# AD 93-24-15: Instrument Panel Light Rheostat - Type: Airworthiness directive - Status: Current - Products: Cessna F150F, F150G, F150H, F150J, F172E, F172F, F172G, F172H, FR172E, FR172F, FR172G, 150F and 17 more - Effective: February 11, 1994 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Small airplane - Amendment: 39-8764 - Docket: 93-CE-43-AD - Registered aircraft: 8,459 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/656D033011626F9B86256A500043120C.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/93-24-15 ## The airworthiness directive 93-24-15 CESSNA AIRCRAFT COMPANY: Amendment 39-8764. Docket No. 93-CE-43-AD. Applicability: The following model and serial number airplanes, certificated in any category: Models Serial Numbers 150F, 150G, 150H, and 150J. 15061533 through 15071128. F150F, F150G, F150H, and F150J. F150-0001 through F150-0529. 172E, 172F, 172G, 172H, 172I, and 172K (T-41A). 17250573 through 17259223. F172E, F172F, F172G, and F172H. F172-0019 through F17200754. FR172E, FR172F, and FR172G. FR17200001 through FR17200225. 180H and 180J. 18051446 through 18052384. 185D, 185E, and 185F. 185-0777 through 18502310. R172E, R172F, R172G, and R172H (T-41B, T-41C, and T-41D). R172-0001 through R172-0452. Compliance: Required within the next 6 calendar months after the effective date of this AD, unless already accomplished. To prevent an in-flight fire caused by a short in the electrical wiring controlled by the instrument panel light dimming rheostat,accomplish the following: (a) Replace the existing instrument panel light dimming rheostat with one of improved design that is current-limited and heat-protected, part number RD-0015H-1600, in accordance with Cessna ACCOMPLISHMENT INSTRUCTIONS SEB92-33R1, Revision 1, dated June 25, 1993. (b) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished. (c) An alternative method of compliance or adjustment of the compliance time that provides an equivalent level of safety may be approved by the Manager, Wichita Aircraft Certification Office, 1801 Airport Road, Room 100, Mid-Continent Airport, Wichita, Kansas 67209. The request shall be forwarded through an appropriate FAA Maintenance Inspector, who may add comments and then send it to the Manager, Wichita Aircraft Certification Office. NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Wichita Aircraft Certification Office. (d) The replacement required by this AD shall be done in accordance with Cessna ACCOMPLISHMENT INSTRUCTIONS SEB92-33R1, Revision 1, dated June 25, 1993. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies may be obtained from Cessna Aircraft Company, P.O. Box 7704, Wichita, Kansas 67277. Copies may be inspected at the FAA, Central Region, Office of the Assistant Chief Counsel, Room 1558, 601 E. 12th Street, Kansas City, Missouri, or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (e) This amendment becomes effective on February 11, 1994. ## Affected data sheets (8) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS 3A12](https://openairdocs.org/tcds/3A12): Textron Aviation Inc.; names 6 of 18 models: 172F (USAF T-41A), 172K, 172G, 172H (USAF T-41A), 172E, 172I - [TCDS 3A17](https://openairdocs.org/tcds/3A17): Textron Aviation Inc.; names 4 of 12 models: R172H, R172G, R172F, R172E - [TCDS 3A19](https://openairdocs.org/tcds/3A19): Textron Aviation Inc.; names 4 of 18 models: 150G, 150J, 150H, 150F - [TCDS A13EU](https://openairdocs.org/tcds/A13EU): Textron Aviation Inc.; names 4 of 14 models: F150G, F150H, F150J, F150F - [TCDS A4EU](https://openairdocs.org/tcds/A4EU): Textron Aviation Inc.; names 4 of 11 models: F172F, F172H, F172E, F172G - [TCDS A18EU](https://openairdocs.org/tcds/A18EU): Textron Aviation Inc.; names 3 of 6 models: FR172G, FR172E, FR172F - [TCDS 3A24](https://openairdocs.org/tcds/3A24): Textron Aviation Inc.; names 2 of 8 models: 185E, 185D - [TCDS 5A6](https://openairdocs.org/tcds/5A6): Textron Aviation Inc.; names 2 of 11 models: 180J, 180H ## Registered aircraft it may apply to (OpenAirDocs) Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment. - Aircraft: 8,459 (8,459 by airframe model, 0 by engine model) - Makers: Cessna 8,454, Reims Aviation S A 5 Models with the most aircraft: - [Cessna 150F](https://openairdocs.org/model/cessna-150f): 1,063 aircraft (airframe model) - [Cessna 172K](https://openairdocs.org/model/cessna-172k): 1,026 aircraft (airframe model) - [Cessna 150G](https://openairdocs.org/model/cessna-150g): 977 aircraft (airframe model) - [Cessna 172H](https://openairdocs.org/model/cessna-172h): 780 aircraft (airframe model) - [Cessna 150H](https://openairdocs.org/model/cessna-150h): 756 aircraft (airframe model) - [Cessna 172G](https://openairdocs.org/model/cessna-172g): 722 aircraft (airframe model) - [Cessna 172F](https://openairdocs.org/model/cessna-172f): 717 aircraft (airframe model) - [Cessna 150J](https://openairdocs.org/model/cessna-150j): 659 aircraft (airframe model) - [Cessna 172E](https://openairdocs.org/model/cessna-172e): 617 aircraft (airframe model) - [Cessna 180H](https://openairdocs.org/model/cessna-180h): 366 aircraft (airframe model) - [Cessna 172I](https://openairdocs.org/model/cessna-172i): 353 aircraft (airframe model) - [Cessna 180J](https://openairdocs.org/model/cessna-180j): 266 aircraft (airframe model) - [Cessna R172E](https://openairdocs.org/model/cessna-r172e): 98 aircraft (airframe model) - [Cessna 185D](https://openairdocs.org/model/cessna-185d): 30 aircraft (airframe model) - [Cessna 185E](https://openairdocs.org/model/cessna-185e): 14 aircraft (airframe model) - [Cessna R172G](https://openairdocs.org/model/cessna-r172g): 6 aircraft (airframe model) - [Reims Aviation S A CESSNA F172H](https://openairdocs.org/model/reims-aviation-s-a-cessna-f172h): 5 aircraft (airframe model) - [Cessna F172G](https://openairdocs.org/model/cessna-f172g): 2 aircraft (airframe model) - [Cessna F172H](https://openairdocs.org/model/cessna-f172h): 1 aircraft (airframe model) - [Cessna F150H](https://openairdocs.org/model/cessna-f150h): 1 aircraft (airframe model) All 20 models: https://openairdocs.org/ad/93-24-15/models.md Every aircraft: https://openairdocs.org/ad/93-24-15/aircraft.md Its text cites no advisory circulars or STCs. ## NTSB investigations that cite this AD (1) From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. - [NTSB LAX01FA070](https://openairdocs.org/ntsb/LAX01FA070), Jan 7, 2001: Cessna 172F (N383CA), San Luis Obispo, CA, destroyed, 2 fatal. Probable cause: The pilot's failure to maintain a proper climb rate to VFR conditions on-top. --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.