(2)
When you do this seal replacement, the airplane gross weight must not be more than 564,000 pounds. And the center of gravity must be in the flight limits (15-33% MAC) with less than 20 knots wind velocity. The wind more than 20 knots can decrease the maximum approved gross weight of the airplane (Fig. 805). Do not replace the seals in the wind more than 50 knots. The wind velocity is independent of direction.
(3)
The airplane must have an clean condition (flaps retracted, zero stabilizer setting, and etc).
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747-400 MAINTENANCE MANUAL
WIND VELOCITY VS MAX. ALLOW. GROSS WEIGHT FOR REPLACEMENT OF MAIN LANDING GEAR LOWER SEALSWITH SPARE SEALS WITHOUT AIRPLANE JACKING
0 10 20 30 40 50
WIND VELOCITY - KNOTS MAXIMUM WIND
VELOCITY
Wind Velocity VS Gross Weight Chart
Figure 805
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747-400
MAINTENANCE MANUAL
(4)
The subsequent procedure has the seal replacement on the shock strut for the left body landing gear. For the seal replacement on the shock strut for the right body landing gear, do the equivalent operations.
(5)
This procedure gives the removal of the lower bearing for the shock strut with the puller. An optional procedure is to increase the pressure on the shock strut with nitrogen or dry air. Approximately 100 psi of pressure is necessary to remove the lower bearing. The special tool is not necessary for this procedure but it is necessary to follow the safety precautions.
B.
Special Tools and Equipment
(1)
MIT65B01201 Lower Gland Nut Wrench Adapter
(2)
G32011-1 - Oversize Gland Nut Wrench Adapter (Airplanes with oversize gland nut)
(3)
7MIT65B01211-1 Lower Gland Seal Split Guide
(4)
21MIT65B01211-1 Gland Seating Tool - BG, WG, NG
(5)
2MIT65B01201 Lower Bearing Seal Retainer Puller
C.
Standard Tools and Equipment
(1)
Hydraulic source can supply independently fluid at 2000 psi to three location at the same time.
(2)
Plastic tool to cut seal ring, commercially available
(3)
Drip tray with 15-gallon minimum capacity, commercial available
D.
Consumable Materials
(1)
D00589 Lubricant Hydraulic Assembly AFS-682 (Preferred)
(2)
D00250 Petrolatum VV-P-236 (Optional)
(3)
D00070 Petroleum Base Hydraulic Oil - MIL-H-5606
(4)
D00196 Hydraulic Fluid - BMS 3-11, Type IV, Class 1
(5)
G01395 Compound - Corrosion Inhibition, BMS 3-27, Mastinox 6856K
E.
References
(1)
AMM 07-11-03/201, Jacking Airplane Axles
(2)
AMM 09-11-00/201, Towing
(3)
AMM 12-15-03/301, Wing Landing Gear Shock Strut
(4)
AMM 12-15-04/301, Body Landing Gear Shock Strut
(5)
AMM 12-15-05/301, Nose Landing Gear Shock Strut
(6)
AMM 29-11-00/201, Main Hydraulic Supply System
(7)
AMM 32-00-30/201, Landing Gear Door Locks
(8)
AMM 32-13-02/301, Body Landing Gear Shock Strut
(9)
AIPC 32-13-01 Fig. 5
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747-400 MAINTENANCE MANUAL
(10)
AIPC 32-13-02 Fig. 2
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