Airworthiness Directive · Amendment 39-21410 · Engine mount section
Leonardo S.p.a. Helicopters
This airworthiness directive (AD) applies to 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.
The FAA is adopting a new airworthiness directive (AD) for certain Leonardo S.p.a. (Leonardo) Model AB139 and AW139 helicopters. This AD requires removing certain engine mounting rods from service and prohibits their installation on any helicopter. This AD was prompted by a report of non-conforming engine mounting rods. The actions of this AD are intended to address an unsafe condition on these products.
You are responsible for performing each action required by this AD within the specified compliance time unless it has already been accomplished prior to that time.
(1) Before further flight, determine the total hours time-in-service (TIS) of each engine mounting rod.
(2) 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:
(i) 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 ASB 139-593 and by following the Accomplishment Instructions, paragraphs 3.1 and 3.2 of ASB 139-593, except you are not required to discard the Number 1 engine outboard mounting rod or comply with the “Scrap Report” instruction in paragraph 3.1 of ASB 139-593.
Note 1 to paragraphs (e)(2)(i) through (iv): Figure 1 of ASB 139-593 shows the engine outboard and inboard mounting rod assemblies for the left-hand side only, the right-hand side is symmetrical.
(ii) 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 “C” of Figure 1 of ASB 139-593 and by following the Accomplishment Instructions, paragraphs 3.3 and 3.4 of ASB 139-593, except you are not required to discard the Number 1 engine inboard mounting rod or comply with the “Scrap Report” instruction in paragraph 3.3 of ASB 139-593.
(iii) 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 “B” of Figure 1 of ASB 139-593 and by following the Accomplishment instructions, paragraphs 4.1 and 4.2 of ASB 139-593, except you are not required to discard the Number 2 engine outboard mounting rod or comply with the “Scrap Report” instruction in paragraph 4.1 of ASB 139-593.
(iv) 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 “C” of Figure 1 of ASB 139-593 and by following the Accomplishment instructions, paragraphs 4.3 and 4.4 of ASB 139-593, except you are not required to discard the Number 2 engine inboard mounting rod or comply with the “Scrap Report” instruction in paragraph 4.3 of ASB 139-593.
(3) As of the effective date of this AD, do not install on any helicopter an engine mounting rod with a P/N and S/N listed in paragraph (a) of this AD.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
Aircraft
