Accident
Last updated: 18 April 2014
Status:Definitief
Datum:dinsdag 11 oktober 1983
Tijd:20:53 CDT
Type:Hawker Siddeley HS-748-FAA Srs. 2A
Luchtvaartmaatschappij:Air Illinois
Registratie: N748LL
Constructienummer: 1716
Bouwjaar: 1972
Aantal vlieguren:21182
Aantal vluchten:32350
Motoren: 2 Rolls Royce 535-2 Dart
Bemanning:slachtoffers: 3 / inzittenden: 3
Passagiers:slachtoffers: 7 / inzittenden: 7
Totaal:slachtoffers: 10 / inzittenden: 10
Schade: Vernield
Gevolgen: Written off (damaged beyond repair)
Plaats:11 km (6.9 mijl) NE of Pickneyville, IL (   Verenigde Staten) show on map
Fase: Nadering (APR)
Soort vlucht:Binnenlandse lijnvlucht
Vliegveld van vertrek:Springfield-Capital Airport, IL (SPI/KSPI), Verenigde Staten
Vliegveld van aankomst:Carbondale-Southern Illinois Airport, IL (MDH/KMDH), Verenigde Staten
Vluchtnummer: 710
Beschrijving:
Flight 710 departed Chicago, IL for a flight to Carbondale, IL via Springfield, IL. The flight was about 45 minutes behind schedule when it arrived at Springfield, about 20:05. At 20:11, the flightcrew were provided with the latest Carbondale weather: ceiling and visibility were 2,000 feet overcast and 2 miles, respectively, with light rain and fog. The crew then requested its IFR clearance, with 5,000 feet for its en route altitude. At 20:16, Flight 710 was cleared to taxi to runway 15 for takeoff. The aircraft took off at 20:20 and climbed to cruising altitude. At 20:21:34, Flight 710 informed the departure controller that it had experienced a "slight electrical problem..." and that it would keep the controller "advised." The flight then requested and was cleared to maintain 3,000 feet. At 20:23:54, the first officer told the captain that "the left (generator) is totally dead, the right (generator) is putting out voltage but I can't get a load on it." At 20:24:26, the first officer reported, "zero voltage and amps (amperes) on the left side, the right (generator) is putting out twenty-seven and a half (volts) but I can't get it to come on the line." The battery voltage further dropped to 22 volts. The crew a.o. shut off excess cabin lights because of the electrical problem. About 20:38, the first officer mistakenly isolated the right generator and right generator bus bar from the aircraft's dc electrical distribution system. Radio contact was lost when the flight was requested to change radio frequencies. At 20:52 the captain decided to descend to 2,400 feet and the voltage had further dropped to 13 volts. The aircraft continued to descend and struck the ground in an open pasture area.

PROBABLE CAUSE: "The captain's decision to continue the flight toward the more distant destination airport after the loss of d.c. electrical power from both aircraft generators instead of returning to the nearby departure airport. The captain's decision was adversely affected by self-imposed psychological factors which led him to assess inadequately the aircraft's battery endurance after the loss of generator power and the magnitude of the risks involved in continuing to the destination airport. Contributing to the accident was the airline management's failure to provide and the FAA's failure to assure an adequate company recurrent flight crew training programme which contributed to the captain's inability to assess properly the battery endurance of the aircraft before making the decision to continue, and led to the inability of the captain and the first officer to cope promptly and correctly with the aircraft's electrical malfunction."
Patricia A. Goldman, Vice Chairman, filed the following concurring/dissenting statement:
"While the accident report correctly identifies training and surveillance, I believe that inclusion of these items in the probable cause statement obscures and detracts from the basic reason the accident occurred and the attendant safety lesson. The pilot should never have continued the flight to the destination airport, but should have returned to the nearby airport on realizing that electrical d.c. power had been lost."

Bronnen:
» NTSB-AAR-85-03

Official accident investigation report
investigating agency: National Transport Safety Bureau (NTSB) - USA
report status: Final
report number: NTSB/AAR-85-03
report released:05-MAR-1985
duration of investigation:511 days (1 year 4.9 months)
download report: Air Illinois Hawker Siddley, HS 748-2A, N748LL, near Pinckneyville, Illinois, October 11, 1983. (NTSB/AAR-85-03)

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Kaart
Deze kaart geeft het vliegveld van vetrek weer en de geplande bestemming van de vlucht. De lijn tussen de vliegvelden geeft niet de exacte vliegroute weer.
De afstand tussen Springfield-Capital Airport, IL en Carbondale-Southern Illinois Airport, IL bedraagt 231 km (144 miles).

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