(c)
Examine the main gearbox, the oil pump, and the oil tank for
oil leaks from the magnetic chip detectors (MCD) (Fig. 602).
NOTE: The shape of the MCD probe and the quantity of packings
____ can be different from what is shown in the Fig. 602.
1) If the leak comes from between the MCD probe and the MCD housing, replace the packing on the probe and, if applicable, the packing on the housing (AMM 79-21-10/401).
2) If the leak comes from between the MCD housing and the port, replace the packing on the housing (AMM 79-21-10/401).
(d) Examine the oil tank for leaks.
1) If there is a leak from the oil tank cap, do this task: "Cap Assembly Repair" (AMM 79-11-03/201).
S 216-004-N00
(6)
Examine the main gearbox for cracks.
(a)
If there are signs of oil leakage from a crack, replace the
engine (AMM 71-00-02/401).
(7)
Examine the main gearbox for signs of corrosion:
S 226-005-N00
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
WARNING:_______ DO NOT GET THE SOLVENT IN YOUR MOUTH OR EYES, OR ON YOUR
SKIN. DO NOT BREATHE THE FUMES FROM IT. PUT ON
PROTECTIVE SPLASH GOGGLES AND GLOVES WHEN YOU USE THE
SOLVENT. KEEP THE SOLVENT AWAY FROM SPARKS, FLAMES, AND
HEAT. THE SOLVENT IS POISONOUS AND FLAMMABLE AND CAN
CAUSE INJURY TO PERSONS AND DAMAGE TO EQUIPMENT.
CAUTION:_______ MAKE SURE YOU CLEAN ALL OF THE HYDRAULIC FLUID ON THE MAIN
GEARBOX. HYDRAULIC FLUID CAN CAUSE CORROSION ON THE
ALUMINUM GEARBOX HOUSING.
(a)
Use a cloth that is moist with the solvent to clean all the dried hydraulic fluid from the main gearbox.
(b)
Areas with corrosion that are less than 0.050 inch (0.127 mm) in depth are permitted.
(c)
The main gearbox is serviceable if the conditions that follow occur: 1) The corrosion goes below the surface less than 0.050 inch
(1.27 mm).
2) The corrosion goes below the surface 0.050 inch (1.27 mm) and not deeper. a) The area of the corrosion is less than 1.00 square inch
(645 square mm). b) The area with corrosion is more than 2.00 inches
(50.80 mm) away from other corrosion.
3) If the corrosion is worse than these conditions, replace the engine (AMM 71-00-02/401).
S 616-006-N00
(8) Fill the engine oil if you drained the oil (AMM 12-13-03/301).
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WARNING: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO CLOSE THE THRUST
_______ REVERSERS. IF YOU DO NOT OBEY THESE INSTRUCTIONS, INJURIES TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
(9) Close the thrust reversers (AMM 78-31-00/201).
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S 416-016-N00
(10)
Close the core cowl panels (AMM 71-11-06/201).
S 416-017-N00
(11)
Close the fan cowl panels (AMM 71-11-04/201).
S 446-018-N00
(12)
Do the activation procedure for the thrust reverser (AMM 78-31-00/201).
S 796-008-N00 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：747-400 AMM 飞机维护手册 发动机 ENGINE 2(122)
