More than 30 years ago, the FAA began allowing simultaneous operations on intersecting runways (SOIR) at certain U.S. airports under certain conditions. SOIR required a landing aircraft to stop before reaching an intersecting runway. In 1997, the concept was expanded to include hold short points before intersecting taxiways and at other points on the landing runway, under the designation of land and hold short operations (LAHSO). SOIR/LAHSO evolved from the observation that some landings did not require the full runway length and that this fact could be exploited to increase airport acceptance rates. Airports have been able to increase capacity without the need to physically expand the airport operating area. The objective of the analysis reported here is to answer several fundamental safety questions regarding land and hold short operations: What are the hazards associated with this operation; What are the existing controls for this procedure; Given the hazards and controls, what are the residual risks associated with this procedure; How can residual risks be reduced. It is also important to emphasize what this risk assessment does not do: This assessment does not judge the acceptability of LAHSO risks. This assessment does not reconcile differences in risk perceptions among participants.


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