Airworthiness directives › 2026-02-02
AD 2026-02-02 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.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
(1) Within 100 hours time-in-service (TIS) or 3 months, whichever occurs first after the effective date of this AD: (i) Remove each MRB attachment bolt part number (P/N) 37.21.000.50.00 and clean it, in accordance with Chapter II Accomplishment Instructions, paragraph 2.2 of PZL-Świdnik Alert Service Bulletin No. ASB-37-24-347, dated July 11, 2024 (PZL ASB-37-24-347). (ii) Inspect each cleaned MRB attachment bolt for surface corrosion, pitting corrosion, or mechanical damage (defects), and damaged or missing protective coating as specified in Attachment 1, Criteria for Assessing Bolt Serviceability, paragraphs 1. and 2., of PZL ASB-37-24-347. (iii) If there is any defect (surface corrosion, pitting corrosion, or mechanical damage), polish the affected area with sandpaper and determine if the MRB attachment bolt is within repairable limits as specified in Attachment 2, Bolt Repair, of PZL ASB-37-24-347. (A) If the MRB attachment bolt is within repairable limits, before further flight repair the bolt in accordance with Attachment 2 Bolt Repair, of PZL ASB-37-24-347. (B) If the MRB attachment bolt is beyond repairable limits, before further flight, remove the MRB attachment bolt from service and replace it with a serviceable bolt. (2) Thereafter, repeat the actions required by paragraphs (g)(1)(i) through (iii) in accordance with the inspection intervals in table 1 to paragraph (g)(2) of this AD. Table 1 to Paragraph ( g )(2)—Inspection Intervals Inspection results and/or action(s) accomplished during the last inspections Repetitive intervals (hours TIS or calendar time, whichever occurs first) No defects of any bolt and no damaged or missing protective coating of any bolt were found or The damaged or missing protective coating of each discrepant and each repaired bolt has been renewed/applied or All the discrepant bolts or all the affected parts have been replaced with serviceable parts Within 300 hours TIS or 12 months, whichever occurs first, since the last inspection. No defects of any bolt were found and for which the protective coating was found damaged during the last inspection and the protective coating has not been renewed Within 25 hours TIS or 6 months, whichever occurs first, since the last inspection. (3) Within 30 days after each inspection required by this AD, report the inspection results to PZL-Swidnik S.A. The report must include the information specified in Chapter VI, paragraph 2.3 of PZL ASB-37-24-347.
Unsafe condition
This AD was prompted by a report of corrosion on main rotor blade (MRB) attachment bolts. The FAA is issuing this AD to address corrosion on the MRB attachment bolts, which if not detected and corrected, could lead to cracks and failure of one or more of the attachment bolts, resulting in loss of an MRB and consequent loss of control of the helicopter.
Affected ADs
None.
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