oiler) on the IDG oil fill/drain panel. 3) Put the end of the drain hose in the container.
 WARNING:_______USE CARE WHEN YOU CONNECT THE DRAIN HOSE. PRESSURE IN THE IDG CAN CAUSE HOT OIL TO COME OUT OF THE COUPLING. HOT OIL CAN CAUSE SERIOUS INJURY.
 4)  Connect the oil-drain hose to the overflow drain coupling on the IDG oil/drain panel. Allow the surplus oil to drain into the container.
 5) Remove the oil-drain hose. 6) Install the cover on the overflow drain coupling (pressure oiler).
 F.  Procedure
 S 022-035
 (1)  
Remove the IDG (AMM 24-11-01/401).

 (2)  
Remove the fuel/oil cooler (AMM 79-21-01/401).

 (3)  
Remove the air/oil heat exchanger (AMM 24-11-14/401).

 S 022-036
 S 022-037
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747-400 MAINTENANCE MANUAL
 S 172-100
 WARNING: USE A REGULATOR ON THE NITROGEN BOTTLE TO FLUSH THE IDG
_______ EXTERNAL OIL COOLING CIRCUIT. AN UNREGULATED NITROGEN BOTTLE USED AS A PRESSURE SOURCE CAN CAUSE INJURIES AND DAMAGE TO EQUIPMENT.
 (4)  Attach a nitrogen bottle to the outlet side of each IDG external cooling line segment.
 NOTE: Use the nitrogen to purge the external cooling system against
____ the direction of normal oil flow in each line segement. Begin the task with a full bottle of nitrogen.
 (a) Use 250 psig to purge each IDG cooling line segment.
 NOTE: Use equal amounts of nitrogen in each external cooling
____ segment. Use the complete bottle of nitrogen.
 S 412-043
 (5)  
Install a clean fuel/oil cooler (AMM 79-21-01/401).

 S 412-044

 (6)
Install a clean air/oil heat exchanger (AMM 24-11-14/401).

 S 412-047

 (7)  
Install an overhauled IDG (AMM 24-11-01/401).

 (a)  
Service the IDG with oil (AMM 12-22-07/301).

 (b)  
Do the engine ground test - idle power procedure to do a check for leaks (AMM 71-00-00/501).

 (c)  
Examine the IDG oil level (AMM 12-13-07/301).

 (d)  
Service the IDG (AMM 12-13-07/301).

 (8)  
Close the left thrust reverser half (AMM 78-31-00/201).

 S 412-050
 TASK 24-11-01-242-057
 6. Intergrated Drive Generator oil cooling system leak check ( Talcum powder )
____________________________________________________________________________
 A. General
 (1)  This check is used to check for oil leakage in the IDG external cooling circuit.
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747-400
MAINTENANCE MANUAL

 B. Equipment
 (1)  
Talcum powder or foot powder - commerically available

 (2)  
Nitrogen - gas (minimum of 239 cubic feet bottle) and regulator from 20 - 250 psig.

 C. References
 (1)  
AMM 24-22-00/201, Manual Control

 (2)  
AMM 71-00-00/201, Power Plant

 (3)  
AMM 78-31-00/201, Thrust Reverser System

 (4)  
WDM 24-11-11 thru WDM 24-11-14

 (5)  
SSM 24-11-01 thru SSM 24-11-04

 D. Access
 (1)  
Location Zone
 412 Engine 1 - Main Gearbox Aft Face 7 o'clock
 422 Engine 2 - Main Gearbox Aft Face 7 o'clock
 432 Engine 3 - Main Gearbox Aft Face 7 o'clock
 442 Engine 4 - Main Gearbox Aft Face 7 o'clock
 221 Control Cabin, LH

 (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

 E. Prepare for the IDG external oil cooling circuit leak check.
 S 012-064
　
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