if personnel fail to observe safety precautions.

WARNING

Be careful when working with 115-volt power connections. DEATH ON CONTACT may result if personnel fail to observe safety precautions.

WARNING

Electrical shock hazard may exist between equipment not connected by a common ground. Be sure to connect common grounds to test instrument and test equipment to power source ground before applying power to avoid possible serious injury to personnel.

WARNING

TRICHLOROTRIFLUOROETHANE, TRICHLOROETHANE and similar chemical solvents will no longer be used for ordinary cleaning of equipment. These substances threaten public health and the environment by destroying ozone in the earth’s upper atmosphere. Suitable nonhazardous cleaning materials will be used instead, such as a clean cloth, water and mild detergent.

WARNING

A periodic review of safety precautions in TB 385-4, Safety Precautions for Maintenance of Electrical/Electronic Equipment, is recommended. When the equipment is operated with case removed, DO NOT TOUCH exposed connections or components. MAKE CERTAIN you are not grounded when making connections or adjusting components inside the test instrument.

WARNING

DO NOT SERVICE OR ADJUST ALONE

Do not attempt internal service or adjustment unless another person, capable of rendering first aid and resuscitation, is present.

WARNING

Compressed air is dangerous and can cause serious bodily harm if protective means or methods are observed to prevent a chip or particle (of whatever size) from being blown into the eyes or unbroken skin of the operator or other personnel. Compressed air shall not be used for cleaning purposes except where reduced to less than 30 pounds per square inch gauge (30 psig) and then only with effective chip guarding and personnel protective equipment (industrial safety glasses and full faceshield).

b c

CAUTION

Circuit card assemblies and integrated circuits cannot be cleaned with an ultrasonic cleaner. Failure to observe this caution may result in damage to components.

CAUTION

ESD SENSITIVE ITEM

HANDLE IN ACCORDANCE WITH

DOD-STD-1686 AND DOD-HDBK-263

d

FIRST AID PROCEDURES FOR ELECTRIC SHOCK VICTIMS

Before touching a victim of electrical shock, the circuit should be deenergized or the victim freed from the live conductor by using some suitable nonconductive object, such as rope, dry wooden stick, or insulated pole. Artificial resuscitation procedures appropriate to the victim's condition will be started immediately:

a. If the victim has stopped breathing, or the victim's heart has stopped beating; emergency first aid procedures should be started at once. If the victim is not breathing, do the following.

(1) Place victim on his/her back on a firm surface such as the floor or ground, not on a bed or sofa.

(2) Tilt the head straight back. Extend the neck up as far as possible. (This procedure will automatically keep the victim's tongue out of the airway).

(3) Open your mouth wide and place it tightly over the victim's mouth. At the same time, pinch the victim's nostrils shut, or close the nostrils with your cheek, or close the victim's mouth and place your mouth over the victim's nose. For babies and small children, cover both the mouth and the nose of the victim with your mouth.

(4) Blow into the victim's mouth, or nose, with a smooth steady action until the victim's chest raises.

(5) Remove your mouth. Allow the victim to exhale passively and watch the victim's chest fall.

(6) Repeat. This cycle should be continued at the rate of one breath each five seconds.

NOTE

If you are not getting an air exchange, quickly recheck position of head and adequacy of seal around victim's mouth. If attempts to ventilate are still unsuccessful, sweep fingers through victim's mouth and into throat to remove any foreign bodies. If the rescuer is unable to dislodge any foreign body, turn the victim on the side and give several sharp blows between the shoulder blades to jar it free. After four quick breaths, stop and determine if the heart is beating by gently feeling the carotid pulse. If the heart is beating, return to mouth-to-mouth resuscitation and continue until breathing starts or until a physician tells you to stop.

b. If the carotid pulse is absent or questionable, start artificial circulation by external cardiac compression.

(1) Place the heel of one hand on the lower one half of the breastbone and the other hand on top of the first.

(2) Thrust downward from your shoulders with enough force to depress the breastbone about 1-1/2 to 2 inches.

(3) Relax immediately after each downstroke to permit natural expansion of the chest.

(4) Repeat compressions at the rate of about one per second. The compressions must be regular, smooth, and uninterrupted. If you are alone with the victim, you must alternate mouth-to-mouth breathing with external cardiac compression at the ratio of about 2 to 15 (two breaths, then 15 heart compressions). If you have help, the ratio is five compressions to one inflation; therefore, after five heart compressions, CALL FOR HELP. Continue one or both of the above while the victim is being transported to the hospital until revival, or until told to stop by a physician.

e/(f Blank)

c. Once the victim is breathing again, watch carefully for signs of physical shock. Physical shock is a state of collapse or prostration that interferes with normal action of the nervous system; symptoms include weak pulse, chills, nausea, and a pale face. To treat shock:

(1) Have the patient lie down, with the head lower than the feet, if possible.

