Airports of Thailand (AoT) has ordered a safety check on every moving walkway at Bangkok's Don Mueang airport, after a woman lost a part of her leg after falling on one of the airport's travellators on Thursday.

The incident took place at the South Corridor in the airport's domestic terminal at 8.40am yesterday.

The victim -- whose identity has not been revealed -- was about to board a flight bound for Nakhon Si Thammarat when she fell on the walkway between Gate 4 and Gate 5.

Authorities believe the force of the fall exposed the walkway's safety cover, causing the victim to be drawn into the mechanism.

The AoT said the victim was initially rushed to Bhumibol Adulyadej Hospital for further treatment, as her leg had to be amputated above the left knee by a medical team at the airport.

She was later transferred to Bumrungrad International Hospital for further treatment.

The AoT apologised for the incident and will cover all medical costs and compensate the victim for her injuries.

Authorities will also launch a probe to determine whether the incident was caused by a malfunction or negligence.

The airport's director said all moving walkways across the airport were immediately turned off for a safety check following the incident.

The walkway in the incident was made by Hitachi in Japan and has been in use since 1996.