(8)
The correction of the difference in the rudder standby power
(9)
The correction of the elevator difference with power off
(10)
The difference in the clearance of the trailing edge of the leading edge slat.
B.
For the best results, make sure there is symmetry between the left and the right wings in the specified tolerances.
(1)
You can use the charts on Fig. 501 and Fig. 501A to record the data that will help you do these tasks.
C.
Find the Necessary Flap Adjustment
(1)
Do a check of these other systems to make sure they are not the cause of the lateral trim error:
(a)
Make sure the ailerons are adjusted correctly. To check the ailerons, do this task: Aileron and Aileron Trim Control System Adjustment (AMM 27-11-00/501).
(b)
Make sure the rudder is adjusted correctly. To check the rudder, do this task: Rudder and Rudder Trim Control System Test (AMM 27-21-00/501).
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(2)
A
737-300/400/500MAINTENANCE MANUAL
(c)
Make sure the outboard trailing edge flaps and aft flaps are adjusted correctly: 1) For the outboard trailing edge flaps, do this task:
Outboard Trailing Edge Flap Adjustment (AMM 27-51-34/501). 2) For the outboard aft flap, do this task: Outboard Aft Flap Installation (AMM 27-51-39/401).
(d)
Make sure the inboard trailing edge flaps and aft flaps are adjusted correctly: 1) For the inboard trailing edge flaps, do this task: Inboard
Trailing Edge Flap Adjustment (AMM 27-51-04/501). 2) For the inboard aft flap, do this task: Aftflap Installation (AMM 27-51-11/401).
(e)
Make sure the spoilers are adjusted correctly. To check the spoilers, do this task: Flight Spoiler Adjustment (AMM 27-61-11/501).
Do a test flight to find the lateral trim necessary for straight and level flight for all flight conditions:
NOTE:____Use the captains control wheel to find the trim limits. One unit of aileron trim is equal to six degrees of control wheel rotation.
(a)
To find the aileron trim necessary during cruise, fly with these conditions: 1) Flight speed: Approximately 0.74 mach. 2) Altitude: 30,000 feet or higher. 3) Fuel load: Balanced in the limit of 50 pounds (23
kilograms). 4) Throttles: Balanced thrust in the limt of 1 percent, with autothrottles OFF. 5) Autopilot OFF.
(b)
Apply rudder trim to get zero heading change.
NOTE: Keep this rudder trim position through the rest of
____
the trim conditions.
(c)
Apply aileron trim to keep the wings level and maintain zero heading change.
(d)
Write down the amount and direction of aileron trim necessary to maintain straight and level flight.
NOTE: This is the trim for the flaps up, cruise condition.
____
(e) To find the aileron trim necessary for low speed cruise, and with the flaps extended, fly with these conditions: 1) Altitude: Between 10,000 to 17,000 feet. 2) Fuel load: Balanced in the limit of 50 pounds (23
kilograms). 3) Throttles: Balanced thrust in the limt of 1 percent, with autothrottles OFF. 4) Autopilot OFF.
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A 737-300/400/500MAINTENANCE MANUAL
(f) (g) (h) 5) Rudder trim in the same position as the cruise condition.Fly at 250 KIAS, with the flaps retracted.Apply aileron trim to keep the wings level and maintain zero heading change.Write down the amount and direction of aileron trim necessary to maintain straight and level flight.
NOTE:____ This is the trim for the flaps up, 250 knot condition.
(i) (j) (k) Reduce the airspeed to flaps 1 maneuvering speed, 190 KIAS, and extend the flaps to the 1-unit position.Apply aileron trim to keep the wings level and maintain zero heading change.Write down the amount and direction of aileron trim necessary to maintain straight and level flight.
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