AD 99-19-34
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier Inc. | DHC-8-101 | Airworthiness Directives; Bombardier Model DHC-8-100 and -300 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-102 | Airworthiness Directives; Bombardier Model DHC-8-100 and -300 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-103 | Airworthiness Directives; Bombardier Model DHC-8-100 and -300 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-106 | Airworthiness Directives; Bombardier Model DHC-8-100 and -300 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-301 | Airworthiness Directives; Bombardier Model DHC-8-100 and -300 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-311 | Airworthiness Directives; Bombardier Model DHC-8-100 and -300 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-315 | Airworthiness Directives; Bombardier Model DHC-8-100 and -300 Series Airplanes |
Unsafe Condition
Damage to certain hydraulic system components in the number 2 engine nacelle could result in loss of the number 1 and number 2 hydraulic systems, and consequent reduced controllability of the airplane.
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Required Actions
Modify certain hydraulic systems by accomplishing Bombardier Service Bulletin S.B. 8-32-128, Revision 'C', and either relocate the number 2 standby power unit per S.B. 8-29-23 or install a hydraulic rudder isolation system per S.B. 8-29-29. Compliance with alternative methods may be approved by the FAA.
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Compliance Time
Within 18 months after the effective date (October 27, 1999)
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Affected Aircraft
Bombardier Model DHC-8-100 and -300 series airplanes with serial numbers 003 through 405, excluding those with specific modifications installed.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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