AD 2000-02-30
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Twin Commander Aircraft LLC | 680 | Airworthiness Directives; Twin Commander Aircraft Corporation 600 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 680-E | Airworthiness Directives; Twin Commander Aircraft Corporation 600 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 680-F | Airworthiness Directives; Twin Commander Aircraft Corporation 600 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 680-FL | Airworthiness Directives; Twin Commander Aircraft Corporation 600 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 680-FL(P) | Airworthiness Directives; Twin Commander Aircraft Corporation 600 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 680-T | Airworthiness Directives; Twin Commander Aircraft Corporation 600 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 680-V | Airworthiness Directives; Twin Commander Aircraft Corporation 600 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 680-W | Airworthiness Directives; Twin Commander Aircraft Corporation 600 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 681 | Airworthiness Directives; Twin Commander Aircraft Corporation 600 Series Airplanes |
| aircraft | Twin Commander Aircraft LLC | 685 | Airworthiness Directives; Twin Commander Aircraft Corporation 600 Series Airplanes |
Unsafe Condition
The information necessary to activate the pneumatic wing and tail deicing boots at the first signs of ice accumulation is critical for flight in icing conditions. If not addressed, flight crews could experience reduced controllability due to adverse aerodynamic effects of ice adhering to the airplane prior to the first deicing cycle.
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Required Actions
Revise the Airplane Flight Manual (AFM) Limitations Section to include requirements for activating the pneumatic deicing boots at the first sign of ice formation or ice detector annunciation. The system must be operated in automatic cycling mode or manually cycled as needed. Compliance must be documented in aircraft records.
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Compliance Time
Within 10 calendar days after the effective date (March 24, 2000)
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Affected Aircraft
Twin Commander Aircraft Corporation 600 series models (680, 680-E, etc.) with pneumatic deicing boots, all serial numbers, certificated in any category.
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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