Airworthiness Directive · Amendment 39-21510 · Equip/furnishing system wiring
PZL Swidnik S.A. Helicopters
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.
The FAA is adopting a new airworthiness directive (AD) for PZL Swidnik S.A. (PZL) Model W-3A helicopters. This AD requires repetitive inspections of a certain part-numbered stainless steel cable (cable) installed on a certain part-numbered hoist assembly, and depending on those inspection results, removing certain parts from service and reporting the results. This AD also prohibits installing the affected part unless it is inspected per the AD requirements. This AD was prompted by wear of and damage to the cable near the swaged terminal due to movement of the hook assembly. The actions of this AD are intended to address an unsafe condition on these products.
(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.
