(3)  
AMM 12-31-41/201, Body Section 48 Access Doors and Panels

 (4)  
AMM 12-31-61/201, Wing Lower Surface Access Doors and Panels

 (5)  
AMM 12-31-91/201, Nacelle and Engine-to-Fairing Access Doors and Panels

 (6)  
AMM 24-22-00/201, Manual Control

 (7)  
AMM 36-05-00/201, Pneumatic System

 (8)  
AMM 36-12-25/401, Bleed Air Precooler

 (9)  
AMM 49-52-11/401, APU Bleed Air Valve

 (10)
 AMM 71-11-04/201, Fan Cowl Panels

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 36-12-25
 ALL  ú ú 01.1 Page 505 ú Jul 12/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 C. Access
 (1)  
Location Zones
 101 Control Cabin, Left side
 102 Control Cabin, Right side
 212 Left Air-Conditioning Equipment Bay
 214 Right Air-Conditioning Equipment Bay
 502/503 Fan Cowls - Left Nacelle
 504/505 Thrust Reversers - Left Nacelle
 602/603 Fan Cowls - Right Nacelle
 604/605 Thrust Reversers - Right Nacelle
 701 Tail Compartment

 (2)  
Access Panels
 3303 Left side Air-Conditioning Access Panel
 3403 Right Side Air-Conditioning Access Panel
 4601L Aft Entry Door
 5737/5837 Fan Cowl Assy
 5738/5838 Thrust Reverser Cowl Assy
 5739/5839 Thrust Reverser Cowl Assy
 5746/5846 Fan Cowl Assy

 D. Procedure
 S 865-023
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-004

 (2)  
Put these switches on the P5-10 panel to OFF position:

 (a)  
BLEED 1

 (b)  
BLEED 2

 (c)  
L PACK

 (d)  
R PACK

 (e)  
WING ANTI-ICE

 (f)  
TRIM AIR

 (g)  
ENG 1 START

 (h)  
ENG 2 START

 S 025-010
 (3)  AIRPLANES WITH ASPIRATED TAT TUBE;
 Do the steps that follow:

 (a)  
Disconnect the aspirated TAT tube at the pneumatic manifold duct.

 (b)  
Put a cap on the open boss at the pneumatic manifold duct.

 (c)  
Put a cap on the open end of the aspirated TAT tube to keep unwanted material out.

 S 795-018
 (4)  To do a check for leakage on the right bleed air system, do these steps:
 (a)  
Put the APU BLEED switch to the ON position.

 (b)  
Make sure that the ISOLATION VALVE switch on the P5-10 panel is in the OPEN position (Fig. 501).

 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 36-12-25
 ALL  ú ú 01 Page 506 ú Mar 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 (c)  
Pressurize the pneumatic system with the APU
 (AMM 36-05-00/201).

 (d)  
When the bleed air duct pressure is stable, record the right duct pressure shown on the P5-10 panel.

 (e)  
Make sure that the right manifold is pressurized to a minimum of 20 psig.

 (f)  
At the same time on the P5-10 panel, put the ISOLATION VALVE switch to CLOSE and the APU BLEED switch to the OFF position.

 (g)  
Measure the time necessary for the right manifold duct pressure to decrease to 5 psi (INDICATOR END value) from one of the Duct Pressure Start values shown in the chart below.

 ~................................................... | DUCT PRESSURE| INDICATOR END | MINIMUM TIME PASS | | START (PSI) | (PSI) | (SEC) | ..................................................... | 50 | 5 | 7 | ..................................................... | 40 | 5 | 6 | ..................................................... | 30 | 5 | 5 | ..................................................... | 20 | 5 | 3 | 2..............…................…...................1