Arrow PA-28R-201 Pilot's Operating Handbook And Faa Approved Airplane Flight Manual page 275

PIPER
AIRCRA~T
CORPORATION
PA-28R-201, ARROW
Figure 7-1 (cont)
SECTION 9
SUPPLEMENT
7
3. GLIDESLOPE (OS) ANNUNCIATOR- Illuminates continuously
whenever the autopilot is coupled to the glideslope signal. The GS
annunciator will flash if the glideslope signal is lost (GS flag in COl
or absence of glideslope pointers in KI 525A). The autopilot reverts
to pitch attitude hold operation. If a valid glideslope signal returns
within six seconds, the autopilot will automatically recouple in the
GS mode. If the valid signal does not return within six seconds, the
autopilot will remain in pitch attitude hold mode until such time
. that a valid glideslope returns and the aircraft passes thru the
glideslope. At that point OS couple will re-occur.
4. TRIM WARNING LIGHT (TRIM) - Illuminates continuously
whenever trim power is not on or the system has not been preflight
testj:d. The TRIM warning light flashes and is accompanied by an
audible warning whenever a manual trim fault is detected. The
Manual Trim System is monitored for the trim servo running
without a command. The TRIM warning light will illuminate
steady and be accompanied by a steady audible tone whenever an
autolrim failure occurs. The autotrim system is monitored for the
following failures: trim servo running without a command; trim
servo not running when commanded to run; trim servo running in
the wrong direction. The pitch trim circuit breaker may be cycled off
to silence the continuous tone but the trim fail light will
remain on. The manual electric trim may be used but the autopilot
should not be engaged.
5. AUTOPILOT ANNUNCIATOR (AP) -Illuminates continuously
whenever the autopilot is engaged. Flashes approximately 12 times
whenever the autopilot is disengaged (an aural alert will also sound
for 2 seconds).
6. AUTOPILOT ENGAOE (AP ENG) BUTTON - When pushed,
engages autopilot if all logic conditions are met.
7. PREFLIG HT TEST (TEST) BUTTON - When momentarily
pushed, initiates preflight test sequence which automatically turns
on all annunciator lights, tests the roll and pitch rate monitors, tests
the autotrim fault monitor, checks the manual trim drive voltage
and tests all autopilot valid and dump logic. If the preflight is
successfully passed, the AP annunciator light will flash for approxi-
mately 6 seconds (an aural tone will also sound simultaneously with
the annunciator flashes). The autopilot cannot be engaged until the
autopilot preflight tests are successfully passed.
ISSUED: SEPTEMBER 15, 1988 REPORT: VB-1365
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