The internationally accepted collision risk methodology is applied in assessing the safety of implementing the RVSM in the airspace of the Asia Region. The references of the collision risk methodology are as follows:

• Manual on Implementation of a 300 m (1,000 ft) Vertical Separation Minimum Between FL 290 and FL 410 Inclusive, International Civil Aviation Organization, Doc 9574, Montreal, March 1992.
• Review of the General Concept of Separation Panel, Sixth Meeting, Montreal, 28 November – 15 December 1988, ICAO Doc 9536, RGCSP/6, Volumes 1 and 2.
• Review of the General Concept of Separation Panel, Seventh Meeting, Montreal, 30 October - 20 November 1990, ICAO Doc 9572, RGCSP/7.

As envisioned by the Review of the ICAO General Concept of Separation Panel (RGCSP), introduction of RVSM would be safe if:

• Collision risk due to all causes does not exceed 5 fatal accidents per 10⁹ flying hours, and, at the same time,
• Collision risk due to aircraft height-keeping systems does not exceed 2.5 fatal accidents per 10⁹ flying hours.

Western Pacific/South China Sea (WPAC/SCS)

Risk Estimates for the RVSM Operation in WPAC/SCS Airspace

Bay of Bengal (BOB)

Risk Estimates for the RVSM Operation in BOB Airspace