30-21-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 865-064
 (6)  Put the pneumatic system to its initial condition:
 (a)  
Remove the wrench from the PRSOV.

 (b)  
BEJ B-2535 AND ON; Connect the electrical connector to the bleed air regulator.

 (c)  
If this test was for the right engine, set the ISOLATION VALVE switch to CLOSE.

 G. Remove the Pressure from the Pneumatic System
 S 865-080
 WARNING: YOU MUST STOP THE OPERATION OF THE SOURCE USED TO PRESSURIZE
_______ THE PNEUMATIC SYSTEM. IF THE PNEUMATIC SYSTEM IS PRESSURIZED DURING THE MAINTENANCE, IT CAN CAUSE DAMAGE TO THE EQUIPMENT OR INJURIES TO PERSONS.
 (1)  
Stop the operation of the ground air source which was used to pressurize the pneumatic system:

 S 215-067

 (2)  
Make sure the two indicators, on the forward overhead panel, show 0 psi.

 H. Put the Airplane Back to Its Usual Condition
 S 415-066
 (1)  If it is applicable, disconnect the pneumatic line for the ground air source.
 (a)  Close the right A/C access door, 3404, for the pneumatic ground service connector.
 S 415-062
 (2)  
Close the left thrust reverser half (AMM 78-31-00/201).

 S 865-063

 (3)  
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 TASK 30-21-00-735-019
 5.  System Test - Inlet Cowl Anti-Icing System__________________________________________
 A. Standard Tools and Equipment
 (1)  Headset intercom - for communication between control cabin and engine area
 B. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 71-11-02/201, Fan Cowl Panels (Opening and Closing)

 C. Access
 (1)  
Location Zone
 101, 102 Control Cabin
 503, 603 Fan Cowl (Right Half)

 (2)  
Access Panels
 5746, 5846 Fan Cowl Assembly (Right Half)

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 30-21-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 D. Procedure
 S 015-020
 (1)  
Open the right fan cowl panel on the applicable engine
 (AMM 71-11-02/201).

 S 865-021

 (2)  
Supply electrical power (AMM 24-22-00/201).

 S 865-044

 (3)  
Open these circuit breakers and attach DO-NOT-CLOSE tags:

 (a)  P6 Panel
 1) CAPT PITOT HEAT IND
 2) F/O PITOT HEAT IND

 S 865-022
 (4)
Set the four WINDOW HEAT switches on the P5 overhead panel to OFF.

 S 865-026

 (5)  
Push and release one of the two master caution annunciator light panels (P7 lightshield).

 (a)  Make sure that the ANTI-ICE light on the annunciator panel is off.
 S 865-024
 (6)  Push and release one of the two MASTER CAUTION lights (P7
 lightshield).

 (a)  
Make sure that the two MASTER CAUTION lights are off.

 (b)  
Make sure that all annunciator lights on the P7 lightshield are off.

 S 715-025
 (7)  Do a check of the indication for the TAI pressure switch:
 (a)  
Disconnect electrical connector D2558 from the applicable TAI pressure switch.

 (b)  
Install a jumper between pins 1 and 2 of D2558. 1) Make sure that the applicable COWL ANTI-ICE light on the

 P5-11 module comes on. 2) Make sure that the two MASTER CAUTION lights come on. 3) Make sure that the ANTI-ICE light on the P7 lightshield
 comes on.
 (c)  
Push one of the two MASTER CAUTION lights. 1) Make sure that the two MASTER CAUTION lights go off. 2) Make sure that the ANTI-ICE light goes off. 3) Make sure that the COWL ANTI-ICE light stays on.

 (d)  
Push and release the ANTI-ICE light. 1) Make sure that the two MASTER CAUTION lights are on. 2) Make sure that the ANTI-ICE light is on.
　
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