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At 12.30h a bomb explodes in the Las Palmas passenger terminal. Because of warnings of a possible second bomb, the airport
was closed. A large number of flights were diverted toTenerife, a.o. KLM Flight 4805 from Amsterdam and PanAm Flight 1736 (coming from Los Angeles and New York). Las Palmas Airport opened to traffic again at 15.00h. Because the PanAm passengers remained on aboard it was possible to leave Tenerife at once.
The taxiways were congested by other aircraft however. This meant the PanAm crew had to backtrack on Runway 12 for take-off on Runway 30. The entrance to Runway 12 however, was blocked by the KLM Boeing. The PanAm flight had to wait for almost 2 hours before all KLM passengers (except 1) had reboarded and refuelling had taken place. The KLM flight was then cleared to backtrack Runway 12 and make a 180deg. turn at the end.
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Three minutes later (at 17.02h) Pan Am 1736 was cleared to follow the KLM aircraft and backtrack Runway 12. The PanAm crew were told to leave the runway at the third taxiway and report leaving the runway. At 17.05:44h KLM 4805 reported ready for take-off and was given instructions for a Papa beacon departure. The KLM crew repeated the instructions and added "We are now at take-off". The brakes were released and KLM 4805 started the take- off roll. Tenerife tower, knowing that Pan Am 1736 was still taxying down the runway replied "OK ...... Stand by for take-off, I will call you." This message coincidedwith the PanAm crew's transmission "No ... uh we're still taxiing down the runway, the Clipper 1736". These communications caused a shrill noise in the KLM cockpit,lasting approx. 3.74 seconds. Tenerife tower replied: "Papa Alpha 1736 report runway clear.",wereupon the PanAm crew replied: "OK, will report when we're clear". This caused some concerns with the KLM flight engineer asking the captain: "Is he not clear then?" After repeating his question the captain answers emphatically: "Oh, yes".
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A number of seconds before impact the KLM crew saw the PanAm Boeing still taxiing down the runway. The crew tried to climb away and became airborne after a 65ft taildrag in an excessive rotation.The PanAm crew immediately turned the aircraft to the right and applied full power. The KLM aircraft was airborne, but the fuselage skidded over the PanAm's aft fuselage, destroying it and shearing off the tail. The KLM aircraft flew on and crashed out of control 150m further on, sliding another 300m bursting into flames.
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