AD 2012-12-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Canada | Airworthiness Directives; Bell Helicopter Textron Canada, Limited, Helicopters |
| aircraft | Bell | Helicopter Textron Canada | Airworthiness Directives; Bell Helicopter Textron Canada, Limited, Helicopters |
| aircraft | Aviat | Various | Airworthiness Directives; Bell Helicopter Textron Canada, Limited, Helicopters |
Unsafe Condition
An unfiltered turbine outlet temperature (TOT) indicator over-temperature warning light, when illuminated, creates glare and reflections that could degrade the pilot's view through night vision goggles, potentially resulting in loss of control of the helicopter.
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Required Actions
Within 30 days or 50 hours time-in-service, whichever occurs first: (1) Determine the date of the STC installation. (2) If the STC installation date is on or before April 6, 2011, or is undocumented, inspect the cockpit TOT indicator unit for an unfiltered internal over-temperature warning light. If present, install an NVIS filter, part number ASU-TOTGAG-1.
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Compliance Time
Within 30 days or 50 hours time-in-service, whichever occurs first.
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Affected Aircraft
Bell Helicopter Textron Canada, Limited, Model 206, 206A, 206A-1, 206B, 206B-1, 206L, 206L-1, 206L-3, and 206L-4 helicopters, modified with Aviation Specialties Unlimited, Inc. (ASU), Night Vision Imaging System (NVIS) lighting installed per Supplemental Type Certificate SR01383SE.
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
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