AD 98-07-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Agusta S.p.A. | AB412 | Airworthiness Directives; Agusta S.p.A. Model AB 412 Helicopters |
| aircraft | Agusta S.p.A. | AB412 EP | Airworthiness Directives; Agusta S.p.A. Model AB 412 Helicopters |
Unsafe Condition
Debond voids between the tip cap and blade spar/skin of tail rotor blades, part number 212-010-750-105, serial number A5-(all numbers), can result in loss of the tip cap closure block, leading to a severely out-of-balance tail rotor assembly, increased vibration levels, damage to the tail rotor drive system or assembly, and subsequent loss of control.
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Required Actions
Inspect tail rotor blades for debond voids in accordance with Agusta Bollettino Tecnico No. 412-66. Repair or replace blades with debond voids within specified limits; replace blades with voids exceeding limits. Alternative methods may be approved by the FAA Manager, Rotorcraft Standards Staff.
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Compliance Time
within 10 hours time-in-service, unless accomplished previously
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Affected Aircraft
Agusta Model AB412 helicopters with tail rotor blades, part number 212-010-750-105, serial number A5-(all numbers), certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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