AD 2008-16-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | DHC-8-400 | Airworthiness Directives; Bombardier Model DHC-8-400, -401 and -402 Airplanes |
| aircraft | Aviat | Various | Airworthiness Directives; Bombardier Model DHC-8-400, -401 and -402 Airplanes |
Unsafe Condition
The tangs on the elevator centering torsion spring had been bent during installation, degrading its durability and leading to premature failure. This could result in a significant reduction in aircraft pitch control if combined with a control rod disconnect.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace all elevator centering torsion springs with new ones by incorporating Modsum 4-113482, in accordance with Bombardier Service Bulletin 84-27-31.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 5,000 flight hours after the effective date of this AD, or prior to the accumulation of 22,000 total flight hours, whichever comes later.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Bombardier Model DHC-8-400, -401, and -402 airplanes, certificated in any category, with serial numbers 4001, 4003, 4004, and 4006 through 4081.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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