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3. Yaw Damper System BITE Test Trouble Shooting Charts
A. The BITE tests have been designed primarily for yaw damper system verification. The tests are not intended for isolating failures to the line replaceable unit (LRU); however, failed BITE tests or combination of tests provide some clues useful for trouble shooting to the most likely faulty LRU.
B. ALL BITE tests should be run first and failed tests noted (Refer to Yaw Damper System -Adjustment/Test). Components involve in each test have an X listed under the appropriate test. In most cases, failure of any of the BITE tests requires replacement of the unit being tested. If the additional tests are filed after replacement of the unit, or if all tests fail involving the engaged interlock circuits, the interlock circuits should be checked and verified before replacing additional LRU's. Hydraulic power control unit components are assumed to be part of the engage interlocks. The following charts assume only single failures with the most likely failures listed from the top down for each test.
C. Yaw Damper Coupler BITE Test Chart
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YAW DAMPER SYSTEM - ADJUSTMENT/TEST
EFFECTIVITY
SA ZS-SIA and on SD ST-AIB and on WA N235WA thru N241WA GJ B-2509 and B-2510 Except aircraft with coupler P/N 4084042
1. General
NOTE: For aircraft with coupler P/N 4084042 installed (incorporating SB 27A1206), see 22-12-01.
A. The successful completion of these tests ensures that the yaw damper system is fully operable. It is assumed that all systems furnishing signal data to the yaw damper are in proper working order and that the rudder control systems are properly rigged.
2. Prepare to Test Yaw Damper System
A. Provide electrical power to airplane and energize load control centers P6 and P18.
B. Energize hydraulic systems A and B and ensure flight control system A and B switches are positioned to ON.
C. Ensure following circuit breakers on load control center are closed.
MASTER CAUTION BUS (2)(P6)
MASTER DIMMING BUS INDICATOR LIGHTS (9)(P6)
DIM AND TEST (P6)
YAW DAMPER AC (P18)
YAW DAMPER DC (P18)
ENG INTLK (P18)
3. Test Yaw Damper System
A. Test Yaw Damper Indicator Lights
(1)
With yaw damper disengaged, observe that YAW DAMPER warning light located on overhead panel and two MASTER CAUTION lights and FLT CONT annunciator light located on light shield are illuminated.
(2)
Place LIGHTS switch on center instrument panel first in DIM position then in BRT position. Observe that YAW DAMPER warning light dims and then illuminates brightly.
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(3)
Press either MASTER CAUTION light. Observe that both MASTER CAUTION lights and FLT CONT annunciator light go out and YAW DAMPER warning light remains illuminated.
(4)
Momentarily depress annunciator light. Observe that both MASTER CAUTION lights and FLT CONT annunciator light comes on.
NOTE: Disregard other master caution annunciator lights that illuminate.
B. Test Yaw Damper Interlocks
(1)
Engage YAW DAMPER engage switch. Observe that YAW DAMPER warning light extinguishes after approximately 2 seconds and both MASTER CAUTION lights extinguish.
(2)
Open YAW DAMPER AC circuit breaker. Observe that YAW DAMPER warning light illuminates, YAW DAMPER engage switch disengages after approximately 2 seconds, and rudder does not deflect more than 1/2 degree.
(3)
Close YAW DAMPER AC circuit breaker and engage YAW DAMPER engage switch. Within 2 seconds momentarily open and close ac circuit breaker. Observe that engage switch remains engaged, YAW DAMPER warning light illuminates immediately and remains on for approximately 2 seconds.
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