breakerpanel.Checkthatequipmentpoweredbyleftmainbuscontinuestofunction.If or on
left
main
bus
power
is
lost,
diode
or circuit
breaker
on connecting
wire
P1A-6
is
open
and
mustbereplacedorreset.
(4.) Pushin leftmaincircuitbreaker.Pulloutrightmaincircuitbreakeronleftsideof main breakerpanel.Checkthatequipmentpoweredbyrightmainbuscontinuestofunction.If right mainbuspowerislost,diodeorcircuitbreakeron connectingwire P1D-6is open andmustbereplacedor reset.
(5.) Pushin rightmaincircuitbreaker.Pulloutrightmaincircuitbreakeronrightsideof main breakerpanel.Checkthatequipmentpoweredbyrightmainbuscontinuestofunction.If rightmainbuspoweris lost,diodeorcircuitbreakeronwireP1C-6isopenandmustbe
replacedorreset. Pushin rightmainbreaker.
(6.) Puefll buspower
outesseial circuitbreakeronleftsideofmainbreakerpanel.Ifessential
islost,diodeor circu breaker wireP orreset.
on -6 isopenandmustbereplaced
replacedorreset. Pushin essentialbreaker.
EFFECTIVITY:
(4.) Push in left main circuitbreaker. Pull out right main circuitbreaker on left side of main040999
and must be replaced or reset. Jan 10/90PAG
24-60-00
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL
A. DCElectricalLoad Distribution (continued)
4. ElectricalPower Distribution SystemTest (continued)
(b) Test for shorteddiodes as follows, refer to Chart 2:
(1.) Place the battery master switch in the ON position.
(2.) Start left engine only and run at approximately pushed in.
68% N1 with all circuit breakers (3.) Place the left generator switch in the ON position. (4.) Pull out the right generatorbus tie circuit breaker on the main circuit breaker panel. (5.) Pull out both right main and both essential bus circuit breakers on main circuit breaker panel. (6.) Check that the equipment powered by essential and right main buses are inoperative. (7.) If essential and right main bus power is stall present, diode on connecting wireP1 B-6 of left main bus is shorted. (8.) Push in essential bus circuit breaker, and pull out left main bus circuit breaker on left side of main breaker panel. (9.) Check that the equipment on left and right main buses are inoperative. (10.) If left and right main bus power is still present, diode on connecting wire P1G-6 of essentialbus is shorted. (11.) Push in right main circuit breakerand pull out left main and essential circuit breaker on left side of main breaker panel. (12.) Check that the equipment on left main and essential buses are inoperative. (13.) If left main and essential bus power is still present, diode on connecting wire P1D-6 of rightmain bus is shorted. (14.) Push in all breakersand start right engine; shut down left engine. (15.) Repeat the above procedure for the right generator by pulling out left generator bus tie breakeron main circuit breaker panel. With right generator switch on, repeat steps (5.) through (13.), pulling the right main, essential bus, and left main circuit breakers onright side of main breaker panel. PUlling these breakers will test for shorts in diodes on connectingwires P1A-6, P1F-6, and P1C-6 respectively. (16.) Push all breakers in and shut down right engine.
CHART 2 ELECTRICAL POWER DISTRIBUTION DIODE OPERATIONAL CHECK (Sheet 1 of 2)
L GEN DISTRIBUTION CIRCUITBREAKER CIRCUIT BREAKER COMPONENTS
CIRCUIT BREAKERS PULLED ACTIVATED MALFUNTION REMARKS
Essential (100A) L Main (100A) R Main (100A) R Gen Tie Bus (200A) Yes Yes Yes Yes Shorted diode on essentialbus from Right Dist. Bus No power should be observed on L & R Main bus
Essential (100A) L Main (100A) R Main (100A) R Gen Tie Bus (200A) Yes Yes Yes Yes Shorteddiode on L Main bus from Right Dist. Bus No power shouldbe observed on Essen & R Main bus
Essential (100A) L Main (100A) R Main (100A) R Gen Tie Bus (200A) Yes Yes Yes Yes Shorteddiode on R Main bus from Right Dist. Bus No power should be observed on Essen & L Main bus
EFFECTIVITY:
24-60-00
JanJan10/901090
PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCEMANUAL
A. DCElectricalLoad Distribution (continued)
CHART 2
ELECTRICAL POWER DISTRIBUTION DIODE OPERATIONAL CHECK (Sheet 2 of 2)
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