SDR 2023F00242

Service difficulty report · Control Unit · Cessna 208B

Difficulty date
July 27, 2023
Submitted
July 27, 2023
Operation
General aviation
Aircraft
N21955
Make and model
Cessna 208B
Aircraft serial
208B5341
Aircraft time
4,000 hours, 4,741 cycles
Engine
Pwc PT6A140
Engine time
4,000 hours, 4,741 cycles
Part
Control Unit
Part number
C6110080101
Condition
Fluctuates
Location
Alternator
Component
Standby Alterna · Cessna
Component part number
91059229
Stage of operation
CR
How discovered
C
Nature of condition
N
Precautionary procedure
O

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

STANDBY ALTERNATOR SHOWS NO INDICATION WHEN GENERATOR IS ONLINE AND STANDBY POWER SWITCH IS IN THE OFF POSITION. ONCE STANDBY ALTERNATOR IS ONLINE BUT NOT THE PRIMARY POWER SOURCE, THERE IS LARGE ERRONEOUS AMPERAGE FLUCTUATION. ONCE GENERATOR IS TRIPPED, THE ALTERNATOR PICKS UP THE LOAD AND DOES NOT FLUCTUATE.

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