AD 93-17-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier Inc. | DHC-8-101 | Airworthiness Directives; De Havilland Models DHC-8-100 Series and DHC-8-300 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-102 | Airworthiness Directives; De Havilland Models DHC-8-100 Series and DHC-8-300 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-103 | Airworthiness Directives; De Havilland Models DHC-8-100 Series and DHC-8-300 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-106 | Airworthiness Directives; De Havilland Models DHC-8-100 Series and DHC-8-300 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-301 | Airworthiness Directives; De Havilland Models DHC-8-100 Series and DHC-8-300 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-311 | Airworthiness Directives; De Havilland Models DHC-8-100 Series and DHC-8-300 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-315 | Airworthiness Directives; De Havilland Models DHC-8-100 Series and DHC-8-300 Series Airplanes |
Unsafe Condition
Reduced strength and fail-safe capability of the structural attachment of the horizontal stabilizer to the airplane due to cracks at the radius transition between the bolt head and shank of the horizontal stabilizer midspar attachment bolts.
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Required Actions
Within 250 landings after the effective date, perform a one-time magnetic particle inspection of the horizontal stabilizer midspar attachment bolts. If any crack is found, replace both bolts with serviceable ones prior to further flight. Additionally, ensure all bolts installed after the effective date are inspected using magnetic particle techniques before installation.
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Compliance Time
Within 250 landings after the effective date of this AD
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Affected Aircraft
De Havilland Models DHC-8-100 series (serial numbers 003 through 315 inclusive, 317 through 344 inclusive, and 346 through 349 inclusive) and DHC-8-300 series (serial numbers 100 through 319 inclusive, 321 through 337 inclusive, 339, 341, and 342).
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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