Appendix_F_BELLY_ANTENNAS.pdf

USFS HC-130H

BELLY ANTENNAS

BELLY ANTENNA

NOTES

1) ALL FLIGHT STATIONS AND BUTT LINES ARE APPROXIMATE, THERE ARE

SLIGHT VARIATIONS BETWEEN AIRCRAFT, HOWEVER, ALL AIRCRAFT

FOLLOW THIS BASIC LAYOUT.

2) USCG/USFS AIRCRAFT USE AVDEC GASKETS ON ALL BELLY ANTENNAS

ACMS MPC 051006.0 APPLIES

3) USFS OPERATIONAL PACKAGE DOES NOT ALTER THE BELLY ANTENNA

ARRANGEMENT. SOME ARE INACTIVE AND SOME REPURPOSED BUT

NONE ADDED.

BELLY ANTENNA MAP

(except 1721)

1721 BELLY ANTENNA MAP

THE BELLY

IFF/ APX-100 FS 667

TACAN #1 FS 597

DF-430 FS 547

TACAN #2 FS 502

MODE S FS 417

AIS FS 457

MKR BCN FS 467

BUDDY FS 377

ADF SENSE ANTENNA BAY FS 637

MODE S ANTENNA FS 417 BL 0

P/N AT-741B/A

FREQ RANGE: 960-1220 MHZ

PART OF TCAS SYSTEM

REQUIRED FOR FLIGHT

PASSIVE ANTENNA

DURING CREW WORKING

GROUP IT WAS MENTIONED

THIS MAY HAVE TO BE MOVED

FORWARD DUE TO FAIRING

FOR RDS DOORS

FORWARD

AIS ANTENNA FS 457

RIGHT WHEEL WELL FAIRING

P/N S65-8280-4

FREQ RANGE: 140-180 MHZ

ORIGINALLY USED FOR AIS

REQUIRED FOR FLIGHT

RE-PURPOSING THIS ANTENNA

FOR TDFM-9000 MODULE 2

PASSIVE ANTENNA

MARKER BEACON FS 467 BL 65L

P/N S35-2000-1

FREQ RANGE: 75 MHZ

PART OF ARN-123 VOR/ILS

SYSTEM

REQUIRED FOR FLIGHT

TACAN #2 ANTENNA FS 502 BL 0

FREQ RANGE: 960-1220 MHZ

PART OF #2 TACAN SYSTEM

REQUIRED FOR FLIGHT

PASSIVE ANTENNA

DURING CREW WORKING

GROUP IT WAS MENTIONED

THIS ANTENNA COULD BE

MOVED LEFT OR RIGHT ALONG

THE SAME FS TO ALLOW FOR

THE RDS DOORS

DF-430F ANTENNA FS 547 BL 0

ANT-430F

P/N 597-2147-101

FREQ RANGE: 30-406.025 MHZ

INACTIVE SYSTEM, COULD

BE REMOVED

HAS A RADOME COVER,

ANTENNA LOCATED UNDER

WITH 6 ATTACHING SCREWS

RADOME INSIDE

ANT-430F

ORIGINALLY DF-301 ANTENNA BAY

TACAN #1 ANTENNA FS 597 BL 4L

FREQ RANGE: 960-1220 MHZ

PART OF #1 TACAN SYSTEM

REQUIRED FOR FLIGHT

PASSIVE ANTENNA

DURING CREW WORKING

GROUP IT WAS MENTIONED

THIS ANTENNA COULD BE

MOVED LEFT OR RIGHT ALONG

THE SAME FS TO ALLOW FOR

THE RDS DOORS

INSIDE VIEW

THIS IS THE INACTIVE ADF

SENSE ANTENNA BAY. THE

INTERNAL ANTENNA

STRUCTURE MAY STILL BE

PRESENT.

THIS PANEL SPANS THE BELLY

FROM CHINE TO CHINE AND IS

SEALED AND SECURED WITH

SCREWS

1721 IS DIFFERENT, EXPLAINED

LATER IN PRESENTATION.

THE LEADING EDGE OF THE TAPE IS APPROX

FS 637, THE PROPOSED AFT END OF THE RDS

DOORS

INSIDE STRUCTURE

APPROX FS 637 THE PROPOSED

AFT END OF THE RDS DOORS

FWD

1702 ADF SENSE ANTENNA BAY

INSIDE STRUCTURE DURING RDS CREW WORKING GROUP

FS 637 IS THE PROPOSED AFT

END OF THE RDS DOORS

NOTE THE ADF SENSE

ANTENNA STRUCTURE BELOW

IFF / APX-100 ANTENNA FS 667 BL 0

P/N AT-740/A

FREQ RANGE: 960-1220 MHZ

FLUSH MOUNT

PASSIVE ANTENNA

PART OF APX-100 IFF

INACTIVE SYSTEM DISABLED

DURING DE-MIL. R/T AND

CONTROL HEAD REMOVED.

