AD 79-21-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus Helicopters | SA330F | Airworthiness Directives; SOCIETE NATIONALE INDUSTRIELLE AEROSPATIALE (SNIAS) Model SA 330F Helicopters |
Unsafe Condition
Tail boom cracks and excessive tail deflection could lead to structural failure of the tail boom structure or tail pylon structure, compromising helicopter integrity.
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Required Actions
Inspect tail boom structure at specified frames for cracks and loose rivets per SB 05.30/05.33. Increase inspection frequency to 25 hours if cracks are found. Replace doubler per SB 53.09/53.12 if cracks extend to end or into flange, or multiple cracks exist. Reinforce tail structure if defects exceed limits. Repair unspecified defects per Structural Repair Manual.
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Compliance Time
Within the next 50 hours time in service after the effective date and thereafter at intervals not to exceed 50 hours time in service since previous inspection. Adjusted to 25 hours if cracks/defects found as specified.
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Affected Aircraft
Societe Nationale Industrielle Aerospatiale (SNIAS) Model SA 330F Puma helicopters, certificated in all categories, excluding those with SNIAS Modification AMS 07.11.464 or SB 53.09 (for part (a)), and those with Modification 07.11.141/S256 or tail skid without reinforcement plate (for part (b)).
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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