H28250
Airplane Leveling Using Attitude Gage 500
8-12-0 Figure 202 May 15/67
Page 202
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
D. Correct airplane attitude, proceeding until airplane is level along longitudinal axis.
(1)
For minor adjustments, the main and nose landing gear shock struts can be extended or retracted by inflation or deflation as required. Refer to 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 OVERPRESSURIZATION AND POSSIBLE INJURY TO PERSONNEL AND SERIOUS SHOCK STRUT DAMAGE. WITH SHOCK STRUT FULLY EXTENDED PRESSURE MUST NOT EXCEED 67 PSI IN MAIN GEAR (PART NO. 65-73761-1, -2, -3, -4) OR 78 PSI IN MAIN GEAR (PART NO. 65-73761-5, -6), OR 495 PSI IN NOSE GEAR.
(2)
For major adjustments place appropriate jack pad adapter and jack at jacking point C. Refer to Airplane Jacking, Chapter 7.
CAUTION: JACK MUST BE EQUIPPED WITH LOAD OR PRESSURE GAGE. DO NOT EXCEED JACKING POINT LOAD LIMIT.
(3)
Raise or lower jack until bubble in level vial is centered.
E. Place attitude gage in a position that is perpendicular to the airplane centerline. Ensure that both alignment tube tips are centered between the rows of rivets on the floor beams. The gage can now be used to measure the roll attitude of the airplane.
F. With pointer on zero adjust airplane attitude until bubble is centered in level vial.
(1)
For minor adjustments, the main landing gear shock struts can be extended or retracted. Refer to NOTE and WARNING following step D.(1).
(2)
For major adjustments place appropriate jack pad adapters and jacks at jacking points A and B (Ref steps D.(2) and D.(3)).
G. Repeat longitudinal and lateral leveling until level vial bubble is centered at both positions.
500
Feb 15/69 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 8-12-0 Page 203
WEIGHING
1. General
A. For detailed weighing procedures refer to Weight and Balance Control and Loading Manual. Preliminary weighing instructions and four weighing procedures are outlined in the manual.
B. Four equally accurate procedures for weighing the airplane may be used. They are:
(1)
Landing Gear Wheels, with Floor Scales
(2)
Main Landing Gear and Nose Gear Jack Points
(3)
Main Landing Gear and Forward Body Jack Points
(4)
Wing and Aft Body Jack Points
C. The procedure selected depends upon the type of equipment available, the cost of new equipment, and the projected demand for aircraft weighing.
D. If floor scales are available, use procedure (1). The airplane can be weighed in much less time with procedure (1) than with procedures requiring jacks.
E. Procedure (2) is preferred over the two procedures using wing or body jacking points because there will be less chance of structural damage to the airplane through failure of a supporting jack or weighing cell. Procedure (2) is more economical and less time consuming than procedures (3) or (4) because it does not require the installation of oleo locks.
500
May 15/67 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 8-20-0 Page 201
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