Airworthiness Directive · Amendment 39-21683 · Main rotor system
PZL Swidnik S.A. Helicopters
This AD applies to PZL Swidnik S.A. Model PZL W-3A helicopters, certificated in any category, with fairing part number (P/N) 30.23.015.00.03 installed on vibration absorber P/N 30.23.000.00.04 installed.
The FAA is adopting a new airworthiness directive (AD) for certain PZL Swidnik S.A. Model PZL W-3A helicopters. This AD requires visually inspecting the bonding on a certain part-numbered fairing installed on a certain part-numbered vibration absorber, improving the bonding if necessary, using improved installation procedures to secure the fairing to the vibration absorber, and removing certain parts from service. This AD also prohibits installing the affected part unless it is inspected and installed per the AD requirements. This AD was prompted by a report of a broken bolt securing the fairing to the vibration absorber that resulted from an incorrect torque value for the nut used to secure the fairing to the vibration absorber. The FAA is issuing this AD to address the unsafe condition on these products.
Within 300 hours time in service after the effective date of this AD:
(1) Remove from service each bolt P/N 3003A-6-16-3, washer P/N 3402A-1, and castellated nut P/N 3336A-6 that secure the fairing to the vibration absorber.
(2) Visually inspect the bonding between the fairing and the vibration absorber for anodic coating. If there is any anodic coating, before further flight,
(i) Polish the surface of the fairing and vibration absorber in all areas where washers make contact to remove all anodic coating.
(ii) Using 180-220 grit abrasive paper, burnish the surface to improve bonding.
(iii) Wash the surface with extraction naphtha, or equivalent cleaning solution.
(3) Insert a new bolt P/N 3003A-6-16-3 and a new washer P/N 3402A-1 into each hole connecting the fairing to the vibration absorber.
(4) At the vibration absorber star side, install a new washer P/N 3402A-1, and a new castellated nut P/N 3336A-6 onto each bolt. Torque each castellated nut to 5.4 ± 1.0 Nm (0.55 ± 0.10 kGm) and lock each castellated nut with a cotter pin. If the specified torque range cannot be accomplished, remove the washer, bolt, and nut from service, replace these parts with airworthy parts, and reapply torque.
(5) As of the effective date of this AD, do not install vibration absorber P/N 30.23.000.00.04 with a fairing P/N 30.23.015.00.03 on any helicopter unless they are inspected as required by paragraph (g)(2) of this AD and installed as required by paragraphs (g)(3) and (4) of this AD.
