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Airworthiness Directive

AD 98-12-22 63 FR 31609 Active

Federal Aviation Administration · 14 CFR part 39

Requires shimming the tail rotor drive system bearing supports (bearing supports).

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FR document
98-15264
Amendment
39-10576
Published
1998-06-10
Effective
1998-07-15
Models covered
1

Last live check: 2026-10-04

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AD

98-12-22

FR doc 98-15264 · 63 FR 31609

AD 98-12-22Published 1998-06-10Effective 1998-07-15

FAA rule - 14 CFR 39

FAA rule. Compliance with an applicable AD is required under 14 CFR 39.7. Check its effective date, applicability, compliance times and current status.

Requires shimming the tail rotor drive system bearing supports (bearing supports).

Full official abstract

This amendment adopts a new airworthiness directive (AD), applicable to Bell Helicopter Textron Canada (BHTC) Model 407 helicopters that requires shimming the tail rotor drive system bearing supports (bearing supports). This amendment is prompted by reports of cracked bearing hangar support arms in the area of the fillet radius. The actions specified by this AD are intended to prevent failure of the bearing supports, which could result in excessive tail rotor drive system vibration, loss of tail rotor drive, and subsequent loss of control of the helicopter.

More directives for Bell 407

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  2. AD 2026-10-04 Airworthiness Directives; Bell Textron Canada Limited Helicopters Effective 2026-06-25
  3. AD 2025-13-01 Airworthiness Directives; Bell Textron Canada Limited Helicopters Effective 2025-07-08
  4. AD 2024-10-12 Airworthiness Directives; Bell Textron Canada Limited Helicopters Effective 2024-08-22
  5. AD 2023-17-51 Airworthiness Directives; Bell Textron Canada Limited Helicopters Effective 2023-09-21

All Bell 407 directives

View on Federal Register (opens in a new tab) View this AD in FAA DRS (opens in a new tab) Print AD packet (opens the full Federal Register document in a new tab)

Applies to 1 model in our index