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(e) If the STBY RUD ON light is not illuminated, do these steps:
1) Do a check of the linkages between the Torque Tube and the Main PCU for binding or damage. 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) Measure the voltage between pin 1 and pin 2 of connector D10070 on the EE shelf. a) If the voltage measured is not between 2.75 Vdc to 7.25 Vdc, adjust the
rudder main PCU (AMM 27-21-1/501), then do the steps for Repair Confirmation at the end of this task. b) If the voltage measured is between 2.75 Vdc to 7.25 Vdc, then continue with the next step.
3) Do the Rudder Override Operational Test (AMM 27-21-1/501). 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.
4) 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, replace the rudder PCU (AMM 27-21-92/401), then do the steps for Repair Confirmation at the end of this task.
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RUDDER AND RUDDER TRIM CONTROL SYSTEM - MAINTENANCE PRACTICES
1. General
A. The rudder hydraulic systems A, B, and standby must be depressurized prior to performing maintenance on rudder control system components. This is to prevent injury to personnel working in the area of the rudder and it’s associated control linkages. Work stands and equipment must be placed at a distance to allow full rudder deflection when power-on tests are conducted.
WARNING: ALL FLIGHT CONTROL SYSTEMS ARE FULLY POWERED. CHECK TO ENSURE THAT PERSONNEL AND OBSTRUCTIONS ARE CLEAR OF ALL CONTROL SURFACES BEFORE TURNING HYDRAULIC POWER ON. ISOLATE OR TAG ANY SYSTEM NOT BEING TESTED TO PREVENT INJURY TO PERSONNEL OR DAMAGE TO EQUIPMENT.
B. When operating hydraulic system B pumps to pressurize A and B rudder systems the following precautions must be taken:
(1)
At least 1675 pounds (761 kilograms) of fuel is required in the No. 2 fuel tank to provide hydraulic fluid cooling. On hot days or when fuel temperature is known to be above 90oF, monitor the system B overheat indicator and switch pumps off when overheat is indicated.
(2)
Intermittent system B pump operation is limited to five starts of any one pump in a 5 minute period. Following the fifth start run pump for at least 5 minutes or turn pump off for a minimum of 30 minutes.
C. The following procedure covers pressurization of hydraulic systems A and B through operation of electrical driven hydraulic system B pumps only.
2. Rudder Hydraulic Systems A and B Pressurization
A. Equipment and Materials
(1) Ground Lock Assembly - F72735
B. Pressurize rudder hydraulic systems A and B.
(1)
Install ground lock assembly in nose gear.
(2)
Set parking brake.
(3)
Provide electrical power.
(4)
Close FLT CONTR and STDBY RUD circuit breaker on panel P6.
(5)
Position No. 1 or 2 hydraulic system B pump switch, located in forward overhead panel, to ON (Fig. 201)
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