Airworthiness directives › 2024-20-03
AD 2024-20-03 Airworthiness Directives; Robinson Helicopter Company Helicopters
Makes named: robinson. Models named: R22 Beta, R22 Mariner, R44, R44 II. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to all Robinson Helicopter Company Model R22 Beta, R22 Mariner, R44, and R44 II helicopters, certificated in any category, with a governor controller part number (P/N) D270-1, Revision A through E inclusive, installed.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Within 90 days after the effective date of this AD, remove the governor controller from service and install a governor controller P/N D270-1, Revision F or later approved revision by following the Compliance Procedure, paragraphs 2. though 5., of Robinson Helicopter Company R22 Service Bulletin SB-121 or R44 Service Bulletin SB-114, each dated June 28, 2023 (SB-121 or SB-114), as applicable to your helicopter model, except the procedures in paragraph 4. of SB-121 and SB-114 must be accomplished by persons authorized under 14 CFR 43.3. (2) As of the effective date of this AD, do not install any governor controller P/N D270-1, Revision A through E inclusive, on any helicopter.
Unsafe condition
This AD was prompted by reports of engine governor failures caused by water intrusion. The FAA is issuing this AD to prevent engine governor failures. The unsafe condition, if not addressed, could result in loss of engine speed governing such as an engine overspeed or underspeed condition, and subsequent unexpected loss of power during critical phases of flight and landing.
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