(2)  
Carefully pull coupler thru hole and disconnect coax/electrical connectors from both ends of coupler.

 (3)  
Remove two screws attaching coupler to mounting plate and remove coupler.

 B.  On airplanes with sense antennas installed forward of the wheel wells (Fig. 401):
 (1)  
Open air conditioning underwing access panel (ref above).

 (2)  
Disconnect coax/electrical cables from both ends of applicable coupler.

 EFFECTIVITY

 
 ALL  01 Page 401  Apr 25/9734-57-01
AFT E/E CENTER HATCH
SEE A
ADF SENSE ANTENNA COUPLER
ANTENNA
FEED STUB

FWD BOLT BACB30LH3-4 DIMPLED WASHER 69B12800-2
ANTENNA NO. 1 ADF SENSE 
ANTENNA NO. 2 ADF SENSE 
ERROR CORRECTOR QUADRANTAL 
LOOP ANTENNA LOOP ANTENNA NO. 1 ADF NO. 2 ADF  ANTENNA LOOP 
ASSEMBLY COVER 
CONNECTOR LOOP ANTENNA 

ADF SENSE ANTENNA NO. 1 (ADF SENSE ANT NO. 2 SIMILAR/REVERSED)
COVER ASSEMBLY MOUNTING SCREWS (17 PLACES)
ADF LOOP ANTENNA
(TYPICAL)

SENSE ANTENNA COUPLER
ANTENNA CABLE
ELECTRICAL CONNECTOR
NO. 1 SENSE ANTENNA COUPLER
A
Antenna Components Removal/Installation
Figure 401 (Sheet 1)

EFFECTIVITY

AF 101-151; IB 405; LH 001-010; SN 301,302; LESS AIRPLANES 799 Page 402 INCORPORATING SB 34-2114 Apr 25/86
34-57-01
RH UNDERWING ANT MTG FAIRING BOLT/FASTENERS AFT E/E CENTER
NO. 2 ADF NO. 2 ADF HATCH SENSE ANT SENSE ANT
ANT COUPLERS NO. 1 ADF SEE A SENSE ANT
BL 0
NO. 1 ADF SENSE ANT NO. 2 ADF
NO. 1 ADF
LOOP ANT LOOP ANT
LOOP ANTENNA (2)
ANT FEED QUADRANTALSTUDS
KEEL ERROR
SEE A
BEAM CONNECTOR
STA 1170
AIR COND ACCESS PANEL (HINGED) LOOP ANTENNA CONNECTOR
ADF SENSE ANTENNASCOVER ASSEMBLY MOUNTING SCREWS
(FWD OF WHEEL WELLS)
(17 PLACES) COVER
FWD ASSEMBLY
COUPLER
STA 1170 NO. 1
ADF LOOP ANTENNA (TYPICAL)
STA 1170 FLAME SPRAY ANT
SURFACE COUPLER NO. 2
COUPLER NO. 2
NON-FLAME SPRAY
CONDUCTIVE ANT SURFACE
EDGE BAND
GAP  NON-CONDUCTIVE 
GND PLANE  EDGE BAND GAP 
FLAME SPRAY  SENSE ANT FLAME  GND PLANE 
PERIMETER  SPRAY CONTACT/FEED  FLAME SPRAY 
FASTENER (TYPICAL) 43 PLACES EACH ANT MTG BOLT AND  INBD STUD (TYPICAL)  FWD PERIMETER  NO. 1 COUPLER  SPRAY CONTACT/FEED SENSE ANT FLAME STUD (TYPICAL) 
SENSE ANTENNA COUPLERS  1  SENSE ANTENNA COUPLERS  2 
A  A 

1 AF 152-155,172-197; AZ 221-224,231-233, 2 AF 156-171,198,199; AZ 201-220,225-230,234-280, 281; IB 406-410; LH 011-013,051-059, 282-299; IB 401-404,411-499; LH 014-050,060-081, 082,083; AT,GN,MD, AND VM ALL, LESS 084-099; SN 303-399; PLUS AF,AT,AZ,GN,IB,LH,MD, AIRPLANES INCORPORATING SB 34-2195 SN, AND VM AIRPLANES INCORPORATING SB 34-2195
Antenna Components Removal/Installation
Figure 401 (Sheet 2)
EFFECTIVITY

AIRPLANES INCORP SB 34-2114 799 Page 403
34-57-01
Apr 25/86
 (3)  Remove screws attaching coupler to coupler mounting plate, then remove coupler. Wire attached to sense antenna stud may be removed by removing nut and washer at the stud.
 6.  Install Sense Antenna Coupler (Fig. 401)
_____________________________
 A.  On airplanes with sense antennas mounted aft of the wheel wells (Fig. 401):
 (1) Install two screws attaching coupler to coupler mounting plate.
 NOTE: All attaching surfaces must be bonded per Chapter 20 of
____
 wiring diagram manual.

 (2)  
Connect electrical connector and antenna cable to coupler.

 (3)  
Replace coupler thru hole with electrical connector down and inboard.

 (4)  
Replace four screws attaching coupler mounting plate to bulkhead.

 B.  On airplanes with sense antennas installed forward of the wheel wells (Fig. 401):
 (1) Install screws attaching coupler to coupler mounting bracket.
 NOTE: All attaching surfaces must be bonded per Chapter 20 of
____
 wiring diagram manual.

 (2)  Connect electrical connector and antenna cable to coupler. Make certain that cable at antenna stud is attached firmly with nut and washers.
 C.  Test antenna coupler per par. 12.
 7.  Remove Sense Antenna (Fig. 401)
____________________
 A.  Remove antenna coupler and/or cable connection between antenna feed stud and coupler per par. 5, as required so antenna may be removed.
　
中國航空網(wǎng) www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747飛機維護手冊AMM CHAPTER 34 - NAVIGATION 第34章導(dǎo)航4(114)