Airworthiness directives › 2026-05-11
AD 2026-05-11 Airworthiness Directives; Airbus Helicopters
Models named: AS332C, AS332C1, AS332L, AS332L1. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Airbus Helicopters Model AS332C, AS332C1, AS332L, and AS332L1 helicopters, certificated in any category, equipped with a dual hoist installation and de-icing system.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) For helicopters without Airbus Helicopters modification 0722907 installed, within 7 days after May 20, 2020 (the effective date of AD 2020-09-15): Remove the removable parts of the dual hoist installation or remove the de-icing system in accordance with the instructions of section 3.B of Airbus Helicopters Emergency Alert Service Bulletin (EASB) AS332 01.00.91, Revision 1, dated December 4, 2019 (EASB AS332 01.00.91 Rev 1), or Section 3.B.2 of Airbus Helicopters EASB AS332 01.00.96, Revision 0, dated December 4, 2019 (EASB AS332 01.00.96), as applicable to the helicopter, except you are not required to contact Airbus Helicopters. (2) For helicopters with Airbus Helicopters modification 0722907 installed, within 110 hours time-in-service (TIS) or 30 days whichever occurs first after the effective date of this AD and thereafter, during the first flight after each time any of the maintenance tasks identified in the COMPLIANCE: MANDATORY section of Airbus Helicopters Alert Service Bulletin ASB AS332-04-00-0001, Issue 002, dated December 4, 2024 (ASB AS332-04-00-0001) is accomplished, perform a vibration level measurement in accordance with paragraphs (g)(2)(i) and (ii) of this AD. (i) With the accelerometer already installed, check the measurement of the vibration level in-flight, at 12 Hz by following figure 1 to paragraph (g)(2)(i) of this AD. The owner/operator (pilot) holding at least a private pilot certificate may perform this check and must enter compliance with these paragraphs 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. Figure 1 to Paragraph (g)(2)(i)—Method of Measurement ER13MR26.003 (ii) Interpret the results in accordance with the instructions in Section 4.4 of ASB AS332-04-00-0001 except you are not required to send any information to Airbus Helicopters. If the vibration level between 11.7 Hz and 12.7 Hz is more than 0.08g (0.40 IPS), before further flight, revise the helicopter configuration by removing the dual hoist system or removing the blade de-icing harnesses in accordance with instructions of section 4.5 through 4.5.2.1 of ASB AS332-04-00-0001.
Unsafe condition
This AD was prompted by a report of vibrations around the 12 Hz frequency due to the specific helicopter configuration and determination that additional vibration level measurements are necessary. The FAA is issuing this AD to prevent divergent aeromechanic coupling between the helicopter structure and rotor. The unsafe condition, if not addressed, could result in mechanical failure of structural parts and consequent loss of control of the helicopter.
Affected ADs
This AD replaces AD 2020-09-15, Amendment 39-19911 (85 FR 30589, May 20, 2020) (AD 2020-09-15).
Read the original on the Federal Register →
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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