# AD 93-04-02: Transponders - Type: Airworthiness directive - Status: Current - Products: BAE Systems ATP, CL-600-2A12 (CL-601), DHC-8-101, DHC-8-102, DHC-8-103, DHC-8-106, DHC-8-201, DHC-8-202, DHC-8-301, DHC-8-311, DHC-8-315, Mystere-Falcon 200 and 14 more - Effective: March 26, 1993 - Superseded by: Nothing supersedes this AD - Product type: Appliance - Amendment: 39-8504 - Docket: 93-CE-18-AD - Registered aircraft: 1,476 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/04797D81E86F80B286256A410071F0CF.0001 - DRS record last changed: January 21, 2026 - Page: https://openairdocs.org/ad/93-04-02 ## The airworthiness directive 93-04-02 ROCKWELL INTERNATIONAL/COLLINS AVIATION DIVISION: Amendment 39-8504. Docket No. 93-CE-18-AD. Applicability: TDR-94D Mode S transponders, P/N CPN 622-9210-002, installed on, but not limited to the following, certificated in any category: Aerospatiale ATR-42 and ATR-72 series airplanes Saab 340A and 340B airplanes Short Model SD3-60 airplanes de Havilland DHC-7 and DHC-8 series airplanes British Aerospace ATP airplanes Gulfstream G-II, G-III, and G-IV series airplanes Dassault Mystere-Falcon 50, Mystere-Falcon 200, and Mystere-Falcon 900 airplanes Canadair Challenger CL-601 airplanes British Aerospace HS 125-700A airplanes Beechcraft 300 series airplanes Compliance: Required as indicated, unless already accomplished. To prevent a mid-air collision or a near-miss situation caused by failure of these Mode S transponders, accomplish the following: (a) Within the next 10 calendar days after theeffective date of this AD, fabricate a placard with the following words in letters at least 0.10-inch in height and install this placard within the pilot's clear view on the instrument panel: "OPERATION OF TCAS II IN ANY MODE OTHER THAN THE "TA ONLY" MODE IS PROHIBITED." (b) Within the next 6 calendar months after the effective date of this AD, modify the software of the Mode S transponders in accordance with the Accomplishment Instructions section of Collins Service Bulletin TDR-94/94D-34-6, Revision 2, dated September 21, 1992. The placard required by paragraph (a) of this AD is no longer required after this modification is incorporated. (c) If parts for the above modification are not available, the airplane operator may comply with the placard requirement of paragraph (a) of this AD until the modification is incorporated based upon a schedule established by the manufacturer through the Atlanta Aircraft Certification Office. (d) Special flight permits may be issuedin accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished. (e) An alternative method of compliance or adjustment of the compliance times that provides an equivalent level of safety may be approved by the Manager, Atlanta Aircraft Certification Office, 1669 Phoenix Parkway, Suite 210C, Atlanta, Georgia 30349. The request shall be forwarded through an appropriate FAA Maintenance Inspector, who may add comments and then send it to the Manager, Atlanta Aircraft Certification Office. NOTE 2: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Atlanta Aircraft Certification Office. (f) The modification required by this AD shall be done in accordance with Collins Service Bulletin TDR-94/94D-34-6, Revision 2, dated September 21, 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 Rockwell International/Collins General Aviation Division, 1100 West Hibiscus Boulevard, Melbourne, Florida 32901. 