BOEING 737
MAINTENANCE MANUAL

CHAPTER 75 TAB EFFECTIVE PAGES SEE LAST PAGE OF LIST FOR NUMBER OF PAGES CONTENTS 75 1 OCT 20/91 5202 FEB 20/87 5C8 75- 00 1 NOV 15/80 5152 JUN 20/85 515 75- 09-100 1 OCT 20/85 5C82 OCT 20/83 5A73 OCT 20/83 5C84 OCT 20/83 5C8 75- 09-100 101 OCT 20/85 5C8102 OCT 20/83 5C8 75- 09-100 501 OCT 20/85 5C8502 OCT 20/83 5C8503 OCT 20/83 5C8504 OCT 20/83 5C8 75- 09-111 401 OCT 20/85 5C8402 NOV 15/69 528 75- 11-0 1 MAY 15/72 5052 NOV 01/74 5113 AUG 15/69 5004 FEB 20/87 5E5 PAGE DATE CODE  75- 11- 21 (CONTINUED)402 NOV 15/67 500403 NOV 15/67 500404 BLANK 75- 11- 41 401 OCT 20/90 505402 JUN 20/87 505 75- 11- 51 401 OCT 20/91 500402 OCT 20/91 500403 OCT 20/91 500404 OCT 20/91 500 75- 11- 61 401 FEB 20/92 500402 FEB 20/92 500403 FEB 20/92 500404 BLANK 75- 21-0 1 MAY 15/68 5002 MAY 15/68 500 75- 31-0 1 OCT 20/83 5002 OCT 20/83 5003 OCT 20/83 5004 OCT 20/83 5005 OCT 20/83 5006 OCT 20/83 5007 OCT 20/83 5008 BLANK 75- 31-0 601 AUG 01/74 500602 MAY 01/00 500 75- 31- 01 401 FEB 20/87 500402 FEB 20/87 500 PAGE DATE CODE  PAGE DATE CODE  PAGE DATE CODE 
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CHAPTER 75
AIR
TABLE OF CONTENTS
Subject Subject No.
AIR.................................................................................................................................. 75-00 Description and Operation
ENGINE PROTECTION
ENGINE GRAVELPROTECTION SYSTEM.........................................................*[1] 75-09-100

Description and Operation
Engine Gravel Protection Boom
Engine Gravel Protection Pressure Switch
Engine Gravel Protection Valve

Trouble Shooting
Adjustment/Test

Engine Gravel Protection Valve..........................................................................*[1] 75-09-111 Removal/Installation
ENGINE ANTI-ICING
ENGINE AND NOSE COWL ANTI-ICING .................................................................. 75-11-0

Description and Operation
Engine Anti-Icing Air Valve
Engine Anti-Icing Air Orifice
Nose Cowl Anti-Icing Air Valve
Nose Cowl Anti-Icing Thermostatic Valve

Removal/Installation
Adjustment/Test
Inspection/Check

Engine Anti-Icing Shutoff Valve ............................................................................... 75-11-11 Removal/Installation
Nose Cowl Anti-Icing Shutoff Valve and Thermostatic Valve .................................. 75-11-21 Removal/Installation
Anti-Icing Air Rear Tube........................................................................................... 75-11-41 Removal/Installation
Anti-Icing Air Front Tube .......................................................................................... 75-11-51 Removal/Installation
ACCESSORY COOLING
GENERATOR COOLING............................................................................................ 75-21-0 Description and Operation
520 Oct 20/91 Contents 75 Page 1 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

Subject  Subject No. 
COMPRESSOR CONTROL 
COMPRESSOR BLEED SYSTEM ............................................................................. Description and Operation Inspection/Check  75-31-0 
Start Bleed Control Valve......................................................................................... Removal/Installation  75-31-01 
Pressure Ratio Bleed Control .................................................................................. Description and Operation Removal/Installation  75-31-11 
Pressure Ratio Bleed Control Metering Plug ........................................................... Removal/Installation  75-31-12 
*[1]  GJ ALL EXCEPT B-2509 and B-2510 

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Contents 75 Page 2  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Feb 20/87 

AIR -DESCRIPTION AND OPERATION
1.  General
A.  Engine compressor air is tapped for operating various engine accessories and airplane systems. Some bleed systems are basic with the engine as received from the engine manufacturer. Other engine bleed systems are installed by the airframe manufacturer. In addition to engine bleeds for accessory and system use, a compressor bleed system is incorporated to permit engine operational flexibility by allowing high compressor discharge air to bleed into the fan discharge duct.
　
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