AD 2019-12-15
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Leonardo | S.p.A. | Airworthiness Directives; Leonardo S.p.A. Helicopters |
Unsafe Condition
an MLG shock absorber screw that does not meet specifications, which could result in failure of the MLG shock absorber, collapse or retraction of the MLG, and subsequent damage to the helicopter.
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Required Actions
replace each screw P/N NAS1351-5H12P installed on an MLG shock absorber with a screw P/N 1652A0001-01, and re-identify the MLG assembly using black permanent ink by marking an 'R' at the end of the S/N of the MLG assembly and cover with a transparent coating.
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Compliance Time
within 100 hours time-in-service (TIS) for MLG assemblies with 26,800 or more landings, within 300 hours TIS or before the MLG assembly accumulates 27,200 landings for MLG assemblies with between 22,000 and 26,799 landings, and within 1,200 hours TIS or before the MLG assembly accumulates 23,200 landings for MLG assemblies with less than 22,000 landings.
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Affected Aircraft
Leonardo S.p.A. Model AB139 and AW139 helicopters, certificated in any category, with an Increased Gross Weight 6,800 Kg kit part number (P/N) 4G0000F00111, and with a main landing gear (MLG) assembly with a P/N and serial number (S/N) listed in Figure 1 to paragraphs (a) and (e)(2) of this AD installed.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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