(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.
(f)
Compare the "X" dimension from the chart to the "X" dimension that you actually measured.
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757 MAINTENANCE MANUAL
(g)
If the actual measured "X" dimension is within the upper and lower limits of the "X" dimension from the chart, then do these steps to complete the check: 1) Tighten the swivel nut to 5 - 7 pound-feet to close the air
valve. 2) Remove the pressure gage from the shock strut. 3) Install the cap for the air valve.
(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 Fluid and Nitrogen Servicing to adjust the fluid level.
NOTE: If only one of the two pressure checks is satisfactory,
____ then the fluid volume is not correct.
(i)
Tighten the swivel nut to 5 - 7 pound-feet to close the air valve.
(j)
Remove the pressure gage from the shock strut.
(k)
Install the cap on the air valve.
TASK 12-15-02-613-029
4. Servicing of the Shock Strut with Nitrogen Only
_______________________________________________
A. Equipment
(1)
Strut Inflation Tool - F70200-14
(2)
Pressure Gage, 0 to 2000 PSIG - Commercially Available
B. Consumable Materials
(1)
Dry nitrogen (recommended), 2200 psi (commercially available)
(2)
Dry air (optional), 2200 psi (commercially available)
C. References
(1) AMM 07-11-02/201, Jacking Airplane Nose
D. Nitrogen Servicing - Airplane Not on Jacks
S 223-030
(1) Do these steps to service the shock strut with nitrogen:
(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.
CAUTION: 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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12-15-02
ALL ú ú 01 Page 306 ú Jan 28/02
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A
757 MAINTENANCE MANUAL
(f) Add nitrogen to the shock strut until the measured "X" dimension gets to the upper end of the limit of the "X" dimension from the chart.
NOTE: It is recommended to use the upper end of the limit to
____ allow for some leakage.
(g)
Tighten the swivel nut to 5 -7 pound-feet to close the air valve.
(h)
Remove the pressure gage from the shock strut.
(i)
Install the cap for the air valve.
E. Nitrogen Servicing - Airplane on Jacks
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