Avionics Master And Emergency Switch Circuit Description And Operation - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
MAIN ELECTRICAL BUS
RADIO MASTER (2)
50 AMP
RADIO MASTER (1)
50 AMP
ALT. 1 BUS POWER
50 AMP
TO GABLES
CONTROL PANEL
AVIONICS BUS 1
AVIONICS BUS 2
Figure 12-9. Avionics Master and Emergency Switch Circuit
12-10. AVIONICS MASTER AND EMERGENCY SWITCH CIRCUIT. (Refer to Figure 12-9. )
12-11. DESCRIPTION AND OPERATION. Electrical power for the various avionics components is
controlled by the Avionics Master Switch located in the Gables Control Panel. This switch operates a solenoid
which, when engaged, provides power from the main Electrical Bus to the #1 and #2 Avionics Busses. This
circuit is protected by two 50 amp circuit breakers (Radio Master #1 and Radio Master #2) on the Main
Electrical Bus.
In the event of a malfunction in the Avionics Master Switch circuit, a 50 amp Emergency Switch (circuit
breaker) is provided between the Main Electrical Bus and the #1 Avionics Bus. With this circuit breaker
engaged, power is supplied directly to the #1 Avionics Bus, allowing the avionics components operating off of
this bus to be used. The Emergency Switch does not supply electrical power to the #2 Avionics Bus and all
components utilizing this bus will be inoperative.
THIS SPACE INTENTIONALLY LEFT BLANK
Revised: 3/31/94
ELECTRONICS
4A23