Airworthiness directives › 2025-13-01
AD 2025-13-01 Airworthiness Directives; Bell Textron Canada Limited Helicopters
Models named: 407, 427. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Bell Textron Canada Limited Model 407 and 427 helicopters, certificated in any category.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 30 hours time-in-service or 30 days, whichever occurs first after the effective date of this AD, remove from service each affected part and replace with a part eligible for installation.
Unsafe condition
This AD was prompted by a report that certain expandable blade bolts installed on the main rotor blade may not have received the correct heat treatment, which could lead to stress corrosion cracking of the expandable blade bolts. The FAA is issuing this AD to prevent stress corrosion cracking of the expandable blade bolts installed on the main rotor blade. The unsafe condition, if not addressed, could result in failure of the main rotor blade assembly, detachment of the main rotor blade, and consequent loss of control of the helicopter.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1