AD 83-07-05 R3
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus Helicopters | AS355E | Airworthiness Directives; AEROSPATIALE HELICOPTER CORPORATION (SNIAS) Model AS-350 and AS-355 Series Helicopters |
| aircraft | Airbus Helicopters | AS355F | Airworthiness Directives; AEROSPATIALE HELICOPTER CORPORATION (SNIAS) Model AS-350 and AS-355 Series Helicopters |
| aircraft | Airbus Helicopters | AS350B | Airworthiness Directives; AEROSPATIALE HELICOPTER CORPORATION (SNIAS) Model AS-350 and AS-355 Series Helicopters |
| aircraft | Airbus Helicopters | AS350B1 | Airworthiness Directives; AEROSPATIALE HELICOPTER CORPORATION (SNIAS) Model AS-350 and AS-355 Series Helicopters |
| aircraft | Airbus Helicopters | AS350C | Airworthiness Directives; AEROSPATIALE HELICOPTER CORPORATION (SNIAS) Model AS-350 and AS-355 Series Helicopters |
| aircraft | Airbus Helicopters | AS350D | Airworthiness Directives; AEROSPATIALE HELICOPTER CORPORATION (SNIAS) Model AS-350 and AS-355 Series Helicopters |
| aircraft | Airbus Helicopters | AS350D1 | Airworthiness Directives; AEROSPATIALE HELICOPTER CORPORATION (SNIAS) Model AS-350 and AS-355 Series Helicopters |
Unsafe Condition
Failure of the main rotor mast due to surface finish deterioration, corrosion, or cracks in the upper areas above the swashplate, particularly around the 12 flange bolt holes and the flange-to-shaft radius.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the main rotor mast for surface finish deterioration, corrosion, or cracks using visual and magnified inspection, followed by magnetic particle or dye penetrant inspection where finish deterioration exposes metal. Re-work or replace corroded masts per service bulletins. Repeat inspections at intervals not exceeding 300 hours time in service. Daily pre-flight inspections are required for AS-355 and AS-350 helicopters.
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Compliance Time
Compliance is required as indicated: within 50 hours time in service for helicopters with 250+ hours on the mast by the effective date; before reaching 300 hours time in service for those with less than 250 hours; before further flight for those with severe tracking defects. AS-355 and AS-350 helicopters must comply within 10 hours time in service from the effective date for subsequent inspections.
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Affected Aircraft
AEROSPATIALE HELICOPTER CORPORATION (SNIAS) Model AS-350 and AS-355 series helicopters, including AS355E, AS355F, AS350B, AS350B1, AS350C, AS350D, AS350D1, certificated in all categories.
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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