# AD 93-05-15: Thrust Reverser Throttle Load Limiter - Type: Airworthiness directive - Status: Current - Products: Cessna 500, 501, 550, 551, 560, 650 and S550 - Effective: April 23, 1993 - Superseded by: Nothing supersedes this AD - Product type: Aircraft, Small/large airplane - Amendment: 39-8519 - Docket: 92-NM-155-AD - Registered aircraft: 1,677 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/28A3380D398D3EFE86256A1F006617AC.0001 - DRS record last changed: May 30, 2024 - Page: https://openairdocs.org/ad/93-05-15 ## The airworthiness directive 93-05-15 CESSNA AIRCRAFT COMPANY: Amendment 39-8519. Docket 92-NM-155-AD. Applicability: Citation Model 500/501 series airplanes, unit numbers -0001 through -0689, inclusive, equipped with thrust reversers; Citation Model 550/551 series airplanes, unit numbers -0002 through -0678, inclusive, equipped with thrust reversers; Citation Model S550 series airplanes, unit numbers -0001 through -0160, inclusive; Citation Model 560 series airplanes, unit numbers -071A, -092A, -109A, and -0001 through -0118, inclusive; Citation Model 650 series airplanes, serial numbers -0001 through -0217, inclusive; certificated in any category. Compliance: Required as indicated, unless accomplished previously. To prevent severely reduced controllability of engine power authority, accomplish the following: (a) Within 150 hours time-in-service after the effective date of this AD, modify the thrust reverser throttle load limiter in accordance with Cessna Citation Service Bulletin SB500-78-11, dated September 13, 1991 (for Model 500/501 series airplanes); Cessna Citation Service Bulletin SB550-78-03, dated September 13, 1991 (for Model 550/551 series airplanes); Cessna Citation Service Bulletin SBS550-78-04, dated September 13, 1991 (for Model S550 series airplanes); Cessna Citation Service Bulletin SB560-78-02, dated September 13, 1991 (for Model 560 series airplanes); or Cessna Citation Service Bulletin SB650-78-05, Revision 1, dated June 12, 1992 (for Model 650 series airplanes); as applicable. (b) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Wichita Aircraft Certification Office (ACO), FAA, Small Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Wichita ACO. NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Wichita ACO. (c) 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. (d) The modification shall be done in accordance with the following Cessna Citation Service Bulletins, as applicable, which contain the specified effective pages: Service Bulletin Referenced and Date Page Number Revision Level Shown on Page Shown on Page 500-78-11, September 13, 1991 1-7 Original September 13, 1991 SBS550-78-04, September 13, 1991 1-7 Original September 13, 1991 SB550-78-03, September 13, 1991 1-7 Original September 13, 1991 SB560-78-02, September 13, 1991 1-7 Original September 13, 1991 SB650-78-05, Revision 1, June 12, 1992 1-3 4-6 1 Original June 12, 1992 February 14, 1992 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, Citation Marketing Division, P.O. Box 7706, Wichita, Kansas 67277. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the FAA, Wichita Aircraft Certification Office, 1801 Airport Road, Room 100, Mid-Continent Airport, Wichita, Kansas; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (e) This amendment becomes effective on April 23, 1993. ## Affected data sheets (3) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A22CE](https://openairdocs.org/tcds/A22CE): Textron Aviation Inc.; names 4 of 6 models: S550, 550, 500, 560 - [TCDS A27CE](https://openairdocs.org/tcds/A27CE): Textron Aviation Inc.; names 2 of 2 models: 551, 501 - [TCDS A9NM](https://openairdocs.org/tcds/A9NM): Textron Aviation Inc.; names 1 of 1 models: 650 ## 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: 1,677 (1,677 by airframe model, 0 by engine model) - Makers: Cessna 1,676, Textron 1 Models with the most aircraft: - [Cessna 560](https://openairdocs.org/model/cessna-560): 596 aircraft (airframe model) - [Cessna 550](https://openairdocs.org/model/cessna-550): 500 aircraft (airframe model) - [Cessna 650](https://openairdocs.org/model/cessna-650): 201 aircraft (airframe model) - [Cessna 501](https://openairdocs.org/model/cessna-501): 189 aircraft (airframe model) - [Cessna S550](https://openairdocs.org/model/cessna-s550): 94 aircraft (airframe model) - [Cessna 500](https://openairdocs.org/model/cessna-500): 62 aircraft (airframe model) - [Cessna 551](https://openairdocs.org/model/cessna-551): 34 aircraft (airframe model) - [Textron 560](https://openairdocs.org/model/textron-560): 1 aircraft (airframe model) All 9 models: https://openairdocs.org/ad/93-05-15/models.md Every aircraft: https://openairdocs.org/ad/93-05-15/aircraft.md Its text cites no advisory circulars or STCs. --- 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.