AD 98-06-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus Helicopters | AS355E | Airworthiness Directives; Eurocopter France Model AS-350B, BA, B1, B2, and D Helicopters, and Model AS 355E, F, F1, F2, and N Helicopters |
| aircraft | Airbus Helicopters | AS355F | Airworthiness Directives; Eurocopter France Model AS-350B, BA, B1, B2, and D Helicopters, and Model AS 355E, F, F1, F2, and N Helicopters |
| aircraft | Airbus Helicopters | AS355F1 | Airworthiness Directives; Eurocopter France Model AS-350B, BA, B1, B2, and D Helicopters, and Model AS 355E, F, F1, F2, and N Helicopters |
| aircraft | Airbus Helicopters | AS355F2 | Airworthiness Directives; Eurocopter France Model AS-350B, BA, B1, B2, and D Helicopters, and Model AS 355E, F, F1, F2, and N Helicopters |
| aircraft | Airbus Helicopters | AS355N | Airworthiness Directives; Eurocopter France Model AS-350B, BA, B1, B2, and D Helicopters, and Model AS 355E, F, F1, F2, and N Helicopters |
| aircraft | Airbus Helicopters | AS350B | Airworthiness Directives; Eurocopter France Model AS-350B, BA, B1, B2, and D Helicopters, and Model AS 355E, F, F1, F2, and N Helicopters |
| aircraft | Airbus Helicopters | AS350B1 | Airworthiness Directives; Eurocopter France Model AS-350B, BA, B1, B2, and D Helicopters, and Model AS 355E, F, F1, F2, and N Helicopters |
| aircraft | Airbus Helicopters | AS350B2 | Airworthiness Directives; Eurocopter France Model AS-350B, BA, B1, B2, and D Helicopters, and Model AS 355E, F, F1, F2, and N Helicopters |
| aircraft | Airbus Helicopters | AS350BA | Airworthiness Directives; Eurocopter France Model AS-350B, BA, B1, B2, and D Helicopters, and Model AS 355E, F, F1, F2, and N Helicopters |
| aircraft | Airbus Helicopters | AS350D | Airworthiness Directives; Eurocopter France Model AS-350B, BA, B1, B2, and D Helicopters, and Model AS 355E, F, F1, F2, and N Helicopters |
Unsafe Condition
Tailboom attachment bolts marked with the letter 'M' above the designation 'BC' do not meet metallurgical design requirements, leading to potential separation of the tailboom and subsequent loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the markings on each of the 23 tailboom attachment bolts above the baggage compartment floor. Remove and replace any bolts marked with 'M' above 'BC' with airworthy bolts marked with a different letter, torqued between 67 and 79 inch-lbs using new nuts.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within 10 hours time-in-service
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Eurocopter France Model AS-350B, BA, B1, B2, and D helicopters, and Model AS 355E, F, F1, F2, and N helicopters, certificated in any category. Applies to helicopters delivered/overhauled before May 16, 1997, or with bolts replaced after July 1, 1994.
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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