(9)  
AMM 71-11-04/201, Fan Cowl Panels

 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 865-028
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 865-029

 (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 025-030
 (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.

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A 737-300/400/500MAINTENANCE MANUAL
 S 025-031
 (4)  Open the applicable access doors and panels to examine the pneumatic duct sections for leakages.
 S 865-032
 (5)  Put the APU BLEED switch to the ON position.
 S 865-033
 (6)  FOR THE RIGHT BLEED AIR SYSTEM; Put the ISOLATION VALVE switch to the open position. (a) Pressurize the pneumatic system with the APU (AMM 36-05-00/201). (b) Examine the pneumatic duct sections from the isolation valve to the right Pressure Regulating and Shutoff Valve for leakages.
 NOTE:____ A small quantity of leakage is permitted from the joints. There must not be a high concentration of leakage from the leakage source.
 S 865-048
 (7)  FOR THE LEFT BLEED AIR SYSTEM; Put the ISOLATION VALVE switch to the closed position. (a) Pressurize the pneumatic system with the APU (AMM 36-05-00/201). (b) Examine the pneumatic duct sections from the APU bleed valve to the left Pressure Regulating and Shutoff Valve for leakages.
 NOTE:____ A small quantity of leakage is permitted from the joints. There must not be a high concentration of leakage from the leakage source.
 S 365-036
 (8)  Repair any high concentration of leakages.
 S 215-037
 (9)  If there are no concentrated leakages found, then examine the items that follow for leakage: (a) Flow Control Valve (b) Starter Valve (c) Wing Thermal AntiIce (TAI) Valve (d) Isolation Valve (e) Pressure Regulating and Shutoff Valve (f) Turbo Fan Valve (g) FOR RIGHT BLEED AIR SYSTEM; Ground Air Connector Check Valve

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (h)  
FOR LEFT BLEED AIR SYSTEM;
 APU Bleed Valve

 (i)  
FOR LEFT BLEED AIR SYSTEM;
 APU Check Valve

 S 795-038
 (10) If leakage was found and repaired, do the Bleed Air Leakage Test for the Left (or Right) bleed air system again.
 NOTE: Bleed system leakage level times that are below the
____ MINIMUM TIME PASS values are a problem only if the airplane shows a condition such as a split duct pressure, bleed trip and/or low cabin pressure.
　
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