AD 2021-03-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Leonardo | S.p.a. | Airworthiness Directives; Leonardo S.p.a. Helicopters |
Unsafe Condition
A non-conforming engine mounting rod, which could result in structural failure of the engine mounting rod and subsequent loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Before further flight, determine the total hours time-in-service (TIS) of each engine mounting rod. Before reaching 225 total hours TIS or within 25 hours TIS, whichever occurs later, with the battery and any other electrical power supply disconnected, remove from service the engine mounting rod as follows: For the Number 1 engine outboard mounting rod, remove from service the Number 1 engine outboard mounting rod and install an airworthy Number 1 engine outboard mounting rod as shown in Detail ``B'' of Figure 1 of Leonardo Helicopters Alert Service Bulletin No. 139-593, Revision A, dated June 14, 2019. For the Number 2 engine outboard mounting rod, remove from service the Number 2 engine outboard mounting rod and install an airworthy Number 2 engine outboard mounting rod as shown in Detail ``C'' of Figure 1 of Leonardo Helicopters Alert Service Bulletin No. 139-593, Revision A, dated June 14, 2019. For the Number 1 engine inboard mounting rod, remove from service the Number 1 engine inboard mounting rod and install an airworthy Number 1 engine inboard mounting rod as shown in Detail ``D'' of Figure 1 of Leonardo Helicopters Alert Service Bulletin No. 139-593, Revision A, dated June 14, 2019. For the Number 2 engine inboard mounting rod, remove from service the Number 2 engine inboard mounting rod and install an airworthy Number 2 engine inboard mounting rod as shown in Detail ``E'' of Figure 1 of Leonardo Helicopters Alert Service Bulletin No. 139-593, Revision A, dated June 14, 2019.
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Compliance Time
Before further flight, or within 25 hours TIS, whichever occurs later, with the battery and any other electrical power supply disconnected.
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Affected Aircraft
Leonardo S.p.a. Model AB139 and AW139 helicopters, certificated in any category, with an engine mounting rod part number (P/N) 3G7120V00132 with a serial number (S/N) listed in Figures 2 or 3 of Leonardo Helicopters Alert Service Bulletin No. 139-593, Revision A, dated June 14, 2019 (ASB 139-593), installed.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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