BOEING 737
MAINTENANCE MANUAL

CHAPTER 9 TAB PAGE DATE CODE  PAGE DATE CODE  PAGE DATE CODE  PAGE DATE CODE 
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CONTENTS 9 1 FEB 20/87 5052 BLANK 9- 10-0 201 SEP 01/02 502202 FEB 01/95 5C9202A AUG 01/96 5C9202B BLANK 203 FEB 20/88 5B3204 FEB 20/89 510205 MAY 01/98 5A8206 NOV 15/77 502207 NOV 15/77 525208 OCT 20/90 500209 OCT 20/90 500210 FEB 01/95 502211 FEB 01/95 502212 BLANK 9- 13-0 201 FEB 15/77 501202 BLANK 9- 20-0 201 FEB 20/94 500202 OCT 20/88 500203 OCT 20/88 502204 OCT 20/88 501205 MAY 01/99 501206 OCT 20/88 501206A JUN 20/86 5C9206B JUN 20/86 5C9207 INT BLANK 208 MAY 01/98 500209 OCT 20/88 501210 OCT 20/88 5C9211 OCT 20/88 5C9212 OCT 20/88 5C9213 OCT 20/88 501214 BLANK 

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C8 CHAPTER 9 EFFECTIVE PAGES
SEP 01/02 PAGE 1

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D6-37115

CHAPTER 9 
TOWING AND TAXIING 
TABLE OF CONTENTS 
Subject  Subject No. 
TOWING......................................................................................................................... Maintenance Practices  9-10-0 
TOWING AIRPLANE WITH FLAT TIRES................................................................... Maintenance Practices  9-13-0 
TAXIING ......................................................................................................................... Maintenance Practices  9-20-0 

505 
Feb 20/87  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Contents 9 Page 1 

TOWING
1. General
A.  The airplane is normally towed or pushed by a tow bar attached to the nose gear. Maximum normal towing turning limits are indicated by painted stripes on the nose gear doors.
B.  The airplane is capable of being towed on firm and level terrain by the nose gear with one tire flat on each landing gear if starting loads are held to the minimum. For other abnormal towing loads, such as towing with two flat tires on one main gear, towing on soft terrain, towing up inclines greater than 5 degrees, the towing should be done from the main gears as the structural limitations of the nose gear may be exceeded.
NOTE:  With two flat tires on one main gear, effort should be made to replace one of the flat tires with a serviceable tire before towing to prevent excessive damage to the tires and wheels.
C.  Towing airplane with either or both engines removed presents no problem as long as the center of gravity remains forward of the aft center of gravity limits. Refer to par. 7 for center of gravity data.
D.  When it is necessary to tilt the airplane for tail clearance in hangars and storage areas, refer to 7-13-0, Tilt Airplane for Tail Clearance.
2.  Equipment and Materials
A.  Standard tow tractor
B.  Tow Bar –C09002 (-1,-2,-5,-10,12 and –13) –9 is replaced by –58 and F72951-51.
C.  Eyebolt Assembly, Main Landing Gear Towing - F72719
D.  Wire cable (3/4 inch) with end fittings to match F72719 and tow tractor (local fabrication)
E.  Steering depressurization valve lockout pin - F72735-13
3.  Prepare for Towing Airplane
A.  Check airplane is within center of gravity towing limitations and for fuel imbalance. Refer to par. 7 for center of gravity data.
B.  Check that all landing gear ground lock pins are installed (Ref 32-00-01).
NOTE: Towing or pushing with landing gear ground lock pins removed is optional.
C.  Tires and shock struts properly inflated (Ref Chapter 12).
CAUTION:  DO NOT TOW AIRPLANE WITH NOSE GEAR FULLY COLLAPSED OR EXTENDED MORE THAN 22 INCHES FROM BOTTOM OF INNER CYLINDER TO BOTTOM OF STEERING PLATE AS NOSE GEAR STRUT MAY BE DAMAGED INTERNALLY.
D.  Apply external electrical power or start and operate APU (Ref 24-41-0 or 49-11-0).
NOTE:  With external power applied or APU providing electrical power, parking brakes in parked position, and hydraulic system ground interconnect valve on (open), system B pump will pressurize both inboard and outboard brake accumulators A and B. If parking brakes are off, only outboard brake accumulator B will be charged and outboard brakes continuously pressurized.
Sep 01/02 9-10-0 Page 201 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

E.  Check that brake hydraulic pressure is normal, approximately 3000 psi.
F.  Check that antiskid switch is off.
G.  On airplanes without nose gear steering depressurization valve or if Lockout Pin is not installed.
(1)  
Check that hydraulic system A is depressurized.

NOTE:  If hydraulic system A is pressurized, system pressure prevents steering actuator bypass valve from opening, preventing nose gear from being turned by the tow bar. (Do not confuse system A pressure with brake accumulator A which pressurizes only the inboard brakes.)
　
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