minimum safe altitude warning

Also found in: Acronyms.

minimum safe altitude warning (MSAW)

A function of the ARTS (automated radar terminal system) III computer that aids the controller by alerting him or her when a tracked mode C-equipped aircraft is below, or is predicted to go below, a predetermined safe altitude. See also automated radar terminal system.
References in periodicals archive ?
The asterisk indicates that the Minimum Safe Altitude Warning system is turned off for that aircraft, so he can fly as low as he wants without triggering MSAW altitude alarms.

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