Airworthiness directives › 2021-08-16
AD 2021-08-16 Airworthiness Directives; PZL Swidnik S.A. Helicopters
Models named: W-3A. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to PZL Swidnik S.A. (PZL) Model W-3A helicopters, certificated in any category, with a Collins Aerospace (formerly Goodrich) electric hoist (hoist) part number (P/N) 76378-500 with a stainless steel cable (cable) P/N 712952 installed.
Compliance
Comply with this AD within the compliance times specified, unless accomplished previously.
Required actions
(1) Within 25 hours time-in service on the hoist (hoist hours) after the effective date of this AD, and thereafter at intervals not to exceed 25 hoist hours: (2) Remove the bottom part of the hook assembly, disengage and lift the hook assembly, clean the cable near the swaged terminal, and visually inspect for wear and damage. For the purposes of this AD, damage may be indicated by broken wires, kinks, bird cages, flattened areas, abrasion, necking, corrosion, or fretting. Visually inspect the area at no less than 12 cm of the cable between the cable swaged terminal and the hook assembly, as depicted in Figures 2 and 3 of Goodrich Actuation Systems Alert Service Bulletin 76378-500-25-P01, Revision 0, dated December 3, 2019 (ASB 76378-500-25-P01). (i) If the cable is worn or damaged, before the next hoist operation, remove the cable from service and replace with an airworthy part. Within 30 calendar days, email the non-compliant information in accordance with paragraph 3.A.(4)(a) of ASB 76378-500-25-P01 to PL-CustomerSupport.AW@leonardocompany.com. (ii) If there is no damage, before the next hoist operation, inspect the cable diameter restriction on the 12 cm length ensuring the cable diameter is ≥4.60 mm (0.181 in) paying particular attention to the cable diameter which is approximately 1 cm from the cable swaged terminal. (iii) If the cable diameter is less than 4.60 mm (0.181 in), before the next hoist operation, replace the cable with an airworthy part. Within 30 calendar days, email the non-complaint information in accordance with paragraph 3.B.(1)(f) of ASB 76378-500-25-P01 to PL-CustomerSupport.AW@leonardocompany.com. (iv) If the cable diameter is ≥4.60 mm (0.181 in), lubricate the cable with oil MIL-L-23699 or MIL-L-7808, or equivalent, reassemble bottom part of the hook assembly on the upper part, and bring the hook assembly back to the stowage position. (3) As of the effective date of this AD, do not install a hoist or cable with a P/N identified in paragraph (c) of this AD unless they meet the conditions as required by paragraph (g) of this AD.
Unsafe condition
This AD defines the unsafe condition as wear and reduction of the cable diameter near the swaged terminal due to movement of the hook assembly. This condition could result in reduced strength of the cable, potentially resulting in an in-flight loss of the hoist load, injury to persons, and reduced control of or damage to the helicopter.
Affected ADs
None.
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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