(2) Loosen tight clothing.

(3) See that the patient has plenty of air.

(4) Wrap the patient in blankets or other coverings as soon as possible. Keep the patient warm as is comfortable until help arrives.

PRINCIPLES OF CORROSIVE CHEMICAL FIRST-AID

1. In the event of contact with the eyes, immediately flush the eyes with water and continue to flush for 15 minutes.

The first few seconds after contact are critical and immediate flushing of the eyes may prevent permanent damage.

Any eyewash fountain is preferred, however, an eyewash hose of any other source of water should be used in an emergency.

Alkali (base) burns are usually more serious than acid burns.

2. Strong chemicals burn the skin rapidly. There is no time to waste. Begin flushing the area with water immediately.

Remove and discard clothing, including socks and shoes (obtain other clothes and shoes). Continue to flood the area, while clothing is being removed.

3. The precautionary warning on the product label should be consulted for full first-aid information. Provide the label information to the attending physician.

4. Neutralizers and solvents (alcohol, etc.) should not be used by the first aider. The spread of skin-absorbing corrosive poison, like phenol, can result in death. (Do not depend upon spilled chemicals to evaporate from your clothes).

A/B(Blank)

LIST OF EFFECTIVE PAGES

Insert latest change pages; dispose of superseded pages in accordance with applicable policies.

NOTE: On a change page, the portion of the text affected by the latest change is indicated by a vertical line in the outer margin of the page. Changes to illustrations are indicated by a vertical line in the margin next to the figure title.

Dates of issue of original and changed pages are:

Original 0 . . . . . . . . . . . . . . . . . 1 June 2002

The total number of pages in this DMWR is 187, consisting of the following:

Page *Change Page *Change Page *Change No. No. No. No. No. No.

Title……………….. 0 Figure B-2 (3 of 3) 0 B-11-1……………. 0 Blank..…………… 0 B-2-1 – B-2-2…. 0 Blank……………… 0 A…………………. 0 Figure B-3 (1 of 2) 0 Figure B-12 (1 of 4) 0 B Blank………….. 0 Figure B-3 (2 of 2) 0 Figure B-12 (2 of 4) 0 a – e……………… 0 B-3-1.………..…… 0 Figure B-12 (3 of 4) 0 i – iv……………… 0 Figure B-4……….. 0 Figure B-12 (4 of 4) 0 1-1 – 1-5………… 0 B-4-1……………… 0 Figure B-14 (1 of 3) 0 1-6 Blank………… 0 Figure B-5……….. 0 B-12-1 – B-12-2…. 0 2-1 – 2-4………. 0 B-5-1……………… 0 Blank………………. 0 3-1 – 3-2…… 0 Blank……………… 0 Figure B-13……….. 0 3-3………………… 0 Figure B-6 (1 of 2) 0 B-13-1…………….. 0 3-4 – 3-15………. 0 Figure B-6 (2 of 2) 0 Figure B-14……….. 0 3-16 – 3-79…….. 0 B-6-1……………… 0 B-14-1…………….. 0 3-80 Blank……… 0 Figure B-7……….. 0 Blank………………. 0 4-1 – 4-5………… 0 B-7-1……………… 0 B-I-1 – B-I-8………. 0 4-6 Blank………… 0 Blank……………… 0 C-1 – C-4…………. 0 5-1 – 5-2………… 0 Figure B-8 (1 of 2) 0 Index 1 – Index 7… 0 6-1 – 6-2………… 0 Figure B-8 (2 of 2) 0 Index 8 Blank……… 0

A-1 – A-2……….. 0 B-8-1……………… 0 FO-1……………… 0

B-1 – B-7………… 0 Figure B-9……….. 0 FO-2 Blank……… 0 Figure B-1……….. 0 B-9-1……………… 0 FO-3……………… 0 B-1-1……………… 0 Figure B-10……… 0 FO-4 Blank………. 0 Figure B-2 (1 of 3) 0 B-10-1……………. 0 FO-5……………… 0 Figure B-2 (2 of 3) 0 Figure B-11……… 0 FO-6 Blank……… 0

* Zero in this column indicates an original page.

