Runway Awareness and Advisory System (RAAS) Sometimes referred to as “SMART LANDING FEATURE”. The RAAS is an option on the Boeing 737NG to the EGPWS, which specifies alerts or notifications regarding your position, and a runway position. It is highly SA improving, preventing runway incursions by visually (on the ND) and verbal warnings, if an incorrect aircraft position versus runway exists. The system uses the aircrafts GPS position in conjunction with EGPWS stored airport and runway data which are compared, where after an alert is passed onto the cockpit systems. When RAAS is enabled the system operates without any action of the crew. The callouts can be stopped by selection of the Runway Inhibit Switch on the EGPWS control panel indicated by the RUNWAY INOP light. The light also illuminates when input data (GPS, Airport data) to the RAAS operation is incorrect or not available. ROUTINE ADVISORIES 1. Approaching Runway provides in-the-air awareness of which runway the aircraft is lined up with on approach. 2. Approaching Runway provides on-the-ground awareness of approximate runway edge being approached by the aircraft during taxi operations. 3. On Runway provides awareness of which runway the aircraft is lined-up with. 4. Distance Remaining provides awareness of aircraft along-track position relative to the runway end. NON-ROUTINE ADVISORIES 1. Runway End improves awareness of the aircraft position relative to the runway end during low visibility conditions. 2. Approaching Short Runway provides in-the-air awareness of which runway the aircraft is lined-up with, and that the runway length available may be marginal for normal landing operations. 3. Insufficient Runway Length provides on-the- ground awareness of which runway the aircraft is lined-up with, and that the runway length available for takeoff is less than the defined minimum takeoff runway length. 4. Extended Holding on Runway advisory provides crew awareness of an extended holding period on the runway. 5. Taxiway Take-Off provides awareness of excessive taxi speeds or an inadvertent take-off on a taxiway. 6. Rejected Takeoff / Distance Remaining provides position awareness during a Rejected Take Off (RTO). 7. Taxiway Landing provides awareness that the aircraft is not lined up with a runway at low altitudes.
Posted on: Sat, 25 Jan 2014 10:54:44 +0000
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