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NTSB Report
February 13, 1991 · Boeing 737-200 · N672MA
Unalaska, AK
Overview
Report Status
Probable Cause
Event Type
Incident
Date
February 13, 1991
Injury Outcomes
No injuries (46 uninjured)
Location
Unalaska, AK
Aircraft
Boeing 737-200
Tail Number
N672MA
Operator
Markair
Injuries
None
Aircraft Damage
Minor
NTSB Number
ANC91IA028
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.
NTSB Probable Cause
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.
Full Narrative
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.
Flight
Event TypeIncident
Event Time07:39 AKST
Nearest AirportUNALASKA (0nm)
Runway3
Runway Length3800 ft
Runway Width100 ft
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftBoeing 737-200
Tail NumberN672MA
Aircraft CategoryAir
DamageMinor
OperatorMarkair
Operating RulePart 121
Engines2
Engine TypeTurbojet
Engine DetailsP&W · JT8D · Turbojet
Seats50
People & Injuries
Injury SummaryNo injuries (46 uninjured)
Fatal0
Serious0
Minor0
Uninjured46
Total46
Crew 1Age 46 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind350° @ 15 kt, gusting 26 kt
Visibility6 sm
CeilingBroken clouds 2700 ft
Temperature / Dew Point28 C / 25 C
Altimeter29.00 inHg
Observation Time15:50
Weather SourceWFAC