AD 99-21-27
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier Inc. | DHC-8-311 | Airworthiness Directives; Bombardier Model DHC-8-311 and -315 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-315 | Airworthiness Directives; Bombardier Model DHC-8-311 and -315 Series Airplanes |
Unsafe Condition
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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Required Actions
Replace the existing nitrogen cylinder assembly on the ditching dams with a new assembly incorporating an improved valve assembly per Service Bulletin S.B. 8-25-122. Do not install nitrogen cylinder assemblies with part numbers 410870(BSC) or 410870-1.
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Compliance Time
Within 6 months after the effective date of this AD for airplanes not covered in paragraph (a). For those in paragraph (a), within 6 months after July 8, 1998.
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Affected Aircraft
Bombardier Model DHC-8-311 and -315 series airplanes in medium and high gross weight configuration with specific Bombardier Change Requests incorporated.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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