757
MAINTENANCE MANUAL
B. Equipment
(1)
Strut Inflation Tool - F70200-14
(2)
Pressure Gage, 250 to 2500 PSIG - Commercially Available
C. References
(1)
AMM 32-00-15/201, Landing Gear Door Locks
(2)
AMM 32-00-20/201, Landing Gear Down Locks
(3)
AMM 07-11-01/201, Jacking Airplane
D. Access
(1) Location Zones
731/741 Main Landing Gear
E. Prepare to Check the Hydraulic Fluid Level in the Shock Strut
S 493-021
(1) Make sure the downlocks are installed on the nose and main landing gear (AMM 32-00-20/201).
S 493-022
WARNING:_______OBEY THE INSTALLATION PROCEDURE FOR THE DOOR LOCKS. THE DOORS OPEN AND CLOSE QUICKLY. THE MOVEMENT OF THE DOORS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO EQUIPMENT.
(2) Open the doors for the landing gear and install the door locks (AMM 32-00-15/201).
NOTE: The doors for the main and nose landing gear open at the
____ same time when you use the ground release lever.
S 863-023
(3) Put the control lever for the landing gear in the OFF position and attach a DO-NOT-OPERATE tag.
F. Check the hydraulic fluid level of the shock strut for the main landing gear:
NOTE: If you think the strut fluid level is correct, then do the
____ Nitrogen Servicing Only task and adjust the nitrogen volume as necessary.
S 223-025
(1) Check the hydraulic fluid level with the airplane at the first shock strut extension:
(a)
Remove the cap from the air valve.
(b)
Install a pressure gage on the shock strut to measure the pressure. Use the instructions supplied with the tool.
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12-15-01
ALL ú ú 01 Page 306 ú May 28/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757
MAINTENANCE MANUAL
WARNING: LOOSEN THE NUT FOR THE AIR VALVE A MAXIMUM OF TWO TURNS.
_______ DO NOT REMOVE THE VALVE BODY ON A PRESSURIZED STRUT. AIR PRESSURE CAN BLOW THE VALVE OUT AND INJURE PERSONNEL.
(c)
Loosen the swivel nut for the air valve two turns and measure the pressure of the shock strut.
(d)
Measure the actual "X" dimension on the strut as shown on Fig. 302.
(e)
Use the chart on Fig. 302 to find the "X" dimension that corresponds to the pressure you measured.
(f)
Compare the "X" dimension from the chart to the "X" dimension that you actually measured.
(g)
If the actual measured "X" dimension is within the upper and lower limits of the "X" dimension from the chart, then do the steps for a pressure check at the second point.
(h)
If the actual measured "X" dimension is not within the upper and lower limits of the "X" dimension from the chart, then do the Nitrogen Servicing Only to get the measured "X" dimension within the limits. Then do the steps for a pressure check at the second point.
S 213-033
(2) Check the hydraulic fluid level with the airplane at the second shock strut extension:
NOTE: To get a different shock strut extension, you can have the
____ airplane at a different weight, or, if the airplane is lifted on jacks, you can use the airplane jacks or floor jacks to compress or extend the shock strut.
You should have a difference of 2 - 4 inches between the two shock strut extensions to do the check.
(a)
Remove the cap from the air valve.
(b)
Install a pressure gage on the shock strut to measure the pressure. Use the instructions supplied with the tool.
WARNING: LOOSEN THE NUT FOR THE AIR VALVE A MAXIMUM OF TWO TURNS.
_______ DO NOT REMOVE THE VALVE BODY ON A PRESSURIZED STRUT. AIR PRESSURE CAN BLOW THE VALVE OUT AND INJURE PERSONNEL.
(c)
Loosen the swivel nut for the air valve two turns and measure the pressure of the shock strut.
(d)
Measure the actual "X" dimension on the strut as shown on Fig. 302.
(e)
Use the chart on Fig. 302 to find the "X" dimension that corresponds to the pressure you measured.
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