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BOEING 737
MAINTENANCE MANUAL

PAGE DATE CODE  PAGE DATE CODE  PAGE DATE CODE  PAGE DATE CODE 
49- 52- 32 (CONTINUED)503 MAY 01/99 551504 AUG 01/94 551 49- 52- 41 401 NOV 15/70 504402 SEP 20/82 504403 JUN 20/86 565404 BLANK 49- 52- 41 501 SEP 20/82 500502 BLANK 49- 52- 61 401 AUG 01/74 500402 AUG 15/76 501403 AUG 01/75 551404 BLANK 49- 52- 71 401 AUG 15/76 505402 AUG 01/74 501403 AUG 15/73 500404 BLANK 49- 52- 81 401 MAY 15/77 503402 AUG 15/73 500 49- 52- 81 501 FEB 01/96 501502 FEB 20/86 501503 FEB 01/96 501504 FEB 20/86 501505 FEB 20/86 501506 FEB 01/96 501507 JUN 20/86 501508 BLANK 49- 52- 91 701 AUG 01/95 501702 FEB 15/79 575703 AUG 01/95 501704 BLANK 49- 61-0 1 OCT 20/83 5402 OCT 20/83 5003 FEB 01/74 5404 FEB 20/86 5915 JUN 20/84 5906 BLANK 49- 61- 11 401 FEB 01/95 501402 FEB 01/95 501403 FEB 01/95 501404 BLANK 49- 61- 22 401 MAY 01/99 510402 FEB 01/96 540  49- 61- 22 (CONTINUED)403 FEB 01/96 501404 FEB 01/96 502 49- 61- 41 401 NOV 15/70 500402 NOV 15/70 501 49- 61- 51 401 NOV 15/70 500402 NOV 15/70 501 49- 61- 61 401 JAN 20/83 540402 FEB 01/74 540403 JAN 20/83 540404 BLANK 49- 70-0 1 MAY 15/67 5002 BLANK 49- 71-0 1 FEB 20/91 5002 FEB 15/73 5003 FEB 20/91 5404 FEB 20/91 500 49- 71-0 501 NOV 15/76 500502 AUG 01/94 500503 AUG 01/94 500504 JUN 20/83 500505 AUG 01/94 500506 BLANK 49- 71- 12 401 MAY 01/98 500402 MAY 01/98 500403 MAY 01/98 500404 BLANK 49- 71- 21 401 NOV 15/70 500402 FEB 20/91 540403 NOV 15/70 500404 BLANK 49- 71- 21 501 JUN 20/83 500502 BLANK 49- 72-0 1 MAY 15/67 5002 MAY 15/68 500 49- 72- 11 401 NOV 15/70 500402 NOV 15/67 500403 NOV 15/70 500404 BLANK  49- 81-0 1 OCT 20/93 5752 OCT 20/93 5243 OCT 20/93 5004 BLANK 49- 81- 11 401 OCT 20/93 508402 OCT 20/93 503403 OCT 20/93 510404 BLANK 49- 81- 11 601 MAY 01/99 501602 BLANK 49- 81- 11 701 NOV 15/69 500702 BLANK 49- 81- 21 401 MAY 15/80 501402 BLANK 49- 81- 31 401 OCT 20/93 524402 OCT 20/93 524403 OCT 20/93 524404 OCT 20/93 503405 OCT 20/93 503406 OCT 20/93 524407 OCT 20/93 524408 BLANK 49- 91-0 1 MAY 15/67 5002 FEB 01/75 5013 FEB 15/70 5264 FEB 15/79 513 49- 91- 11 301 JUN 20/83 500302 JAN 20/83 500303 NOV 15/70 500304 BLANK 49- 91- 11 401 MAY 15/78 502402 AUG 01/95 500403 FEB 20/86 514404 FEB 20/86 501405 AUG 01/95 500406 BLANK 49- 91- 11 501 MAY 15/78 501502 FEB 20/86 501 49- 91- 11 601 MAY 15/78 501602 BLANK  49- 91- 31 301 JAN 20/83 501302 FEB 15/73 514303 MAY 01/74 501304 MAY 01/74 504305 FEB 20/91 501306 BLANK 49- 91- 31 401 AUG 15/72 526402 AUG 15/72 514403 AUG 01/95 526404 NOV 15/70 504 49- 91- 41 401 NOV 15/70 500402 NOV 15/68 500403 AUG 01/95 500404 BLANK 49- 91- 51 401 AUG 01/94 500402 AUG 15/72 500403 AUG 01/95 500404 BLANK 49- 91- 61 601 AUG 01/75 501602 AUG 01/75 501 49- 94-0 1 NOV 15/80 5002 NOV 01/74 5113 AUG 15/72 5264 BLANK 49- 94- 11 401 AUG 01/95 518402 NOV 15/78 575403 NOV 15/70 526404 BLANK 49- 94- 21 401 AUG 15/72 501402 AUG 15/72 500403 AUG 15/72 500404 AUG 01/95 501 

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D6-37115

CHAPTER 49
AIRBORNE AUXILIARY POWER
TABLE OF CONTENTS
Subject Subject No.
AIRBORNE AUXILIARY POWER .................................................................................. 49-00 Description and Operation Trouble Shooting
POWER PLANT
APU POWER PLANT.................................................................................................. 49-11-0 Description and Operation Maintenance Practices
APU Fuel System Leak Check
APU Control Air Pressure Line Leak Check
Depreserve APU
Operate APU
Motor APU
Procedure Following Over-temperature During Start
Procedure to Remove and Install Tachometer-Generator Assembly
Purge APU Fuel System

Removal/Installation
Adjustment/Test
Test APU
Test Fuel Control Unit Acceleration Limiter Valve Cracking Pressure

(Opening)
Test APU Operation - NO LOAD
Test APU Operation - LOADED CONDITION
Test Bleed Air Valve Opening Rate

Inspection/Check
Approved Repairs
Deactivation (Removal of Inoperative APU from Airplane)
Reactivation (Reinstallation of APU in Airplane)

APU SHROUD ............................................................................................................ 49-12-0

Description and Operation
APU Shroud Drains
Drains
Lower Shroud
Upper Shroud

Cleaning/Painting
Upper Shroud........................................................................................................... 49-12-31 Removal/Installation
APU Shroud Latch ................................................................................................... 49-12-41 Adjustment/Test
　
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