(e)
Display test
(4)
Other Functions
(a)
System configuration
1) Configuration parameters
(b)
I/O monitor
1) Analog inputs and outputs
2) Discrete inputs and outputs
(c)
Output control 1) Yaw damper servo control 2) Yaw damper switch control 3) Pressure reducer control 4) Low hydraulic pressure lamp control
C. Use Existing Faults and Fault History to help isolate a faulty component. If necessary, use Ground Tests to confirm a fault. After a component replacement, use Ground Tests to verify that the fault is fixed.
(1)
The servo test uses hydraulic power to sweep the rudder from one side to the other two times. This provides a dynamic test of yaw damper functions.
(2)
The pressure reducer test checks the hydraulic pressure at the inlet to the rudder PCU. The pressure goes from high to low two times, and is checked at each stage. This tests the pressure reducer actuator, the pressure sensor, and the A system low pressure warning.
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D. Use Other Functions when you need specific data for any of a variety of parameters, or need a specific control function. Other Functions allows the selection of a specific parameter or operation without the entire sequence of steps performed in Ground Tests. It also allows you to go a lower level so you can see the actual values of many parameters that are checked at a higher level in Ground Tests, but are not displayed at that level.
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737-300/400/500MAINTENANCE MANUAL
YAW DAMPER SYSTEM - TROUBLE SHOOTING
____________________________________
1. General
_______
A. The yaw damper system trouble shooting procedure shows how to use the existing faults and the fault history functions of yaw damper BITE. The table that follows the BITE operation instructions shows the fault messages that can show on the yaw damper coupler display. Corrective actions are shown for each fault message.
B. The existing faults function is usually the best procedure to find a fault. Do these steps:
(1)
Go to EXISTING FAULTS.
(2)
Go to MORE DETAILS.
(3)
Find the fault message number.
(4)
Find the LRU that caused the fault.
(5)
Correct the fault.
(6)
Do the test that makes sure the fault is corrected.
2. BITE (Built-In Test Equipment)
____
A. Do these steps to look for fault messages in EXISTING FAULTS (Fig. 101):
(1) Push the ON/OFF key on the front of the yaw damper coupler (E1-3).
(a)
Make sure that the display shows ENTER BITE?
(b)
Push the YES key on the keypad within ten seconds. 1) Make sure that the A/P warning lights on the autoflight
status annunciators (P1 and P3) come on. 2) Make sure that the display shows EXISTING FAULTS?
(2) Push the YES key.
(a)
If the display shows NO FAULTS, then there are no existing faults. Push the MENU key. 1) Make sure that the display shows EXISTING FAULTS? 2) If you want to see a record of fault messages on flights
that occurred before this flight, do this step: a) Go to the steps for FAULT HISTORY in the subsequent section of this procedure. 3) Ignore the remaining steps for EXISTING FAULTS.
(b)
If the display shows a fault message and you want more details, push the down arrow key.
NOTE: These are the four fault details that MORE
____ DETAILS? contains: Detail 1 shows the message number. Detail 2 shows the flight deck effect. Detail 3 shows the LRU(s) that caused the fault. Detail 4 shows if the fault is latched or not.
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