Repair Confirmation at the end of this task. 2) If you do not find a problem, continue with the next step.

(b)  
Do a check of the linkages between the Torque Tube and the Main PCU for binding or being disconnected. 1) If you find a problem, do the steps to repair the problem, then do the steps for

Repair Confirmation at the end of this task. 2) If you do not find a problem, continue with the next step.

(c)  
Make sure that the FLT CONTROL A and B switches on the P5-3 panel are in the ON positions.  Measure the voltage between pin 1 and pin 2 of connector D10070 on the EE shelf. 1) If the voltage measured is not between 2.75 Vdc to 7.25 Vdc, adjust the control

rod of the rudder main PCU (AMM 27-21-1/501), then do the steps for Repair Confirmation at the end of this task. 2) If the voltage measured is between 2.75 Vdc to 7.25 Vdc, then continue with the next step.

(d)  
Do the Rudder Override Operational Test (AMM 27-21-1/501). 1) If you find a problem, do the steps to repair the problem, then do the steps for

Repair Confirmation at the end of this task. 2) If you do not find a problem, continue with the next step.

(e)  
Do the Internal Leak Check for the Rudder PCU (AMM 29-00-0/601). 1) If you find a problem, do the steps to repair the problem, then do the steps for

Repair Confirmation at the end of this task. 2) If you do not find a problem, there was an intermittent fault.
500 
May 01/03  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  27-21-0 Page 111 

(2)  If the STBY RUD ON light is illuminated in the Initial Condition check, do these steps:
(a)  If the LOW PRESSURE A or B light is illuminated on the P5-3 panel, do these steps:
1)  If the LOW PRESSURE A light is illuminated, do the "Pressure Reducer Test" (AMM 22-12-01/501). a) If you find a problem, do the steps to repair the problem, then do the steps
for Repair Confirmation at the end of this task. b) If you do not find a problem, continue with the next step.
2)  If the LOW PRESSURE B light is illuminated, check the following:
a) FLT CONTROL B LOW PRESSURE light b) Flight control panel, P5-3 c) Flight control system B pressure switch d) Standby rudder valve position relay e) FLT CONTROL B switch f) Standby rudder PCU shutoff valve g) Wiring problem h) If you find a problem, do the steps to repair the problem, then do the steps
for Repair Confirmation at the end of this task. i) If you do not find a problem, continue with the next step.
(b)  
If the LOW PRESSURE A or B light is not illuminated on the P5-3 panel, continue with the next step.

(c)  
Open this circuit breaker on the P6 panel and attach a DO-NOT-CLOSE tag: 1) FORCE FIGHT MONITOR

(d)  
If the STBY RUD ON light is illuminated, do these steps:
1) Remove the P5-3 overhead panel (AMM 27-09-45/401).

2)  Do a check of the connector pins and sockets for damage.
a)  If you find any pins that are damaged or bended, do the steps to repair the problem, install the P5-3 panel, then do the steps for Repair Confirmation at the end of this task.
b)  If you do not find a problem, continue with the next step.
3)  Do a check between pin 52 and pin 37 on connector D624 of the P5-3 module for open circuit. a) If it is not open, do a check of the wiring for damage and repair the wiring. 
If no damage is found, replace the K1 AUTO STBY RELAY, then do the steps for Repair Confirmation at the end of this task. b) If it is open, continue with the next step.
500 
27-21-0 Page 112  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 01/03 

4)  Do a check between pin 52 and pin 37 on connector D630 of the P5-3 module for open circuit. a) If it is not open, do a check of the wiring for damage and repair the wiring.  If no damage is found, replace the K21 STBY RUDDER ANNUN RELAY, then do the steps for Repair Confirmation at the end of this task. b) If it is open, continue with the next step. 
5)  Do a check between pin 11 on connect D624 and pin 37 on connector D630 of the P5-3 module for open circuit. a) If it is not open, do a check of the wiring for damage and repair the wiring.  If no damage is found, check the operation of the following switches on the P5-3 module: 
S3 FLT CONTROL SYS A SWITCH - CONTACT GROUP 5 
S4 FLT CONTROL SYS B SWITCH - CONTACT GROUP 5 
S4 FLT CONTROL SYS B SWITCH - CONTACT GROUP 6 
If a fault is found on the switch, replace the faulty switch, then do the steps for Repair Confirmation at the end of this task. 
　
中國航空網 www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：737 AMM 飛機維護手冊 飛行操縱 FLIGHT CONTROLS 1(106)