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27-21-00
ALL ú ú 01 Page 107 ú Jul 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
High rudder Possible binding Remove all hydraulic power. Replace the
pedal forces in the control Disconnect the input control standby actuator.
or standby actuator. linkage to the lever. rod from the standby input rudder power Adjust and test
Rudder pedals Measure the force required to control unit, yaw
kick back during move the lever throughout its damper and rudder
flight range of motion. This force, pressure reducer
or when applied tangentially at as necessary.
drives the rudder pedals Yaw damper back- than one pound. centerline, must not be more approximately the bolt/clevis damaged components that you find. Replace the
Troubleshoot for damaged
or rudder power control unit,
Rudder moves or yaw damper and rudder
airplane dutch pressure reducer (on airplanes
rolls with yaw that have one installed in
damper engaged supply line to the main the "A" hydraulic system
or rudder power control unit).
Irregular rudder (FIM 22-12-00/101,
pedal steering AMM 22-12-32/501,
on ground. linkage of the main PCU. of the input Possible binding ____NOTE: than 40 pounds, just prior to when applied tangentially at AMM 27-21-96/401). AMM 27-21-91/401 thru pressure mode. reducer has failed in the low low or the rudder pressure hydraulic system pressure is panel, indicates the related light shown on the P5 overhead A FLIGHT CONTROL LOW PRESSURE the manifold stops. the input crank bottoming on centerline, must not be more approximately the bolt/clevis range of motion. This force, move the lever throughout its Measure the force required to Disconnect input rod from PCU Remove all hydraulic power. lever. Replace the main PCU. (AMM 27-21-91/401)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
27-21-00
ALL ú ú 01 Page 108 ú Jul 12/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
RUDDER AND RUDDER TRIM CONTROL SYSTEM - MAINTENANCE PRACTICES
_____________________________________________________________
1. General_______
A. This procedure contains two tasks. The first task contains the data necessary to pressurize hydraulic systems A, B and standby. The second task contains the data necessary to remove the pressure from hydraulic systems A, B and standby.
B. Hydraulic systems A, B and standby must have the pressure removed before maintenance is done on the rudder control system. This is to prevent injury to persons because of accidental operation of the control system while you do maintenance. You must be careful to put maintenance stands and equipment away from control surface travel.
C. Electric pump 1 pressurizes hydraulic system B and electrical pump 2 pressurizes hydraulic system A. Electric pump 1 heat exchanger is installed in the fuel tank 2. Electric pump 2 heat exchanger is installed in fuel tank 1. When you operate the hydraulic pumps to pressurize the hydraulic systems, you must obey these steps:
(1)
Make sure not less than 250 gallons (1675 pounds/760 kilograms) of fuel is contained in fuel tank 1 or 2 to absorb the unwanted heat from the hydraulic fluid. On hot days, or when fuel temperature is known to be aobve 90°F (32.2°C), monitor the system B overheat indicator and turn pumps off when the hydraulic fluid becomes too hot.
D.
This procedure contains pressurization of hydraulic system A and B by operating the electric hydraulic system A or B pumps. Pressurization of the hydraulic systems with the engine-driven hydraulic pumps is not given.
TASK 27-21-00-802-002
2. Rudder Hydraulic System A and B Pressurization______________________________________________
A. Special Tools and Equipment
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