757 AMM 飞机维护手册电源 ELECTRICAL POWER 1(31)_航空信息_民用航空_通用航空

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(a) If more than 1 pint (1/2 liter) is removed from the IDG, smell the IDG oil for fuel. When fuel is in the IDG oil, do the Scavenge Filter and Oil Condition Check.
NOTE: When it is difficult to smell fuel in the IDG oil, do
____ the Specific Gravity Oil Check. It is better to do the Specific Gravity Oil Check on the flight line because fuel smell is everywhere on the flight line.
(b)
If more than 1 pint (1/2 liter) is removed from the IDG and there is no fuel in the oil, the IDG may have been over-serviced. Do the Scavenge Filter and Oil Condition Check.

(c)
If the oil removed from the IDG is less than 1 pint (1/2 liter), check the low oil level indicator. 1) Make sure the low oil level indicator shows a silver

circle.
G. Specific Gravity Oil Check
S 686-031
(1) Do these steps to examine the specific gravity of IDG oil:
(a) Get a sample of new IDG oil that has not been used.
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(b) Examine the specific gravity of new IDG oil.
NOTE: The specific gravity of new IDG oil is from 0.89 to
____ 0.99.
(c)
Get a sample of used IDG oil.

(d)
Examine the specific gravity of used IDG oil.

(e)
Compare the specific gravity readings.

(f)
If the specific gravity reading of the used IDG oil is lower than 0.89, fuel may be in the IDG oil. Do the Scavenge Filter and Oil Condition Check.

(g)
If the specific gravity reading of the used IDG oil is above 0.99, hydraulic fluid or water may be in the IDG oil. Do the Scavenge Filter and Oil Condition Check.

H. Water In The Oil Check
S 686-032
(1) Get a sample of the oil in a glass container.
NOTE: The amount of oil used for a sample is not important.
____
S 756-033
WARNING: DO NOT GET METHYL ALCOHOL IN YOUR MOUTH, EYES OR ON YOUR SKIN.
_______ DO NOT BREATHE THE FUMES FROM THIS MATERIAL. PUT ON A PROTECTIVE SPLASH GOGGGLE AND GLOVES WHEN YOU USE METHYL ALCOHOL. KEEP METHYL ALCOHOL AWAY FROM SPARKS, FLAME AND HEAT. METHYL ALCOHOL IS POISONOUS AND FLAMMABLE AND CAN CAUSE INJURY.
(2) Add 3 parts of methyl alcohol to the oil sample.
NOTE: The methyl alcohol must be from an unopened container.
____
S 916-034
(3) Discard the unused methyl alcohol.
NOTE:____Methyl alcohol absorbs water from the air. Methyl alcohol used from a container which has been opened and stored on the shelf will give unsatisfactory results.
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S 756-035
(4)
Shake the mixture of IDG oil and methyl alcohol for one minute.

S 756-036

(5)
Wait one (1) minute and check the mixture.

(a) If the mixture is cloudy, water is in the IDG oil. Do the Scavenge Filter and Oil Condition Check.
I. Scavenge Filter and Oil Condition Check
S 286-087
(1) Examine the scavenge filter condition, the IDG oil condition and do actions in the Scavenge Filter and Oil Condition Check table:
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