On 16 September 2015, PZL Mielec reported to the ATSB that:
PZL Mielec will issue a Service Letter … in which it will be stated that if during executing the Service Bulletin no. E/02.170/2000 its executor is not sure that a bore in the PZL M18 wing attachment fitting is correctly inspected for the lack of cracks, he should disassemble the outer wing.
Inspection of the wing attachment fittings with the current inspection processes does not appear to ensure an adequate inspection without removal of the wings. However, the ATSB accepts that a suitable non-destructive inspection procedure that can adequately examine the wing attachment fittings without removing the wings may be developed in the future.
The ATSB has assessed the proposed safety action and considers that it should adequately address the identified safety issue. However, the ATSB will reconsider this assessment when the proposed safety action has taken place to determine if it remains adequate.