(a)
Make sure the rudder trim indicator shows at least 15.2 units of trim in the correct direction.
(b)
Make sure the rudder position indicator moves approximately two-thirds of full scale (approximately 22 degrees).
D.
Put the Airplane Back to Its Usual Condition
S 862-044
(1) Remove electrical power if it is not necessary (Ref 24-22-00).
TASK 27-21-23-102-017
6. Clean the Rudder Trim Switch____________________________
A. Consumable Materials
(1)
Detergents:
(a)
B00157 Spray White E or Equivalent
(b)
B00000 Winsol APC-120-WX
B.
References
(1)
24-22-00/201, Electrical Power - Control
(2)
25-00-00/701, Equipment/Furnishings
(3)
27-21-00/501, Rudder and Rudder Trim Control System
C.
Access
(1)
Location Zones
211/212 Control Cabin
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A
757 MAINTENANCE MANUAL
D. Prepare to Clean
S 862-018
(1)
Supply Electrical Power (Ref 24-22-00).
S 862-019
(2)
Move the FLT CONTROL SHUTOFF L, R, and C switches on the right side panel, P61, to OFF. Attach DO-NOT-OPERATE tags and make sure the switch position lights come on.
S 862-029
(3)
Open these circuit breakers on the overhead panel, P11, and attach DO-NOT-CLOSE tags:
(a)
11C10, RUD TRIM
(b)
11H17, FLT CONT SHUTOFF TAIL LEFT
(c)
11H18, FLT CONT SHUTOFF TAIL CTR
(d)
11H28, FLT CONT SHUTOFF TAIL RIGHT
(e)
11J15, AILERON TRIM
(f)
11J17, RUDDER TRIM POS
E.
Clean the Rudder Trim Switch (Fig. 201)
S 032-020
(1)
Loosen the two screws in the rudder trim knob.
S 032-021
(2)
Remove the knob from the rudder trim switch.
S 102-022
CAUTION:_______MAKE SURE THE DETERGENT DOES NOT GO IN THE TRIM SWITCH. THE TRIM SWITCH CAN BECOME DAMAGED IF THE DETERGENT GOES IN THE TRIM SWITCH.
(3) Use a sponge and the detergent to clean the lightplate surface and the bottom surface of the trim knob (AMM 25-00-00/701).
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757
MAINTENANCE MANUAL
S 432-023
(4)
Install the knob on the rudder trim switch and tighten the two knob screws.
S 862-024
(5)
Remove the DO-NOT-CLOSE tags and close these circuit breakers on the P11 panel:
(a)
11C10, RUD TRIM
(b)
11H17, FLT CONT SHUTOFF TAIL LEFT
(c)
11H18, FLT CONT SHUTOFF TAIL CTR
(d)
11H28, FLT CONT SHUTOFF TAIL RIGHT
(e)
11J15, AILERON TRIM
(f)
11J17, RUDDER TRIM POS
S 862-028
(6)
Remove the DO-NOT-OPERATE tags and move the FLT CONTROL SHUTOFF L, R, and C switches on the P61 panel to ON.
S 712-025
(7)
Do the operational test for the rudder trim system (Ref 27-21-00).
S 212-073
(8)
GUN 001-051, 101-107, 206; Make sure the clearance between the trim switch knob and the lightplate is between a minimum of 0.02 inches (0.5 mm) to a maximum or 0.05 inches (1.3 mm).
F.
Put the Airplane Back to Its Usual Condition
(1)
Remove electrical power if it is not necessary (Ref 24-22-00).
S 862-027
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