* DMWR 11-6610-401

i

Depot Maintenance US ARMY COMMUNICATIONS- Work Requirement ELECTRONICS COMMAND

FORT MONMOUTH, NJ

No. 11-6610-401 Washington, DC, 1 June 2002

DEPOT MAINTENANCE WORK REQUIREMENT

VERTICAL SITUATION INDICATOR

ID-2277A/A

(NSN 6610-01-155-8315)

(PN 129060)

TABLE OF CONTENTS

Page

CHAPTER 1. INTRODUCTION ............................................................................................................ 1-1

Section I. General.............................................................................................................................. 1-1 1-1. Scope ................................................................................................................................ 1-1 1-2. Maintenance Forms, Records, and Reports ...................................................................... 1-1 1-3. Reporting Equipment Improvement Recommendations (EIR)........................................ 1-1

Section II. Description Dataplates and Tabulated Data...................................................................... 1-1 1-4. Description........................................................................................................................ 1-1 1-5. Data Plates ........................................................................................................................ 1-4 1-6. Tabulated Data.................................................................................................................. 1-4

* This manual supersedes DMWR 11-6610-401, dated 16 October 1986.

REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS

You can help improve this manual. If you find any mistakes, or if you know of a way to improve the procedures, please let us know. Mail your letter, DA Form 2028 (Recommended Changes to Publications and Blank Forms) or DA Form 2028-2 located in back of this manual direct to: Commander, US Army Communications- Electronics Command and Fort Monmouth, ATTN: AMSEL-LC-LEO-D-CS-CFO, Fort Monmouth, New Jersey 07703-5006. The fax number is 732-532-1413, DSN 992-1413. You may also e-mail your recommendations to AMSEL-LC-LEO-PUBS-CHG@mail1.monmouth.army.mil

In either case, a reply will be furnished directly to you.

(INCLUDING DEPOT MAINTENANCE REPAIR PARTS

AND SPECIAL TOOLS LIST)

CONTAINING NATIONAL MAINTENANCE REPAIR STANDARDS FOR

ii

TABLE OF CONTENTS - Continued

Page

CHAPTER 2. REQUIREMENTS............................................................................................................ 2-1

Section I. General.............................................................................................................................. 2-1 2-1. Facilities............................................................................................................................ 2-1 2-2. Support Items .................................................................................................................... 2-1

Section II. Standards........................................................................................................................... 2-4 2-3. Quality of Materials .......................................................................................................... 2-4 2-4. Wear Limits ...................................................................................................................... 2-4 2-5. Repair Parts....................................................................................................................... 2-4

CHAPTER 3. MAINTENANCE, OVERHAUL, AND REPAIR............................................................ 3-1

Section I. General.............................................................................................................................. 3-1 3-1. General.............................................................................................................................. 3-1

Section II. Safety ................................................................................................................................ 3-1 3-2. Safety Precautions............................................................................................................. 3-1

Section III. Preshop Analysis............................................................................................................... 3-1 3-3. Preshop Analysis............................................................................................................... 3-1 3-4. Testing of VSI................................................................................................................... 3-2 3-5. Test Setup Using TE 121880-3 ......................................................................................... 3-3 3-6. Operational Tests Using TE 121880-3.............................................................................. 3-4 3-7. Test Setup Using MIT-234C............................................................................................. 3-29 3-8. Operational Tests Using MIT-234C.................................................................................. 3-31

Section IV. Disassembly ...................................................................................................................... 3-47 3-9. Disassembly ...................................................................................................................... 3-47 3-10. Disassembly Procedures ................................................................................................... 3-48

Section V. Cleaning ............................................................................................................................ 3-67 3-11. Cleaning ............................................................................................................................ 3-67 3-12. Cleaning Procedures ......................................................................................................... 3-67

Section VI. Inspection and Repair........................................................................................................ 3-68 3-13. Inspection and Repair........................................................................................................ 3-68 3-14. Inspection of Components ................................................................................................ 3-68 3-15. Repair................................................................................................................................ 3-68

Section VII. Assembly .......................................................................................................................... 3-71 3-16. Assembly .......................................................................................................................... 3-71 3-17. General Assembly Instructions ......................................................................................... 3-71 3-18. Assembly Procedures........................................................................................................ 3-71 3-19. Testing and Alignment...................................................................................................... 3-78 3-20. Painting, Refinishing, and Marking .................................................................................. 3-79 iii

TABLE OF CONTENTS - Continued

Page

CHAPTER 4. FINAL ASSEMBLY AND TESTING ............................................................................. 4-1

Section I. General.............................................................................................................................. 4-1 4-1. General.............................................................................................................................. 4-1

Section II. Final Assembly and Testing ............................................................................................. 4-1 4-2. Final Assembly and Testing ............................................................................................. 4-1

Section III. Sealing, Filling and Leak Checking.................................................................................. 4-3 4-3. Sealing, Filling, and Leak Checking................................................................................. 4-3 4-4. Alternate Leak Test/Backfill Procedure............................................................................ 4-4 4-5. Final Performance Check.................................................................................................. 4-5

