Tue, Jul 28, 2009
SAIB Affects 100, 200, 300 Series Cessna Aircraft
The FAA has issued a Special
Airworthiness Information Bulletin (SAIB) to advise pilots and
owners of an airworthiness concern on mandatory replacement
intervals of Cessna Landing Light, Beacon Light, and Taxi Light
switches on Cessna 100, 200, and 300 series airplanes, specified in
Cessna service bulletins MEB09-3 and SEB09-6 dated May 11,
2009.
Cessna 100, 200, and 300 series airplanes utilize switches in
the Landing Light, Beacon Light, and Taxi Light circuits that have
been reported failing in the field causing overheating and smoke in
the cockpit. There have been reports of burned insulation on the
wiring terminals to the switch. On at
least one occasion, there was a small fire in the cockpit. The
failure in these applications can be attributed to contact erosion
leading to irregular arcing and eventual failure of the switch. The
contact erosion has been shown to occur after approximately 4,000
cycles of operation.
Cessna service bulletins SEB09-6 and MEB09-3, initial release,
dated May 11, 2009, specify the following:
- An inspection to determine time-in-service for the
switches.
- Replacement of switches that have been in service for four or
more years with the month and year of the installation written on
the new replacement switch.
- The month and year of the initial installation written on
switches that have been in service for less than four years.
The FAA recommends that owners, operators, and maintenance
technicians act on the above-referenced service bulletins within
the next 400 hours of operation, 12 months, or the next annual
inspection, whichever comes first.
File Photo
At this time, the FAA says this airworthiness concern is not
considered a condition that would warrant an AD.
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