BOEING 737
MAINTENANCE MANUAL

CHAPTER 80 TAB EFFECTIVE PAGES SEE LAST PAGE OF LIST FOR NUMBER OF PAGES CONTENTS 80 1 JUN 20/85 5352 BLANK 80- 11-0 1 FEB 15/67 5022 JUN 20/85 5C83 FEB 20/86 5134 FEB 15/77 5465 JAN 20/83 5A16 FEB 15/77 5466A MAY 01/75 5096B INT BLANK 7 SEP 20/82 5B68 OCT 20/86 5618A OCT 20/86 5058B INT BLANK 9 JAN 20/83 53410 JUN 20/85 50810A FEB 20/90 52810B OCT 20/84 50411 OCT 20/84 5B612 NOV 01/74 50813 JAN 20/83 5B614 JUN 20/83 501 80- 11-0 101 MAY 15/67 500102 MAY 20/82 5B6103 MAY 01/76 530104 FEB 20/86 5B6 80- 11- 11 201 MAY 15/67 500202 AUG 15/68 500 80- 11- 11 401 MAY 20/82 546402 FEB 15/77 546403 MAY 20/82 5B6404 BLANK 80- 11- 11 601 MAY 20/82 500602 MAY 20/82 500603 MAY 20/82 5A1604 BLANK 80- 11- 21 401 JUN 20/85 505402 MAY 20/82 5B6403 AUG 01/74 530404 BLANK PAGE DATE CODE  80- 11- 23 401 JUN 20/85 501402 JUN 20/85 501 80- 11- 31 401 OCT 20/85 502402 OCT 20/86 513 80- 11- 41 401 MAY 20/82 593402 FEB 01/76 513 PAGE DATE CODE  PAGE DATE CODE  PAGE DATE CODE 

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CHAPTER 80
STARTING
TABLE OF CONTENTS
Subject Subject No.
CRANKING
PNEUMATIC STARTING SYSTEM............................................................................ 80-11-0

Description and Operation
Pneumatic Starter
Starter Valve

Trouble Shooting
Pneumatic Starter .................................................................................................... 80-11-11

Maintenance Practices
Preservation
Depreservation

Removal/Installation
Inspection/Check
Starter Valve ............................................................................................................ *[1] 80-11-21
Removal/Installation ............................................................................................. *[2] 80-11-23

Starter Valve Filter ................................................................................................... 80-11-31 Removal/Installation
Starter Turbine Wheel Containment Assembly........................................................ 80-11-41 Removal/Installation
*[1] Start valve open light pressure switch attached to starter valve *[2] Start valve open light pressure switch located on engine flange G
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PNEUMATIC STARTING SYSTEM - DESCRIPTION AND OPERATION
1. General
A.  The pneumatic starting system provides means for rotating the engine to the rpm range where starting can be accomplished when fuel and ignition are supplied.
B.  The system consists of two pneumatic starters two starter valves, and the associated pneumatic plumbing. It is controlled by two start switches, located on the forward overhead panel. For component location, (see Fig. 1).
C.  With air pressure in the pneumatic manifold, actuating the engine start switch will supply electrical power to open the starter valve. Low pressure air acts on the turbine blades of the pneumatic starter causing it to rotate. Rotation of the starter is transmitted to the N2 compressor through the accessory drive gear system. When the engine has accelerated to starting speed, application of fuel and ignition, by advancing the start lever, result s in the engine starting. For engine start procedure, see Chapter 71, Power Plant. At starter cutout speed, electrical power is interrupted mechanically, the starter valve closes, and the starting cycle is ended.
D.  The pneumatic starting system can use low pressure air from three separate sources. Normally, the engines are started with bleed air from the auxiliary power unit (APU). Secondly, the low pressure air can be obtained from a ground source through the ground pneumatic connection (See Fig. 1). The third source of low pressure air is the cross-bleed air from an operating engine. The cross-bleed starting is not desirable because the operating engine must operate at approximately 80% power setting to develop adequate air pressure for starting the other engine.
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