CHAPTER 5. QUALITY ASSURANCE/QUALITY CONTROL (QA/QC) REQUIREMENTS.......... 5-1

Section I. General.............................................................................................................................. 5-1 5-1. Responsibility for Inspection ............................................................................................ 5-1 5-2. Terms and Definitions ...................................................................................................... 5-1 5-3. Inspection and Test Equipment......................................................................................... 5-1 5-4. Certification of Personnel, Materials and Processes ......................................................... 5-1 5-5. Quality Assurance Plan..................................................................................................... 5-1

Section II. Inspection Requirements................................................................................................... 5-2 5-6. First Article Inspection ..................................................................................................... 5-2 5-7. Acceptance Inspection ...................................................................................................... 5-2

CHAPTER 6. PACKAGING, PACKING AND SHIPPING................................................................... 6-1

6-1. Packaging Requirements for VSI Storage ........................................................................ 6-1 6-2. Packaging Requirements for VSI Shipping ...................................................................... 6-1

APPENDIX A REFERENCES ................................................................................................................. A-1

APPENDIX B DEPOT MAINTENANCE REPAIRS PARTS AND

SPECIAL TOOLS LIST ............................................................................................. B-1

APPENDIX C EXPENDABLE SUPPLIES AND MATERIALS LIST.................................................. C-1

INDEX .......................................................................................................................................... Index 1 iv

LIST OF ILLUSTRATIONS

Figure Title Page

1-1. Vertical Situation Indicator .................................................................................................................... 1-1 1-2. Vertical Situation Indicator .................................................................................................................... 1-2 1-3. Identification Plate ................................................................................................................................. 1-5 2-1. VSI Test Console ................................................................................................................................... 2-2 2-2. Adapter Assembly/Cables...................................................................................................................... 2-3 2-3. VSI Overlay ........................................................................................................................................... 2-4 3-1. VSI Test Setup Using TE 121880-3....................................................................................................... 3-3 3-1A. VSI Test Setup Using MIT-234C .......................................................................................................... 3-31 3-2. Vertical Situation Indicator (Exploded View)........................................................................................ 3-50 3-3. Internal Mechanism Assembly............................................................................................................... 3-53 3-4. Forward Mechanism Assembly.............................................................................................................. 3-55 3-5. Roll Servomechanism Assembly ........................................................................................................... 3-58 3-6. Switching Circuit Card Assembly.......................................................................................................... 3-59 3-7. Power Supply and Servo Amplifier Circuit Card Assembly.................................................................. 3-61 3-8. Dial Mask Assembly.............................................................................................................................. 3-64 3-9. Pitch Servomechanism Assembly .......................................................................................................... 3-65 6-1. VSI Packaging Data ............................................................................................................................... 6-2 FO-1. Connection Diagram .............................................................................................................................. FO-1 FO-2. Switching Circuit Card Assembly Schematic Diagram ......................................................................... FO-3 FO-3. Power Supply and Servo Amplifier, Schematic Diagram...................................................................... FO-5

LIST OF TABLES

Number Title Page

1-1. Tabulated Data ....................................................................................................................................... 1-5 2-1. Inspection and Test Equipment.............................................................................................................. 2-1 3-1. Pitch Follow-up Accuracy...................................................................................................................... 3-8 3-2. Roll Follow-up Accuracy....................................................................................................................... 3-14 3-3. Troubleshooting Chart ........................................................................................................................... 3-23 3-4. Pitch Accuracy ....................................................................................................................................... 3-34 3-5. Roll Accuracy ........................................................................................................................................ 3-35 3-6. Troubleshooting Chart ........................................................................................................................... 3-42 3-7. Inspection Requirements........................................................................................................................ 3-69 3-8. Paint Requirements ................................................................................................................................ 3-70 5-1. Verification Testing ............................................................................................................................... 5-2

1-1

CHAPTER 1

INTRODUCTION

SECTION I - INTRODUCTION

1-1. SCOPE.

These instructions are for use by depot/contractor personnel. They apply to Vertical Situation Indicator ID-2277A/A (VSI) manufactured by Astronautics Corporation of America, Milwaukee, Wisconsin (CAGE 10138) as their part number 129060, and in case of conflict, take precedence over all other documents pertinent to its overhaul and inspection.

1-2. MAINTENANCE FORMS, RECORDS AND REPORTS.

a. Reports of Maintenance and Unsatisfactory Equipment. Department of the Army forms and procedures used for equipment maintenance will be those prescribed by DA Pam 738-750, as contained in Maintenance Management Update.

b. Report of Packaging and Handling Deficiencies. Fill out and forward SF 364 (Report of Discrepancy(ROD)) as prescribed in AR 735-11-2.

c. Discrepancy in Shipment Report (DISREP)(SF 361). Fill out and forward Discrepancy in Shipment Report (DISREP) (SF 361) as prescribed in AR 55-38.

d. Consolidated Index of Army Publications and Blank Forms. Refer to the latest issue of DA Pam 25-30 to determine whether there are new editions, changes or additional publications pertaining to the equipment.

