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Korean Airlines Flight 007 (view source)
Revision as of 01:24, December 1, 2010
, 01:24, December 1, 2010→Capabilities and Damage to Hydraulics
"The hydraulics provided actuation for all the primary flight controls; all secondary flight controls (except leading edge flaps); and landing gear retraction, extension, gear steering, and wheel braking. Systems 1 and 4 could be used for all purposes [KAL 007's hydraulic system no. 4 was undamaged], while systems 2 and 3 were normally used for flight control only... System 4 also had a third electrical power source. Each primary flight control axis received power from all four hydraulic systems."
"The hydraulics provided actuation for all the primary flight controls; all secondary flight controls (except leading edge flaps); and landing gear retraction, extension, gear steering, and wheel braking. Systems 1 and 4 could be used for all purposes [KAL 007's hydraulic system no. 4 was undamaged], while systems 2 and 3 were normally used for flight control only... System 4 also had a third electrical power source. Each primary flight control axis received power from all four hydraulic systems."
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KAL 007 would exhibit a flight capability after the attack which would include a pull up to pre detonation altitude 0f 35,000 ft., a gradual descent until leveling out at 16,424 ft (5,000 meters), a flight of almost 5 minutes at that altitude and then slow spiral descent of Moneron Island, the only land mass in the whole Tatar straits. During this flight it was able also to negotiate turns. One of its four hydraulic systems evidenced no damage from the missile attack. There are three incidents where aircraft with one or even no hydraulic power were able to fly and maneuver with zero hydraulics. In July of 1971, Pan Am's flagship aircraft, a Boeing 747, registered N747PA, hit a light gantry upon take-off from San Francisco International Airport. The crew had misjudged the speed of the aircraft and the length of the runway. As the plane pulled up sharply in an attempt to clear it, the rear end of the fuselage came down on the gantry. The aircraft continued to take off and with the gantry stuck in its cargo area and with three of the hydraulic systems destroyed. The jumbo jet circled the airport and made a safe landing -- still with the gantry stuck through its cargo area and only one hydraulic system operational. On July 19, 1989, Capt. Al Hanes flew United Flight 232 with zero hydraulic to an emergency landing at Sioux City, Iowa airport. The crew had limited control by using thrust modulation (symmetric thrust for pitch, differential thrust for yaw/roll). The aircraft eventually skidded of the runway and overturned in a field killing 110 of its 285 passengers and one of the 11 crew members. The third incidence involved the attempted shootdown of a DHL aircraft. On November 22, 2003, a missile took out portions of the left wing and collateral damage took out all the hydraulic systems. As in the case of the 1989 United Airlines Flight 232, the Captain could only use thrust to modify pitch, speed and altitude and vary throttles asymmetrically to control yaw and turn the aircraft. There were no casualties as the aircraft safely returned and landed at Baghdad International airport.
===Flight Capability Evaluation===
===Flight Capability Evaluation===