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The mid-air collision occurred at an altitude of approximately 33,000 feet.
Answer: True
Explanation: The collision took place at an altitude of approximately 33,000 feet, which corresponds to Flight Level 330.
The collision happened on September 10, 1976, at 10:14:41 UTC.
Answer: True
Explanation: The mid-air collision occurred precisely at 10:14:41 UTC on September 10, 1976.
The collision occurred over Samoborec, Croatia, within Yugoslavian airspace.
Answer: True
Explanation: The collision took place over Samoborec, a location within Croatia, which was then part of Yugoslavia.
The collision involved the wingtip of the DC-9 striking the forward section of the Trident's fuselage.
Answer: True
Explanation: The impact occurred when the last five meters of the DC-9's left wing collided with the Trident's cockpit and forward passenger compartment.
The collision occurred at Flight Level 330, approximately 33,000 feet.
Answer: True
Explanation: The collision took place at an altitude of approximately 33,000 feet, corresponding to Flight Level 330.
The collision happened over Yugoslavia.
Answer: True
Explanation: The collision occurred over Samoborec, Croatia, which was part of Yugoslavia at the time.
The collision occurred at 10:14:41 UTC on September 10, 1976.
Answer: True
Explanation: The mid-air collision occurred precisely at 10:14:41 UTC on September 10, 1976.
The collision happened at an altitude of approximately 10,000 meters.
Answer: False
Explanation: The collision occurred at approximately 33,000 feet, not 10,000 meters. 33,000 feet is approximately 10,000 meters, but the primary unit used in aviation for this altitude is feet.
What was the date of the catastrophic mid-air collision near Zagreb?
Answer: September 10, 1976
Explanation: The catastrophic mid-air collision near Zagreb occurred on September 10, 1976.
At what altitude did the two aircraft collide?
Answer: Approximately 33,000 feet
Explanation: The mid-air collision occurred at an altitude of approximately 33,000 feet, corresponding to Flight Level 330.
Where did the 1976 Zagreb mid-air collision take place?
Answer: Over Samoborec, near Zagreb, Yugoslavia
Explanation: The collision occurred near Zagreb, specifically over Samoborec in Croatia, which was then part of Yugoslavia.
The mid-air collision near Zagreb in 1976 involved British Airways Flight 476 and Inex-Adria Aviopromet Flight 550.
Answer: True
Explanation: The collision occurred between British Airways Flight 476 and Inex-Adria Aviopromet Flight 550.
British Airways Flight 476 was en route from London Heathrow to Istanbul Ataturk Airport when the collision occurred.
Answer: True
Explanation: British Airways Flight 476 was traveling from London Heathrow Airport to Istanbul Ataturk Airport.
Inex-Adria Aviopromet Flight 550 was a McDonnell Douglas DC-9-32 registered as YU-AJR.
Answer: True
Explanation: Inex-Adria Aviopromet Flight 550 was a McDonnell Douglas DC-9-32 registered as YU-AJR.
British Airways Flight 476 was a Hawker Siddeley Trident 3B.
Answer: True
Explanation: British Airways Flight 476 was a Hawker Siddeley Trident 3B.
Inex-Adria Flight 550 was carrying primarily German tourists returning from Yugoslavia.
Answer: True
Explanation: The passengers on Inex-Adria Flight 550 were predominantly German tourists.
The 'Bealine' callsign used by BA476 was standard for British Airways at the time.
Answer: False
Explanation: The standard call sign for British Airways was 'Speedbird.' BA476 used 'Bealine 476' because its aircraft was a former British European Airways plane.
British Airways Flight 476 carried 63 people, including 9 crew members.
Answer: True
Explanation: British Airways Flight 476 carried a total of 63 individuals, comprising 54 passengers and a crew of 9.
Inex-Adria Flight 550 originated from Split Airport.
Answer: True
Explanation: Inex-Adria Flight 550's origin was Split Airport in Yugoslavia.
The call sign ADRIA 550 was used by Inex-Adria Flight 550, not British Airways Flight 476.
Answer: True
Explanation: ADRIA 550 was the call sign for Inex-Adria Flight 550. British Airways Flight 476 used the call sign BEALINE 476.
Inex-Adria was a charter airline based in Slovenia, Yugoslavia.
Answer: True
Explanation: Inex-Adria was a charter airline headquartered in Slovenia, which was then part of Yugoslavia.
The British Airways aircraft, a Hawker Siddeley Trident 3B, was a former British European Airways (BEA) aircraft.
Answer: True
Explanation: The Hawker Siddeley Trident 3B operated by British Airways had previously belonged to British European Airways.
Which two flights were involved in the 1976 Zagreb mid-air collision?
Answer: British Airways Flight 476 and Inex-Adria Flight 550
Explanation: The two aircraft involved in the collision were British Airways Flight 476 and Inex-Adria Aviopromet Flight 550.
What was the intended destination of British Airways Flight 476?
