TASK 23-11-51-004-001
 2. HF Communication Antenna Removal
________________________________
 A. References
 (1)  AMM 55-33-11/401, Vertical Stabilizer (Fin) Leading Edge
 B. Access
 (1)  Location Zone
 101 Control Cabin, left
 102 Control Cabin, right
 706 Vertical Stabilizer

 C. Procedure
 S 864-002
 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 and attach DO-NOT-CLOSE tags:
 (a)  
P18 Circuit Breaker Panel
 1) C839, HF-1 AC
 2) C346, HF-1 DC

 (b)  
P6 Circuit Breaker Panel
 1) C857, HF-2 AC (if installed)
 2) C477, HF-2 DC

 S 864-003
 (2)  Remove the part of the leading edge of the vertical stabilizer that contains the HF communication antenna (AMM 55-33-11/401).
 TASK 23-11-51-404-015
 3. HF Communication Antenna Installation
_____________________________________
 A. References
 (1)  
AMM 23-11-00/501 or AMM 23-11-01/501, HF Communication System

 (2)  
AMM 55-33-11/401, Vertical Stabilizer (Fin) Leading Edge

 B. Access
 (1)  Location Zone
 101 Control Cabin, left
 102 Control Cabin, right
 706 Vertical Stabilizer

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 C. Procedure
 S 864-025
 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 the applicable circuit breakers are open:
 (a)  
P18 Circuit Breaker Panel
 1) C839, HF-1 AC
 2) C346, HF-1 DC

 (b)  
P6 Circuit Breaker Panel
 1) C857, HF-2 AC (if installed)
 2) C477, HF-2 DC

 S 424-026
 (2)  
Install the part of the leading edge of the vertical stabilizer that contains the HF communication antenna (AMM 55-33-11/401).

 S 864-020

 (3)
Remove the DO-NOT-CLOSE tags and close these circuit breakers:

 (a)  
P18 Circuit Breaker Panel
 1) C839, HF-1 AC
 2) C346, HF-1 DC

 (b)  
P6 Circuit Breaker Panel
 1) C857, HF-2 AC (if installed)
 2) C477, HF-2 DC

 D. Installation Test
 S 864-024
 (1)  Do this task: Operational Test - HF Communication System
 (AMM 23-11-00/501 or AMM 23-11-01/501).

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 HF VERTICAL FIN ANTENNA - INSPECTION/CHECK
__________________________________________
 1.  General_______
 A.  This procedure has this task.
 (1) An electrical bond check of the HF vertical fin antenna.
 B.  The HF vertical fin 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 vertical fin antenna in the vertical stabilizer.
 TASK 23-11-51-766-001
 2.  HF Vertical Fin Antenna - Electrical Bond Check_______________________________________________
 A.  References
 (1)  
AMM 23-11-61/401, HF Antenna Coupler

 (2)  
SWPM 20-20-00, Standard Wiring Practices Manual

 B.  Equipment
 (1)  (SWPM 20-20-00)
 C.  Procedure
　
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