Incident Details
On 2 December 2013, during a periodic inspection at the GTL-LOT base at Warsaw Chopin Airport (EPWA), maintenance personnel conducted an operational check of the left and right main landing gear door actuators on an Airbus A321-232, registered to WizzAir Hungary. The check was performed in accordance with JIC12425 and Task Card No 32310502-01, as mandated by Airworthiness Directive No 2011-0069R1 dated 11 April 2012.
During the check, it was observed that the main landing gear doors partially opened and remained at a small distance from the fully closed position. When pulled by hand, the doors opened normally but produced a distinct metallic sound. The operational test was halted, and the operator's Maintenance Control Center (MCC) representative was notified. An internal report was generated.
Findings
The operator contacted AIRTAC, the representative of the Type Certificate holder. AIRTAC requested a sample of hydraulic fluid from the 'green' hydraulic system for additional testing. Additionally, while complying with AIRTAC's request, an error was detected in the maintenance documentation concerning the installation of a bushing, specifically in AMM 32-31-35-400-001-A (installation of the main landing gear door actuator cylinder, revision date November 1, 2013, page 6). The operator's MCC representative was informed and subsequently contacted AIRTAC, which confirmed the error in the data.
Outcome
No further information was available regarding the continuation or conclusion of the investigation. The cause of the incident was not determined, and no safety recommendations were issued.