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., 7th Floor, suite 700, Washington, DC. (g) This amendment becomes effective on March 26, 1993. ## Affected data sheets (10) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A13NM](https://openairdocs.org/tcds/A13NM): De Havilland Aircraft of Canada Limited; names 9 of 16 models: DHC-8-101, DHC-8-102, DHC-8-103, DHC-8-106, DHC-8-201, DHC-8-202, DHC-8-301, DHC-8-311… - [TCDS A20EA](https://openairdocs.org/tcds/A20EA): De Havilland Aircraft of Canada Limited; names 5 of 5 models: DHC-7-101, DHC-7-103, DHC-7-102, DHC-7-100, DHC-7-1 - [TCDS A46EU](https://openairdocs.org/tcds/A46EU): Dassault Aviation; names 2 of 3 models: Mystere-Falcon 900, Mystere-Falcon 50 - [TCDS A12EA](https://openairdocs.org/tcds/A12EA): Gulfstream Aerospace Corporation; names 1 of 7 models: G-IV - [TCDS A21EA](https://openairdocs.org/tcds/A21EA): Bombardier Inc.; names 1 of 5 models: CL-600-2A12 (601) - [TCDS A24CE](https://openairdocs.org/tcds/A24CE): Textron Aviation Inc.; names 1 of 37 models: 300 - [TCDS A27NM](https://openairdocs.org/tcds/A27NM): BAE Systems (Operations) Limited; names 1 of 1 models: ATP - [TCDS A3EU](https://openairdocs.org/tcds/A3EU): Textron Aviation Inc.; names 1 of 50 models: HS.125 Series 700A - [TCDS A52EU](https://openairdocs.org/tcds/A52EU): Saab AB; names 1 of 2 models: SAAB 340B - [TCDS A7EU](https://openairdocs.org/tcds/A7EU): Dassault Aviation; names 1 of 11 models: Mystere-Falcon 200 ## 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: 1,476 (1,476 by airframe model, 0 by engine model) - Makers: Cessna 543, Gulfstream Aerospace 369, Dassault 140, Beech 125, Dassault-Breguet 82, Saab-Scania 42, Dehavilland 35, Bombardier 32, Short Bros 26, Canadair 20 Models with the most aircraft: - [Cessna 340A](https://openairdocs.org/model/cessna-340a): 543 aircraft (airframe model) - [Gulfstream Aerospace G-IV](https://openairdocs.org/model/gulfstream-aerospace-g-iv): 357 aircraft (airframe model) - [Beech 300](https://openairdocs.org/model/beech-300): 125 aircraft (airframe model) - [Dassault MYSTERE-FALCON 50](https://openairdocs.org/model/dassault-mystere-falcon-50): 88 aircraft (airframe model) - [Dassault-Breguet MYSTERE FALCON 900](https://openairdocs.org/model/dassault-breguet-mystere-falcon-900): 73 aircraft (airframe model) - [Dassault MYSTERE FALCON 900](https://openairdocs.org/model/dassault-mystere-falcon-900): 52 aircraft (airframe model) - [Saab-Scania SAAB 340B](https://openairdocs.org/model/saab-scania-saab-340b): 42 aircraft (airframe model) - [Short Bros SD3-60](https://openairdocs.org/model/short-bros-sd3-60): 26 aircraft (airframe model) - [Canadair CL-600-2A12](https://openairdocs.org/model/canadair-cl-600-2a12): 19 aircraft (airframe model) - [Dehavilland DHC-8-202](https://openairdocs.org/model/dehavilland-dhc-8-202): 17 aircraft (airframe model) - [Bombardier DHC-8-315](https://openairdocs.org/model/bombardier-dhc-8-315): 15 aircraft (airframe model) - [Saab SAAB 340B](https://openairdocs.org/model/saab-saab-340b): 15 aircraft (airframe model) - [Bombardier DHC-8-202](https://openairdocs.org/model/bombardier-dhc-8-202): 14 aircraft (airframe model) - [British Aerospace HS 125-700A](https://openairdocs.org/model/british-aerospace-hs-125-700a): 14 aircraft (airframe model) - [Dassault-Breguet MYSTERE FALCON 200](https://openairdocs.org/model/dassault-breguet-mystere-falcon-200): 9 aircraft (airframe model) - [Gulfstream Aerospace G-IV (G400)](https://openairdocs.org/model/gulfstream-aerospace-g-iv-g400): 8 aircraft (airframe model) - [Saab-Fairchild 340A](https://openairdocs.org/model/saab-fairchild-340a): 8 aircraft (airframe model) - [Hawker Siddeley HS.125 SERIES 700A](https://openairdocs.org/model/hawker-siddeley-hs-125-series-700a): 7 aircraft (airframe model) - [Dehavilland DHC-7-102](https://openairdocs.org/model/dehavilland-dhc-7-102): 5 aircraft (airframe model) - [Avions Marcel Dassault MYSTERE FALCON 900](https://openairdocs.org/model/avions-marcel-dassault-mystere-falcon-900): 4 aircraft (airframe model) All 42 models: https://openairdocs.org/ad/93-04-02/models.md Every aircraft: https://openairdocs.org/ad/93-04-02/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.