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:

A broken alternate air flapper valve lodged in the throttle body caused a stuck throttle.
Excessive elevator play was found to be due to a loose pitch trim motor assembly, identified as a recurring issue.
Two distinct incidents of Master Control Unit failure led to significant electrical power loss or complete system shutdown.
Damaged and corroded data logger wiring connectors caused specific circuit breakers for the stall warning and fuel quantity to trip.

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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.