DRAFT_Appendix_F_BELLY_ANTENNAS.pptx

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

MARKER BEACON FS 467 BL 65L

P/N S35-2000-1

FREQ RANGE: 75 MHZ

PART OF ARN-123 VOR/ILS SYSTEM

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

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

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 457 BL 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

ADDITIONAL NOTES

PER ORIGINAL TCAS II INTEGRATION (1992) GUIDELINES FOR ANTENNA INSTALLATION:

The TCAS II directional antennas should be located more than 30 inches from any other l-band radiators (antennas).

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

FROM AC 20-151B TCAS II AND ASSOCIATED MODE S TRANSPONDER

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.

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

ANTENNAS SHOULD BE SEPARATED AS FAR AS POSSIBLE FROM INTERFERENCE SOURCES

EXTENSION OF THE LANDING GEAR OR FLAPS MAY ALSO IMPACT BELLY MOUNTED ANTENNA PERFORMANCE

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

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 A RESISTANCE OF NO MORE THEN 0.003 OHMS BETWEEN THE ANTENNA BASE PLATE AND SKIN SHOULD BE ACHIEVED

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