(a)  Make sure these indications show on the BPCU: 1) EXTERNAL POWER SYSTEM 2) LEFT GEN POWER SYSTEM 3) RIGHT GEN POWER SYSTEM 4) APU GEN POWER SYSTEM
 S 845-018
 (4)  Put the Airplane Back to its Usual Condition
 (a)  
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 (b)  
Put the BAT switch (P5) to the OFF position.

 TASK 24-11-00-825-004
 5.  The Frequency Adjustment of the IDG___________________________________
 A. General
 (1)  The IDG frequency can be manually adjusted.
 (a)  
The IDG frequency adjustment is not a usual maintenance procedure.

 (b)  
If the frequency is not within 400 + 5 Hz, but is within 400 |20 Hz, an adjustment can be done.

 (c)  
If the frequency is out of limits after one adjustment, remove the IDG (AMM 24-11-01/401).

 B. References
 (1)  
AMM 71-00-00/201, Power Plant (Operating Procedures)

 (2)  
AMM 71-11-04/201, Fan Cowl Panels

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757 MAINTENANCE MANUAL
 C. Prepare for the Adjustment
 S 715-021
 (1)  
Stop the engine (AMM 71-00-00/201).

 S 015-027

 (2)  
Open the fan cowl panels (AMM 71-11-04/201).

 D. Procedure
 S 825-022
 (1)  Adjust the system
 (a)  
Remove the lockwire from the governor adjustment screw.

 (b)  
Turn the adjustment screw clockwise to decrease the IDG frequency.

 (c)  
Turn the adjustment screw counterclockwise to increase the IDG frequency. 1) Adjustment must set the generator to 400 |1 hertz. 2) One turn of the screw is equal to a change of 3.0 - 3.5 Hz.

 (d)  
Lock the adjustment screw with a wire.

 S 845-023
 (2)  Put the Airplane back to its Usual Condition
 (a)  
Close the fan cowl panels (AMM 71-11-04/201).

 (b)  
After the adjustment of the IDG, continue with the operational test.

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757 MAINTENANCE MANUAL
 INTEGRATED DRIVE GENERATOR - MAINTENANCE PRACTICES
__________________________________________________
 1.  General_______
 A.  This procedure has instructions to flush the IDG oil lines when the IDG scavenge filter is breached.
 B.  This procedure is used only when the IDG oil lines are not available for replacement.
 C.  This procedure is not a replacement for an overhaul shop external cooling system cleaning maintenance program.
 D.  When an engine is removed for overhaul the external cooling system components are removed and sent to an overhaul shop for proper cleaning.
 TASK 24-11-01-212-005
 2.  IDG Oil Lines Flushing (Scavenge Filter is damaged)___________________________________________________
 A.  References
 (1)  
AMM 24-11-01/401, Integrated Drive Generator

 (2)  
AMM 24-11-04/401, IDG Air/Oil Heat Exchanger

 B.  Equipment
 (1)  Container - 2 gallon capacity
 C.  Consumable Materials
 (1)  Nitrogen - gas (minimum of 249 cubic feet bottle) and regulator from 20 to 250 psig
 D.  Access
 (1)  
Location Zones
 410 Power Plant Nacelle (Left)
 420 Power Plant Nacelle (Right)

 (2)  
Access Panels
 413/423 Fan Cowl Panels (Left)
 414/424 Fan Cowl Panels (Right)

 E.  Procedure
 S 022-034
 (1)  
Remove the IDG (AMM 24-11-01/401).

 S 022-035

 (2)  
Remove the air/oil cooler (AMM 24-11-04/401).
　
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