(2)  
AMM 24-22-00/201, Electrical Power - Manual Control

 B.  Access
 (1)  Location Zones
 153 Aft Cargo Compartment (Left)
 154 Aft Cargo Compartment (Right)
 119 Main Equipment Center (Left)
 120 Main Equipment Center (Right)
 211 Control Cabin (Left)
 212 Control Cabin (Right)

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757
MAINTENANCE MANUAL

 (2)  Access Panel
 822 Aft Cargo Compartment Access
 119BL Main Equipment Center Access

 C. Procedure
 S 424-010
 (1)
Install the HF communication transceiver (AMM 20-10-01/401).

 S 864-012

 (2)  
Remove DO-NOT-CLOSE tags and close the applicable circuit breakers on the overhead circuit breaker panel, P11:

 (a)  
11G8, HF COMM LEFT

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

 D. Installation Test - HF Communication Transceiver.
 S 864-015
 WARNING: DO NOT OPERATE THE HF SYSTEM WHILE FUEL IS PUT INTO THE
_______ AIRPLANE. THIS CAN CAUSE INJURY TO PERSONS AND DAMAGE EQUIPMENT.
 WARNING: MAKE SURE PERSONNEL STAY A MINIMUM OF 6 FEET AWAY FROM THE
_______ VERTICAL STABILIZER WHEN THE HF SYSTEM TRANSMITS. RF ENERGY FROM THE HF COMMUNICATION ANTENNA CAN CAUSE INJURIES TO PERSONNEL.
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 864-017

 (2)  
Set the mode selector switch to the AM position on the HF
 communication control panel (P5).

 (3)
Make sure the internal blower fan on the transceiver operates.

 S 204-019
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 S 744-040
 (4)  AIRPLANES WITH COLLINS HFS-700 TRANSCEIVER;
 Do these steps to do the transceiver test:

 (a)  
Push and hold the SQL/LAMP TEST switch on the transceiver front panel. 1) Make sure the LRU FAIL, KEY INTERLOCK, and CONTROL INPUT

 FAIL lights come on and stay on.

 (b)  
Release the SQL/LAMP TEST switch.

 1)  Make sure the LRU FAIL, KEY INTERLOCK, and CONTROL INPUT FAIL lights go out.
 E.  Put the airplane back to its initial condition.
 S 864-021
 (1)  
Set the mode selector switch to the OFF position on the HF
 communication control panel, (P5).

 (2)
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 S 864-022
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757 MAINTENANCE MANUAL
 HF COMMUNICATION ANTENNA - REMOVAL/INSTALLATION
_______________________________________________
 1.  General
_______
 A.  Two tasks are in this procedure:
 (1)  
Removal of the HF communication antenna.

 (2)  
Installation of the HF communication antenna.

 B.  The HF communication antenna is part of the leading edge of the vertical stabilizer.
 TASK 23-11-04-024-001
 2.  HF Communication Antenna Removal
____________________________________
 A.  References
 (1)  AMM 55-35-01/401, Vertical Stabilizer Leading Edge
　
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