1-3. REPORTING EQUIPMENT IMPROVEMENT RECOMMENDATIONS (EIR).

If your equipment needs improvement, let us know. Send us an EIR. You, the user, are the only one who can tell us what you don’t like about the design. Put it on an SF 368 (Quality Deficiency Report). Mail it to Commander, U.S. Army Communications-Electronics Command, ATTN: AMSEL-LC-LEO-D-CS-CFO, Fort Monmouth, NJ 07703-5006.

We’ll send you a reply.

SECTION II - DESCRIPTION, DATAPLATES AND TABULATED DATA

1-4. DESCRIPTION.

The VSI (figure 1-1) is an hermetically sealed, panel-mounted aircraft instrument designed to provide from remote inputs the following information on a single display:

NOTE

For VSI display nomenclature, 1-4.a. through 1-4.cc., refer to figure 1-2.

Figure 1-1. Vertical Situation Indicator

1-2

Figure 1-2. Vertical Situation Indicator Display

1-3

a. Marker Beacon Light. Light part of Lighting Panel, RH, removed by MWO 55-1520-237-50-20.

b. Pitch Scale. The pitch scale, in conjunction with the wings of the aircraft symbol, indicates the pitch of the aircraft, nose up or down in 5 degree increments from 0 to 80 degrees.

c. Attitude Warning Flag. The appearance of attitude warning flag indicates that pitch and roll data displayed is not reliable.

d. Glide Slope Pointer. The glide slope pointer moves up or down the glide slope scale and indicates the location of the aircraft relative to the centerline of the glide slope beam. When the pointer is displaced from the index on the glide slope scale, the aircraft must be "flown toward" the pointer to return to the centerline of the glide slope.

e. Glide Slope Scale. The glide slope scale, in conjunction with the glide slope pointer, indicates the number of degrees the aircraft is above or below the centerline of the glide slope beam.

f. Horizontal Steering Pointer. The horizontal steering pointer moves above and below the aircraft symbol. The aircraft is "flown toward" the pointer to satisfy the pitch change requirement.

g. Aircraft Symbol. The aircraft symbol is the fixed reference symbolizing the aircraft. Pitch and roll attitude are symbolizing the aircraft. Pitch and roll attitude are interpreted by the relative relationship of the attitude spheroid to the symbol.

h. Glide Slope Index. Alignment of the glide slope index and glide slope pointer indicates the aircraft is on the centerline of the glide slope beam.

i. Glide Slope Warning Flag. The appearance of the glide slope warning flag indicates that glide slope data displayed is not reliable.

j. Attitude Spheroid. The attitude spheroid moves with respect to the aircraft symbol wings to provide pitch data, and with respect to the roll scale index to provide roll data.

k. Pitch Trim Knob. The pitch trim knob is used to position the attitude spheroid relative to the aircraft symbol.

l. Localizer Scale. The localizer scale in conjunction with the localizer pointer indicates the position of the aircraft relative to the center of the localizer beam.

m. Localizer Pointer. The localizer pointer moves along the localizer scale and indicates the location of the aircraft relative to the centerline of the localizer. When the pointer is displaced from the index on the localizer scale, the aircraft is "flown toward" the pointer to return to the centerline of the localizer beam.

n. Rate of Turn Pointer. The rate of turn pointer moves along the rate of turn scale in the direction of the aircrafts coordinated turn. The rate of the coordinated turn in degrees/second is read on the rate of turn scale.

o. Skid Indicator. The skid indicator is used to assist in maintaining coordinated flight and is displaced from center when flight is not coordinated.

p. Rate of Turn Scale. The rate of turn scale, in conjunction with the rate of turn pointer, indicates the rate of turn of the aircraft in degrees per second.

q. Roll Trim Knob. The roll trim knob is used to position the attitude spheroid relative to the roll scale index.

r. Localizer Index. Alignment of the localizer index and localizer pointer indicates the aircraft is on the centerline of the localizer beam.

s. Navigation Warning Flag. The appearance of the navigation warning flag indicates that navigational data displayed is not reliable.

1-4

t. Vertical Steering Pointer. The vertical steering pointer moves to the right and left of the center of the aircraft symbol. The aircraft is "flown toward" the point to satisfy the roll change requirement.

u. Collective Command Pointer. The collective command pointer moves up and down the collective command scale to indicate a required change in collective pitch.

v. Collective Command Scale. The collective command scale, in conjunction with the collective command pointer indicates the magnitude of the required collective pitch change. If the pointer is above the center of the index, collective pitch must be decreased.

w. Horizon Index. The go around light illuminates when the go around mode is selected.

x. Command Warning Flag. The appearance of the command warning flag indicates that horizontal and vertical steering data and collective command data displayed is not reliable.

y. Go Around Light. Light part of Lighting Panel, LH, removed by MWO 55-1520-237-50-20.

z. Roll Scale. The roll scale, in conjunction with the roll scale pointer indicates the roll attitude of the aircraft in degrees.

aa. Roll Scale Pointer. The roll scale pointer moves along the roll scale and indicates the roll attitude of the aircraft, left or right.

bb. Decision Height Light. Light part of Lighting Panel, LH, removed by MWO 55-1520-237-50-20.

cc. Roll Scale Index. A zero roll condition exists when the index is aligned with the roll pointer.

