Cirrus SR22 SDRs

The following is derived from maintenance facility submissions to the FAA’s Service Difficulty Reports database.

Editorial Staff

Thursday, December 12, 2024 at 08:01 AM ET

Verified

Key Takeaways:

Mechanical failures observed include a throttle stuck due to a broken alternate air flapper valve and excessive elevator play caused by a loose pitch trim motor assembly with backed-out mounting screws, a known recurring issue.
Electrical problems ranged from tripped circuit breakers for critical systems caused by corroded and melted data logger wiring.
The Master Control Unit was implicated in two separate significant electrical failures, one involving a loss of power post-maintenance and another a complete en-route system shutdown due to a charred unit.

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Stuck Throttle

Broken Alternate Air Valve

Pilot reported throttle stuck half way open during flight. Disassembled wye pipe housing the alternate air flapper valve and filter. Discovered most of the flapper valve broken off and lodged in the throttle body, preventing the throttle from closing. Installed new alternate air flapper valve assembly (p/n 15710-002). The failure seems to originate where the radius of the hinge meets the flat surface of the valve on either side of the sandwiched flapper.