Commonwealth legislation

AD/CESSNA 150/44 - Instrument Panel Light Dimming Rheostat

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What it does: Requires owners/operators of specified Cessna 150/F150 and 152/F152 aeroplanes (listed by serial number) to replace the instrument‑panel light dimming rheostat with an improved, current‑limiting, heat‑protected unit per Cessna Service Bulletin SEB92‑33 Rev 2.

Who pays and why it matters: The aircraft owner/operator must arrange and pay for the replacement (and any required doubler) before 3 October 1994 (Requirement; Compliance). The change aims to reduce the risk of an inflight fire caused by a defective rheostat (Background).

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AD/CESSNA 150/44 - 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 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.

Source text

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

1 AD/CESSNA 150/44 - Instrument Panel Light Dimming Rheostat