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757
MAINTENANCE MANUAL

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757
MAINTENANCE MANUAL

 CHAPTER 08 - LEVELING & WEIGHING

 TABLE OF CONTENTS_________________
 Chapter
 Section
 Subject_______  Subject_______  Page____  Effectivity___________
 LEVELING AND WEIGHING_____________________ 08-00-00
 LEVELING________ 08-20-00
 LEVELING  08-21-00
 Maintenance Practices  201  ALL
 WEIGHING________ 08-30-00
 WEIGHING  08-31-00
 Maintenance Practices  201  ALL

 08-CONTENTS

 GUN Page 1 Dec 20/96

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757 MAINTENANCE MANUAL

 LEVELING - MAINTENANCE PRACTICES
________________________________
 1.  General_______
 A.  The level indicator for the airplane is a plumb bob leveling scale. It is attached to the keel beam in the right main wheel well (Fig. 201). This indicator is used with a plumb bob attached to a fitting above the scale. It is used to level the airplane for general maintenance.
 B.  For small adjustments to make the airplane level, the landing gear shock struts are inflated or deflated as necessary. For larger adjustments, the airplane must be lifted on jacks.
 C.  To accurately level the airplane for symmetry checks, see the Structural Repair Manual, SRM 51-50-00.
 D.  Procedures to weigh the airplane are included in the airplane Weight and Balance Manual.
 TASK 08-21-00-582-001

 2.  Leveling the Airplane_____________________
 A.  Equipment

 (1)  
Door Locks, Landing Gear - (AMM 32-00-15)

 (2)  
Plumb bob and applicable cord - commercially
 available

 B.  References

 (1)  
AMM 07-11-01/201, Jacking Airplane

 (2)  
AMM 10-11-01/201, Normal Parking

 (3)  
AMM 12-15-01/301, Main Gear Shock Strut

 (4)  
AMM 12-15-02/301, Nose Gear Shock Strut

 (5)  
AMM 32-00-15/201, Landing Gear Door Locks

 (6)  
AMM 32-00-20/201, Landing Gear Downlocks

 C.  Prepare to Level the Airplane
 S 582-002

 (1)  
Park the airplane in a level position. The airplane must be very level before you do this procedure (AMM 10-11-01).

 S 492-003

 (2)  
Make sure the downlocks are installed on the nose and main landing gear (AMM 32-00-20).

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 08-21-00
 ALL  ú ú 01 Page 201 ú Dec 20/95
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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757
MAINTENANCE MANUAL

PLUMB BOB

SEE

PLUMB BOB
A-A

ATTACH FITTING

Airplane Plumb Bob and Leveling Scale
Figure 201

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
 08-21-00

 ALL  ú ú 01 Page 202 ú Dec 15/82
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757 MAINTENANCE MANUAL
 S 492-004

 WARNING: USE THE PROCEDURE IN AMM 32-00-15/201 TO INSTALL THE DOOR
_______ LOCKS. THE DOORS OPEN AND CLOSE QUICKLY AND CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (3)  Open the doors for the landing gear and install the door locks (AMM 32-00-15).
 D. Procedure
 S 482-005

 (1)  
Hang the plumb bob on the fitting that is attached in the right main wheel well (Fig. 201). The plumb bob fitting bracket is attached to the keel beam structure, directly above the leveling scale.

 S 822-006

 (2)  
Look at the position of the plumb bob when it has stopped its movement. When the plumb bob is not over zero degree mark on the leveling scale, make the airplane level. Use one of the procedures that follows:

 (a)  Inflate or deflate the applicable landing gear shock struts until the plumb bob is at zero degrees. 1) Adjust the shock strut of the main landing gear as
　
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