Priority Letter: Bell Helicopter Textron Model 204B, 205A, and 205A-1 Helicopters
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Priority Letter: Bell Helicopter Textron Model 204B, 205A, and 205A-1 Helicopters

Filetype[PDF-108.36 KB]

  • English

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    • NTL Classification:
      NTL-AVIATION-AVIATION;NTL-AVIATION-Aviation Safety/Airworthiness;
    • Abstract:
      This priority letter Airworthiness Directive (AD) is prompted by an accident involving the inflight failure of the tailboom vertical fin spar (vertical fin spar) on a Model 205A-1 helicopter. Two other accidents on restricted category (military surplus) aircraft of similar type design have occurred. One of the accidents resulted in a fatality. In 1971 the FAA issued AD 71-21-02 which addressed this problem by requiring a terminating action of adding a steel doubler to the inside edge of the vertical fin spar. There have been several additional failures since that AD was issued. A large number of high-power events can cause fatigue cracks which will cause the vertical fin spar to fail. This condition, if not corrected, could result in in-flight failure of the vertical fin spar and subsequent loss of control of the helicopter.
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