NTSB Identification: ANC91IA028.
The docket is stored on NTSB microfiche number 45884.
Scheduled 14 CFR operation of MARKAIR, INC.
Incident occurred Wednesday, February 13, 1991 in UNALASKA, AK
Probable Cause Approval Date: 03/09/1993
Aircraft: BOEING 737-200, registration: N672MA
Injuries: 46 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.
THE RUNWAY ALIGNS FROM THE SOUTHEAST TO THE NORTHWEST AND WITHIN 150 FEET EAST OF THE RUNWAY IS A 1,634 FOOT HIGH MOUNTAIN. THE WIND WAS FROM THE NORTHWEST AT 14 KNOTS, GUSTING TO 25 KNOTS. THE LANDING THRESHOLD FOR RUNWAY 30 WAS DIRECTLY DOWNWIND OF THE MOUNTAIN. DURING THE FINAL APPROACH, THE FIRST OFFICER NOTICED A PLUS 30 KNOT DEVIATION IN THE AIRSPEED AND CALLED FOR THE CAPTAIN TO INITIATE A GO AROUND. THE CAPTAIN HAD ALREADY APPLIED POWER WHEN THE AIRPLANE BEGAN TO SINK AND ROLL TO THE RIGHT. THE RIGHT WING TIP SCRAPED THE RUNWAY SURFACE DURING THE GO AROUND.
The National Transportation Safety Board determines the probable cause(s) of this incident to be: THE WINDSHEAR ENCOUNTERED ON SHORT FINAL. CONTRIBUTING TO THE ACCIDENT WAS THE RISING TERRAIN WITHIN 150 FEET OF THE RUNWAY, THE VARIABLE NATURE OF THE WIND DUE TO THE RISING TERRAIN, AND THE PILOT'S FAILURE TO MAINTAIN LATERAL CONTROL DURING THE GO AROUND.
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