Investigation Summary
On the morning of December 7, 1983, Madrid-Barajas Airport was blanketed in thick fog with visibility reported around 300 meters. Iberia Flight 350, a Boeing 727, was cleared for takeoff on Runway 01. Simultaneously, Aviaco Flight 134, a DC-9, was instructed to taxi to the holding point for the same runway via the outer taxiway. Due to the lack of clear visual references and inadequate signage, the Aviaco crew became lost in the fog. Instead of following the taxiway to the threshold, they inadvertently turned onto the active runway. As the Iberia 727 accelerated through its takeoff roll and reached V1, the crew suddenly saw the DC-9 through the fog. The Iberia captain attempted to rotate early to clear the obstacle, but the aircraft's left wing and landing gear struck the DC-9. The impact triggered a massive fire that consumed both airframes.
Final Conclusions
The CIAIAC determined the primary cause was the unauthorized incursion of the DC-9 onto the active runway. This was attributed to the intense fog which prevented the crew from obtaining sufficient visual references to navigate the taxiway system. Contributing factors included the inadequate state of airport signage, markings, and lighting, which failed to provide the necessary guidance to the crew under low-visibility conditions.
Video Analysis
No video analysis linked for this case file yet.
Airframe & Maintenance
Iberia IB350 — Boeing 727-256 · EC-CFJ
Aviaco AO134 — McDonnell Douglas DC-9-32 · EC-CGS
Crew Experience
Captain
Iberia Flight 350
First Officer
Iberia Flight 350
Captain
Aviaco Flight 134
First Officer
Aviaco Flight 134
Systems & Failure Modes
Airport Signage and Markings
Inadequate taxiway markings and signs failed to prevent the DC-9 crew from entering the active runway in low visibility.
Ground Radar
The lack of operational ground movement radar prevented controllers from seeing the DC-9's incorrect position.
Interesting Facts
- 01All 42 occupants of the Aviaco DC-9 perished in the collision and fire.
- 02The Iberia 727 was 9 years old and had completed 19,936 cycles at the time of the crash.
- 03Visibility at the time of the accident was approximately 300 meters due to intense fog.
- 04The collision occurred near the intersection of the runway and the taxiway the DC-9 was supposed to use.
Safety Actions & Advisories
Airport Infrastructure Improvements
Following the accident, Madrid-Barajas underwent significant upgrades to runway and taxiway lighting, signage, and painted markings to meet international standards for low-visibility operations.