Answer: Istanbul Ataturk Airport
Explanation: British Airways Flight 476 was scheduled to fly from London Heathrow Airport to Istanbul Ataturk Airport.
What type of aircraft was Inex-Adria Aviopromet Flight 550?
Answer: McDonnell Douglas DC-9-32
Explanation: Inex-Adria Aviopromet Flight 550 was a McDonnell Douglas DC-9-32 aircraft.
How many people were on board Inex-Adria Flight 550?
Answer: 113
Explanation: Inex-Adria Flight 550 carried a total of 113 individuals, including 108 passengers and a crew of 5.
What was the registration number of the British Airways Hawker Siddeley Trident?
Answer: G-AWZT
Explanation: The registration number of the British Airways Hawker Siddeley Trident was G-AWZT.
What was the intended origin of Inex-Adria Aviopromet Flight 550?
Answer: Split Airport
Explanation: Inex-Adria Aviopromet Flight 550 originated from Split Airport in Yugoslavia.
What was the call sign for Inex-Adria Aviopromet Flight 550?
Answer: ADRIA 550
Explanation: The designated call sign for Inex-Adria Aviopromet Flight 550 was ADRIA 550.
How many people were on board British Airways Flight 476?
Answer: 63
Explanation: British Airways Flight 476 carried a total of 63 individuals, comprising 54 passengers and a crew of 9.
What was the registration number of the Inex-Adria McDonnell Douglas DC-9?
Answer: YU-AJR
Explanation: The registration number of the Inex-Adria McDonnell Douglas DC-9 was YU-AJR.
What was the intended origin of British Airways Flight 476?
Answer: London Heathrow Airport
Explanation: British Airways Flight 476 originated from London Heathrow Airport in the United Kingdom.
What was the standard call sign for British Airways flights, which BA476 did not use?
Answer: SPEEDBIRD
Explanation: The standard call sign for British Airways is 'Speedbird.' BA476 used 'Bealine 476' due to its aircraft's previous registration.
The primary cause of the 1976 Zagreb mid-air collision was attributed to a mechanical failure in the navigation systems of both aircraft.
Answer: False
Explanation: The official findings indicated that procedural errors by air traffic controllers were the primary cause, rather than mechanical system failures.
The Zagreb air traffic control region in the mid-1970s was characterized by high traffic volume, understaffing, and inadequate equipment.
Answer: True
Explanation: The region faced operational challenges due to high air traffic density, insufficient staffing levels, and outdated or inadequate equipment.
Inex-Adria Flight 550 was cleared to climb to Flight Level 260.
Answer: False
Explanation: Inex-Adria Flight 550 was cleared to climb to Flight Level 350, not Flight Level 260.
The last communication from British Airways Flight 476 confirmed they were squawking transponder code 2312.
Answer: True
Explanation: The final transmission from BA476 confirmed adherence to the instruction to squawk transponder code 2312.
Controller Gradimir Tasić issued a critical instruction to Inex-Adria Flight 550 in Serbo-Croatian, rather than the required English.
Answer: True
Explanation: Controller Gradimir Tasić issued a critical instruction to Inex-Adria Flight 550 in Serbo-Croatian, rather than the required English, violating regulations.
The middle-sector controller, Bojan Erjavec, was involved in clearing JP550 to a higher altitude, but coordination issues involved other controllers.
Answer: True
Explanation: While Bojan Erjavec was involved in the clearance process for JP550, the overall coordination breakdown and the critical error in the upper sector were key factors.
The flight crew of BA476 did not report the collision to Zagreb control.
Answer: True
Explanation: Neither flight crew reported the collision; the event was deduced from witness accounts and radar data.
The collision occurred over the Zagreb VOR navigational aid.
Answer: True
Explanation: The Zagreb VOR served as a crucial reporting point for air traffic control within a busy airway system, and both aircraft were expected to pass it around the time of the collision.
The collision occurred because Inex-Adria Flight 550 was cleared to climb into the path of British Airways Flight 476.
Answer: True
Explanation: The accident resulted from a procedural error that allowed Inex-Adria Flight 550 to climb into the same airspace occupied by British Airways Flight 476.
What was identified as the primary cause of the mid-air collision?
Answer: A procedural error by air traffic controllers
Explanation: The primary cause identified was a procedural error made by air traffic controllers in managing the separation of the two aircraft.
The Zagreb air traffic control region was noted for which operational issues in the mid-1970s?
Answer: High traffic volume, understaffing, and inadequate equipment
Explanation: The Zagreb air traffic control region faced challenges including high air traffic volume, insufficient staffing, and inadequate equipment during the mid-1970s.
What critical factor complicated the coordination for Inex-Adria Flight 550's climb?
Answer: The upper-sector controller was working alone and overwhelmed.
Explanation: The coordination was significantly complicated because the upper-sector controller was working alone due to a late replacement and was overwhelmed with managing air traffic.
What flight level did Inex-Adria Flight 550 request?
