6 fatalities

1999-04-07: Boeing 737-400 (TC-JEP) — Turkish Airlines - THY Türk Hava Yollari — Ceyhan, Turkey

Ceyhan, TurkeyFlight

On April 7, 1999, a Boeing 737-400 (registration TC-JEP) operated by Turkish Airlines - THY Türk Hava Yollari was involved in an aviation accident near Ceyhan, Turkey in flight. 6 people were killed. Investigators recorded the probable cause as: The accident was driven by improper checklist execution regarding anti-ice systems and crew distraction, compounded by severe weather and unaddressed airspeed discrepancies. This summary draws on records from the Bureau of Aircraft Accidents Archives (B3A); 16 related events involving the same aircraft type or operator are linked below.

Sourcesthe Bureau of Aircraft Accidents Archives (B3A)Primary reportUpdated 1781204457Data APIEditorial standards
Aircraft registered TC-JEP
Aircraft registered TC-JEP. Photo: Stuart Jessup / CC BY-SA 2.0, via Wikimedia Commons

An aircraft crashed near Ceyhan, Turkey, while climbing through 4,000 metres during a positioning flight to Jeddah.

What happened

At 00:36 local time, an aircraft departed from runway 05 at Adana Airport. The mission was a positioning flight intended to transport Turkish pilgrims to Jeddah, Saudi Arabia. Approximately nine minutes after the departure, while the aircraft was climbing to an altitude of 4,000 metres, it encountered adverse weather conditions.

During this climb, the aircraft experienced a sudden nose-down movement and entered a steep dive. The plane struck an open field located roughly 30 km east of Adana Airport near Ceyhan in a nearly vertical orientation. The impact was so forceful that the aircraft type disintegrated upon hitting the ground, creating a crater approximately 10 metres deep. There were no survivors of the accident.

Findings

Investigations into the crash identified several contributing factors related to flight preparation and crew performance. It was determined that severe weather played a role in the accident. Additionally, the failure to activate the Pitot static anti-ice system due to an incomplete pre-takeoff checklist was a significant factor.

Further findings indicated that the crew did not identify the source of erratic airspeed readings and failed to utilize alternative cockpit instruments to maintain control or recover the aircraft. The investigation also noted that the presence of cabin crew within the cockpit likely served as a distraction to the flight crew during the critical phase of flight.

Probable cause

The accident was driven by improper checklist execution regarding anti-ice systems and crew distraction, compounded by severe weather and unaddressed airspeed discrepancies.