22-31-00
ALL ú ú 03 Page 102 ú Mar 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
~.............................................................................. | Trouble | Probable Cause | Isolation Procedure | Remedy | ................................................................................ |Autothrottle |The A/T computer |Replace the A/T |Replace the A/T | |system does not| |computer and do the |computer | |drive one | |A/T BITE test | | |thrust lever | |Same as for the |Same as for the | | | |intermittent failure |intermittent failure | | |The torque | | | | |limiter switch | | | | |(Smiths) | | | ................................................................................ |Autothrottle |The A/T computer |Replace the A/T |Replace the A/T | |system does not| |computer and do the |computer | |drive all the | |A/T BITE test | | |thrust levers | | | | ................................................................................ |Thrust lever(s)|Too much |Same as for the |Same as for the | |chatter or do |friction in the |intermittent drive |intermittent drive | |not move |thrust control |failure |failure | |smoothly |system | |replace the torque | | | | |switch | | |The torque |Replace the torque |If not corrected, | | |limiter switch is|limiter switch |replace the torque | | |out-of-adjustment|(Ref 22-31-91/401) |switch mechanism | | |(Smiths) |and do the A/T BITE |(Ref 76-11-03/401) | | | |test | |
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22-31-00
ALL ú ú 01 Page 103 ú Mar 15/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
~.............................................................................. | Trouble | Probable Cause | Isolation Procedure | Remedy | ................................................................................
|Autothrottle |Torque switch/ |With the two throttle|Repair the circuit. |
|system does not|servo |levers in mid-range |actuator |
|drive one or |interface |and no force applied,| |
|two thrust | |do a check for the | |
|lever from its | |continuity to ground | |
|aft stop | |at pins U and K of | |
| | |the two A/T servo | |
| | |actuator connectors | |
| | |D1667 and D1669. | |
| | |With a force of more | |
| | |than 2 pounds applied| |
| | |and stayed on the | |
| | |left throttle lever, | |
| | |do a check for an | |
| | |open circuit at pin U| |
| | |to ground and the | |
| | |continuity to ground | |
| | |at pin K of the | |
| | |connector D1667. | |
| | |With a force of more | |
| | |than 2 pounds applied| |
| | |and stayed on the | |
| | |right throttle lever,| |
| | |do a check for an | |
| | |open circuit at pin U| |
| | |to ground and the | |
| | |continuity to ground | |
| | |at pin K of the | |
| | |connector D1669. | |
................................................................................ |Unable to |Total Air |Check inflight faults|Repair any problems | |engage V NAV & |Temperature (TAT)|and current status in|that you find. | |A/T Limit Light|probe is |A/T bite interactive | | |On |defective |FMA/EFIS. If there | | | | |are no faults, do the| | | | |FMC BITE test. | |
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