747-400 AMM 飞机维护手册 发动机 ENGINE 1(49)

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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
No. 8 - Oil System Contamination Inspection
___________________________________________
 7)  Examine again the main oil filter and the magnetic chip detectors for contamination.
 8)  If you do not find contamination, install the oil filter and the chip detectors. a) Continue the operation of the engine, but examine the
 chip detectors again at 50 hours of service. 9) If you find contamination, do the particle analysis, and the steps to find if there is more contamination.
 NOTE: It is not necessary to examine the last chance oil
____ strainers a second time.
 a)  If you find contamination after the second engine operation, immediately remove the engine, find the source of the contamination, and correct the problem.
 G.  Examine For Black Oil
 NOTE: Dark oil can be an indication of a serious problem or it can
____ be a condition that requires no maintenance action. The dark oil condition referred to as "black oil" is the result of some additives in the oil that oxidize as the oil ages. This can cause very fine carbon particulate which darkens the oil without an effect on the properties which lubricate and cool (Total acid number and viscosity are not changed).
 S 286-321-N00
 (1)  
Perform the maintenance below if one or more of the items that follows is true:

 (a)  
The oil has an unusual smell (burnt or equivalent to fuel or hydraulic fluid).

 (b)  
The oil thick or gummy.

 (c)  
An engine oil over temperature occurred.

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No. 8 - Oil System Contamination Inspection
___________________________________________
 S 286-322-N00
 (2)  
If one or more of the items above is true, you must do the
 procedures that follow:

 (a)  
Examine the oil for contamination from hydraulic fluid.

 (b)  
Perform Oil Overtemerature Inspection (AMM 72-00-00/201).

 S 286-323-N00
 (3)  
If none of the items above are true, the engine can continue in service.

 H.  
Examine the Oil for Contamination from Hydraulic Fluid.

 S 286-225-N00
 CAUTION: IF THE OIL IS BLACK, IT CAN BE THE RESULT OF OIL TEMPERATURES
_______ THAT WERE HIGHER THAN THE USUAL OIL TEMPERATURES (SEE FIM 71-00-00/101, HIGH OIL TEMPERATURE). BLACK OIL CAN ALSO BE A SIGN OF OTHER DAMAGE OR CONTAMINATION. IF HIGH OIL TEMPERATURE HAS NOT OCCURRED, CONTINUE WITH THE STEPS BELOW.
 (1)  
Examine for contamination from hydraulic fluid if one or more of the items that follows is true.

 (a)  
There was a failure of a hydraulic pump, and it is possible that hydraulic fluid went in the gearbox drain.

 (b)  
There is corrosion of metal adjacent to the gearbox in the open space in the hydraulic pump drive pad.

 (c)  
There is hydraulic fluid in the open space of the hydraulic pump drive pad.

 (d)  
The engine oil is black, thick, and gummy.

 S 286-212-N00
 (2)  
Examine the oil for contamination from hydraulic fluid.

 (a)  
Examine the viscocity of the oil.

 1)  Compare the viscosity of the oil sample with the viscosity of a sample of the same type of oil that has no contamination (Refer to the PW SB 238 for the oil quality limits).
 NOTE: If the viscosities are very different, the oil
____ will possibly have contamination by hydraulic fluid or jet fuel.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
No. 8 - Oil System Contamination Inspection
___________________________________________
 (b)  Do a check of the phosphorus content of the oil.
　
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