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 C.  Make sure that the control system components are in rig when the trim problems occur and during this procedure. Make sure that the rudder-ratio-changer rigging does not permit too much rudder movement when the airplane changes speed. Also, it is important that the trailing edge flaps be symmetrical.
 D.  Do a check of the rudder trim error and the aileron trim error when the airplane is in flight. Keep a constant speed of .80 mach and an altitude of 30,000 feet or more. Do not adjust the flight control surfaces if therudder trim error is 3 units or less, and the aileron trim error is 1/2unit or less. If the rudder trim error is more than 3 units, check therudder rigging (AMM 27-21-00/501). If the aileron trim error is more than 1/2 unit (as measured at the captain's aileron trim indicator) then this procedure is applicable.
 TASK 27-01-00-825-001Trailing Edge Flap Adjustment
_____________________________
 A.  Equipment
 (1)
TE Flap PDU Lock - B27008-1

 B.  
Consumable Materials

 (1)
A00247 Sealant, BMS 5-95

 C.  
References

 (1)
27-11-00/501, Aileron and Aileron Trim Control System

 (2)
27-18-00/501, Aileron Position Indicating System

 (3)
27-21-00/501, Rudder and Rudder Trim Control System

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757
MAINTENANCE MANUAL

 (4)  
27-31-00/501, Elevator Control System

 (5)  
27-51-00/501, Trailing Edge Flap System

 (6)  
27-51-02/501, Inboard Trailing Edge Flaps

 (7)  
27-51-14/501, Outboard Trailing Edge Flaps

 (8)  
27-51-31/201, Outboard TE Flap Track Fairings

 (9)  
27-61-00/501, Spoiler/Speedbrake Control System

 (10)
 29-11-00/201, Pressurize/Depressurize Main Hydraulic System

 D.
Access

 (1)  
Location Zones
 566/666 Outboard Forward Flap
 567/667 Outboard Aft Flap

 E.
Do a Check for Other Possible Causes

 S 225-002
 (1)  
Make sure that the incorrect trim condition is not caused by a rigging problem or an out of tolerance system. Before you do the adjustment, make sure that these systems are in tolerance.

 (a)  
Make sure that each main wing tank has at least a 1000 pound

 (453.6 Kg) fuel load. The fuel load must be divided equally (|5%) so that each main wing tank has the same fuel load.
 (b)  Make sure that the outboard-trailing-edge flaps are not out of tolerance. Make sure that the right outboard flap and the left outboard flap are symmetrical (use a tolerance of 0.14 degrees). Correct the rigging if it is necessary (Ref 27-51-00/501).
 NOTE: The flaps must be up and pressurized for a minimum
____ of 30 seconds before you measure the flap angles.
 (c)  Make sure that the inboard trailing-edge flaps are in tolerance. Correct the rigging if it is necessary (Ref 27-51-02/501).
 NOTE: The flaps must be up and pressurized for a minimum
____ of 30 seconds before you measure the flap angles.
 (d)  Make sure that the ailerons are in tolerance. Make sure the aileron trailing-edges align with the flap trailing-edges when the ailerons are in their neutral position (use a tolerance of
 0.12 inch (3.0 mm) (Ref 27-11-00/501).
 (e)  
Make sure that the spoilers are in tolerance. Make sure that the .06 inch (1.5 mm) gap between the spoiler trailing edge and the flaps up position is correct. Correct the alignment if it is necessary (Ref 27-61-00/501).

 (f)  
Make sure that spoiler breakout does not occur before the control wheel has been turned clockwise or counterclockwise 8 degrees (Ref 27-61-00/501).

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757 MAINTENANCE MANUAL
 (g)  Make sure that each elevator is aligned with its trailing-edge index plate (use a tolerance of 0.10 inch (2.54 mm)) when the stabilizer jackscrew dimension B is 15.89 | 0.01 inches
　
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