AD 93-25-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier Inc. | DHC-8-101 | Airworthiness Directives; De Havilland Models DHC-8-100 and DHC-8-300 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-102 | Airworthiness Directives; De Havilland Models DHC-8-100 and DHC-8-300 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-103 | Airworthiness Directives; De Havilland Models DHC-8-100 and DHC-8-300 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-106 | Airworthiness Directives; De Havilland Models DHC-8-100 and DHC-8-300 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-301 | Airworthiness Directives; De Havilland Models DHC-8-100 and DHC-8-300 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-311 | Airworthiness Directives; De Havilland Models DHC-8-100 and DHC-8-300 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-315 | Airworthiness Directives; De Havilland Models DHC-8-100 and DHC-8-300 Series Airplanes |
Unsafe Condition
Cracks in the splined couplings of flap primary-drive torque tubes could cause asymmetrical flap deployment.
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Required Actions
Inspect flap primary-drive torque tubes for specific part numbers and serial numbers listed in TABLE 1. If installed, remove through-bolts and inspect for cracks using a 10X magnifying glass. Replace cracked splined couplings or torque tubes as specified in Sundstrand Service Bulletins. Conduct recurring inspections at intervals not exceeding 300 hours time-in-service. Perform operational checks of torque sensors and install specified modifications within 2,000 hours time-in-service or 9 months.
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Compliance Time
Within 300 hours time-in-service after January 19, 1994, and recurring intervals as specified.
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Affected Aircraft
Bombardier Inc. models DHC-8-101, DHC-8-102, DHC-8-103, DHC-8-106, DHC-8-301, DHC-8-311, DHC-8-315 with serial numbers 3 through 293.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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