1-5. DATA PLATES.

An equipment data plate will be attached to the indicator to provide a convenient record of when the indicator has been overhauled or modified.

a. Data Plate Source. Locally manufacture a data plate with pressure tape, Federal Specification L-T-80. The tape will be cut to the size needed.

b. Data Plate Replacement. When sufficient space is not available to add information, the plate will be replaced and all pertinent data transferred to the new data plate. Data will not be stamped directly on any part, assembly, or an item of equipment.

1-6. TABULATED DATA.

The electrical requirements, physical dimensions and other leading particulars are given in table 1-1.

1-5/(1-6 blank)

Figure 1-3. Identification Plate

Table 1-1. Tabulated Data

Operating Power Input ........................................................... 115 VAC, 400 Hz

Lighting Power Input ............................................................. 5 VAC, 400 Hz

Overall Physical Dimensions:

Length (including knobs and connector)......................... 9.477 in. max.

Width............................................................................... 5.010 in. max.

Height.............................................................................. 5.260 in. max.

Mounting Hole Spacing:

Horizontal........................................................................ 4.505 in. max.

Vertical............................................................................ 4.755 in. max.

Weight .................................................................................... 5.9 lbs. Max.

Operating Ambient Temperature............................................ -54˚C to 71˚C

Filling and Sealing Requirements:

Filling and Medium......................................................... Mixture of 90% nitrogen and 10% helium, 98% pure (min.) free of dust and containing not more than

0.006 milligrams per liter of water vapor (dew point -65˚C) at 1 atmosphere pressure differential.

Leak Rate ........................................................................ Not to exceed 5.00 x 10-5 std cc per second at a pressure differential of 1 atmosphere.

Electrical Connector ............................................................... MS3443H20C41P

Mates with.............................................................................. MS3476L20-41S

2-1

CHAPTER 2

REQUIREMENTS

SECTION I - GENERAL

2-1. FACILITIES.

Special facilities are not required for depot maintenance of the indicator. However, disassembly, assembly and testing will be accomplished in a controlled environmental area. A controlled environmental area is defined as a workspace requiring better than normal housekeeping and segregated from excessive dirt generating conditions. The temperature should be maintained at 77 (+18)˚F with a relative humidity of 90 percent maximum, under normal atmospheric pressure of 28 to 31 inches Hg. Normally, good commercial air conditioning equipment will meet the above requirements. The workspace will be free of vibration. The primary power requirements are 115 (+1.0) vac and 5 vac variable, 400 (+5.0) Hz, single phase.

The advisory light power requirement is 27.5 (+0.5) vdc.

2-2. SUPPORT ITEMS.

The following items are required to support depot maintenance:

a. Special Tools and Equipment. Special tools and equipment are not required for depot maintenance of the VSI.

b. Inspection and Test Equipment. Inspection and test equipment required for depot maintenance of the VSI are listed in Table 2-1.

Table 2-1. Inspection and Test Equipment

Nomenclature NSN or part number Paragraph of use

Vertical Situation Indicator (VSI) Test Console (fig. 2-1) or equivalent

ACA PN TE121880-3 3-5.a.

Adapter Assembly and Cables (fig. 2-2) or Equivalent ACA PN TE133267 3-5.b.

Vertical Situation Overlay (fig. 2-3) or Equivalent ACA PN TE133508 3-6.y.(7)

Test Set MIT-234C PN 234000-003 4920-01-476-2628

3-7 3-8

Torque Watch or Equivalent Waters, Model 651C 3-3.c.(7)

Digital Multimeter or Equivalent Kiethley, Model 179 3-6.z.(20)

Helium Leak Detector of Equivalent Veeco, Model MS-9 4-3.(b)(5)

High Vacuum Pump or Equivalent Honeywell, Inc., Model 1405B 4-3.(b)(2)

Gas and Fill Stand or Equivalent Litton Systems, Inc., G&C Division, Model T608142

4-3.(b)(2)

Oscilloscope AN/USM-281C 6625-00-106-9622 or equivalent

3-6.k.,l.,s.,t.,u.

