BOEING 737
MAINTENANCE MANUAL
CHAPTER 8 TAB PAGE DATE CODE PAGE DATE CODE PAGE DATE CODE PAGE DATE CODE
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CONTENTS 8 1 FEB 20/87 5052 BLANK 8- 10-0 201 MAY 15/67 500202 BLANK 8- 11-0 201 JUN 20/88 501202 JUN 20/88 500203 MAY 15/67 500204 BLANK 8- 12-0 201 MAY 15/67 500202 MAY 15/67 500203 FEB 15/69 500204 BLANK 8- 20-0 201 MAY 15/67 500202 BLANK
* = REVISED, ADDED OR DELETED PAGE F = FOLDOUT PAGE
C8 CHAPTER 8 EFFECTIVE PAGES
MAY 01/99 PAGE 1
LAST PAGE
D6-37115
CHAPTER 8
LEVELING AND WEIGHING
TABLE OF CONTENTS
Subject Subject No.
LEVELING ...................................................................................................................... Maintenance Practices 8-10-0
LEVEL AIRPLANE USING PLUMB BOB ................................................................ Maintenance Practices 8-11-0
LEVEL AIRPLANE USING ATTITUDE GAGE ........................................................ Maintenance Practices 8-12-0
WEIGHING ..................................................................................................................... Maintenance Practices 8-20-0
505
Feb 20/87 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Contents 8 Page 1
LEVELING
1. General
A. The airplane can be leveled by using either a plumb bob, an attitude gage, or an engineer's transit.
B. For an alignment check of the airplane structure following repair or modification, a more accurate means of leveling is needed, such as an engineer's transit. For complete details on alignment checking, refer to the Structural Repair Manual Chapter 51, Alignment Check Procedure.
500
May 15/67 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 8-10-0 Page 201
LEVEL AIRPLANE USING PLUMB BOB
1. General
A. The plumb bob may be used for general airplane leveling, such as when the airplane is being jacked for weighing, general maintenance, gear retraction tests, etc.
2. Equipment and Materials
A. Plumb Bob and Cord
3. Level Airplane (Fig. 201)
A. Park airplane in most level position available.
B. Hang plumb bob from bracket marked LEVEL HERE in the right main wheel well. The bracket is directly above the leveling scale.
C. Check position of plumb bob after it has stopped swinging. If plumb bob is not over zero on the leveling scale, the airplane must be adjusted by jacking or oleo inflation until plumb bob is zeroed.
(1) For minor leveling adjustments, the main and nose landing gear shock struts can be extended or retracted by inflation to normal service band limits or deflation as required (Ref Chapter 12, Main Landing Gear Shock Strut Servicing and Nose Landing Gear Shock Strut Servicing).
WARNING: SHOCK STRUTS MUST NOT BE PRESSURIZED BEYOND NORMAL SERVICING LEVELS. TO DO SO CAN RESULT IN OVER PRESSURIZATION AND POSSIBLE INJURY TO PERSONNEL AND SERIOUS SHOCK STRUT DAMAGE.
501
Jun 20/88 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 8-11-0 Page 201
G53209
Airplane Leveling Using Plumb Bob 500
8-11-0 Figure 201 Jun 20/88
Page 202
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(2)
For major leveling adjustments, place appropriate jack pad adapters and jacks at jacking points A, B, and C. Refer to Airplane Jacking, Chapter 7.
CAUTION: ALL JACKS MUST BE EQUIPPED WITH LOAD OR PRESSURE GAGES. JACK POINT LOAD LIMITS MUST NOT BE EXCEEDED.
(3)
Raise or lower appropriate jack until plumb bob is centered over zero on leveling scale.
500
May 15/67 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 8-11-0 Page 203
LEVEL AIRPLANE USING ATTITUDE GAGE
1. General
A. The primary purpose of the attitude gage is to determine the correct attitude of the airplane on the ground prior to a fuel quantity check. The pitch and roll readings combined with dripstick readings will give accurate fuel quantities in the tanks. Refer to Chapter 28, Fuel Quantity Indicating System, for further information on dripstick readings. In this chapter, the attitude gage will be used to level the airplane while jacking.
2. Equipment and Materials
A. Airplane Attitude Gage, F70043
3. Level Airplane (Fig. 202)
A. Park airplane in most level position available.
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