Commonwealth legislation

AD/CESSNA 185/44 - Instrument Panel Light Dimming Rheostat

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Requires owners/operators of Cessna 185D, 185E and 185F (serials 185-0777 through 18502310) to replace the instrument-panel light dimming rheostat with an improved, current-limiting, heat-protected unit per Cessna Service Bulletin SEB92-33 Rev 2, and fit a doubler where required. Compliance was required before 3 October 1994. The stated purpose is to reduce the risk of an inflight fire from a rheostat-related wiring short. Operators bear parts and labour costs and must follow the service bulletin's instructions by the deadline.

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AD/CESSNA 185/44 - Instrument Panel Light Dimming Rheostat

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Cessna 185 Series Aeroplanes

AD/CESSNA 185/44 Instrument Panel Light Dimming Rheostat 3/94

Applicability: Cessna Model 185D, 185E and 185F aircraft with serial numbers 185-0777 through 18502310 inclusive.

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.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

1 AD/CESSNA 185/44 - Instrument Panel Light Dimming Rheostat