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Civil Aviation Authority of Singapore

Southeast Asia Safety Monitoring Agency

Learn about the role that the Southeast Asia Safety Monitoring Agency plays in ensuring aviation safety across regional airspace in the South China Sea region.

Last updated 16 April 2026

As the En-route Monitoring Agency (EMA) for the South China Sea region, the Southeast Asia Safety Monitoring Agency (SEASMA) provides airspace safety assessment and monitoring services to support the introduction and continued safe use of en-route horizontal-plane separation minima.

Establishment of SEASMA

SEASMA was established by CAAS in 2007. This establishment was approved by the Asia/Pacific Air Navigation Planning and Implementation Regional Group (APANPIRG) of the International Civil Aviation Organization (ICAO).

Roles and responsibilities of SEASMA

SEASMA provides airspace safety assessment and monitoring services for the following Flight Information Regions (FIR):


No.

State

FIR

1

China

Sanya

2

Hong Kong, China

Hong Kong

3

Malaysia

Kota Kinabalu, Kuala Lumpur

4

Philippines

Manila

5

Singapore

Singapore

6

Vietnam

Ho Chi Minh

Responsibilities of States and Air Navigation Service Providers

SEASMA relies on data, reports, and the cooperation of participating States and Air Navigation Service Providers overseeing their respective FIRs.

For implementing performance-based horizontal separation minima, they are responsible for:

  1. Designating a primary point of contact to address queries related to horizontal separation monitoring.

  2. Ensuring timely submission of new and withdrawn Performance-based Navigation (PBN) approvals.

  3. Conducting monthly reporting and investigation of navigation errors, including both lateral and longitudinal deviations.

  4. Coordinating with other EMAs to facilitate the exchange of operational data, PBN approvals, and navigation error reports.

  5. Collecting annual traffic sample data to support comprehensive analyses, including risk modelling and separation reduction analysis.

Contact information

Southeast Asia Safety Monitoring Agency (SEASMA)
Contact us using the Enquiries & Feedback Form.