Ultrasonic Cleaner or Equivalent AR

2-2

Figure 2-1. VSI Test Console

2-3

Legend for figure 2-1:

1. 400 HZ VOLTAGE meter 20. INDICATOR 28 VDC switch

2. POWER switch 21. VALIDITY switch

3. 400 HZ VOLTAGE CONTROL 22. INHIBIT switch

4. RATE switch 23. ATTD selector pushbutton

5. RATE CONTROL switch 24. OVERCURRENT switch

6. LIMIT REV/NORM switch 25. INTERACTION control

7. LIMIT ON/OFF switch 26. CURRENT ADJUST control

8. PHASE switch 27. METER MOVEMENTS milliammeter

9. DIRECTION switch 28. METER MOVEMENTS pushbutton

10. MASTER TRANSMITTER 29. FOCUS

11. STEP-INPUT switch 30. Line indicator light

12. GSP Polarity switch 31. On indicator light

13. OVERCURRENT ADJ control 32. Intensity

14. VOLTAGE ADJUST control 33. Trace rotation

15. AC COMMAND BAR SELECT switch 34. VOLTS/Div switch

16. POWER WARNING FLAG switch 35. Oscilloscope screen

17. CX PWR switch 36. TIME/Div switch

18. LIGHTS switch 37. Test points selector

19. IND PWR switch

Figure 2-2. Adapter Assembly/Cables

Legend for figure 2-2:

1. LIGHT RTN switch 6. ROLL SERVO INHIBIT switch

2. CMD ENABLE switch 7. PITCH SERVO INHIBIT switch

3. SERVO AMP MON ROLL jack 8. VSP CCP switch

4. SERVO AMP MON PITCH jack 9. GS FLAG OUT OF VIEW switch

5. SERVO AMP MON GND jack

2-4

Figure 2-3. VSI Overlay

c. Expendable Supplies and Materials. Expendable supplies and materials required to support depot maintenance of the VSI are listed in Appendix C.

SECTION II - STANDARDS

2-3. QUALITY OF MATERIALS.

All parts and materials used for replacement or repair will meet the requirements of indicated specifications or drawings.

2-4. WEAR LIMITS, FITS AND TOLERANCES.

All wear limits, fits and tolerances necessary for the maintenance of the VSI are specified in the assembly section of this manual.

2-5. REPAIR PARTS.

All repair parts required for maintenance of the indicator are illustrated in the disassembly section of this manual and Appendix B.

3-1

CHAPTER 3

MAINTENANCE, OVERHAUL AND REPAIR

SECTION I - GENERAL

3-1. GENERAL.

This chapter contains information necessary for the maintenance, overhaul, and repair of the VSI. Used components and refinished parts recovered as products of disassembly will be examined 100% to determine serviceability. Acceptable Quality Level (AQL) are specified for Government Final and Verification Inspection only.

SECTION II - SAFETY

3-2. SAFETY PRECAUTIONS.

Exercise extreme care when handling, conducting the alignment procedures, and while testing the VSI when not installed in the case. Potential shock hazards exist due to exposed high voltage components.

SECTION III - PRESHOP ANALYSIS

3-3. PRESHOP ANALYSIS.

The purpose of the preshop analysis is to determine, prior to beginning overhaul activities, the extent of overhaul required to return the VSI to a serviceable condition as specified herein.

a. Unpacking. Prior to unpacking VSI, check all forms and tags to determine the reason for removing VSI from service.

(1) Do not remove tags. If tags are missing, contact procuring activity and request missing information.

(2) Unpack VSI carefully from shipping container. Shipping containers will be saved for reuse if undamaged.

b. Inspection. Visually inspect VSI for damage due to shipment. Note any damage and report damage to procuring activity.

c. VSI Examination. Examine the assembled VSI in accordance with the following procedures:

(1) Examine VSI cover glass, bezel and external painted surfaces for imperfections.

(2) Examine VSI for foreign materials, internally and externally.

(3) Examine connector for soldering quality.

(4) Seal and tear strip will be feathered and smooth.

(5) Shake VSI in face-down position. there will be no foreign material or loose hardware present.

(6) Examine setscrews on PITCH and ROLL trim knobs (figure 1-2) for evidence of glyptal. Pull on each knob at least 3 times with knobs in different positions. The knobs will not be loose or slip on the shafts. Apply lateral and vertical pressure to each knob. There will be no lateral or vertical movement.

(7) Connect torque watch to PITCH trim knob (figure 1-2).

3-2

(8) Rotate PITCH trim knob (figure 1-2) from the full counterclockwise to the full clockwise position at least 5 times.

The torque required will be in the range of 2 to 6 oz. in.

(9) Repeat step c.(8) above with rotation from the full clockwise to the full counterclockwise position.

