What happened
On February 4, 2016, a Boeing 737-400 operated by Enter Air sp. z o.o. was being pushed back from its parking stand at Hurghada Airport (HEGN). During this process, the crew received a WING BODY OVERHEAT indication on the left side of the cockpit.
Following the alert, the crew decided to return the aircraft to the parking stand. The event was recorded in the aircraft's technical log (EDP-1), and the Maintenance Control Center (MCC) was notified. Due to the unavailability of additional flight crew members, the captain utilized a specific one-time authorization to permit the flight to proceed under the Minimum Equipment List (MEL) provisions, specifically referencing MEL 26.12 and MEL 21.1.1.1.
Because these MEL restrictions limited the maximum allowable flight level to FL250, the flight plan was updated and additional fuel was loaded to accommodate the lower altitude. The crew operated the aircraft with the left engine bleed air system deactivated. The flight proceeded from Hurghada to Poznań (EPPO).
The investigation
Upon arrival in Poznań, maintenance personnel conducted a thorough inspection of the wing body overheat system. The technical examination included checking for leaks within the system and performing sensor tests, both of which yielded normal results. After a system reset, the overheat indication cleared. Following the successful inspection, the MEL restrictions were lifted, and the aircraft was returned to service without limitations.
Findings
- The investigation determined that the most probable cause of the incident was a malfunction of the wing body overheat indication system for reasons that could not be determined.