A 737-300/400/500MAINTENANCE MANUAL
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 R = REVISED, A = ADDED OR D = DELETED CHAPTER 54 F = FOLDOUT PAGE EFFECTIVE PAGES 17 B PAGE 2 JUL 12/02 LAST PAGE

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 CHAPTER 54 - NACELLES/PYLONS
 TABLE OF CONTENTS
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 Subject
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NACELLES AND PYLONS
___________________
 NACELLES/PYLONS
_______________ Description and Operation
NACELLE STRUT
_____________ Description and Operation Removal/Installation Adjustment/Test Inspection/Check
PINS - NACELLE STRUT ATTACH Removal/Installation Inspection/Check
NACELLE STRUT - DRAIN TUBE AND SEALANT Inspection/Check Heat Shield Assembly Drain Check
 Remove All Blockage From The
Heat Shield Assembly Drain
 Remove All Blockage From The
Strut Midspar Closeout Web
 Remove All Blockage From The

Strut Midspar Drain Remove All Blockage From The System Disconnect Box Drain Strut Midspar Closeout Web
Drain Check Strut Midspar Drain Check System Disconnect Box Drain
Check TUBE - NACELLE STRUT DRAIN Removal/Installation
AUXILIARY STRUCTURE
___________________
 Description and Operation Access Panels Fairings PANELS - NACELLE STRUT ACCESS
Removal/Installation FAIRING - FORWARD Removal/Installation
Chapter SectionSubject
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Effectivity
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 54-CONTENTS

 BBEJ Page 1 Jul 15/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 CHAPTER 54 - NACELLES/PYLONS
 TABLE OF CONTENTS
_________________
 Chapter Section Subject_______ Subject ____ Effectivity
_______ Page ___________
 FAIRINGS - AFT 54-32-02 Removal/Installation 401 ALL DOOR - FORWARD FAIRING PRESSURE 54-33-01 RELIEF
 Maintenance Practices 201 ALL Adjust Door 210 Install Door 209 Install Latch 207 Latch Free Play Adjustment 211 Latch Release Test 201 Remove Door 208 Remove Latch 207
 ATTACH FITTINGS 54-40-00
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 ENGINE ATTACH FITTING 54-42-00
 Description and Operation 1 ALL
 FITTING - THRUST REVERSER HINGE 54-42-13

 Maintenance Practices 201 ALL MOUNT - AFT ENGINE 54-42-11 Maintenance Practices 201 ALL MOUNT - FORWARD ENGINE 54-42-12 Maintenance Practices 201 ALL
 FAIRINGS 54-50-00
________ FAIRINGS 54-51-00 FAIRING - INBOARD FLAP OUTBOARD 54-51-01 TRACK Maintenance Practices 201 ALL STRUT INSULATION BLANKETS 54-52-00 Maintenance Practices 201 ALL Firewall and Fireseal 201 Examination Approved Repairs 801 ALL

 54-CONTENTS

 BBEJ Page 2 Nov 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 NACELLES/PYLONS - DESCRIPTION AND OPERATION
___________________________________________
 1.  General_______
 A.  The engines are attached to the wing with struts (pylons). The strut is a pathway for all the pneumatic, electric, fuel, and hydraulic connections to the engine. The strut transfers loads from the engine and thrust reverser to the wing.
 2.  Component Details_________________
 A.  Strut Structure (Fig. 1)
 (1)  Struts are essentially frame and skin structures attached by fasteners to form a torque box. Strut skins are aluminum. Bulkheads, mid and lower spars are made of steel. Stainless steel or titanium is used where high strength, heat and fire resistance are required.
 B.  Struts are attached to the wing by means of the upper link between the strut upper spar and wing, the diagonal brace between the strut lower spar and wing, and the strut fittings connecting strut and wing directly. Side braces between strut midspar fittings and wing adds stability. Structural fuse pins or fuse bolts are used at the upper link, diagonal brace and midspar attach points.
 C.  Struts transmit engine loads to the wing. The engine is attached at the strut at the forward and aft engine mounts and the thrust link fitting. The forward and aft engine mount transmit vertical and thrust loads to the strut. Torsional loads are transmitted through thrust links connected between the engine fan frame and strut lower spar.
 D.  The engine and strut have outer skins which provide smooth airflow. The engine has a nacelle which is a streamlined enclosure. The nacelle consists of the inlet cowl, fan cowl, and thrust reverser. The strut has fairings which provide a smooth, contoured surface between the engine nacelle and wing.
　
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