Honeywell BENDIX/KING KAP 140 Maintenance Manual page 25

2.2.1.3 Manual Trim Runaway Monitor (Pitch not engaged):
If the absolute trim motor drive is greater than 2.7 volt and is in absence of a corresponding MET
trim command for a certification determined time (0.7 or 1.1 seconds). If this condition is detected,
the pitch trim is disabled until a subsequent Preflight test is performed. Pitch modes are still allowed
and manual trim indications made available to the pilot. When a trim runaway is detected, a
continuous audio tone is generated until the AP DISC button is pressed. "PT" is displayed on the
FCC and an external TRIM FAIL annunciation is also illuminated. This monitor runs continuously
when the AP pitch axis is not engaged.
2.2.1.4 Manual Trim Latent Switch Monitor:
If the manual trim up or trim down switch is active for 3 seconds without the corresponding trim arm
switch being active or the manual trim arm switch is active for 3 seconds without a corresponding
manual trim up or trim down switch being active, the manual trim latent switch monitor will
disengage the trim clutch, thus preventing trim operation. After this type of failure, "PT" is displayed
on the FCC and manual trim operation will only be allowed after manual trim up, manual trim down,
and manual trim arm are no longer active. This monitor runs continuously whether the AP mode
is engaged or not.
In units with SW version 01/04 or earlier, this monitor is latched and trim operation (MET and
autotrim) will be disabled until PFT is performed.
Revision 2, Dec/2002
CS:15574F02.IDU
BENDIX/KING
KAP 140
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