Secondary Air Inlet Doors ........................................................................................ 71-11-41 Removal/Installation
Nose Dome .............................................................................................................. 71-11-51 Removal/Installation Approved Repairs
MOUNTS ........................................................................................................................ 71-20-0
Description and Operation
Cone Bolts
Vibration Isolators
Inspection/Check
AFT MOUNT Vibration Isolator ...................................................................................................... 71-21-11 Removal/Installation
Aft Cone Bolt............................................................................................................ 71-21-21 Removal/Installation
FORWARD MOUNT Vibration Isolator ...................................................................................................... 71-22-11 Removal/Installation
Forward Cone Bolt ................................................................................................... 71-22-21 Removal/Installation
507
Sep 20/81 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Contents 71 Page 3
POWER PLANT - DESCRIPTION AND OPERATION
1. General
A. The 737 airplane is powered by two JT8D turbofan engines mounted beneath the wings. Each engine is secured at three points to fittings which are designed to take thrust and side loads and allow for thermal expansion (Fig. 1). Access to the engine exterior components is provided by hinged removable side cowl panels, access doors within these panels, and removable fairing panels.
B. The major accessories fitted to each engine include a constant speed drive unit, a pneumatic starter and N1 and N2 tachometer generators. An ac generator is mounted on the constant speed drive unit. A hydraulic pump is installed on each engine. Fire detection and fire extinguishing systems are provided in each engine area (Fig. 2, 3, and 4).
C. The engine starting system provides a means of rotating the N2 compressor to establish a flow of air through the engine. Rotation of the N2 compressor also drives the engine fuel pump and fuel control, which meter fuel under pressure to the combustion chambers. An ignition system provides a high voltage discharge for igniting the air/fuel mixture. Each engine is fitted with a self-contained oil system to provide cooling and lubrication of engine gears and bearings. Transmitting devices, installed on each engine, actuate lights and indicators in the control cabin to provide indications of engine performance.
D. Air is bled from the low pressure and high pressure compressors and the fan discharge duct to operate various air plane systems. A thrust reverser, attached to the exhaust section of each engine, provides a means of retarding the forward speed of the airplane after touchdown.
E. A single compartment drain tank may be mounted on the bottom of the left cowl panel which previously collected fuel drained from the pressurizing and dump (P&D) valve (P&D valve drain port now plugged). The P&D valve drain system may be either disconnected and capped, or removed. Additionally on these engines, the drain tank and mast are not required and may be removed from the left cowl panel. On all engines, drainage from the oil tank scupper, and fluid leakage from the seals and drive pads of the engine accessories is collected and drained through a mast in the bottom of the left cowl panel. Fluids from the strut area are drained through tubing to a drain hole in the thrust reverser fairing.
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Aug 15/73 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 71-00 Page 1
Power Plant Attachment Points 5E4
71-00Page 2 Figure 1 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. May 01/98
510 Power Plant - Left Side View
Aug 15/73 Figure 2 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 71-00 Page 3
Power Plant - Right Side View 528
71-00 Figure 3 Nov 1/74
Page 4
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
500 Power Plant - Front View
Aug 15/77 Figure 4 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 71-00 Page 5
POWER PLANT (JT8D) - TROUBLE SHOOTING
1. General
A. This procedure is to be used on power plants reported for vibration.
2. Check Vibrating Engine Related Components
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