Piper ARCHER III Pilot Operating Handbook page 83

PA-28-181, ARCHER ill
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3.5 EMERGENCY PROCEDURES CHECK LIST (continued)
3.Sd Electrical Failures (continued)
To ensure 30-minutes of battery life:
Battery Discharge ..................................................... - l3 Amps Maximum
Pitot Heat.. ................................................... 14 Minutes Usage Maximum
Com Radio ......................................................... 3 Mins Usage Maximum
Fuel Pump .......................................................... 2 Mins Usage Maximum
1.And as soon as possible.
Turning the AL TR switch OFF, reseting the AL TR FIELD circuit
breaker and then turning the AL TR back ON, will reset the overvoltage
relay. If the trouble was caused by a momentary overvoltage condition
(30.5 volts or higher) this procedure should return the ammeter to a normal
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reading .
If alternator does not reset, the battery will become the primary source
of electrical power. The only electrical bus that remains powered in this
load shed configuration is the ESSENTIAL BUS. All electrical items on
the remaining buses will be inoperative (See Figure 7-11), including the
A V1ON1CS dimmer. Display backlighting, therefore, is produced by the
photocell in each display. As battery power is depleted, there may be a
point where the system voltage reduces to a level that is insufficient to
support the required electrical load. In this occurrence, the emergency
battery should activate automatically. If the emergency battery does not
activate automatically, the BAIT MASTR and AL TR switches should
be turned OFF, thereby allowing the emergency battery to be the only
remaining source of electric.al power. Refer to
Failure checklist if EMER BA TT ON advisory illuminates .
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ISSUED: December 22, 2017
EMERGENCY PROCEDURES
Complete Rlectrical
REPORT: VB-2749
SECTION 3
3-19