(2)
See 22-04-10 for complete details of the A/T BITE operation.
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737-300/400/500MAINTENANCE MANUAL
AUTOTHROTTLE SYSTEM - TROUBLE SHOOTING
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1. General
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A. Malfunctions or failures of the A/T system can be identified by the FMS BITE (Built-In Test Equipment) procedures, contained in Chapter 22. FMS BITE includes procedures for the FMCS, DFCS, A/T, IRS, and EFIS (if applicable).
B. If malfunctions or failures are thought to be related to the mechanical mechanisms of the A/T system, the trouble shooting chart in Para. 3 can be used.
C. The FMS BITE is started and controlled through the FMCS CDU. The CDU acts as the focal flight deck control and display for actuating and evaluating FMCS, DFCS, A/T, IRS, and EFIS BITE (if applicable), (Ref 22-01, FMS BITE - D&O). Once the test has been started from the CDU, the system under test will transmit plain text messages for display on the CDU. In response to the messages, you can set the flight deck controls, and/or do the data entries through the CDU. Test complete or failure is shown on the CDU display.
2. Trouble Shoot A/T System Using A/T BITE
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A. Do the A/T BITE trouble shooting per 22-04, A/T BITE - T/S.
NOTE: The trouble shooting procedures for FMCS, DFCS, IRS, and EFIS
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(if applicable) are in these sections:
FMCS BITE - T/S, 22-02
DFCS BITE - T/S, 22-03
IRS BITE - T/S, 22-05
EFIS BITE - T/S, 22-07
B. At the end of all the BITE tests, push the INIT/REF key on the CDU to go out of the BITE.
C. The A/T system may disengage when electrical power is transferred after a flight where the autopilot or flight director was used during landing. This condition is normal, and no maintenance action is required. You can reset the A/T warning light by pushing the A/T warning light, or by pushing the A/T engage (ARM) switch.
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A 737-300/400/500MAINTENANCE MANUAL
3. Trouble Shoot A/T System Mechanical Mechanisms
______________________________________________ ~.............................................................................. | Trouble | Probable Cause | Isolation Procedure | Remedy | ................................................................................ |Autothrottle |Torque limiter |Do the torque switch |If the torque switch | |System drives |switch opens and |Interactive (Input |stays open or in the | |one thrust |causes the servo |Discrete) test (Ref. |high throttle lever | |lever |actuator clutch |22-04-01 or 22-04-11)|forces, replace the | |intermittently |to disengage. |The torque switch |torque switch (Ref | | |The condition can|should go to the |22-31-91/401). | | |be caused by: |"closed" position |If the problem stays | | | |after the test. Do |the same, replace the | | |The Torque |another check on some|torque switch | | |Limiter switch is|other positions of |mechanism (Ref 76-11- | | |out of adjustment|the throttle lever |03/401). Do a check | | |(Smiths) |travel. |on the thrust lever | | | | |rub strip clearance. | | |Internal or |NOTE: If the throttle|Make sure the thrust | | |external of the |levers move to the |lever moves freely. | | |torque switch |aft stop fast, the |Do a check on the | | |mechanism. |torque switch is |cable control for the | | | |still open. This |correct tension. Make| | |Too much friction|shows that the torque|sure there is no | | |in the control |switch is O.K. The |object in the cable | | |cable system |torque switch bypass |loop (Ref chapter 76) | | |forward of the |circuit will adjust |that can cause problem| | |torque switch |for this condition |for the throttle | | |mechanism. |during usual A/T |movement. | | | |operation | | | | |(Ref 22-31-00) |The low operation | | | | |forces of the torque | | | | |switch shows that a | | | | |problem occurs in the | | | | |torque switch or the | | | | |torque switch | | | | |mechanism. | | | | |Replace the torque | | | | |switch (Ref 22-31-91/ | | | | |401). If the problem | | | | |stays the same, | | | | |replace the torque | | | | |switch mechanism | | | | |(Ref 76-11-03/403). | | | | | |
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