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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A
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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