inch (+/- 1.3 mm) of the first two positions.
NOTE:____ When you rig the PCA pogo rods, you must adjust the
surface upward toward the index plate and not
downward. Therefore, the linkage of the unpowered
PCAs should be pushed forward to eliminate
possibility of a hydraulic lock.
If you adjust the surface too far above the index
plate, it is necessary to pull the linkage of the
unpowered PCAs aft to relieve a hydraulic lock.
This will move the surface down below the index
plate so you can re-rig the surface.
3) Do a check of the input pogo rod end for correct thread
engagement. Make sure that a 0.045 inch (1.14 mm) diameter
pin can not be installed in the inspection hole.
4) Tighten the input pogo rod check nut. Do not lockwire.
a) Make sure that the elevator does not move when you
tighten the input pogo rod check nut.
5) Lockwire the check nut on the input pogo rod end.
Remove hydraulic power, if it is not necessary (AMM 29-11-00/201).
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757 MAINTENANCE MANUAL
S 824-049
(22)
If you replace more than one PCA, then adjust the PCA's (AMM 27-31-00/501).
S 724-089
(23)
Do a test on the elevator travel limits (AMM 27-31-00/501).
S 724-051
(24)
Do a test on the Elevator PCU Monitor System (AMM 27-31-00/501).
F.
Put the Airplane Back to Its Usual Condition
S 424-052
(1)
Install the trailing edge beam and the seal panel.
S 414-053
(2)
Install the PCA access panels 335DB or 345DB, as necessary (AMM 06-42-00/201).
S 864-054
(3)
Remove electrical power (AMM 24-22-00/201).
TASK 27-31-05-024-055
4. Remove the Elevator Reaction Link_________________________________
A. Equipment
(1)
Lock Assemblies from the Elevator PCA Lockout Equipment, B27009-12:
(a)
Lock Assembly, PCA, B27009-2
NOTE:____The PCA lock assembly is installed on the PCA. It contains a shear-out device that can help prevent any damage caused by accidental operation during maintenance.
(b)
Lock Assembly, PCA Input Linkage, B27009-3
NOTE: The input linkage lock assembly holds the linkage in
____ the elevator at the up position during maintenance. It is installed on the center PCA linkage.
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A
757
MAINTENANCE MANUAL
B. References
(1)
AMM 06-42-00/201, Empennage Access Doors and Panels
(2)
AMM 24-22-00/201, Electrical Power - Control
(3)
AMM 27-02-00/601, Flight Controls Surfaces
(4)
AMM 27-31-05/601, Elevator Power Control Actuator
(5)
AMM 27-61-00/201, Spoiler/Speedbrake Control System
(6)
AMM 29-11-00/201, Main (Left, Right and Center) Hydraulic Systems
C.
Access
(1)
Location Zones 211/212 Control Cabin 335/345 Horizontal Stabilizer, Rear Spar to Trailing Edge
(2)
Access Panels 335DB/345DB Left/Right Elevator, PCU's and Control Linkage
D.
Prepare for the Removal
S 844-020
(1)
Prepare for removal with the instructions given in the "Prepare for Removal" paragraph.
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