PIPER AIRCRAFT, INC.
PA-28-161, WARRIOR III
MAINTENANCE MANUAL
PAGE 1
Nov 30/06
3D1
31-50-00
CENTRAL WARNING SYSTEMS
1. Annunciator (See Figure 1.)
While provisions are made for nine annunciator lights, only five, six, or seven lights are used, depending
on installed options. Refer to Chart 1 for the description and function of each annunciator light.
Power is supplied from the bus through a 5 amp circuit breaker and the annunciator box assembly. The
DAY-NIGHT toggle switch, located to the left of the annunciator panel, is placed in the NIGHT position to
dim the annunciator lights for night flight. This switch also activates the ammeter dimmer relay.
An annunciator PRESS-TO-TEST switch is located to the right of the annunciator panel. With the BATT
MAST switch in the ON position, depressing this switch will illuminate all installed annunciator lights.
2. Troubleshooting
Should any annunciator light(s) fail to illuminate as expected, refer to Chart 2.
Nomenclature Color Event
LOW BUS VOLTAGE RED Illuminates when the electrical system drops
from bus voltage (28 Vdc) to battery voltage
(24.5 Vdc).
PITOT HEAT OFF/INOP AMBER Illuminates when the pitot heat fails or is
(Optional) selected OFF.
STARTER ENGAGE RED Illuminates when engine starter is engaged.
VACUUM INOP AMBER Illuminates when the vacuum sensor switch
on the firewall is activated. The vacuum
sensor switch is attached to a regulator, set
to close when pressure falls below 3.5
inches of Hg.
ALTERNATOR INOP RED Illuminates when the alternator fails or is
selected OFF.
STBY ALTR ON AMBER Illuminates when the standby alternator is
(w/ Stby. Altr. installed) engaged.
OIL PRESSURE AMBER Illuminates when the in-line oil pressure
sensor switch, located at the firewall, senses
oil pressure has fallen below 35 psi.
CARB ICE RED Illuminates when ice forms in carburetor
(Optional) throat. Adjusted by sensitivity control knob
on carburetor heat panel
BLACK LINE GREEN Blank. - Not Used.
CHART 1
ANNUNCIATOR DESCRIPTION AND FUNCTION
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