AD 83-08-04 R3
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus Helicopters | AS355E | Airworthiness Directives; SOCIETE NATIONALE INDUSTRIELLE AEROSPATIALE (SNIAS) Model AS355 Series Helicopters |
| aircraft | Airbus Helicopters | AS355F | Airworthiness Directives; SOCIETE NATIONALE INDUSTRIELLE AEROSPATIALE (SNIAS) Model AS355 Series Helicopters |
Unsafe Condition
Loss of drive to the main rotor due to failure of epicyclic planet pinion cages with part numbers 350A32-3147-20 (over 150 hours time in service) or 350A32-1081-20/-21 (over 350 hours time in service).
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace epicyclic planet pinion cages P/N 350A32-3147-20 with 150+ hours time in service within 10 hours time in service after AD effective date. Replace cages P/N 350A32-1081-20/-21 with 350+ hours time in service within 10 hours time in service after receipt. Replace cages with less than threshold hours before reaching 160 or 360 total hours respectively.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 10 hours time in service after the effective date of this AD (for P/N 350A32-3147-20) and within 10 hours time in service after receipt (for P/N 350A32-1081-20/-21).
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Societe Nationale Industrielle Aerospatiale Model AS355 series helicopters equipped with epicyclic planet pinion cages P/N 350A32-3147-20 or 350A32-1081-20/-21.
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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