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Airworthiness Directive

AD 2021-10-13 86 FR 28479 Active

Federal Aviation Administration · 14 CFR part 39

Requires modifications to the nose wheel steering (NWS) system.

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FR document
2021-11088
Amendment
39-21546
Published
2021-05-27
Effective
2021-07-01
Models covered
1

Last live check: 2026-10-04

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AD

2021-10-13

FR doc 2021-11088 · 86 FR 28479

AD 2021-10-13Published 2021-05-27Effective 2021-07-01

Supersedes 2015-17-08

Supersedence is read from the Federal Register text of the newer AD — the FAA publishes no structured field for it — and names only ADs held in our index.

FAA rule - 14 CFR 39

FAA rule. Compliance with an applicable AD is required under 14 CFR 39.7. Check its effective date, applicability, compliance times and current status.

Requires modifications to the nose wheel steering (NWS) system.

Full official abstract

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.

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All de Havilland DHC-8 Dash 8 directives

View on Federal Register (opens in a new tab) View this AD in FAA DRS (opens in a new tab) Print AD packet (opens the full Federal Register document in a new tab)

Applies to 1 model in our index