C.  The airplane at any gross weight between 300,000 and 474,000 pounds may be raised or lowered using primary jack points provided CG is maintained. The airplane may be supported or stabilized on jacks at weights equivalent to a basic airplane (350,000 pounds) plus full inboard main tanks (at 7 pounds per gallon), so long as individual jack point loads and CG locations are not exceeded. This provides for adding weight after airplane has been raised to permit simultaneous maintenance procedures, such as fuel tank leak checks and major component removal. At any weight, the airplane center of gravity must be within the forward and aft limits before you jack.
 NOTE: Fuel can be transferred between tanks (or wings) to help control
____
 the center of gravity.

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747-400 MAINTENANCE MANUAL
 CAUTION:_______MAXIMUM LOAD ON AN AXLE JACK POINT MUST NOT BE EXCEEDED. TO DO SO MAY CAUSE DAMAGE TO THE AIRPLANE.
 D.  Axle jack points are designed to permit changing two flat tires on the same landing gear while airplane is at maximum taxi weight.
 E.  Immediately after you jack the airplane to desired height, primary jacks are locked and stabilizer jacks are installed with each preloaded from 16,000 to 24,000 pounds.
 NOTE: At the operator's discretion, stabilizing jacks need not be used
____ if there is no wind, airplane gross weight does not exceed 474,000 pounds, CG is within limits, and the number of people on each wing is kept to a minimum with the difference in number on each wing not to exceed 10.
 F.  For specific jack procedures refer to 07-11-01/201.
 G.  For specific jack procedures of an asymmetric airplane due to component removal refer to 07-11-07/201.
 H.  Jack and dejack may be accomplished under wind conditions up to 30 knots. The wing flaps may be in any position for jacking and dejacking.
 I.  Wingtip jacks must be removed when winds greater than 20 knots are forecast.
 J.  For wind velocities between 30 and 50 knots, the airplane can be supported using all jacks (except wing tip jacks) provided the airplane is tied down at the wing, nose, and tail jack locations. The airplane cannot be on jacks for wind velocities greater than 50 knots.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400 MAINTENANCE MANUAL
 JACK AIRPLANE - MAINTENANCE PRACTICES
_____________________________________
 1.  General_______
 A.  This procedure contains one task. The task is to lift the airplane on jacks.
 B.  The system to lift the airplane has three primary jack points and five stabilizing jack points. The primary jack points are at the left and the right wing to body junction (jack points I and II) and at the tail (jack point III). Stabilizing jack points are at the nose (jack point VI), the center of each wing (jack points IV and V), and at each wing tip (jack points VII and VIII).
 TASK 07-11-01-582-001
 2.  Jack Airplane_____________
 A.  Special Tools and Equipment
 (1)
8ME65B01202-3 Body Gear Shock Strut Lock Assembly

 (2)
8ME65B01202-3 Wing Gear Shock Strut Lock Assembly

 (3)
6ME65B00161-1 Main Gear Ground Locks (four required)

 (4)
2ME65B01202-1 Nose Gear Ground Lock

 (5)
30MIT65B00112 Jack Adapter, Outboard Wing

 (6)
36MIT65B00141 Jack Adapter, Forward Body

 (7)
50MIT65B00112 Jack Adapter, Inboard Wing

 B.  Standard Tools and Equipment
 (1)
Wing and fuselage jacks

 (2)
Axle jacks

 (3)
Chocks - Wheel

 C.  References
 (1)
AMM 08-00-00/201, Leveling and Weighing
　
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