B.
Equipment
(1)
Rig Pins from Set B20003-XX (Ref 20-10-24):
(a)
E/ST8 - B20003-21
(b)
E/ST9 - B20003-21
(2)
Breakout Box and Cables from Flight Controls
Position Sensors Rigging Breakout Box
Equipment - A27063-88:
(a)
Breakout Box - A27063-2
(b)
Cable Assembly - A27063-18
(c)
Cable Assembly - A27063-19
(3)
Gage Assembly - B27039-3 (part of Elevator and Stabilizer Rigging Equipment, B27039-1)
(4)
Digital Voltmeter (DVM) - John Fluke 8020B
(adjustment PROCEDURE 1 or 2) John Fluke
Manufacturing Co., Inc., Everett, Washington
NOTE: Two DVM's are necessary if PROCEDURE 2
____ (airplane power procedure) is used.
(5)
Power Supply - Powertron Model 5900 (adjustment
PROCEDURE 1) Industrial Test Equipment Corp.,
Port Washington, New York
C.
References
(1)
06-42-00/201, Empennage Access Doors and Panels
(2)
20-10-24/201, Rig Pins
(3)
24-22-00/201, Electrical Power - Control
(4)
27-38-02/401, Elevator Position Transmitter
(5)
27-41-00/501, Horizontal Stabilizer Trim Control System
(6)
29-11-00/201, Main (Left, Right, and Center) Hydraulic Systems
D.
Access
(1)
Location Zones 211/212 Control Cabin 335/345 Horizontal Stabilizer Rear Spar to Trailing Edge
(2)
Access Panels 335CB/345CB Position Transmitter (Left/Right) 335DB/345DB Middle Elevator PCA (Left/Right)
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757 MAINTENANCE MANUAL
E. Prepare for the Adjustment Procedure
S 865-010
(1)
Supply electrical power (Ref 24-22-00).
S 215-011
(2)
Make sure that the control columns are at the neutral position.
S 495-012
(3)
Use a rope to hold the control columns at the neutral position and attach a DO-NOT-OPERATE tag.
NOTE: If you move the control columns, with the elevators not
____ supplied with power, the elevators will move down because of their weight.
S 225-013
(4) Make sure the upper surfaces of the left and right elevator trailing edge are less than 0.15 inch (3.8 mm) away from the locating hole on the index plates (Fig. 503).
NOTE: Adjustment of the PCAs and input rods for the PCAs can be
____ necessary before you adjust the elevator position transmitters (Ref 27-31-00).
S 865-014
(5)
Put the L, R, and C FLT CONTROL SHUTOFF switches on the right side panel, P61, to the OFF position.
S 215-015
(6)
Make sure that the power is removed from the left, right, and center hydraulic systems.
S 015-016
(7)
Remove the access panels for the middle PCAs, 335DB and 345DB (Ref 06-42-00).
S 015-017
(8)
Remove the access panels for the position transmitter , 335CB and 345CB (Ref 06-42-00).
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757 MAINTENANCE MANUAL
F. Elevator Position Transmitters Adjustment (Fig. 503).
NOTE: Three procedures to adjust the elevator position transmitters are
____ given: PROCEDURE 1 uses a commercially available power supply, digital voltmeter (DVM), and breakout box equipment. PROCEDURE 2 uses airplane power, two DVM's, and breakout box equipment. PROCEDURE 3 uses the EICAS computer and a person in the control cabin and a person at the elevator.
The steps that follow are used for the left and right position transmitters. Adjust only one position transmitter at a time.
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