SEPANG: Independent railway assessors have confirmed that the KL International Airport (KLIA) Aerotrain system is operating as intended, with service disruptions since commissioning that are commonly encountered in the early operational phase of complex rail systems.
Malaysia Airports Holdings Bhd (MAHB) said in a statement on Monday (Feb 2) that the assessors found the disruptions do not pose a safety risk, as structured engineering controls and continuous monitoring are in place to manage the issues effectively.
"During the implementation of the Comprehensive Action Plan (CAP), which commenced on Nov 15 last year, Aerotrain operations have remained stable, recording an Operational Service Availability of 100% in December 2025, up from 98.67% in July 2025, reflecting high system availability while inspection, testing and validation activities were carried out," it said.
The independent assessment identified two critical systems with a direct influence on train reliability, service availability, and recovery performance: the power supply system and the rolling stock.
For the power supply system, while the overall design and protection systems were found to be adequate and generally operating as intended, areas such as installation quality, power rail condition monitoring, and clarity of operational roles require continued focus to strengthen long-term reliability.
For the rolling stock, particular attention was paid to the current collector device, which affects traction continuity and service stability due to its close interaction with the power rail.
According to MAHB, the CAP has been implemented through coordinated workstreams covering inspection and rectification, system testing and validation and trial operations.
"Inspection and rectification activities across the Aerotrain system have been completed, with the programme now at the final milestone to close out remaining rectification actions identified during system-wide inspections," it added.
During the CAP period, MAHB said engineering hours were initially scheduled from 9pm to 7am but were later shortened to 11pm to 7am to accommodate festive and school holiday peak periods.
MAHB said it will continue to implement the remaining CAP measures in a coordinated and proportionate manner, supported by ongoing monitoring and independent oversight to further strengthen system reliability and ensure consistent Aerotrain operations at KLIA.
