(4)  
Varnish brush - 1- or 2-inch

(5) 
 Spatula

B.  Materials
(1)  
Aerodynamic smoother - class B-1/2

(2)  
Accelerator - as indicated on aerodynamic smoother container

(3)  
Aliphatic Naphtha - TT-N-95

(4)  
Anticorrosion Compound - BMS 3-23

2.  Remove Antenna
A.  Remove four mounting screws (Fig. 401).
B.  Using care, lower antenna from mounting until electrical cable can be disconnected.
CAUTION: DO NOT PULL ANTENNA.
C.  Disconnect antenna cable from antenna connector.
D.  Remove antenna and O-ring.
3.  Install Antenna
A.  Use cutting tool to remove aerodynamic smoother from antenna base and mounting area.
B.  Remove grease, oil, dirt, and chips from antenna base and mounting area. Use small varnish brush to apply fresh aliphatic naptha for cleaning. Wipe cleaner off with clean cloth.
C.  Apply a protective coat of corrosion preventive compound to faying surfaces of antenna and airplane structure (Ref 51-21-91, Cleaning/Painting).
D.  Place O-ring in position on antenna base.
E.  Connect antenna cable to antenna connector (Fig. 401).
F.  Position antenna in place and install four mounting screws.
G.  Check electrical bond between antenna base and airplane skin per 20-22-01. Resistance should not exceed 0.1 ohm.
H.  Apply fillet of aerodynamic smoother around antenna base using sealing gun or tube.
NOTE:  Make certain no air is trapped during filling. Overfill to allow, for smoothing and leveling.
I. Use spatula to smooth compound to an even 45-degree fillet. Remove excess compound.
501 
Feb 20/85  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  34-53-11 Page 401 

H30413
ATC Antenna Installation (Typical)  500 
34-53-11  Figure 401  May 15/80 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

1.  Test ATC Antenna
A.  Equipment and Materials
(1)  Transponder/DME Test Set - 1FR Model ATC-600A
B.  Prepare to Test ATC Antenna
(1)  
Set remote test set antenna approximately 21 inches from ATC antenna for system under test. Place test set antenna approximately same height as airplane antenna.

CAUTION:  DO NOT TURN TEST SET ON WHEN TEST SET ANTENNA IS WITHIN 15 INCHES OF AIRPLANE ANTENNA. DAMAGE TO TEST SET MAY RESULT.

(2)  
Connect coax from test set antenna to test set. Locate test set in flight compartment.

(3)  
Position test set controls as follows:

CONTROL  POSITION
PWR switch AC or BAT as appropriate MODE switch A/C CODE SLS switch Center position XMTR FREQ Set to 0
 FRAMING Set to 0 INTERR Set to 0
XPDR SIG  Fully CCW
(4)  
Energize No. 1 and 2 electronic buses.

(5)  
Close ATC circuit breakers.

CAUTION:  IN THE FOLLOWING TESTS DO NOT SELECT CODES 3100, 7600 OR 7700. THESE ARE EMERGENCY CODES.
NOTE:  In the following test the reply (monitor) light on the ATC control panel comes on whenever the ATC transponder transmits a reply to the test set, unless otherwise stated. Also, the % reply meter on the test set indicates 100% when the transponder is replying.
562 
Aug 15/80  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  34-53-11 Page 403 

C.  Test ATC Antenna
(1)  
Select system No. 1 or 2, depending upon the antenna being tested, on ATC control module.

(2)  
On ATC control module, place altitude reporting switch to OFF, place mode switch to A and select ATC code 3333. Place mode switch on the test set to Mode B.

(3)  
Allow 2 minutes for system to warm up. Check that REPLY light on control panel is off.

(4)  
On ATC control module, press TEST button and verify that REPLY light comes on.

(5)  
Release TEST button. Place mode switch on test set to A/C CODE. Check that test set display indicates 3333.

(6)  
If no longer required, remove electrical power from airplane.

562 
34-53-11 Page 404  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Aug 15/80 

ATC TRANSPONDER - REMOVAL/INSTALLATION
1. General
A.  The ATC transponder is installed in the main equipment center on shelf E2-1. The unit is shock mounted and held in place by two hold down hooks. Some transponders require an adapter to fit into the existing mount. The transponder and adapter should be removed or installed as one unit.
　
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