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Bangkok Airways Flight 125
	A Dash 8-100, similar to the accident aircraft.
Accident
Date	21 November 1990
Summary	Pilot error and spatial disorientation
Site	5 km southwest of Koh Samui Airport ; 9°31′01″N 100°02′11″E / 9.5169°N 100.03631°E
Aircraft
Aircraft type	de Havilland Canada Dash 8-103
Operator	Bangkok Airways
IATA flight No.	PG125
ICAO flight No.	BKP125
Call sign	BANGKOK AIR 125
Registration	HS-SKI
Flight origin	Don Mueang International Airport, Don Mueang, Bangkok, Thailand
Destination	Koh Samui Airport, Koh Samui, Surat Thani Province, Thailand
Occupants	38
Passengers	33
Crew	5
Fatalities	38
Survivors	0

Bangkok Airways Flight 125 was a scheduled domestic flight from Don Mueang International Airport to Koh Samui Airport. On 21 November 1990 the Dash 8-103 operating the flight crashed on approach to Koh Samui Airport during bad weather, five kilometres (3.1 mi; 2.7 nmi) southwest of the airport, killing all 33 passengers and 5 crew. Bangkok Airways Flight 125 was the first fatal accident of Bangkok Airways.^[1]

The subsequent investigation determined that the cause of the accident was the pilots suffering spatial disorientation that led to a loss of control.

Accident

Flight 125 departed Don Mueang International Airport at 09:58 UTC. The flight was conducted under IFR and proceeded to climb to a flight level of 210 (21,000 feet (6,400 m)). At 10:45 as the aircraft approached Koh Samui Airport, the crew contacted the control tower and were informed that runway 17 was active. The tower also advised that the weather was mild with rain southeast of the airport. Due to changing wind conditions on the ground the crew was instructed to use runway 35. While attempting to line up for runway 35, errors caused the crew to perform a missed approach. The tower directed the aircraft to make left turn to avoid mountains and flight 125 started a left roll with flaps fully extended in heavy rain. The crew became disoriented and began descending while still in a left roll. The aircraft crashed into a coconut farm 5 km (3.1 mi; 2.7 nmi) southwest of Koh Samui Airport, with the loss of all 33 passengers and 5 crew. Bangkok Airways Flight 125 was the first fatal accident of Bangkok Airways.^[1]

Aircraft

The aircraft involved was a De Havilland Canada Dash 8-103, MSN 172, registered as HS-SKI, that was manufactured by de Havilland Canada in 1989. It had logged approximately 3416 airframe hours and 2998 takeoff and landing cycles. It was also equipped with two Pratt & Whitney Canada PW120A engines^[1]