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747-400 MAINTENANCE MANUAL
S 212-130
(2)
Inspect the shock struts for leakage.
S 212-117
(3)
If you find leakage of the shock strut fluid on the inner cylinder, make sure the shock strut is serviceable:
(a)
Wipe the surface of the inner cylinder with a clean cloth to remove all of the fluid from the leak.
(b)
Monitor the inner cylinder where it meets with the outer cylinder for 15 minutes.
NOTE: If you do not find leakage on the inner cylinder, then
____ the shock strut is serviceable. If the leakage flows continuously from the seals, then the shock strut is not serviceable.
1) Make sure the extension of the inner cylinder does not change during this time. 2) Make a record of the number of drops which come from the seals during the 15 minutes. 3) Make a record of the location of the leak.
(c) Tow the airplane to cause movement between the inner cylinder and outer cylinder of the shock strut (AMM 09-11-00/201).
NOTE: The minimum distance the airplane must be moved is two
____
airplane lengths.
(d)
Wipe the surface of the inner cylinder again with a clean cloth to remove all of the fluid from the leak.
(e)
Monitor the inner cylinder where it meets with the outer cylinder for 15 minutes. 1) Make sure the extension of the inner cylinder does not
change during this time. 2) Make a second record of the number of drops which come from the seals during the 15 minutes.
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747-400 MAINTENANCE MANUAL
3) Make a record of the location of the leak.
(f) Calculate the average of the number of drops which came from the seals from both of the 15 minute measurements.
NOTE: If the average is less than 30 drops during the 15
____ minutes time, the shock strut is serviceable. If the leakage flows continuously from the seals or leakage is greater than 30 drops during the 15 minutes, then the shock strut is not serviceable.
S 212-148
(4) If the leakage stopped, do the step that follows:
CAUTION: A DEFLATED OR FLAT SHOCK STRUT CAN CAUSE DAMAGE DURING
_______ LANDING. IF THE AIRPLANE LANDED WITH A DEFLATED OR FLAT SHOCK STRUT, DO A HARD LANDING INSPECTION PER AMM 05-51-41/201 TO MAKE SURE THERE IS NO DAMAGE.
(a) Continue to monitor the shock strut for leakage on subsequent landings. If you see more signs of leakage, do the entire leak check procedure again.
S 612-147
(5) If there was leakage between 1 and 15 drops during the 15 minute period, do the steps that follow:
NOTE: 20 drops is equal to 1.0cc.
____
CAUTION: A DEFLATED OR FLAT SHOCK STRUT CAN CAUSE DAMAGE DURING
_______ LANDING. IF THE AIRPLANE LANDED WITH A DEFLATED OR FLAT SHOCK STRUT, DO A HARD LANDING INSPECTION PER AMM 05-51-41/201 TO MAKE SURE THERE IS NO DAMAGE.
(a) Continue to monitor the shock strut for leakage on subsequent landings. After 10 days service the shock strut with nitrogen and make sure the "X" dimension in the servicing chart is correct (AMM 12-15-04/301).
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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747-400 MAINTENANCE MANUAL
(b)
After 20 days deflate the shock strut and add oil until it is completely full. Then service the shock strut with nitrogen (AMM 12-15-04/301).
(c)
Do the 10 and 20 day servicing steps again until you change the seals.
S 612-149
(6) If there was leakage between 16 and 30 drops during the 15 minute period, do the steps that follow:
NOTE: 20 drops is equal to 1.0cc.
____
CAUTION: A DEFLATED OR FLAT SHOCK STRUT CAN CAUSE DAMAGE DURING
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