AD Amdt-39-13585
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | Inc | Airworthiness Directives; Bombardier Inc. Model Otter DHC-3 Airplanes |
Unsafe Condition
The current Supplemental Type Certificates (STCs) for turbine engine installations on Bombardier Inc. Model Otter DHC-3 airplanes may not provide adequate redundancy in the elevator servo-tab control linkage, potentially leading to loss of control.
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Required Actions
Inspect the affected airplanes to ensure they incorporate STC No. SA3777NM (A.M. Luton installation of Pratt and Whitney PT6A-34/-135 engine). Remove reference to STCs owned by Texas Turbines Conversions, Inc., and Canada Turbine Conversions, Inc., from the AD. Revise the Airworthiness Directive to reflect these changes.
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Compliance Time
Within 30 days of the effective date of this revision.
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Affected Aircraft
Bombardier Inc. Model Otter DHC-3 airplanes with turbine engines installed per STC No. SA3777NM (A.M. Luton installation of Pratt and Whitney PT6A-34/-135 engine).
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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