F. IDG Scavenge and Charge Filter Inspection/Check
SUBTASK 24-11-41-210-006
(1) Do these steps to visually examine the differential pressure indicator (DPI):
NOTE: The DPI is the red button adjacent to the scavenge/charge filter on the IDG.
(a) If the DPI is in the up position, examine the scavenge/charge filter condition, the IDG oil
condition and do actions in the DPI extension table below.
NOTE: When the DPI is in the up position and if the DPI resets decal (if installed) shows
it is the 4th DPI extension, the IDG must be replaced.
1) If the IDG was replaced, no more work is necessary.
2) If the IDG was not replaced, check the DPI resets decal (if installed) on the
scavenge/charge filter cover for the number of DPI resets that has been done.
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.
NOTE: When the DPI is set, an inspection must occur at an interval of 100 flight
hours.
NOTE: After four consecutive 100 flight hour check without DPI extension, the DPI
check can revert back to the normal interval.
a) If the DPI resets decal (if installed) shows it is the fourth (4th) DPI extension,
replace the IDG (PAGEBLOCK 24-11-11/401).
b) If the DPI resets decal (if installed) 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.
Table 201/24-11-41-993-803 DPI EXTENSION
SCAVENGE/CHARGE FILTER
CONDITION IDG OIL CONDITION ACTION
No visible magnetic or non-metallic
particles (See NOTE for more
scavenge/charge filter data)
*[1]
No oil discoloration. No sign of
over-heating. No chemical
contamination of the oil is suspected.
1. Drain the oil in the 5 U.S.-gal (19 l)
oil resistant container, STD-205.
2. Replace the scavenge/charge filter
(PAGEBLOCK 24-11-41/201).
3. Service with oil
(PAGEBLOCK 12-13-21/301).
737-600/700/800/900
AIRCRAFT MAINTENANCE MANUAL
24-11-41
Page 205
D633A101-ILF Jun 15/2019
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
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