Fri, May 28, 2021
AD 2021-10-13 Prompted By A Report Indicating That Several Failure Modes Of The NWS System May Cause Loss Of Feedback
The FAA is superseding Airworthiness Directive (AD) 2015-17-08, which applied to certain Bombardier, Inc. Model DHC-8-400 series airplanes.
AD 2015-17-08 required installing new cable assemblies with a pull-down resistor. This AD requires modifications to the nose wheel steering (NWS) system. This AD was prompted by a report indicating that several failure modes of the NWS system may cause the loss of feedback from both rotary variable differential transformers to the steering control unit. The FAA is issuing this AD to address the unsafe condition on these products. This AD is effective July 1, 2021.
Supplementary Information: Transport Canada Civil Aviation (TCCA), which is the aviation authority for Canada, has issued TCCA AD CF-2020-28, dated August 14, 2020 (also referred to as the Mandatory Continuing Airworthiness Information, or the MCAI), to correct an unsafe condition for certain De Havilland Aircraft of Canada Limited Model DHC-8-401 and -402 airplanes. You may examine the MCAI in the AD docket on the internet at www.regulations.gov by searching for and locating Docket No. FAA-2021-0018.
The FAA issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 to supersede AD 2015-17-08, Amendment 39-18241 (80 FR 51459, August 25, 2015) (AD 2015-17-08). AD 2015-17-08 applied to certain Bombardier, Inc. Model DHC-8-400 series airplanes. The NPRM published in the Federal Register on February 24, 2021 (86 FR 11175). The NPRM was prompted by a report indicating that several failure modes of the NWS system may cause the loss of feedback from both rotary variable differential transformers to the steering control unit. The NPRM proposed to require modifications to the NWS system. The FAA is issuing this AD to address failure modes of the NWS system, which could lead to NWS runaway, loss of directional control of the airplane, and possible consequent runway excursion. See the MCAI for additional background information.
More News
Aero Linx: The American Society of Aerospace Medicine Specialists (ASAMS) The Society is a non-profit organization created to serve as a voice for and represent the professional ne>[...]
Class C Service This service provides, in addition to basic radar service, approved separation between IFR and VFR aircraft, and sequencing of VFR aircraft, and sequencing of VFR a>[...]
Have A Story That NEEDS To Be Featured On Aero-News? Here’s How To Submit A Story To Our Team Some of the greatest new stories ANN has ever covered have been submitted by our>[...]
Also: ERAU Uses UAVs, P550 Group 2 UAS, Starship’s Florida Launches, NASA Missions Chopped The Air Force has put out a call to commission a one-to-one copy of the Iranian-des>[...]
Classic Klyde Morris From 11.07.16 (and Remembering Bob...) FMI: www.klydemorris.com>[...]
ANN's Daily Aero-Linx (08.27.25)
See All