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 21-51-06
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 024-025
 CAUTION: DO NOT TOUCH THE CONNECTOR PINS OR OTHER CONNECTORS ON THE AIR
_______ CONDITIONING ACCESSORY UNIT. IF YOU TOUCH THESE CONDUCTORS, ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE AIR CONDITIONING ACCESSORY UNIT.
 (3) Remove the air conditioning accessory unit (Ref 20-10-07/201).
 TASK 21-51-06-404-003
 3.  Air Conditioning Accessory Unit Installation (Fig. 401)____________________________________________
 A. References
 (1)  
AMM 20-10-07/201, E/E Rack-Mounted Components

 (2)  
AMM 21-51-06/501, Air Conditioning Relays Module

 (3)  
AMM 24-22-00/201, Electrical Power

 (4)  
AMM 27-51-00/001, Trailing Edge Flap System

 B. Access
 (1)  
Location Zone
 101 Left Control Cabin
 102 Right Control Cabin
 205 Electronic Compartment
 208 Forward Cargo Compartment

 (2)  
Access Panel
 1201L Electronic Equipment Access Door

 C. Procedure
 S 424-004
 (1)  
Install the air conditioning accessory unit (AMM 20-10-07/201).

 S 714-007

 (2)  
Do this test of the air conditioning accessory unit:

 NOTE: If you replace the Air Conditioning Accessory Unit (ACAU)
____ because it has a defect, it is recommended that the ACAU Adjustment/Test (Ref 21-51-06/501) be done. If there is not sufficient time to do the full adjustment/test, you may make a decision to do only the part of the ACAU Adjustment/Test (Ref 21-51-06/501) that does a test of the system with the defect. If just one test is done, you must do all of the adjustment/test (Ref 21-51-06/501) when there is sufficient time. If the ACAU is being replaced for any other reason, you may do just the test that follows.
 (a)  
Supply electrical power (Ref 24-22-00/201).

 (b)  
Open this access panel: 1) 1201L - Electronic Equipment Access Door

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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737-300/400/500MAINTENANCE MANUAL
 (c)  Make sure these circuit breakers on the P6-4 Load Control
 Circuit Breaker panel are closed:
 1) AIR CONDITIONING FWD OUTFLOW VALVES
 2) AIR CONDITIONING RECIRC FAN CONTROL
 3) AIR CONDITIONING RECIRC FAN ENERGIZED
 4) PRESSURIZATION CONTROL AUTOMATIC AC
 5) PRESSURIZATION CONTROL AUTOMATIC DC
 6) PRESSURIZATION CONTROL STBY AC
 7) PRESSURIZATION CONTROL STBY DC
 8) PRESSURIZATION CONTROL MAN AC
 9) PRESSURIZATION CONTROL MAN DC
 (d)  Make sure these circuit breakers on the P6-3 Load Control
 Circuit Breaker panel are closed:
 1) CONTROL CABIN LIGHTING DIM & TEST
 2) CONTROL CABIN LIGHTING SECT 1
 3) MASTER CAUTION AIR COND
 4) MASTER CAUTION ANNUNCIATOR BAT
 5) MASTER CAUTION ANNUNCIATOR NO. 1
 (e)  Make sure the No. 1 AIR DATA COMPUTER circuit breaker on the
 P18 panel is closed.
 (f)  Set the mode selector switch on the pressurization control
 panel (P5) to AUTO.
 (g)  Set the FLT-GRD switch on the pressurization control panel (P5)
 to GRD.
 (h)  Set the switches on the P5-10 panel to these positions:
 1) L PACK switch to OFF
 2) R PACK switch to OFF
 3) BLEED 1 switch to OFF
 4) BLEED 2 switch to OFF
 5) ISOLATION VALVE switch to OPEN
 6) RECIRC FAN SWITCH to AUTO
 (i)  Remove the forward left lining in the forward cargo
 compartment.
 (j)  Make sure the aft outflow valve is in the full-open position.
 (k)  Make sure the forward outflow valve is in the full-closed
　
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