Airworthiness directives › 2026-05-51
AD 2026-05-51 Airworthiness Directives; Bell Textron Canada Limited Helicopters
Models named: 505. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Bell Textron Canada Limited Model 505 helicopters, certificated in any category, serial numbers 65011 and subsequent, with ballast box assembly part number (P/N) SLS-706-201-207 or P/N SLS-706-201-207FM installed.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Before further flight, revise the Limitations section of the existing rotorcraft flight manual (RFM) for the helicopter by inserting the following text: “the use of the ballast weights within the aft movable ballast box assembly P/N SLS-706-201-207 or SLS-706-201-207FM, is prohibited.” (1) Inserting a copy of this AD into the Limitations section of the RFM satisfies the requirements of paragraph (g) of this AD. (2) For this AD, the owner/operator (pilot) holding at least a private pilot certificate may revise the existing RFM for the helicopter and must enter compliance into the helicopter maintenance records in accordance with 14 CFR 43.9(a) and 91.417(a)(2)(v). The record must be maintained as required by 14 CFR 91.417, 121.380, or 135.439.
Unsafe condition
This AD was prompted by a failure of the hinge assembly on the aft movable ballast box assembly, which could allow the ballast weights to escape the ballast box and strike the tail rotor assembly. The FAA is issuing this AD to prevent damage to and/or departure of tail rotor blades, loss of tail rotor thrust, and severe vibrations. The unsafe condition, if not addressed, could result in loss of control of the helicopter.
Affected ADs
None.
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