A/P ELEVATOR ACTUATOR - ADJUSTMENT/TEST
EFFECTIVITY
SA ZS-SIA and on GJ B-2509 and B-2510
1. A/P Elevator Actuator Adjustment
A. General
(1) The elevator rigging must be fully adjusted and operable before the actuator can be adjusted (Ref 27-31-00, Elevator and Tab Control System).
B. Equipment and Materials
(1)
VTVM - Hewlett Packard Model 410C (2 required)
(2)
Test Set - Autopilot Elevator/Rudder/Aileron Control Unit - P/N F80217-125
(3)
Rigging Weight - 1.90 lbs
(4)
Dry air pressure source, 0 to 5 psi, with gage, fittings, for connecting to feel system pitot tubes
(5)
Ladder or stand for observing elevator trailing edge displacement scale on tail cone
C. Prepare to Adjust
(1)
Provide electrical and hydraulic power
(2)
Position hydraulic system A and B switches on P5 panel to OFF and open FLT CONT SYS circuit breaker on P6 load control center.
WARNING: PRESSURIZING HYDRAULIC SYSTEMS WILL SUPPLY POWER TO RUDDER, AILERON, ELEVATOR, SPOILER AND SPEED BRAKE SYSTEMS. CARE SHOULD BE TAKEN TO ISOLATE OR TAG SYSTEMS NOT BEING TESTED TO PREVENT INJURY TO PERSONNEL OR DAMAGE TO AIRPLANE AND EQUIPMENT.
(3)
Open autopilot circuit breakers on P6 and P18 load control centers.
(4)
Close mach trim circuit breakers on P6 load control center.
(5)
Remove tail cone access panel 3802 (Ref Chapter 12, Access Doors and Panels).
(6)
Set horizontal stabilizer to 3 units of trim equal to B dimension of 41.57 士0.01 inches (Ref Chapter 27, Horizontal Stabilizer Trim Control System).
(7)
Ensure mach trim actuator is fully extended (Ref Chapter 27, Elevator and Tab Control System).
(8)
On airplanes with stick nudger installed, ensure stick nudger actuator is fully extended (Ref Chapter 27, Elevator and Tab Control System).
(9)
Connect power cable between test set and D152 electronic equipment rack service outlet.
(10)
Disconnect D1681 (A system) and D1687 (B system) connectors from autopilot actuators; connect cables J-1 to actuator A and J-2 to actuator B then to test set.
(11)
Connect VTVM to LVDT FEEDBACK J10A and J11A on test set (A system).
Feb 20/93 22-11-261 Page 501
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(12) Set switches on test set as follows:
(a)
LVDT FEEDBACK switches A ON, B ON.
(b)
LVDT EXCITATION switches A ON, B ON.
(c)
NSS EXCITATION switch A OFF, B OFF.
(d)
NSS FEEDBACK switches A OFF, B OFF.
(e)
SOLENOID EXCITATION switches PISTON and ENGAGE, A ON, B ON.
(f)
CURRENT SELECT switch to A T-VALVE.
(g)
SOLENOIDS ON/OFF (Center Switch): ON
(h)
A&B SOLENOIDS switches to A NORM, B NORM, ON.
(i)
ACTUATOR SELECT switch to A and B COMMON.
(j)
POWER switch to ON.
NOTE: All lights should be on except NSS excitation.
D. Adjust Actuator (Fig. 501)
(1)
Remove bolts from one end of rod assembly between 2 actuators and rod assembly between actuator A and lower torque tube lever.
(2)
Add rigging weight to aft hole of lower torque tube lever.
(3)
Position hydraulic system A and B switches to ON and close FLT CONT SYS circuit breaker.
WARNING: MAKE SURE ALL PERSONNEL AND OBSTRUCTIONS ARE CLEAR OF AILERON, ELEVATOR AND TAB SURFACES. SURFACES MAY MOVE ABRUPTLY WHEN HYDRAULIC POWER IS APPLIED.
(4)
Operate position control knob (R-1A) on test set until meter is at lowest reading.
(5)
Operate position control knob so that actuator levers move down until voltage at J10A and J11A is 2.00士0.03 volts. Lock R-1A in place and record voltage. Check that there is no free play at autopilot output levers. Inspect shear rivets area of output lever and check for no movement in this area. If movement is detected, remove lever assembly and replace shear rivets, ref OHM 27-09-05.
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