S 114-027

 (6)  
Remove the used sealant from the airplane skin (AMM 20-10-22/701).

 S 114-006

 (7)
Clean the airplane surface with the solvent and a clean rag.

 (a) Remove all unwanted materials (AMM 20-10-22/701).
 TASK 23-12-03-424-007
 3.  VHF Communication Antenna - Installation (Fig. 401)________________________________________
 A. References
 (1)  
AMM 24-22-00/201, Electrical Power - Control

 (2)  
AMM 51-21-04/701, Alodine 1200 Coating

 (3)  
AMM 51-31-01/201, Seals and Sealing

 B. Equipment
 (1) Resistance measuring bridge or ohmmeter to measure 0.001 ohm.
 C. Consumable Materials
 (1)  
A00247 Sealant - BMS 5-95 (AMM 20-30-01/201)

 (2)  
C00064 Coating - Protective (Alodine 1200) (AMM 20-30-03/201)

 D. Access
 (1)  Location Zones 233/234 Area above passenger cabin ceiling - section 43
 (exterior) 123/124 Area below forward cargo compartment (exterior) 155/156 Area below aft cargo compartment (exterior)
 E. Procedure
 S 864-022
 (1)  Make sure the applicable circuit breakers on the overhead circuit breaker panel, P11, are open:
 (a)  
11C3, VHF COMM LEFT

 (b)  
11G4, VHF COMM CENTER (IF INSTALLED)

 (c)  
11G31, VHF COMM RIGHT

 S 214-009
 (2)  Look at the antenna O-ring (given with the new antenna), and replace if it is damaged.
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A

757
MAINTENANCE MANUAL

 S 204-010
 CAUTION:_______MAKE SURE THE MATING SURFACES ARE CLEAN. A GROUND THAT IS NOT SUFFICIENT WILL CAUSE SYSTEM FAILURE.
 (3)  Make sure the mating surfaces of the antenna and the airplane have no unwanted material.
 (4)  S 624-011Prepare the mating surfaces for a layer of Alodine 1200 (AMM 51-21-04/701).
 (5)  S 624-012Apply a layer of Alodine 1200 to the mating surfaces of the antenna and the airplane (AMM 51-21-04/701).
 (6)  S 434-013Connect the coaxial cable to the antenna.
 (7)  S 824-025Put the antenna in position.
 (8)  S 394-026Apply a layer of sealant on the mounting bolts.
 (9)  S 434-030Install a mounting bolt of correct length (AIPC 23-12-03-01) and tighten before the sealant is dry.
 S 204-015

 (10)
 Remove unwanted sealant from around the mounting bolt.

 S 224-016

 (11)
 Make sure the resistance from the antenna base to airplane skin is not larger than 0.001 ohm.

 S 864-017

 (12)
 Apply a weather-aerodynamic fillet seal to the edge of the antenna as shown (AMM 51-31-01/201).

 S 204-018

 (13)
 Remove all unwanted sealant from around the antenna base (AMM 51-31-01/201).

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757 MAINTENANCE MANUAL
 S 864-024
 (14) Remove DO-NOT-CLOSE tags and close the applicable circuit breakers on the overhead circuit breaker panel, P11:
 (a)  
11C3, VHF COMM LEFT

 (b)  
11G4, VHF COMM CENTER (IF INSTALLED)

 (c)  
11G31, VHF COMM RIGHT

 F. VHF Communication Antenna Installation Test
 S 864-020
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 714-032

 (2)  
Tune in a VHF station and make sure the transmission and reception are satisfactory.

 S 864-028

 (3)
Remove electrical power if it is not necessary (AMM 24-22-00/201).

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