NTSB Identification: DEN89IA067.
The docket is stored on NTSB microfiche number 38040.
Nonscheduled 14 CFR PORTS OF CALL AIR
Incident occurred Sunday, January 22, 1989 in SALT LAKE CITY, UT
Probable Cause Approval Date: 08/26/1992
Aircraft: BOEING 707-323B, registration: N712PC
Injuries: 194 Uninjured.
NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.
PLT WAS EXECUTING CATEGORY I ILS APCH TO RWY 34L AFTER FLYING FROM HON TO SLC. PLT SAID HE 'CAME OFF GAUGES' AT 300 FT AGL EXPECTING TO SEE RWY BUT DIDN'T. AT 200 FT AGL, HE SAW RWY 150 FT TO LEFT BUT LOST ALL DEPTH PERCEPTION. PLT CONSIDERED EXECUTING MISSED APCH BUT FELT HE COULD ALIGN ACFT WITH RWY WITH ALT REMAINING. WHILE MANEUVERING, NO. 1 ENG STRUCK RWY, LEAVING 50-60 FT LONG, 1-INCH DEEP GOUGE. IN PREVIOUS 30 HR PERIOD, PLT HAD BEEN ON DUTY 18 HRS, 30 MIN, AND HAD FLOWN 13 HRS, 25 MIN. HE HAD BEEN OFF DUTY 11 HRS, 24 MIN, BUT HAD SLEPT ONLY 1 HR.
The National Transportation Safety Board determines the probable cause(s) of this incident to be: THE PILOT-IN-COMMAND'S ATTEMPT TO ALIGN THE AIRPLANE WITH THE RUNWAY AT AN ALTITUDE INSUFFICIENT FOR SAFE MANEUVERING, RESULTING IN THE NO. 1 ENGINE STRIKING THE RUNWAY. CONTRIBUTING FACTORS INCLUDE OBSCURED VISIBILITY DUE TO FOG, THE CAPTAIN'S LOSS OF DEPTH PERCEPTION, AND PILOT FATIGUE DUE TO DISRUPTED CIRCADIAN RHYTHM.
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