Loke said the ministry was unhappy with the spate of disruptions in the past four months despite the airport operator stating that the aerotrain reported a 99.2% reliability.

“The backup shuttle bus service must remain available,” he told reporters after chairing a close door meeting with the National Logistics Task Force (NLTF) today.

The aerotrain service broke down again on Tuesday, which MAHB attributed to a power system malfunction. The disruption forced passengers to walk along the tracks in the dark while carrying their luggage.

It was the second disruption in a month and it prompted Loke to order the Land Public Transport Agency (Apad) to investigate the matter.

On Oct 15, the aerotrain service was disrupted after both train units experienced a temporary power trip. The aerotrain also broke down on Sept 4 because of a similar cause.

Loke went on to say that punitive action against MAHB could only be taken after investigations have been completed, with the maximum fine capped at RM250,000 per incident.

“Some disruptions were caused by passengers forcing doors shut, but there were also technical failures that should not have happened. Once verified, penalties will be imposed.”