TASK 24-11-01-206-001
 2.  Examine the Pressure Differential Indicator and the Scavenge Filter (Fig 601)
___________________________________________________________________
 A.  References
 (1)  
AMM 12-13-07/301, IDG - Servicing

 (2)  
AMM 12-22-07/301, IDG - Servicing

 (3)  
AMM 24-11-00/501, IDG System

 (4)  
AMM 24-11-04/401, Scavenge Filter

 (5)  
AMM 24-11-14/401, IDG Air/Oil Heat Exchanger

 (6)  
AMM 78-31-00/201, Thrust Reverser System

 (7)  
AMM 79-21-01/401, Fuel/Oil Cooler

 (8)  
WDM 24-11-11, WDM 24-11-12, WDM 24-11-13, WDM 24-11-14

 (9)  
SSM 24-11-01, SSM 24-11-02, SSM 24-11-03, SSM 24-11-04

 B.  
Equipment

 (1)  
Container - 5 U.S. gallon (20 liter) capacity, suitable to collect oil drainage from IDG

 (2)  
Overflow drain tool - Risbridger 2315, W&J Risbridger Ltd. Bletchingley, NR. Redhill, Surrey RH1 4LN, England (optional)

 C.  
Access

 (1)  
Location Zone 412 Engine 1 - Main Gearbox Aft Face 6 o'clock 422 Engine 2 - Main Gearbox Aft Face 6 o'clock 432 Engine 3 - Main Gearbox Aft Face 6 o'clock 442 Engine 4 - Main Gearbox Aft Face 6 o'clock

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A

747-400
MAINTENANCE MANUAL

SEE  A 
FWD 
IDG  MAIN GEARBOX  DSEE INTEGRATED A DRIVE GENERATOR (IDG)  SEE  B SEE  C 

FILTER ELEMENT
FWD
FILTER
COVER

BOTTOM VIEW
B

Integrated Drive Generator Inspection
Figure 601 (Sheet 1)

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747-400
MAINTENANCE MANUAL

PLUG
BOTTOM VIEW

Integrated Drive Generator Inspection
Figure 601 (Sheet 2)

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MAINTENANCE MANUAL

 (2)  Access Panel
 415 Left Thrust Reverser Half - Engine 1
 425 Left Thrust Reverser Half - Engine 2
 435 Left Thrust Reverser Half - Engine 3
 445 Left Thrust Reverser Half - Engine 4

 D.  Procedure
 S 016-002
 (1)  
Open the left thrust reverser half (AMM 78-31-00/201).

 S 216-004

 (2)  
Do this step to examine the pressure differential indicator (the red button) adjacent to the scavenge filter on the IDG.

 (a)  
Examine the position of the red button.

 1)  FOR IDG USING SINGLE DPI EXTENSION PROCEDURE; If the indicator button is in the up position, do these steps: a) Examine the IDG scavenge filter.
 NOTE: Scavenge filter inspection is a check to see if
____ it is necessary to replace the cooler and oil lines.
 b) Replace the IDG (AMM 24-11-01/401). 2) Do these steps if the button is in the down position: a) If other regular IDG service maintenance is not required, no more work is necessary. b) If other regular IDG service maintenance tasks are required, do those tasks.
 3)  FOR IDG USING THE ALTERNATE DPI EXTENSION PROCEDURE; If the indicator button is in the up position, do these steps:
 4)  Check the IDG DPI Extension decal for the number of DPI resets accomplished a) If this is the fourth (4th) occurance the DPI has been
 reset, replace the IDG (AMM 24-11-01/401).
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