(e)
Put the wing jacks and the nose jack close to, but not below, the airplane in position for installation when the airplane is to the correct jack height.
CAUTION: DO NOT PERMIT THE JACKSCREW TO EXTEND MORE THAN THE
_______ APPROVED EXTENSION ON THE PLACARD. IF YOU EXTEND THE JACKSCREW TOO FAR, YOU CAN CAUSE DAMAGE TO THE JACK AND THE AIRPLANE.
(f) Turn the inner screw to keep a 3 inch clearance between the jack and the jack pad before you apply pressure to the jack.
S 942-013
(13) Move all the aerostands, ladders, jacks, work platforms, and entry stands out of the area that are not necessary.
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747-400
MAINTENANCE MANUAL
STABILIZING WING TIP JACK VII - LEFT VIII - RIGHT
I II III IV V VI VII VIII
PRIMARY TAIL
STABILIZING
JACK POINT
WING JACK III
IV - LEFT
V - RIGHT
JACKING POINTS
LEFT BODY RIGHT BODY TAIL (AFT FUSELAGE) LEFT WING RIGHT WING NOSE LEFT OUTBD WING RIGHT OUTBD WING
PRIMARY BODY JACK POINTS I - LEFT II - RIGHT
LOCATION (BODY STA AND BUTTOCK LINE)
STA 993.0 WBL 127.5 STA 993.0 WBL 127.5 STA 2596.0 RBL 30 STA 1516.0 WBL 583 STA 1516.0 WBL 583 STA 400.0 RBL 60 STA 1681.5 WBL 932.6 STA 1681.5 WBL 932.6
NOTE: RBL = RIGHT BUTTOCK LINE; WBL = WING BUTTOCK LINE
Jack Points Data Figure 204
STABILIZING NOSE JACK POINT VI
CONTROL (JACK NOT CONSOLE SHOWN) (OPTIONAL)
MAX STATIC LOAD IN POUNDS (KG)
200,000 (90,700)
200,000 (90,700) 96,800 (43,900) 30,000 (13,600) 30,000 (13,600) 39,400 (17,800) 25,000 (11,300) 25,000 (11,300)
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747-400 MAINTENANCE MANUAL
S 862-014
WARNING: MAKE SURE THAT YOU PREPARE THE AIRPLANE FOR THE AIR MODE BEFORE
_______ YOU LIFT THE AIRPLANE ON JACKS. AUTOMATIC OPERATION OF AIRPLANE SYSTEMS IN THE AIR MODE CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(14) Do the "Prepare Safety-Sensitive Systems for Air Mode Simulation" task (Ref 32-09-02/201).
F. Lift the Airplane on Jacks.
NOTE: A person must be at each jack and at the plumb bob or
____ inclinometer. A person must be where they can see each jack and this person will coordinate the procedure. Make sure each person can speak to the coordinator through an interphone system.
S 582-015
(1) Lift the airplane on the jacks:
(a)
Put a person at each jack.
(b)
Put a person at the plumb bob in the right wheel well or at the wheel well inclinometer.
(c)
Put a person at the central control console if you will use a control console.
(d)
Supply an interphone to each person at each jack station, plumb bob or inclinometer station, control console operator (when applicable), and coordinator.
(e)
Supply power if it is necessary for the jacking system.
CAUTION: DO NOT IMMEDIATELY RELEASE THE BRAKES DURING A 10 KNOT
_______ WIND OR MORE. STOP UNTIL MOST OF THE AIRPLANE WEIGHT IS ON THE LIFTING JACKS. IF THE AIRPLANE MOVES IT CAN CAUSE DAMAGE TO THE AIRPLANE OR THE JACKS.
(f) Release the brakes.
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747-400 MAINTENANCE MANUAL
(g) Follow the manufacturer's instructions for the jacking system to lift the airplane.
NOTE: You will not put too much load on the primary jacks (two
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