Airworthiness directives › 2020-18-08
AD 2020-18-08 Airworthiness Directives; Robinson Helicopter Company
Makes named: robinson. Models named: R44 II. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to Robinson Helicopter Company Model R44 II helicopters, certificated in any category, with an orange silicone engine air induction hose (hose) part number (P/N) A785-31 installed. This AD does not apply to helicopters with a black neoprene hose P/N A785-31 installed.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) For helicopters with serial numbers (S/Ns) 14168 through 14314 inclusive (except S/Ns 14269, 14287, 14299, and 14304), or with an orange silicone hose P/N A785-31 installed after October 1, 2017, and before the effective date of this AD, within 10 hours time-in-service (TIS) after the effective date of this AD: (i) With the hose removed, inspect the inside of the hose for separation between the outer and inner layers, and flex the hose in all directions while listening for a crinkling sound, which is an indication of separation. (ii) If there is any separation or a crinkling sound, before further flight, remove the hose from service. (iii) If there is no separation and no crinkling sound, and the hose is marked with code 3Q17 or 1Q18 or an illegible code, within 50 hours TIS, remove the hose from service. (2) For all helicopters identified in paragraph (c) of this AD, accomplish the inspection required by paragraph (g)(1)(i) of this AD within 100 hours TIS after the effective date of this AD or at the next annual inspection after the effective date of this AD, whichever occurs first, and thereafter at intervals not to exceed 100 hours TIS or at each annual inspection, whichever occurs first. If there is any separation or a crinkling sound, before further flight, remove the hose from service. (3) As of July 5, 2019 (the effective date of AD 2019-12-18), do not install on any helicopter an orange silicone hose P/N A785-31 marked with code 1Q18. (4) As of the effective date of this AD, do not install on any helicopter an orange silicone hose P/N A785-31 marked with code 3Q17 or an illegible code.
Unsafe condition
This AD was prompted by reports of separation between the outer and inner layers of a hose. The FAA is issuing this AD to prevent blockage of air flow to the engine, engine stoppage, and subsequent loss of control of the helicopter.
Affected ADs
This AD replaces AD 2019-12-18, Amendment 39-19673 (84 FR 32028, July 5, 2019) (“AD 2019-12-18”).
Read the original on the Federal Register →
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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