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Airworthiness Directive

AD 99-19-18 64 FR 63653 Active

Federal Aviation Administration · 14 CFR part 39

FR document
99-30143
Amendment
39-11307
Published
1999-11-22
Effective
1999-12-27
Models covered
2
Last live check
2026-10-01

Printed from https://aircraftdirectives.com/ad/99-19-18 · AircraftDirectives restates official FAA and manufacturer records; the official sources named on this sheet control. Not an airworthiness determination.

This page is a reference Record, not an airworthiness or compliance determination. Official FAA and manufacturer sources control over our restatement, subject to governing law. Check applicability, current requirements and incorporated documents before acting. The owner or operator remains responsible for airworthiness and required records under 14 CFR 91.403 and 91.417, as applicable. Terms of Use: /terms.

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AD

99-19-18

FR doc 99-30143 · 64 FR 63653

AD 99-19-18Published 1999-11-22Effective 1999-12-27

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 revising the Airplane Flight Manual (AFM) to include requirements for activation of the airframe pneumatic deicing boots.

Full official abstract

This amendment adopts a new airworthiness directive (AD), applicable to certain Bombardier Model DHC-7 and DHC-8 series airplanes, that requires revising the Airplane Flight Manual (AFM) to include requirements for activation of the airframe pneumatic deicing boots. This amendment is prompted by reports of inflight incidents and an accident that occurred in icing conditions where the airframe pneumatic deicing boots were not activated. The actions specified by this AD are intended to ensure that flightcrews activate the pneumatic wing and tail deicing boots at the first signs of ice accumulation. This action will prevent reduced controllability of the aircraft due to adverse aerodynamic effects of ice adhering to the airplane prior to the first deicing cycle.

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All de Havilland DHC-7 Dash 7 directives

View on Federal Register (opens in a new tab) View this AD in FAA DRS (opens in a new tab)

Applies to 2 models in our index