(10) Repeat steps c.(8) and c.(9) above with the torque watch connected to the ROLL trim knob (figure 1-2).

d. Pointer and Flag Balance and Inclinometer Operational Test. Conduct the pointer and flag balance and inclinometer operational test as follows:

(1) With VSI disconnected from adapter cable (see figure 2-2) rotate the VSI through 360 degrees of pitch and roll.

The horizontal and vertical steering pointers (figure 1-2) will be confined to within the diameter of the annular ring of the aircraft symbol. The vertical steering pointer will be straight and align with attitude spheroid roll scale index and localizer index. The horizontal steering pointer will be straight and align with glide slope index. The horizontal steering pointer will be straight and align with glide slop index. Localizer and glide slope pointers will be confined to within the thickness of their center scale markings. The collective command pointer will be confined within the apexes of the two triangular markings. The rate of turn pointer will not extend beyond the center scale marking by more than 1/8 of the width of the pointer. The flags will remain in view.

(2) Position VSI horizontally with reference to two top bezel mounting holes (see figure 1-2).

(3) Gently tap VSI. The skid indicator (figure 1-2) will rest at zero position on rate of turn scale within +0.032 in.

(4) Tip VSI from side to side in plane of dial. Skid indicator will center within +0.032 in. when returned to level from an angle of 10 degrees either side of vertical.

(5) Tip VSI to allow all air to be trapped in expansion chamber of skid indicator tube (see figure 1-2).

(6) Repeat step d.(2) above.

(7) Rotate VSI to a bank angle of 12 degrees with expansion chamber end of skid indicator tube low. During rotation, no part of air bubble will be visible when viewed perpendicular to cover glass with cover glass vertical.

3-4. TESTING OF VSI.

The following paragraphs provide test procedures for the VSI. The tests should be performed in the sequence given before the VSI is overhauled to determine the extent of overhaul required and again at the completion of overhaul to assure that the VSI is in proper operating condition. Testing of the VSI is accomplished using one of the following pieces of test equipment (depending on availability):

a. Test Console TE121880-3 See Paragraphs 3-5 and 3-6

b. Test Set MIT-234C See Paragraphs 3-7 and 3-8

Testing procedures define minimum performance levels required to ensure accurate VSI operation. It is assumed that all equipment is properly calibrated and connected, and switches and controls are set in accordance with the requirements of the specific test procedure. It is further assumed that the VSI is properly wired and assembled, with reference to the diagrams, schematic illustrations, exploded views and assembly instructions contained herein.

3-3

3-5. TEST SETUP USING TE121880-3.

The troubleshooting chart, table 3-3, should be used in conjunction with the connection schematic diagram, FO-1; power supply and servo amplifier circuit card schematic diagram, FO-3; and switching circuit card assembly schematic diagram, FO-2; to isolate a malfunction to a defective part whenever a test indication cannot be obtained.

Perform the preliminary test setup as follows:

a. Place all switches and adjustment controls on VSI test console, part number TE121880-3 (test console) figure 2-1, in their respective OFF, zero or counterclockwise position.

b. Connect the test console to the VSI (figure 1-1) using the adapter assembly/cables, part number TE133267 (figure 2-2) as per VSI test setup (figure 3-1).

c. Set adapter assembly/cables, figure 2-2, switches and controls as follows:

(1) INHIBIT switch (7) PITCH SERVO.

(2) INHIBIT switch (6) ROLL SERVO.

(5) COMMAND ENABLE (2) up.

(4) LIGHT RTN (1) OFF.

(5) GS FLAG (9) down.

Figure 3-1. VSI Test Setup Using TE121880-3

d. Connect the test console power cables to 115-volt, 400 HZ and 115-volt, 60 Hz power sources.

e. Set VSI test console, figure 2-1, switches as follows:

(1) POWER switch (2) to ON.

(2) CX PWR (17) ON.

(3) IND PWR (19) ON.

(4) POWER WARNING FLAG switch(16) ON.

The 50/60 HZ and 400 HZ indicators will be illuminated.

f. Turn 400 HZ VOLTAGE CONTROL (3) to produce reading 115 (+2.0) volts on the 400 HZ VOLTAGE meter (1).

3-4

3-6. OPERATIONAL TESTS USING TE121880-3.

Perform the VSI operational tests as indicated:

a. Command Warning Flag (CMD) Test. Conduct the command warning flag test as follows:

(1) Push VSP FLAG button (28, figure 2-1).

(2) Vary CURRENT ADJUST control (26) until VSI CMD warning flag (figure 1-2) is in view.

(3) Vary CURRENT ADJUST control (26, figure 2-1) clockwise and observe milliammeter (27). The VSI CMD warning flag will leave its stop with a minimum application of 180 microamperes.

(4) Turn CURRENT ADJUST (26) clockwise. The VSI CMD warning flag will deflect out of view with…