Iberia Airlines Flight 610
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An Iberia Boeing 727-200 similar to the one involved.
|Date||19 February 1985|
|Summary||Controlled flight into terrain|
|Site||Mount Oiz, Biscay, Spain|
|Aircraft type||Boeing 727-256|
On 19 February 1985, Iberia Flight 610 crashed into a television antenna on the summit of Mount Oiz in Biscay near Bilbao, Spain. The flight was from Madrid-Barajas Airport to Bilbao Airport. All 141 passengers and 7 crew died in the crash.
The Aircraft 
The aircraft, named Alhambra de Granada, was a Boeing 727-256 – a model of the Boeing 727 with three Pratt & Whitney JT8D-9A turbine engines and capable of carrying 189 passengers – registered as EC-DDU. It had entered service on 18 May 1979 and had flown 13,408 hours at the time of the accident.
The Flight 
Flight 610 departed Barajas-Madrid Airport at 08:47 a.m. and was scheduled to land at 09:35 a.m. at Bilbao airport. While on a standard approach into Bilbao at 4,300 feet (1,310 meters), the crew switched on the altitude alert system whilst flying through overcast and rainy weather. The terrain alarm went off when the plane reached 4,040 feet (1,231 meters); the captain interpreted this to be the approach alert mode alarm and ignored it and continued the descent. The aircraft collided with an antenna tower at 3,356 feet (1,023 meters), shearing off its left wing, and then crashed, killing all 148 people on board.
Investigators blamed the cause of the crash on pilot error because the flight crew misinterpreted data and flew the aircraft below the safety altitude. The accident report stated:
"Their [i.e. the pilots'] confidence on the automatic capture performed by the Altitude Alert System, the misinterpretation of its warnings, as well as a probable misreading of the altimeter made the crew fly below the safety altitude, colliding into the television antennas' base, thus losing the left wing, falling to the ground with no possible control of the aircraft.".
- Technical Report A-009/1985 - Accidente ocurrido el 19 de Febrero de 1985 a la aeronave Boeing 727-256, matrícula EC-DDU en el Monte Oiz (Vizcaya) / CIAIAC
- Flight 610 final report
- ASN flight 610 report
- El accidente del monte Oiz: La mayor tragedia de aviación en Euskadi on YouTube (Spanish)