# AD 93-21-04: Brake Lubrication - Type: Airworthiness directive - Status: Historical - Products: Bombardier CL-600-2B19 (Regional Jet Series 100) - Effective: February 4, 1994 - Superseded by: [AD 2003-11-20](https://openairdocs.org/ad/2003-11-20) - Product type: Aircraft, Large airplane - Amendment: 39-8801 - Docket: 93-NM-177-AD - Registered aircraft: 417 may be affected, by airframe or engine model (OpenAirDocs) - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/EAB58C34FC6FFFCD86256A1D005E6DA4.0001 - DRS record last changed: August 7, 2025 - Page: https://openairdocs.org/ad/93-21-04 ## The airworthiness directive 93-21-04 CANADAIR: Amendment 39-8801. Docket No. 93-NM-177-AD. Applicability: Model CL-600-2B19 "Regional Jet" series airplanes; serial numbers 7003 and subsequent; certificated in any category. Compliance: Required as indicated, unless accomplished previously. To prevent temporary loss of all braking action, accomplish the following: (a) Within 3 days after the effective date of this AD, and thereafter at intervals not to exceed 3 days, lubricate with grease the sliding shaft of the input plunger of the brake control valve assembly in accordance with Canadair Regional Jet Alert Service Bulletin S.B.A601R- 32-016, dated October 14, 1993. (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, New York Aircraft Certification Office (ACO), FAA, Engine and Propeller Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, New York ACO. NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the New York 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 lubrication procedure shall be done in accordance with Canadair Regional Jet Alert Service Bulletin S.B.A601R-32-016, dated October 14, 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 Bombardier, Inc., Bombardier Regional Aircraft Division, Garratt Boulevard, Downsview, Ontario M3K 1Y5, Canada. This information may be examined at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the FAA, Engine and Propeller Directorate, New York Aircraft Certification Office, 181 South Franklin Avenue, Room 202, Valley Stream, New York; or at the Office of the Federal Register, 800 North Capitol Street, NW., suite 700, Washington, DC. (e) This amendment becomes effective on February 4, 1994, to all persons except those persons to whom it was made immediately effective by priority letter AD 93-21-04, issued October 18, 1993, which contained the requirements of this amendment. ## Affected data sheets (1) (OpenAirDocs) The type certificate data sheets whose models the AD names. - [TCDS A21EA-1](https://openairdocs.org/tcds/A21EA-1): MHI RJ Aviation ULC; names 1 of 9 models: CL-600-2B19 (Regional Jet Series 100) ## 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: 417 (417 by airframe model, 0 by engine model) - Makers: Bombardier 395, Canadair 19, Bombardier Inc Canadair 2, Mhi RJ Aviation ULC 1 Models with the most aircraft: - [Bombardier CL-600-2B19](https://openairdocs.org/model/bombardier-cl-600-2b19): 395 aircraft (airframe model) - [Canadair CL-600-2B19](https://openairdocs.org/model/canadair-cl-600-2b19): 19 aircraft (airframe model) - [Bombardier Inc Canadair CL-600-2B19](https://openairdocs.org/model/bombardier-inc-canadair-cl-600-2b19): 2 aircraft (airframe model) - [Mhi RJ Aviation ULC CL-600-2B19](https://openairdocs.org/model/mhi-rj-aviation-ulc-cl-600-2b19): 1 aircraft (airframe model) All 4 models: https://openairdocs.org/ad/93-21-04/models.md Every aircraft: https://openairdocs.org/ad/93-21-04/aircraft.md ## Related documents - [AD 2003-11-20](https://openairdocs.org/ad/2003-11-20): Brake control valve assembly ยท Bombardier CL-600-2B19 (Regional Jet Series 100) and CL-600-2B19 (Regional Jet Series 440). Effective Jul 11, 2003. Supersedes this AD 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.