AD 81-09-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus Helicopters | AS350B | Airworthiness Directives; SOCIETE NATIONALE INDUSTRIELLE AEROSPATIALE Model AS350 Series Helicopters |
| aircraft | Airbus Helicopters | AS350C | Airworthiness Directives; SOCIETE NATIONALE INDUSTRIELLE AEROSPATIALE Model AS350 Series Helicopters |
| aircraft | Airbus Helicopters | AS350D | Airworthiness Directives; SOCIETE NATIONALE INDUSTRIELLE AEROSPATIALE Model AS350 Series Helicopters |
| aircraft | Airbus Helicopters | AS350D1 | Airworthiness Directives; SOCIETE NATIONALE INDUSTRIELLE AEROSPATIALE Model AS350 Series Helicopters |
Unsafe Condition
Wear on the bevel gear module's vertical shaft splines exceeding 1.0 mm (0.039 inch) depth or distance between two 6.35 mm rods exceeding 72.2 mm (2.84 inches) could cause loss of mechanical drive between the bevel gear module and the epicyclic module of the main transmission gearbox.
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Required Actions
Inspect the bevel gear module for wear using specified procedures in Aerospatiale TELEX Service No. 05.05 or 05.06, or FAA-approved equivalent. Replace the module with a serviceable one before further flight if wear limits are exceeded.
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Compliance Time
Within 20 hours time in service after the effective date (July 23, 1981) for modules with 580+ hours since new/overhaul, or prior to 600 hours' time in service for those with less than 580 hours, and thereafter every 300 hours' time in service.
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Affected Aircraft
SOCIETE NATIONALE INDUSTRIELLE AEROSPATIALE Model AS350B, AS350C, AS350D, AS350D1 helicopters with Bevel Gear Module P/N 350A32.0300.00 or -.01 installed, excluding modules with nitrided shaft P/N 350A32.3107.23 or -.24.
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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