AD 2017-19-27
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | Various | Airworthiness Directives; Bombardier, Inc., Airplanes |
Unsafe Condition
Cracking on spoiler power control unit (PCU) manifolds due to the heat treat process, which could lead to the loss of one hydraulic system, resulting in the loss of multiple flight controls and landing gear systems.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace affected spoiler PCUs as specified in the referenced service information.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 50 flight hours after the effective date of this AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Bombardier, Inc., Model DHC-8-401 and -402 airplanes, serial numbers 4001 and 4003 through 4527 inclusive, equipped with spoiler PCU part numbers 390700-1007 and -1009, and specific spoiler PCU serial numbers as identified in the referenced service bulletins.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.