C.  Procedure
 S 864-022
 WARNING: REMOVE THE POWER FROM EACH HF COMMUNICATION SYSTEM,
_______ BEFORE YOU REMOVE THE HF COMMUNICATION ANTENNA. HF SIGNALS CAN CAUSE ELECTRICAL SHOCKS AND INJURIES TO PERSONS.
 (1)  Open these circuit breakers on the overhead circuit breaker panel, P11, and attach DO-NOT-CLOSE tags:
 (a)  
11G8, HF COMM LEFT

 (b)  
11G34, HF COMM RIGHT (if installed)

 S 024-003
 (2)  Remove the part of the leading edge of the vertical stabilizer that contains the HF communication antenna (AMM 55-35-01/401).
 TASK 23-11-04-424-004
 3.  HF Communication Antenna Installation
_________________________________________
 A.  References
 (1)  
AMM 23-11-00/501, HF Communication System

 (2)  
AMM 55-35-01/401, Vertical Stabilizer Leading Edge

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A

757
MAINTENANCE MANUAL

 B. Access
 (1)  Location Zones
 211 Flight Compartment (Left)
 212 Flight Compartment (Right)
 321 Vertical Stabilizer

 C. Procedure
 S 864-007
 WARNING: REMOVE THE POWER FROM EACH HF COMMUNICATION SYSTEM BEFORE
_______ YOU INSTALL THE HF COMMUNICATION ANTENNA. HF SIGNALS CAN CAUSE ELECTRICAL SHOCKS AND INJURIES TO PERSONS.
 (1)  Make sure these circuit breakers are open on the overhead circuit breaker panel, P11.
 (a)  
11G8, HF COMM LEFT

 (b)  
11G34, HF COMM RIGHT (if installed)

 S 754-020
 (2)  
Install part of the leading edge of the vertical stabilizer that contains the HF communication antenna (AMM 55-35-01/401).

 S 864-019

 (3)  
Remove DO-NOT-CLOSE tags and close these circuit breakers on the overhead circuit breaker panel, P11:

 (a)  
11G8, HF COMM LEFT

 (b)  
11G34, HF COMM RIGHT (if installed)

 D. Installation Test
 S 754-021
 (1)  Do this task: System Test - HF Communication System
 (AMM 23-11-00/501).

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757 MAINTENANCE MANUAL
 HF COMMUNICATION ANTENNA - INSPECTION/CHECK
___________________________________________
 1.  General_______
 A.  This procedure has this task.
 (1) An electrical bond check of the HF communication antenna.
 B.  The HF communication antenna is part of the leading edge of the vertical stabilizer.
 C.  You must remove the HF antenna coupler(s) to do the electrical bond check. The HF antenna coupler(s) are installed adjacent to the HF communication antenna in the vertical stabilizer.
 TASK 23-11-04-766-001
 2.  HF Communication Antenna - Electrical Bond Check (Fig. 601)________________________________________________
 A.  Equipment
 (1)  Bonding Meter (SWPM 20-20-00)
 B.  References
 (1)  
AMM 23-11-01/401, HF Communications Antenna Coupler

 (2)  
SWPM 20-20-00, Electrical Bonding and Grounding

 C.  Procedure
 S 426-002
 CAUTION:_______YOU MUST PREPARE EACH HF ANTENNA COUPLER FOR REMOVAL. IF YOU DO NOT PREPARE FOR THE REMOVAL, YOU CAN EASILY CAUSE DAMAGE TO THE INTERNAL PARTS OF THE HF ANTENNA COUPLER.
 (1)  
Remove the HF communications antenna coupler(s) (AMM 23-11-01/401).

 S 766-004

 (2)  
Measure the resistance that follows at each antenna coupler mount (SWPM 20-20-00):

 (a)  
The RF center conductor of the antenna coupler mount to the antenna coupler mount frame. 1) Make sure the resistance is 10 milliohms or less.
　
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