S 582-004
(3)
Lift the airplane if you will operate all landing gear or in combinations not permitted in step E.(1)(b) (Ref 07-11-01/201).
E. Move the Landing Gear.
S 582-005
(1) Operate each landing gear or combination of gears with the
conditions that follow:
CAUTION: CORRECTLY SERVICE THE SHOCK STRUTS ON THE GEARS THAT WILL
_______ HOLD THE AIRPLANE. IF THE SHOCK STRUTS ARE NOT SERVICED CORRECTLY, YOU CAN CAUSE DAMAGE TO THE AIRPLANE.
(a)
Make sure the applicable shock struts are serviced correctly (Ref 12-15-03/301, 12-15-04/301, 12-15-05/301).
(b)
You can use a pit for gear maintenance on airplanes with weights of not more than 564,000 pounds (255,800 kg) with a CG in a usual flight range (14 to 33% Mean Aerodynamic Chord) for the gear combinations that follow: 1) The nose gear and the two body gears hold the airplane.
NOTE: The two wing gears will be above the pits.
____
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
07-11-06
ALL ú ú 01 Page 202 ú Jun 10/97
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
2) The nose gear, the two wing gear, and one body gear hold the airplane.
NOTE: The other body gear is above a pit.
____
(c) It is not desirable to move the airplane above a pit with the gear combinations that follow:
NOTE: This is because of more procedures that you must obey
____
and for limits which you must obey.
1) The nose gear and the two wing gear hold the airplane.
NOTE: The two body gear are above the pits.
____ If you lower both of the body gear into the pits, it would cause the aft end of the airplane to move down in the direction of the ground if the CG is more aft than approximately 24% MAC. If you must retract both body gear at the same time, hold the airplane with jacks. You must obey the maximum jacking weight limit and the applicable jack point limits.
2) The nose gear, the two body gear and one wing gear hold the airplane.
NOTE: The other wing gear is above a pit.
____ If you use one pit below a wing gear on one side only, the body gear on that side would have to much load because of its location relative to the airplane CG. It is possible this load will be more than the design vertical load limit on the gear. It is also possible the load would be higher than the tire rated load by too much.
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
07-11-06
ALL ú ú 01 Page 203 ú Feb 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
3) If you will operate one wing gear above a pit, remove the load on the opposite wing gear.
NOTE: With the two wing gear unloaded (one bled and the
____ other over the pit), the load on each body gear will be reduced to approximately one and one-half times tire rated load (564,000-pound [255,800-kg] gross weight airplane). In this condition, loads on each body gear will approximate normal rated tire load on a 400,000-pound (181,400-kg) gross weight airplane.
a) To remove the load on the opposite wing gear, bleed the air from the applicable shock strut of the wing gear.
NOTE: With the two wing gear not loaded (one bled and
____ the other over the pit), you will decrease the load on each body gear to approximately one and one-half times the tire rated load (564,000-pound [255,800-kg] gross weight airplane). In this condition, the loads on each body gear are approximately equal to the normal rated tire load on a 400,000-pound (181,400-kg) gross weight airplane.
b) An emergency alternative to removing the load on the opposite wing gear is to keep the airplane gross weight to a maximum of 400,000 pounds (181,400 kg).
NOTE: This weight will result in a tire load of
____ approximately one and one-half times static rating on the body gear on the same side of the airplane as the unloaded wing gear. The airplane will also move to a roll attitude of approximately 4 degrees.
中國航空網(wǎng) www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：747-400 AMM 飛機維護手冊 LIFTING AND SHORING(21)
