R GEN DISTRIBUTION CIRCUIT BREAKER CIRCUIT BREAKER COMPONENTS
CIRCUIT BREAKERS  PULLED  ACTIVATED  MALFUNTION  REMARKS 
Essential (1 OOA) L Main (100A) R Main (100A)  Yes Yes  Yes  Shorted diode on essential bus fromLeft Dist.  No power should be observed 
L Gen Tie Bus(200A)  Yes  Bus  on L & R Main bus 
Essential (100A) L Main (100A) R Main (100A) L Gen Tie Bus (200A)  Yes Yes Yes  Yes  Shorted diode on L Mainbus from Left Dist. Bus  No power should be observed on Essen & R Main bus 
Essential(100A) L Main (100A)  Yes Yes  Shorted diode on R Main bus  No power should be 
R Main (100A)  Yes  from Left Dist.  observed 
L Gen Tie Bus (200A)  Yes  Bus  on Essen & L Main bus 

5. Main Bus TieCircuit Breaker and Crossfeed Diode Check
This check ensures that generator (electrical)power is routed through the left and right distribution buses to the left main, right main, and essential buses. (refer to Chart 3)
NOTE: All 200A tie bus breakers must be activated during this check.
CHART 3
MAINTIE BUS CIRCUIT BREAKER AND CROSSFEED DIODE CHECK (Sheet 1 of 2)
LEFT DIODE / CIRCUIT BRAKER OPERATION CHECK

R GEN DISTRIBUTION CIRCUIT BREAKER CIRCUIT BREAKER COMPONENTS CIRCUIT BREAKERS PULLED ACTIVATED CHECKED REMARKS
Essential (100A) Yes Feeder diodes Observethe L Main (100A) Yes and circuit equipment R Main (100A) Yes breakersattached operated
to L Gen DistBus  by the appropbus is powered

L Gen Distribution Circuit Breakers
Essential (100A) Yes L Main (100A) Yes R Main (100A) Yes
EFFECTIVITY:
040-999

Jan 109024-60-00
PIPERAIRCRAFT
PA-42-720 (Advanced Tralner)
MAINTENANCEMANUAL

A. DCElectricalLoad Distribution (continued)
CHART 3
MAIN TIE BUS CIRCUIT BREAKER AND CROSSFEED DIODE CHECK (Sheet 2 of 2)
RIGHT DIODE / CIRCUIT BREAKER OPERATION CHECK

L GEN DISTRIBUTION CIRCUIT BREAKER CIRCUIT BREAKER COMPONENTS
CIRCUIT BREAKERS  PULLED  ACTIVATED  CHECKED  REMARKS 
Essential (100A) L Main (100A) R Main (100A)  Yes Yes Yes  Feeder diodes and circuit breakersattached Observethe equipment operated 

to R Gen Dist Bus by the
appropbus
is powered

R Gen Distribution Circuit Breakers
Essential (100A) Yes L Main (100A) Yes R Main (100A) Yes
6. Left and Right Circuit Breaker Panels
The left and right circuit breaker panels are attached to mounting bracketsto the left and right of the instrument panel. The circuit breakers allow the crew to isolate individual electricalsystemsin the event of trouble.
The left circuit breaker panel assembly consistsof three individualpanels. The top panel contains indicatorlightsfor left pitot heat, right pitot head, and stall warning heat, prop/inlet deice switch, ammeter,andthe left main circuit breakers. The center containsessentialbus circuit breakers, andthe lower panel contains the ac circuit breakers.
The right circuit breaker panel assembly consists of three individual panels. The top panel containsan engine hour meter, wing and tail surface deice indicator lights, and the right main circuit breakers. The center panel contains the nonessential bus circuit breakers, and the bottom panel contains the avionics circuit breakers.
plastic, and circuit breakers Breakersused in the ac circuit breaker panel are Wood Electric circuit breakers withthreaded terminals.
All panels are electroluminescent are Wood Electric, plug-in type.
EFFECTIVITY: 040-999
24-60-00 PAGE 5
Jan 10/90

PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL

A. DC Electrical Load Distribution (continued)
7. Removal of Plug-in Type Circuit Breakers
WARNING: ENSURE THAT BATTERY MASTER SWITCH AND THE GENERATOR SWITCHES ARE IN THE OFF POSITION WHEN WORKING ON THE CIRCUIT BREAKERPANEL.
(a)
Remove desired cover panel from auxiliary circuit breaker panel.

(b)
Unplug desired circuit breaker from bus bar.

8. Installation of Plug-in Type Circuit Breakers
WARNING: ENSURE THAT BATTERY MASTER SWITCH AND THE GENERATOR SWITCHESARE IN THE OFF POSITION WHEN WORKING ON THE CIRCUIT BREAKER PANEL.
(a)
Verify the circuit breaker is of the correct amperage.

(b)
Plug circuit breaker into bus bar.

(c)
Repalcecoverpanel.

9. Removal of Screw Connect Type Circuit Breakers
WARNING: ENSURE THAT BATTERY MASTER SWITCH AND THE GENERATOR SWITCHES ARE IN THE OFF POSITION WHEN WORKING ON THE CIRCUIT BREAKER PANEL.
(a)
Remove panel cover from ac circuit breaker panel.

(b)
Removetwo screws securing circuit breaker support bracket. Withdraw support bracket from panel assembly with circuit brakers attached.
　
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