Answer: FL350
Explanation: Inex-Adria Flight 550 requested to climb to Flight Level 350.
What specific communication error did controller Gradimir Tasić commit?
Answer: He issued a critical instruction in Serbo-Croatian instead of English.
Explanation: Controller Gradimir Tasić issued a critical instruction to Inex-Adria Flight 550 in Serbo-Croatian, rather than the required English, violating regulations.
The captain of British Airways Flight 476, Dennis Tann, had logged over 10,000 flying hours.
Answer: True
Explanation: Captain Dennis Tann of British Airways Flight 476 possessed extensive experience, having logged 10,781 flying hours.
The captain of Inex-Adria Flight 550, Jože Krumpak, had accumulated over 10,000 flying hours.
Answer: True
Explanation: Captain Jože Krumpak of Inex-Adria Flight 550 had accumulated 10,157 flying hours.
What was the documented flight experience of Captain Jože Krumpak of Inex-Adria Flight 550?
Answer: 10,157 flying hours
Explanation: Captain Jože Krumpak had accumulated 10,157 flying hours at the time of the accident.
Both aircraft involved in the 1976 Zagreb collision were completely destroyed, resulting in 176 fatalities.
Answer: True
Explanation: The collision resulted in the complete destruction of both aircraft and the tragic loss of all 176 lives on board.
The collision near Zagreb in 1976 was the deadliest mid-air collision recorded globally at the time.
Answer: True
Explanation: At the time of the incident, the 1976 Zagreb mid-air collision was the deadliest mid-air collision recorded worldwide.
Controller Gradimir Tasić was the only air traffic controller convicted for his role in the collision.
Answer: True
Explanation: Gradimir Tasić was the sole air traffic controller convicted in relation to the accident.
The collision caused the Inex-Adria DC-9 to disintegrate instantly upon impact.
Answer: False
Explanation: The Inex-Adria DC-9 did not disintegrate instantly; it entered a steep nose-dive after losing a portion of its wing.
Following the accident, Gradimir Tasić served his full seven-year sentence.
Answer: False
Explanation: Gradimir Tasić served approximately two years and three months of his seven-year sentence before being released early.
The collision remains the deadliest aviation accident in the history of both Yugoslavia and Croatia.
Answer: True
Explanation: The 1976 Zagreb mid-air collision holds the grim distinction of being the deadliest aviation accident in the historical records of both Yugoslavia and Croatia.
A baby and a boy were found alive near the crash sites but later died.
Answer: True
Explanation: Initial reports indicated that a baby and a boy were found alive near the crash sites but subsequently died.
The air traffic controller Gradimir Tasić was found to have been unfairly made a scapegoat for the accident.
Answer: True
Explanation: A petition from other air traffic controllers suggested that Gradimir Tasić had been unfairly scapegoated for the accident.
The captain of a Lufthansa flight reported seeing a flash, followed by smoke, and then two descending aircraft just before the collision.
Answer: True
Explanation: The Lufthansa captain's account described seeing a flash and smoke, followed by the observation of two aircraft descending, indicating the collision had occurred.
The Lufthansa aircraft witnessing the event was flying at Flight Level 290.
Answer: True
Explanation: The Lufthansa aircraft was flying at Flight Level 290, approximately 29,000 feet.
The 1976 Zagreb mid-air collision is the deadliest aviation accident in Croatian history.
Answer: True
Explanation: The 1976 Zagreb mid-air collision remains the deadliest aviation accident in the history of Croatia.
How did the captain of a Lufthansa flight describe the visual evidence of the collision?
Answer: He witnessed a flash, then smoke, and two descending aircraft.
Explanation: The Lufthansa captain reported seeing a flash, followed by smoke, and then two aircraft descending rapidly towards the ground.
Why was Gradimir Tasić considered a scapegoat?
Answer: Other controllers petitioned, stating he was unfairly blamed.
Explanation: A petition from other air traffic controllers suggested that Gradimir Tasić had been unfairly scapegoated for the accident.
What happened to the Hawker Siddeley Trident after the collision?
Answer: Its forward section disintegrated, causing it to fall near Gaj.
Explanation: The collision caused explosive decompression that disintegrated the forward section of the Trident's fuselage, leading to its crash near Gaj.
What was the approximate altitude of the Lufthansa Boeing 737 that witnessed the collision?
Answer: Flight Level 290
Explanation: The Lufthansa aircraft was flying at Flight Level 290, approximately 29,000 feet.
The book 'Zagreb One Four: Cleared to Collide?' was written by Richard Weston and Ronald Hurst.
Answer: True
Explanation: The book detailing the collision is titled 'Zagreb One Four: Cleared to Collide?' and was authored by Richard Weston and Ronald Hurst.
Which of the following aviation incidents was NOT listed in the 'See also' section of the source material?
Answer: 1985 Japan Airlines Flight 123 crash
Explanation: The 1985 Japan Airlines Flight 123 crash was not listed among the related aviation incidents in the 'See also' section.