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% % % % % Figure 2: Electrical Switches and Circuit-Breakers %
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Electrical Power
AMM
% Trouble-Shooting
% 1. General
% Make sure that the alternator is supplying power and that there is 14 VDC on the Main Bus. Refer to
% Section 24-33. For faults on a piece of equipment, or a system, refer to the applicable Chapter. For
% example, for no oil pressure indication, see Chapter 77 Engine Indicating. The table below lists the
% defects you could have with the DC load distribution system. If you have the trouble detailed in the
% Trouble column, read across to the Possible Cause column. Then do the repair given in the Repair
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Trouble Possible Cause Repair
There is 14 VDC on the main Avionic master switch set to Set the avionic master switch
bus but not on the avionic bus. OFF. AV. BUS circuit-breaker not set. Avionics master relay defective. A failure of the cables which connect the main bus to the avionics bus. to ON. Set the AV. BUS circuit breaker. Replace the avionics master relay. Do a continuity test of the cables. Refer to Chapter 92 for the wiring diagrams. Repair/replace defective cables.
There is 14 VDC on the Avionic master switch set to Set the avionic master switch
essential bus but not on the OFF. to ON.
essential avionic bus. ESS AV. circuit-breaker not set. Essential avionics relay defective. A failure of the cables which connect the essential bus to the essential avionic bus. Set the ESS AV. circuit-breaker. Replace the essential avionics relay. Do a continuity test of the cables. Refer to Chapter 92 for the wiring diagrams. Repair/replace defective cables.
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DA 40 Series
Trouble Possible Cause Repair
There is 14 VDC on the main MAIN TIE circuit-breaker not Set the MAIN TIE circuit
bus but not on the essential set. breaker.
bus with the essential bus ESS TIE circuit-breaker not Set the ESS TIE circuit
switch set to OFF. set. Essential tie relay defective. A failure of the cables which connect the main bus to the essential tie relay and essential bus. breaker. Replace the essential tie relay. Do a continuity test of the cables. Refer to Chapter 92 for the wiring diagrams. Repair/replace defective cables.
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