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Korean Airlines Flight 007 (view source)
Revision as of 07:00, February 16, 2009
, 07:00, February 16, 2009→Capabilities and Damage to Hydraulics
===Capabilities and Damage to Hydraulics===
===Capabilities and Damage to Hydraulics===
With only one of the four redundancy designed hydraulic systems fully operational (making control difficult, but by no means impossible), and with wing flaps up, “control was reduced to the right inboard aileron and the innermost of the spoiler section on each side.”G. Norris and M. Wagner in Boeing (MBT Publishing, Osceolo, WI 1998) explain (pg. 128) the safety benefits of multiple redundant hydraulic systems for the Boeing 747, '''"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."'''
With only one of the four redundancy designed hydraulic systems fully operational (making control difficult, but by no means impossible), and with wing flaps up, “control was reduced to the right inboard aileron and the innermost of the spoiler section on each side.” G. Norris and M. Wagner in Boeing (MBT Publishing, Osceolo, WI 1998) explain (pg. 128) the safety benefits of multiple redundant hydraulic systems for the Boeing 747,
<blockquote>
"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."
</blockquote>
===Flight Capability Evaluation===
===Flight Capability Evaluation===