................................................................................ |Visible magnetic or |Oil condition is not |1. Remove the IDG | |non-metallic particles |a factor | (AMM 24-11-01/401). | |in the scavenge filter | | | |and the scavenge filter | |2. Replace the IDG air/oil | |is breached. | | cooler (AMM 24-11-04/401).| |(See NOTE for more | | | |scavenge filter data) | |3. Replace the IDG oil cooler| |*[1] | | lines. | | | | | | | |4. Install a new IDG. | | | | (AMM 24-11-01/401). | ................................................................................ |*[1] NOTES: | | | |If the scavenge filter element or filter cover shows a number of moderately | |scattered, small metallic flakes (bronze or silver colored metal), flakes of | |generator insulation, black epoxy flakes, or sleeving, do not replace the IDG.| |These products are normal wear during IDG operation. | | | |If the filter element shows bright metal deposits that can be clearly | |specified as chunks or pieces caused by breakage, or a large number of small | |metallic flakes (bronze or silver-colored metal), replace the IDG. These are | |indications of IDG internal damage. | | | |The filter is breached if the filter is damaged or missing, the O-ring is | |damaged or missing, or the filter cap is damaged or loose. | 2.........................…......................….............................1
1) If the IDG was replaced, no more work is necessary.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
757 MAINTENANCE MANUAL
2) If the IDG was not replaced, check the DPI Resets decal on the scavenge filter cover for the number of DPI resets that has been done (Fig. 603).
NOTE: When the DPI is in the up position and if the
____ actions in the DPI Extension table does not require to replace the IDG, the DPI can be reset 3 times.
a) If the DPI Resets decal shows it is the fourth (4th) DPI extension, replace the IDG (AMM 24-11-01/401).
b) If the DPI Resets decal shows it is not the fourth (4th) DPI extension, use a blunt tool to rub out the next number on the DPI Resets decal and use finger to push the DPI red button down.
(b) If the button is in the down position, do these steps: 1) If other regular IDG service maintenance is not required, no more work is necessary.
2) If other regular IDG service maintenance tasks are required, do those tasks.
S 866-083
(2) Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P6 panel:
(a)
6B5, L GEN DRIVE DISC
(b)
6B6, R GEN DRIVE DISC
S 416-086
(3) Close the fan cowl panel (AMM 71-11-04/201).
TASK 24-11-01-286-014
5. Examine The Oil In The IDG.__________________________
A. General
(1)
The Visual Oil Check will visually examine the oil for contamination, the oil color, signs of overheating or chemical contamination.
(2)
The Specific Gravity Oil Check examines the specific gravity of the IDG oil to find if there is fuel, hydraulic fluid or water in the IDG oil. This check should be done when it is difficult to smell fuel in the IDG oil.
NOTE:____Fuel smell is everywhere on the flight line. Do the specific gravity check to check for fuel in the oil
(3)
The Water in Oil Check will find if there is water in the oil.
B. References
(1)
AMM 12-13-03/301, IDG - Servicing
(2)
AMM 24-11-00/501, Generator Drive System
(3)
AMM 24-11-02/201, Scavenge Filter
(4)
AMM 71-11-04/201, Fan Cowl Panels
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