ARM
PDC SPD
SPEED
EPR
RETARD
THR HLD
1 sec FAST, 1 sec SLOW, 1 sec FAST, 1 sec SLOW (FAST/SLOW needle)
Verify that FAST/SLOW needles deflect to approximately one half scale FAST and SLOW during BITE test 6.
(12)
Verify that after test 6 is completed -
(a)
The autothrottle disengages (A/T arm switch drops).
(b)
The CRT indicates TESTING COMPLETE.
(13)
Terminate the A/T BITE test by paging away from TEST PAGE 4-(X).
591
22-31-01 Page 106 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 20/90
4. Autothrottle System Engage Trouble Shooting Chart
591
Aug 01/94 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 22-31-01 Page 107
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Autothrottle Failed PDC or failed Check results of BITE test Replace appropriate EPR
annunciator shows double of EPR signal(transmitter) 3 - fail transmitter annunciation
ARM and SPEED or ARM and EPR D -fail and/or 3 - pass Replace PDC. If fault persists, replace LH TAT
PROBE.
If unable to enter BITE test Replace PDC
mode
Autothrottle Slipping clutch Measure manual force and Replace Boeing clutch
system drives (Boeing) forces to stop lever and assembly if all three of
one thrust lever restrain lever. (At knob the following conditions
intermittently centerline) exist:
manual force less than
6.0 lbs.
stop force more than
1.5 lbs.
restrain force more
than 0.5 lbs.
Torque Limiter Switch On Smiths servo-
(Smiths) mechanism, replace
NOTE: The clutch limiter switch in the Smith's mechanism is controlled by A/T software in addition to torque limiter switch (Ref 22-31-91). If not corrected, replace torque switch mechanism (Ref 76-11-92).
the torque limiter On either Boeing clutch
switch. Under unusual or Smith's mechanism,
operating conditions, excessive friction may
the software control exist in the thrust control
can cause intermittent system. If all three of the
drive failure in one following conditions exist:
thrust lever manual force less than
6.0 lbs.
stop force more than
1.5 lbs.
restrain force less than
0.5 lbs.,
check thrust lever rub
strip clearances; control
cable tension; verify that
control cable routing is
correct and that foreign
objects are not in cable
loop (e.g. cable
identification tag) (Ref
Chap. 76)
5B8
22-31-01 Jun 20/89
Page 108
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
TROUBLE PROBABLE CAUSE ISOLATION PROCEDURE REMEDY
Autothrottle system fails to drive one thrust lever Autothrottle system fails to drive all thrust levers Thrust lever(s) chatter or do not move smoothly A/T Computer Slipping clutch (Boeing) or Torque Limiter Switch (Smiths) A/T computer Excessive friction in thrust control system Clutch assembly contaminated or out-of-adjustment (Boeing) Torque Limiter Switch out-of-adjustment NOTE: The clutch in the Smiths mechanism is controlled by A/T software in addition to the torque limiter switch. Under unusual operating conditions, a short pulse of higher than normal forces may be experienced when the thrust lever(s) are close to the idle stop(s) Replace A/T computer and run BITE Same as for intermittent failure Replace A/T computer and run BITE Same as for intermittent drive failure Replace switch assembly (Ref 22-31-91) and run A/T BITE Replace A/T Computer Same as for intermittent failure Replace A/T computer Same as for intermittent drive failureIf not corrected, replace torque switch mechanism (Ref 76-11-92)
5B8
Jun 20/84 22-31-01
Page 109
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
AUTOTHROTTLE SYSTEM - MAINTENANCE PRACTICES - DEACTIVATION PROCEDURE
EFFECTIVITY
SA ZS-SIA and on GJ B-2502, B-2503, B-2509 and B-2510
A. General
(1) During operations with intermixed engines, the autothrottle system must be deactivated because the system is not designed to accommodate the differing target EPR's for each engine model simultaneously.
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