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Airworthiness Directive

AD 99-21-27 64 FR 56161 Active

Federal Aviation Administration · 14 CFR part 39

Requires replacement of the nitrogen cylinder assemblies that inflate the airplane's ditching dams with improved nitrogen cylinder assemblies.

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FR document
99-26866
Amendment
39-11373
Published
1999-10-18
Effective
1999-11-22
Models covered
1

Last live check: 2026-08-19

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AD

99-21-27

FR doc 99-26866 · 64 FR 56161

AD 99-21-27Published 1999-10-18Effective 1999-11-22

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 replacement of the nitrogen cylinder assemblies that inflate the airplane's ditching dams with improved nitrogen cylinder assemblies.

Supersedes an earlier directive. See the official text.

Full official abstract

This amendment supersedes an existing airworthiness directive (AD), applicable to certain Bombardier Model DHC-8-311 and -315 series airplanes, that currently requires replacement of the nitrogen cylinder assemblies that inflate the airplane's ditching dams with improved nitrogen cylinder assemblies. This amendment expands the applicability of the existing AD. This amendment is prompted by issuance of mandatory continuing airworthiness information by a foreign civil airworthiness authority. The actions specified by this AD are intended to prevent failure of the ditching dams to inflate fully during an emergency water landing, which could result in water entering the airplane.

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Applies to 1 model in our index