(5)
Remove the tail cone access door, 3802, to get access to the autopilot elevator actuator (AMM 12-31-41/201).
S 865-077
(6)
Set the horizontal stabilizer to 3 units of trim (B dimension is at
41.57 |0.01 inches).
S 765-009
(7)
Make sure that the voltage between pins J6-37 and J6-1 on the FCC is below 50mv dc (mach trim actuator is at null).
S 865-010
(8)
Open these circuit breakers and attach DO-NOT-CLOSE tags:
(a)
P6 Circuit Breaker Panel
1) AFDS MCP CRS-2
2) AFCS B SNSR EXC AC
3) AFCS B FCC DC
4) AFCS ENGAGE INTLK B
5) AFCS B WARN LIGHT BAT
(b)
P18 Circuit Breaker Panel
1) AFDS MCP DC
2) AIRPLANES WITH MECHANICAL AILERON FORCE LIMITER;
AFDS AIL FORCE LIM
3) AFCS A SNSR EXC AC
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737-300/400/500MAINTENANCE MANUAL
4) AFCS A FCC DC
5) AFCS ENGAGE INTLK A
6) AFCS A WARN LIGHT BAT
S 035-062
(9)
Remove the bolt from one end of the rod assembly between the two actuator levers.
S 035-063
(10)
Remove the bolt from one end of the rod assembly between the actuator A lever and torque tube lever.
S 485-011
(11)
Install the test set:
(a)
Connect the power cable of the test set to the D152 outlet on the electronic equipment rack.
(b)
Disconnect the D1681 (A system) and D1687 (B system) connectors from the actuators.
(c)
Connect a -110 cable from the actuator A to J-1 on the test set.
(d)
Connect a -110 cable from the actuator B to J-2 on the test set.
(e)
Connect a voltmeter (VTVM) to the LVDT FEEDBACK - A J10A and J11A on the test set.
(f)
Set the switches on the test set as follows: 1) LVDT FEEDBACK - A ON, B ON 2) LVDT EXCITATION - A ON, B ON 3) NSS EXCITATION - A OFF, B OFF 4) NSS FEEDBACK - A OFF, B OFF 5) SOLENOID EXCITATION (PISTON and ENGAGE) - A ON, B ON 6) CURRENT SELECT - A T-VALVE 7) SOLENOIDS ON/OFF (center switch) - ON 8) A&B SOLENOIDS - A NORM, B NORM 9) ACTUATOR SELECT - A&B COMMON 10) POWER - ON
NOTE: The NSS EXCITATION light must be OFF, but the
____ remaining lights must be ON.
S 865-014
(12)
Set the hydraulic A and B switches to the ON position.
S 865-015
(13)
Close the SHUTOFF VALVE FLT CONT circuit breakers on the P6 Circuit Breaker Panel.
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S 865-021
(14) Put the actuators to the null position:
(a)
Adjust the POSITION CONTROL A on the test set until the meter is at the lowest value.
(b)
Adjust the POSITION CONTROL A to move the actuator lever down until the VTVM reads 2.00 |0.03 volts. Keep a record of the voltage. Lock the POSITION CONTROL A in its position.
(c)
Disconnect the VTVM.
(d)
Connect the VTVM to LVDT FEEDBACK - B J10B and J11B on the test set.
(e)
Adjust the POSITION CONTROL B to move the actuator lever down until the VTVM reads 2.00 |0.03 volts. Keep a record of the voltage. Lock the POSITION CONTROL B in its position.
(f)
Make sure that there is no movement at the actuator levers.
S 215-016
(15) Do a check on the shear rivets of the two actuator levers:
(a)
Examine the shear rivet areas.
(b)
Make sure that there is no movement in these areas.
(c)
If there is a movement, remove the lever assembly and replace the shear rivets (OHM 27-09-05).
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本文链接地址：737-300 400 500 AMM 飞机维护手册 自动飞行 AUTOFLIGHT 2(4)
