(e)
Nose Gear Tripod Braces
S 212-005
(4) Examine the nose gear wheel well area for buckling, flaking paint, cracks and fasteners which are not there.
NOTE: Look closely at the trunion support fittings and the
____
drag strut support fittings.
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(5) Measure the nose gear shock strut pressure (AMM 12-15-05/301).
S 612-008
(6) If nose gear shock strut pressure is less than 100 psi, pressurize
strut with air or nitrogen to 100 psi.
S 212-007
(7) Examine the nose gear shock strut upper and lower ends for signs of
fluid leakage. Repair or replace nose gear, as necessary.
NOTE:____ A small amount of fluid on the nose landing gear shock
strut inner cylinder is normal.
S 362-009
(8) If fluid leakage is found, do these steps as necessary:
(a)
Remove the air charging valve to make sure the nose gear shock strut is fully deflated.
(b)
Service the noes gear shock strut with fluid per the service chart and write down the volume of fluid used (AMM 12-15-05/301, AMM 32-21-02/301).
(c)
If more than 300 cubic inches of fluid (5 quarts) is used to service the nose gear shock strut, jack airplane nose (AMM 07-11-02/201).
(d)
With the air charging valve open, move the nose gear inner cylinder up and down through it's full stroke range. Listen for clunking noises and examine the nose gear inner cylinder to see inner cylinder binds or is unusually loose. Also, do a check of the fully extended "A" dimension per strut servicing chart | 0.20 inch. Repair or replace gear as necessary.
(e)
Remove the jacks (AMM 07-11-02/201).
S 612-010
(9)
Service the nose gear shock strut with air or nitrogen per servicing chart (AMM 12-15-05/301, AMM 32-21-02/301).
S 212-011
(10)
Pressurize hydraulic system No. 1 (AMM 29-11-00/201) and cycle nose gear steering left and right (FIM 32-51-00/101). Do a check for unusual noises, leaks or any other unusual conditions.
NOTE: Make sure the nose gear torsion links are connected.
____
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(11) If unusual conditions are found, including damage, deformation, cracks, buckling, etc, make an inspection for hard landing of the specific landing gear with the deflated shock strut and the area of the airplane adjacent to the deflated shock strut per:
(a) The Phase I and Phase II examination of the nose landing gear and the adjacent structure (AMM 05-51-05/201).
S 612-012
(12) If no unusual conditions are found, release the airplane for service. Do a check of the nose gear shock strut after several landings. Service the nose gear shock strut as necessary. Nose gear shock struts which are serviced continiously should be written down in the Maintenance Log.
NOTE: A small decrease in pressure is normal because the air
____ is absorbed in the oil. Oil and/or air leaks which are continiously serviced require a close examination. Repair or replace strut as necessary.
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747-400 MAINTENANCE MANUAL
ACID SPILLAGE CONDITION - MAINTENANCE PRACTICES
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