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Ground proximity warning system: Difference between revisions
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Mode 6 (bank angle and altitude above field callouts) depends on a serviceable attitude reference, and ideally a valid decision height. <tt>/instrumentation/attitude-indicator/indicated-roll-deg</tt> is the key attitude property, which comes from either the attitude indicator (which is vacuum powered) or the master reference gyro (which is electrically powered). | Mode 6 (bank angle and altitude above field callouts) depends on a serviceable attitude reference, and ideally a valid decision height. <tt>/instrumentation/attitude-indicator/indicated-roll-deg</tt> is the key attitude property, which comes from either the attitude indicator (which is vacuum powered) or the master reference gyro (which is electrically powered). | ||
==Modes== | |||
;Mode 1 | |||
: Provides 'sink rate' and 'pull up' alerts based on descent rate at low radio altitudes (below 2500') | |||
;Mode 2 | |||
: Provides 'pull up' and 'terrain' callouts around rising terrain | |||
;Mode 3 | |||
: Provides alerts against altitude loss after takeoff (or a go-around). Losing altitude triggers a 'don't sink' alert. | |||
;Mode 4 | |||
: Provides alerts against insufficient clearance, based upon the aircraft configuration and flight phase (takeoff, cruise, approach). Alerts include 'too low terrain', 'too low gear' and 'too low flaps'. Also protects against a gear-up landing or approach without flaps in the landing configuration. | |||
;Mode 5 | |||
: Provides 'glideslope' alerts when deviating below a glideslope while established on a localizer. | |||
;Mode 6 | |||
: Provides callouts based on the specified decision-height and radio altitude. This includes a 'minimums' alert based upon the decision-height, and callouts while descending through various radio altitudes (1000', 500', 200', 100', 50', 40', 30', 20' and 10'). Also provides a 'bank angle' alert based upon excessive aircraft roll. | |||
==External links== | ==External links== | ||