(c)
Make sure each inner cylinder has a minimum extension of 1 inch (25.4mm) of chrome for each shock strut (nose and main gears).
(d)
Read the pressures from the pressure gages on the shock struts.
NOTE: The pressure gages on the shock struts can be
____ sufficiently accurate for the strut servicing. But, you can use the gages on the servicing equipment for more accuracy.
(e)
Calculate the pressure differences for the shock struts on the main landing gear.
(f)
Make sure the pressure differences are not more than the values in the table.
~...................................................... | LANDING GEAR | MAXIMUM PRESSURE DIFFERENCE (PSI) | ........................................................ | Wing gear | 150 | | Body gear | 150 | | All Main Gear | 400 | 2................….....................................1
S 203-055
(2)
If the airplane has all the conditions given above, permit the airplane to dispatch.
S 613-016
(3)
If the airplane does not have all the conditions given above after the first fast check, do these steps:
(a) Add or release pressure to the necessary shock struts to get them to a point in the servicing band (Refer to the applicable shock strut servicing placards).
NOTE: Do not permit a shock strut to have less than 1 inch (25.4mm) of extension (visible chrome), measured from the lower surface of the shock strut outer cylinder.
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747-400 MAINTENANCE MANUAL
(b) Do the fast check again for each landing gear.
S 363-057
(4) If the airplane does not have all the conditions given above after the second fast check, add air to or release air from the strut to get them to a point in the servicing band (Refer to the applicable shock strut servicing placards).
NOTE: This step is to permit the dispatch of the airplane for
____ one flight to a station where the shock strut servicing equipments are available.
TASK 12-15-03-703-016
4. Wing Landing Gear Pressure/Extension Check (Fig. 301)
__________________________________________
A. General
(1) You can do a check of the fluid in the shock strut without the removal of fluid from the strut. The pressure and the extension of the shock strut at different airplane weights gives an indication of the fluid level. You must use the servicing chart to see if the strut is serviceable.
B. Access
(1) Location Zone
735 Wing Landing Gear, LH
745 Wing Landing Gear, RH
C. Procedure
S 863-019
(1) Make sure the airplane is empty.
NOTE: For this check, the landing weight of the airplane is
____ sufficient for the empty condition.
S 723-017
(2) Do a check of the landing gear pressurization with the airplane empty:
(a) Measure the pressures and the extensions of the shock struts on the wing landing gear.
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747-400 MAINTENANCE MANUAL
(b)
Compare the pressures and extensions to the band on the servicing chart.
(c)
Find the intersection of the pressure and dimension X on the servicing chart. 1) Add or release gas until the pressure and dimension X are
in the servicing band.
S 863-020
(3) Put a load on the airplane.
NOTE: For the best precision, the full weight of the airplane must
____ be 200,000 pounds more than the empty weight of the airplane. The temperature difference between the times you measure the data must not be more than 20°F.
S 723-023
(4) Do a check of the landing gear pressurization with a full load of weight and fuel in the airplane:
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