Federal Register of Legislation
COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES
Cessna 150, F150, 152 & F152 Series Aeroplanes
AD/CESSNA 150/44 Instrument Panel Light Dimming Rheostat 3/94
Applicability: Cessna aircraft as follows;
Model Serial Numbers 150F, 150G, 150H and 150J 15061533 through 15071128 F150F, F150G, F150H and F150J F150-0001 through F150-0529
Requirement: Unless previously accomplished, replace the existing instrument panel light dimming rheostat (some installations will also require the fitting of a doubler) in accordance with the Accomplishment Instructions of Cessna Single Engine Service Bulletin SEB92-33 Revision 2 dated 10 September 1993.
Note: FAA AD 93-24-15 Amdt 39-8764 refers.
Compliance: Prior to 3 October 1994.
Background: The FAA has advised of a report of an inflight fire in a Cessna Model 172.
The fire was caused by a short in the electrical wiring controlled by the instrument panel light dimming rheostat. This Directive requires the rheostat to be replaced with an improved version, which is both current-limiting and heat-protected, thus decreasing the probability of an inflight fire being caused by a defective rheostat.
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