NOTE: For this check, the landing weight of the airplane is
____ sufficient for the empty condition.
S 723-033
(5) 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.
(b)
Compare the pressures and extensions to the band on the servicing chart.
(c)
If it is necessary, add air to or release air from the strut to get a point on the servicing band.
S 863-034
(6) 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 723-035
(7) Do a check of the landing gear pressurization with a full load of weight and fuel in the airplane.
(a) Measure the pressures and extensions of the shock struts for each wing landing gear.
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747-400 MAINTENANCE MANUAL
(b) Compare the pressures and the extensions to the band on the servicing chart.
NOTE: If the point is on the servicing band, then the fluid
____ level is correct. If the point is on the right of the band, then the fluid level is too high. If the point is on the left of the band, then the fluid level is too low.
S 613-036
(8) Perform a full servicing (Ref. "Wing Landing Gear Shock Strut Servicing" task) or add hydraulic fluid level to the full level (Ref. "Pressure/Extension Check" task) if the hydraulic fluid level is not correct.
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747-400 MAINTENANCE MANUAL
BODY LANDING GEAR SHOCK STRUT - SERVICING
_________________________________________
1. General_______
A. This procedure contains 3 tasks:
(1)
The full servicing for the shock strut on the body landing gear
(2)
A fast check of the servicing for all of the main landing gear
(3)
A task to measure the fluid level in the shock strut without the removal of the fluid (pressure/extension check).
B. There is no easy procedure to do a check of the fluid level in the shock strut. The volume of the fluid changes when you pressurize the shock strut with nitrogen or dry air. You must do the full servicing procedure to accurately fill the shock strut.
C. On the pressure gages for the shock struts, the vendor bends the indicator during calibration. A gage with a bent indicator is usually satisfactory.
TASK 12-15-04-613-001
2. Body Landing Gear Shock Strut Servicing (Fig. 301)_______________________________________
A. General
(1)
This task has the instructions to fill and pressurize a shock strut of the body landing gear. This procedure has the same data that is on nameplate and the servicing placard on the shock strut.
(2)
Each shock strut of the body gear contains approximately 12.5 gallons of hydraulic fluid. When the shock strut is full of fluid, you must pressurize it with nitrogen or dry air.
(3)
If only small quantities of fluid are necessary, you can use fluid without lubricant to fill the shock strut. If large quantities are necessary, add lubricant to the shock strut. As an alternative, you can use a fluid which has an added lubricant.
B. Special Tools and Equipment
(1)
3MIT65B00163-1 - Landing Gear Struts Service Manifold Assembly
(2)
F70200-14 - Strut Inflation Tool
C. Standard Tools and Equipment
(1)
Clean, nitrogen or dry air source - 2000 psi with pressure gages
(2)
Clean container with graduations - 50-ounce minimum capacity
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