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 | Special Airworthiness Information Bulletin |
 Header Information
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
SAIB Number:
CE-09-42
Issue Date:
07/24/2009
Subject:
Lights - Landing Light, Beacon Light and Taxi Light Switch Applications
Title:
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 SAIB Scope
Full Text of the SAIB
Introduction
This Special Airworthiness Information Bulletin (SAIB) is being issued to advise you 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 per Cessna service bulletins MEB09-3 and SEB09-6 dated May 11, 2009.
At this time, this airworthiness concern is not considered an unsafe condition that would warrant an airworthiness directive (AD) action under Title 14 of the Code of Federal Regulations (14 CFR part 39).
Background
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.
Recommendations
The FAA recommends that owners, operators, and maintenance technicians do the actions of the above-referenced service bulletins within the next 400 hours of operation, 12 months, or the next annual inspection, whichever comes first.
For Further Information Contact
Daniel Hilton, Aerospace Engineer, FAA Wichita ACO, 1801 Airport Road, Room 100, Wichita,
KS 67209, telephone: (316) 946-4173, fax: (316) 946-4107, e-mail: daniel.hilton@faa.gov.
(Optional) For Related Service Information Contact
Customer Service
Cessna Aircraft Company
P.O. Box 7706
Wichita, Kansas, 67277
Phone: 316-517-5800 Fax: 316-942-9006
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