(2)  
AMM 49-11-00/201, Auxiliary Power Unit System

 C.  Prepare To Do the Operational Test With the APU
 S 865-054
 (1)  
Supply electrical power (AMM 24-22-00/201).

 S 215-055

 (2)  
Examine the oil levels of the Turbofans and the Air Cycle Machines.

 (a)  Make sure the oil levels are 3/4 of the distance to the top of their sight glasses.
 D.  Do the Operational Test
 S 825-056
 (1)  
Start the APU (AMM 49-11-00/201).

 S 865-057

 (2)  
Put these switches, on the P5-10 panel, to the position that follows:

 (a)  
ISOLATION VALVE - OPEN

 (b)  
1 BLEED - OFF

 (c)  
2 BLEED - OFF

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 (d)  APU BLEED - ON
 NOTE: Make sure the DUAL BLEED light, on the P5-10 panel,
____
 is not on.

 S 865-071
 (3)  Put the 2 BLEED switch to the ON position.
 (a)  Make sure these lights come on: 1) DUAL BLEED (1 Location), on the P5-10 panel. 2) MASTER CAUTION (2 Locations), on the P7 glare shield. 3) AIR COND annunciator on the P7 glare shield.
 S 865-094
 (4)  Put the LIGHTS switch, on the P2 panel, to the DIM position.
 (a)  Make sure the DUAL BLEED light dims.
 S 865-153
 (5)  Put the LIGHTS switch to the BRIGHT position.
 (a)  Make sure the DUAL BLEED light goes to BRIGHT.
 S 865-154
 (6)  Push and release one of the two MASTER CAUTION lights.
 (a)  
Make sure the MASTER CAUTION lights goes off.

 (b)  
Make sure the AIR COND annunciator light goes off.

 (c)  
Make sure the DUAL BLEED light stays on.

 S 865-063
 (7)  Push and hold one of the two master caution annunciators.
 (a)  Make sure all of the master caution annunciator lights are on.
 S 865-155
 (8)  Release the master caution annunciator.
 (a)  Make sure these lights are on:
 1) The MASTER CAUTION
 2) The AIR COND annunciator
 3) The DUAL BLEED

 S 865-156
 (9)  
Put the switch for the ISOLATION VALVE to the CLOSE position.

 (a)  Make sure these lights go off:
 1) The MASTER CAUTION
 2) The AIR COND annunciator
 3) The DUAL BLEED

 (10)
 Put the 2 BLEED switch to the OFF position.

 S 865-157
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 865-158
 (11) Put the 1 BLEED switch to the ON position.
 (a)  Make sure these lights come on:
 1) The MASTER CAUTION
 2) The AIR COND annunciator
 3) The DUAL BLEED

 S 865-159
 (12) Put these switches in the position that follows:
 (a)  
ISOLATION VALVE - OPEN

 (b)  
2 BLEED - ON

 (c)  
APU BLEED - OFF

 S 865-160
 (13) Make sure these lights go off:
 (a)  
The MASTER CAUTION

 (b)  
The AIR COND annunciator

 (c)  
The DUAL BLEED

 S 865-161
 (14) Put these switches in the position that follows:
 (a)  
1 BLEED - OFF

 (b)  
2 BLEED - OFF

 (c)  
ISOLATION VALVE - AUTO

 S 825-071
 (15) Stop the APU (AMM 49-11-00/201).
 TASK 36-11-05-735-072
 7.  Bleed Air Control System - System Test______________________________________
　
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