The U.S. aircraft register, updated daily
FAA orders · airworthiness directive · current

81-13-51: Wheel Brake Assembly

FAA order 81-13-51 is an airworthiness directive in force since December 7, 1981. The FAA's subject line: Wheel Brake Assembly. It names Bombardier CL-600 Challenger and CRJ: about 1,655 aircraft on the U.S. register today, though an order usually covers particular versions or serial numbers rather than every one. System: landing gear.

What it applies to as the FAA lists it

Kind of product
Aircraft
Makes
Bombardier Inc.
Models
CL-600-1A11 (CL-600), CL-600-2A12 (CL-601), CL-600-2B16 (CL-601-3A), CL-600-2B16 (CL-601-3R), CL-600-2B16 (CL-604), CL-600-2B19 (Regional Jet Series 100)
On this site
Bombardier CL-600 Challenger and CRJ 1,655 registered

Dates and paperwork

In force since
December 7, 1981
Docket
Unknown
Status
Current
The FAA's document
Read the order on the FAA's site

The order itself the regulatory text, as published

Show the full text (1,389 characters)
81-13-51 CANADAIR: Amendment 39-4268. Applies to all Canadair CL-600 series airplanes certified in all categories. To detect dragging wheel brakes, unless already accomplished, accomplish the following prior to further flight. A. Inspect and replace, if necessary, wheel brake assembly P/N 600-85083-55 with wheel brake assembly P/N 600-85083-57 in accordance with Canadair Alert Service Bulletin A600-0045, Revision 1, dated June 15, 1981. B. Airplanes may be flown to a maintenance base for repairs or replacement in accordance with FAR 21.197. C. Alternate means of compliance or other actions which provide an equivalent level of safety may be used when approved by the Chief, Seattle Area Aircraft Certification Office, FAA Northwest Mountain Region. The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received these documents from the manufacturer may obtain copies upon request to the addresses listed above. These documents may also be examined at FAA Northwest Mountain Region, 9010 East Marginal Way South, Seattle, Washington 98108. This amendment becomes effective December 7, 1981 and was effective earlier to those recipients of Telegraphic AD T81-13-51 dated June 19, 1981.

Related safety bulletins advice on the same designs, not orders

2021-09-16AIR-21-15R1 · Navigation System
2021-08-26AIR-21-15 · Navigation System
2020-03-18NM-20-03 · Landing Gear: Brake Control Valve
2019-02-19NE-19-03 · Escape Slide Maintenance Tasks and Intervals - JASC 2565
2011-08-30NM-11-51 · Ice and Rain Protection: Wing Anti-Ice System

Source: FAA Dynamic Regulatory System, airworthiness directives. The FAA's document is the authority; the register counts are this site's, from the FAA register of November 6, 2026. Connections as data: /graph/directive/81-13-51.json · aircraft systems.