Airworthiness directives › 2021-16-20
AD 2021-16-20 Airworthiness Directives; PZL Swidnik S.A. Helicopters
Models named: PZL 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. 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.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
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.
Unsafe condition
This AD defines the unsafe condition as improper torque of a bolt securing the fairing to the vibration absorber due to lack of information regarding torque value for the nut. This condition could result in detachment of the fairing, causing damage to the main and tail rotor, and subsequent reduced control of the helicopter.
Affected ADs
None.
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