Service difficulty report · Control Unit · Cirrus SR22

Difficulty date
April 27, 2024
Submitted
May 3, 2024
Operation
General aviation
Aircraft
N75MG
Make and model
Cirrus SR22
Aircraft serial
0657
Aircraft time
2,827 hours
Engine
Cont IO550N
Propeller
Hartzl PHCC3YF1
Part
Control Unit
Part number
UNKNOWN
Condition
Burned
Location
Zone 200
Part time
2,827 hours
Stage of operation
CR
How discovered
O
Nature of condition
B
Precautionary procedure
A

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

What was found

COMPLETE ELECTRICAL FAILURE EN-ROUTE FROM KGTF TO 6S8. STARTED WITH ATC REPORTING MODE C FAILURE; RECYCLED TRANSPONDER. ATC UNABLE TO RECEIVE MODE C; AVIONICS POWER RECYCLE. PANEL LIGHTS FLASHED, GPS/MFD/PFD FLICKERED. BATTERY AND ALTERNATOR GAUGES OK FOR APPROX. 1 MIN THEN BATTERY VOLT INDICATED <20 VOLTS. REPORTED TO ATC INTERMITTENT POWER ISSUES. MFD/PFD/NAV/COMM ONLINE BRIEFLY AS TROUBLESHOOTING INITIATED. CIRCUIT BREAKERS POPPED, ELECTRICAL SYSTEMS ALL OFFLINE WITH LOSS OF FLAPS, TRIM CONTROL, NAV, AND COMM. TURNED OFF ALL ELECTRICAL (BAT1, BAT2, ALT1, ALT2), AND NAVIGATED TO 6S8 WITH FOREFLIGHT/CELLULAR. AVIATED WITH LITHIUM-POWERED BACKUP OF AIRSPEED/ATTITUDE/ALTITUDE. MADE TRAFFIC CALLS WITH HANDHEAD RADIO AT NON-TOWERED 6S8. LANDED WITHOUT FLAPS OR TRIM CONTROL. MECHANIC INVESTIGATED AND SAW BURNED-OUT/CHARRED MCU.

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