Airworthiness directives › 2021-03-07
AD 2021-03-07 Airworthiness Directives; Leonardo S.p.a. Helicopters
Applicability*9
This AD becomes effective April 1, 2021.
Compliance
Actions accomplished before the effective date of this AD in accordance with the procedures specified in Leonardo Helicopters Alert Service Bulletin No. 139-593, dated June 11, 2019, are considered acceptable for compliance with the corresponding actions specified in paragraphs (e)(1) and (2) of this AD.
Required actions
(1) The Manager, International Validation Branch, FAA, may approve AMOCs for this AD. Send your proposal to: Kristi Bradley, Aviation Safety Engineer, General Aviation & Rotorcraft Section, International Validation Branch, FAA, 10101 Hillwood Pkwy., Fort Worth, TX 76177; telephone 817-222-5110; email 9-AVS-AIR-730-AMOC@faa.gov. (2) For operations conducted under a 14 CFR part 119 operating certificate or under 14 CFR part 91, subpart K, the FAA suggests that you notify your principal inspector, or lacking a principal inspector, the manager of the local flight standards district office or certificate holding district office, before operating any aircraft complying with this AD through an AMOC.
Unsafe condition
(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.
Affected ADs
This AD defines the unsafe condition as a non-conforming engine mounting rod. This condition could result in structural failure of the engine mounting rod and subsequent loss of control of the helicopter.
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