Cessna 172R/S, (T)182T and (T)206H Aeroplanes with Garmin G1000 Avionics - Master Switch Failure
- Published
AI-generated summary of the official EASA document. Verify against the PDF before acting.
What to do
Owners and operators should replace the avionics master switch every 500 hours as per Cessna Service Bulletin SB11-24-02. If avionics fail to power up correctly, they should inspect the switch for signs of failure and follow abnormal or emergency procedures if failures occur in flight. Any identified failures must be repaired before further flight.
Summary
The Special Airworthiness Information Bulletin SAIB: CE-12-15 is an FAA informational bulletin addressing a potential failure of the avionics master switch on Cessna 172R, 172S, 182T, T182T, 206H, and T206H airplanes equipped with Garmin G1000 avionics. The bulletin highlights a risk of accelerated switch failure that could lead to loss of avionics equipment, though essential flight and landing systems remain powered through alternate electrical sources.
What changed
This bulletin introduces awareness of an electrical contact erosion issue within the avionics master switch (part number S3443-1-1) caused by power-up surge currents. It recommends periodic replacement of the switch every 500 hours of operation and outlines inspection procedures if power-up issues occur. The bulletin does not mandate regulatory action but provides guidance to mitigate the risk.
Why it matters
This information is critical for operators and maintenance personnel to prevent unexpected avionics failures that could affect flight safety. Understanding the failure mode and following recommended maintenance helps ensure continued safe operation of affected Cessna models with Garmin G1000 systems. Compliance teams benefit from knowing this is an advisory, not a mandatory airworthiness directive.
More for Cessna 172R
All 5- EASA SIB CE-12-02R1Cessna 172R/172S- Alternative Methods of Compliance (AMOC) for FAA AD 2001-06-17Nov 14, 2014
- EASA SIB CE-12-03Cessna Model 172R and 172S Fuel Control; Engine Performance with the Throttle Control at IdleNov 2, 2011
- EASA SIB CE-11-37Piper PA-44-180 & Cessna 172R and S Aeroplanes - Engine Oil Filter InterferenceJun 6, 2011
- EASA SIB CE-09-12Garmin G1000, G900X and G950 units - CRS/BARO Knob InterferenceFeb 17, 2009
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