ALL WIRING, CABLES AND

ANTENNAS REMAIN.

1708 UNDER FLOOR VIEW

1721 DIFFERENCES

1. THE 1721 ANTENNAS ARE PRETTY MUCH CENTER LINE

2. ADDITIONAL DOUBLERS ON AND ACROSS THE ADF SENSE

ANTENNA BAY

3. THE AIS ANTENNA (RE-PURPOSED FOR TDFM-9000) IS ON THE

PRESSURIZED SKIN UNLIKE THE REST THAT ARE ON THE RH

WHEEL WELL

1721 BELLY

IFF/APX-100 FS 667

MARKER BEACON FS 467

ADF SENSE ANT BAY FS 637

TACAN #1 FS 597

not much off center

TACAN #2 FS 502

AIS FS 457

DF-430 FS 547

MODE S FS 417

ADDITIONAL STRUCTURE,

LEFT SIDE BELLY SIMILAR

1721 UNDERFLOOR PAINT

APPROX FS 637

BULKHEAD

NOTE:

THE SENSE ANTENNA

PANEL IS REMOVED.

THE STRUCTURE TO

ACCOMMODATE THE

PANEL REMAINS. FS

637 BULKHEAD DOES

NOT EXTEND TO THE

BELLY

1721 ADF SENSE ANTENNA BAY

ADDITIONAL OUTSIDE STRUCTURES

THERE ARE 4 STRIPS MEASURING 4”

X 54” FASTENED WITH STRUCTURAL

HARDWARE

THESE STRIPS WERE INSTALLED

DURING PREVIOUS MODIFICATIONS

ON THE LEFT AND RIGHT SIDE OF

THE SENSE ANTENNA BAY.

THE CENTER PANEL

APPEARS TO BE A

DOUBLER AND STANDS

PROUD OF THE OUTSIDE

SKIN. SEALED AND

FASTENED IN PLACE

THE OUTSIDE STRIPS

FOLLOW LEFT AND

RIGHT BL 61 ATTACH

ANGLE (CHINE)

THE INSIDE STRIPS

ARE APPROXIMATELY

21 INCHES OFF

CENTER LINE

1721 AIS ANTENNA FS 457BL 55R (approx)

PRESSURIZED SKIN

P/N S65-8280-4

FREQ RANGE: 140-180 MHZ

ORIGINALLY USED FOR AIS

RE-PURPOSING THIS ANTENNA

FOR THE TDFM-9000 MODULE 2

REQUIRED FOR FLIGHT

ADDITIONAL NOTES

1. PER ORIGINAL TCAS II INTEGRATION (1992)

GUIDELINES FOR ANTENNA INSTALLATION:

A. THE TCAS II DIRECTIONAL ANTENNAS SHOULD BE

LOCATED MORE THAN 30 INCHES FROM ANY OTHER L-

BAND RADIATORS (ANTENNAS).

B. THE DIRECTIONAL ANTENNAS SHOULD BE LOCATED ON

THE AIRFRAME CENTERLINE SUCH THAT THE TILT ANGLE

DOES NOT EXCEED 5 DEGREES (NO SUGGESTION TO

MOVE THE DIRECTIONAL ANTENNA)

POSSIBILITY OF MOVING THE BOTTOM MODE-S ANTENNA

FORWARD DUE TO THE PROPOSED RDS DOOR FAIRING

1. FROM AC 20-151B TCAS II AND ASSOCIATED

MODE S TRANSPONDER

A. OMNI-DIRECTIONAL ANTENNAS – MOUNT THE

TCAS II OMNI-DIRECTIONAL ANTENNA ON THE

BOTTOM OF THE AIRCRAFT FUSELAGE AS CLOSE

TO CENTERLINE AS POSSIBLE WITH AT LEAST

20dB ISOLATION FROM OTHER L-BAND

FREQUENCY ANTENNAS.

1. PER FAA AC 43.13-2B CH 3 ANTENNA INSTALLATION:

A. ANTENNAS SHOULD BE SEPARATED AS FAR AS POSSIBLE FROM

INTERFERENCE SOURCES

B. EXTENSION OF THE LANDING GEAR OR FLAPS MAY ALSO IMPACT BELLY

MOUNTED ANTENNA PERFORMANCE

C. TRY TO LOCATE THEM IN AREAS WHERE LINE-OF-SIGHT VIEW IS NOT

OBSTRUCTED

D. AS A RULE OF THUMB, MAINTAIN 36 INCHES AS A MINIMUM DISTANCE

BETWEEN ANTENNAS. REFER TO THE MANUFACTURES INSTALLATION

GUIDELINES FOR SPECIFIC SYSTEM LIMITATIONS AND REQUIREMENTS

E. A RESISTANCE OF NO MORE THEN 0.003 OHMS BETWEEN THE ANTENNA

BASE PLATE AND SKIN SHOULD BE ACHIEVED

BOTTOM LINE: TEST FOR PERFORMANCE