757
MAINTENANCE MANUAL
WARNING: LOOSEN THE AIR VALVE NUT TWO TURNS MAXIMUM, AND LET THE
_______ STRUT DEFLATE FULLY. DO NOT REMOVE THE AIR VALVE BODY ON A SHOCK STRUT WHEN IT PRESSURIZED. IF YOU LOOSEN THE AIR VALVE BODY, THE PRESSURE CAN CAUSE THE VALVE TO BLOW OUT OF THE SHOCK STRUT. INJURY TO PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
(d) Loosen the air valve nut, two full turns. Let the shock strut deflate fully.
NOTE: Put a flexible hose on the air valve and put the other
____ end in a container. This will catch the hydraulic fluid that comes out.
(e)
After the shock strut is fully deflated, open the air valve fully.
(f)
If the hydraulic line installation for the landing gear has disconnects at the brackets, disconnect them. These brackets are attached to the upper and lower torsion link attach points. Disconnect the upper and lower brackets as shown in Figure 204. Move the hoses as necessary to permit the installation of the lock equipment for the strut lock.
NOTE: If the routing of the hydraulic lines installation is
____ around the apex joints of the torsion links, these procedures are not necessary.
(g)
Remove the torsion link upper and lower attach pins.
(h)
Install the lock equipment for the shock strut. Follow the instructions supplied with the tool to lock the strut in a compressed position.
S 492-014
(7)
Put wheel chocks on all landing gear wheels to prevent the forward and aft movement before the jacks are set.
S 492-013
(8)
Install the jack adapters as shown in Figure 202.
(a) Remove the two plug bolts and the four Hi-Torque bolts from the forward body jack point. These bolts are a removed to permit the installation of the forward body jack adapter.
S 092-015
(9) Make sure the area is clear of persons, work platforms, entry stands, and other support equipment that are not necessary.
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07-11-01
ALL ú ú 01 Page 205 ú May 28/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
TASK 07-11-01-582-016
3. Lift the Airplane with the Jacks________________________________
A. Lift the Airplane
S 582-017
(1) Do the steps that follow to lift the airplane on jacks:
(a)
757-200 AIRPLANES; When jacking an airplane, make sure you stay within the airplane jacking system specifications, Figure 201.
(b)
Put one person at each jack and one person at the plumb bob in the wheel well. Make sure there is interphone communication between them and the coordinator for the jack procedures.
(c)
Put the primary jacks directly below the jack pads at points A, B, and C as shown in Figure 202.
(d)
Put the stabilizing jack near (not below) the airplane at jack points D, as shown in Figure 202. Install the stabilizing jack after you get the necessary airplane height with the primary jacks.
NOTE: It is the airline's decision if the stabilizing jack is
____ necessary when the airplane is in the hangar (no wind). Also, it is their decision to use the stabilizing jack with the CG in limits and there are a minimum number of persons in the aft end of the airplane.
(e)
Make sure the jacks are level.
(f)
Operate the primary jacks to set the jacks in the jack pads. Refer to the jack manufacturers' instructions.
(g)
Remove the wheel chocks.
WARNING:_______MONITOR THE NOSE JACK POINT LOAD WHEN TAIL JACKING. HIGH TAIL JACK LOADS CAN OVERLOAD THE NOSE JACK POINT AT HIGH JACKING WEIGHTS AND FORWARD CENTER OF GRAVITY LOCATIONS. LOCAL JACK LOADS MUST NEVER EXCEED DESIGN LIMITS. IF YOU DO NOT FOLLOW THIS INSTRUCTION, INJURIES TO PERSONS AND DAMAGE TO THE AIRPLANE AND EQUIPMENT CAN OCCUR.
(h)
Lift the airplane with the jacks. Continuously monitor the jacks and make sure that the maximum jack point loads are within the design limits. Also, monitor the plumb bob to make sure the airplane stays level while it is lifted on jacks.
(i)
If it is necessary, put the stabilizing jack directly below the jack adapter at jack point D. Use the manufacturer's instructions and lift the jacks until you get the specified loads.
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