AD 99-06-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus Helicopters | AS-365N2 | Airworthiness Directives; Eurocopter France Model AS-365N, N1, and N2 Helicopters |
| aircraft | Airbus Helicopters | SA-365N | Airworthiness Directives; Eurocopter France Model AS-365N, N1, and N2 Helicopters |
| aircraft | Airbus Helicopters | SA-365N1 | Airworthiness Directives; Eurocopter France Model AS-365N, N1, and N2 Helicopters |
Unsafe Condition
Disbonding of the metal center section of the main rotor head frequency adapter from the elastomer caused by a lack of adherence during the production process, leading to increased vibrations and reduced controllability of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Determine the part number, serial number, and date of manufacture of the main rotor head frequency adapter. If the adapter is part number 704A33-640-031 (E1T2624-01A) or 365A31-1858-01 (pairs) manufactured before April 1, 1991, with serial number ≤8188, or part number 704A33-640-046 (E1T3023-01) or 365A31-1858-02 (pairs) manufactured before April 1, 1991, with serial number ≤3122, replace it with an airworthy frequency adapter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 100 hours time-in-service or 6 calendar months, whichever occurs first, unless accomplished previously
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Eurocopter France Model AS-365N, N1, and N2 helicopters, certificated in any category.
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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