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18:27:26: Stand by, stand by, stand by, set!
18:27:26: Stand by, stand by, stand by, set!
Maintaining control of KAL 007 with three of its four hydraulic systems damaged or out might well have been difficult but by no means impossible. Appendix E (in Rescue 007) contains the transcript of an aircraft being flown eighteen miles with all hydraulics out.
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 747 and give an example.
The explanation -- "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 example -- 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.
==See Also==
==See Also==
*[[Korean Airlines Flight 007]]
*[[Korean Airlines Flight 007]]