What happened
On April 26, 2012, a Fokker 100 was involved in a ground incident during pre-flight operations at Warsaw Chopin Airport (WAW). After the aircraft had completed its taxi instructions for takeoff, a ground movement coordinator was checking the availability of the stand when they discovered that the fuel filler cap had not been replaced.
Upon discovery, the Tower (TWR) was notified, and the aircraft's taxiing was immediately halted. The crew subsequently returned the aircraft to its parking stand, where the cap was properly installed. Following a full aircraft inspection, the aircraft was cleared to proceed with its taxi for departure.
The investigation
The PKBWL investigation focused on the sequence of events leading from the completion of refueling to the discovery of the unsecured cap. The investigation examined the ground handling procedures and the crew's pre-flight inspection protocols to determine why the fuel cap remained unsecured during the taxi phase.