THE NEW PIPER AIRCRAFT, INC.
PA-32-301FT / 301XTC
MAINTENANCE MANUAL
PAGE 1
Jun 1/03
3E7
31-50-00
CENTRAL WARNING SYSTEMS
1. Description and Operation
An annunciator panel mounted in the top center of the instrument panel provides centralized warning for
the following systems: oil pressure, alternator, bus voltage, vacuum, starter, baggage door, pitot heat,
and air conditioning (if installed). Annunciator panel lights are provided only as a warning to the pilot that
a system may not be operating properly. The applicable system indicators (i.e. - gauges) should be
checked and monitored to determine when, or if, any action is required.
Circuit breakers are located on lower right instrument panel.
2. Troub
leshooting (See Chart 1.)
When checking the annunciator panel lighting system, the master switch must be on in order for lights to
operate. Ensure that the appropriate circuit breaker is pushed ON.
NO
TE: Press-to-Test switch tests only the operation of the annunciator light bulbs. It does not test
functioning of the warning circuit.
See 33-10-00, for annunciator panel light bulb replacement procedure.
3. Annunciator Panel (See Figure 1.)
The annunciator panel consists of two rows of eight (8) colored lights which warn of malfunctions in
various circuits or systems. A malfunction is identified by illumination of an individual warning light. There
will typically be eight (8) or nine (9) warning lights (depending on installed options). Power is supplied
from bus bar through a 5 amp ANNUN PANEL ciruit breaker.
VACUUM NO.1 INOP warning light is controlled by a vacuum sensor switch located below the forward
baggage compartment floor and is attached to a vacuum regulator. The switch will activate when
differential pressure from the upper engine-driven vacuum pump (i.e. - NO.1) is below 3.5 in. hg.
VACUUM NO.2 INOP warning light is controlled by a vacuum sensor switch located below the forward
baggage compartment floor and is attached to a vacuum regulator. The switch will activate when
differential pressure from the lower engine-driven vacuum pump (i.e. - NO.2) is below 3.5 in. hg.
OIL PRESSURE warning light is controlled by an oil pressure switch in oil line, located at bulkhead.
Sensor switch will activate when oil pressure is below 35 psi.
ALTERNATOR INOP warning light comes from the alternator winding through a fuse to an alternator out
switch which controls the annunciator light.
BAGGAGE DOOR annunciator lights when baggage door is not properly closed
PITOT HEAT OFF/INOP annunciator lights when pitot heat fails or is selected off.
STARTER ENGAGE annunciator lights to indicate when the starter is engaged.
LOW BUS VOLTAGE annunciator lights to indicate low voltage supply to the bus.
AIR/COND DOOR OPEN ( optional ) annunciator lights when air conditioner door is not properly closed.
The press-to-test button is used to check operation of lights when engine is running. Lights will work
when engine is not running with master switch turned on.
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