Controlled Flight into Terrain (CFIT) is an accident where the aircraft is flown into the ground while the aircraft is completely airworthy.

EGPWS integrates terrain situational awareness with respect to current airplane position and predicted trajectory with an advanced Ground Proximity Warning System.

EGPWS provides alert information to the flight crew both visually and aurally.

A terrain map database will be used, which provides EGPWS a means to estimate a flight-path or selected changes thereof for approaching high grounds.

It is also included along with the basic functionality, to alert pilots in advance, so that they have sufficient time to overcome hazardous situations.

For example situations like steep rise of terrainobstacle in the path of aircraft wont give sufficient time to crew to overcome.

In this paper all the required features that enable to generate proper alerts at proper time are implemented.

Egpws Terrain Database Code For The

The VHDL language is used to write code for the EGPWS functionality.

It is also designed to provide various defined colors on the display, which enable the crew to know terrain height variations in the surrounding area through which aircraft is moving.

Altitude loss after takeoff turbofan (jet) Altitude loss after takeoff turbofan Mode 2 Excessive Descent Rate Excessive descent rate, offering alerts and warnings for excessive descent with respect to altitude above ground level (AGL).This mode has an inner and outer warning boundary.

Penetration of the outer warning boundary activates the yellow GNDPROX display on the PFD and a minimum of 2 SINKRATE voice alerts.

Further penetration to the inner boundary leaves the red GNDPROX display on the PFD, but changes the message to PULL UP.

Mode 3 Flight into Rising Terrain Mode 3 provides alerts and warnings to help protect the aircraft from impacting the ground when rapidly rising terrain with respect to the aircraft is detected.

Mode 3 is based on radar altitude and on how rapidly radar altitude is decreasing (closure rate).

Mode 3A Mode 3A is active during climb out, cruise and initial approach (Flaps not in landing configuration and aircraft not on glide slope centerline).

If the aircraft penetrates the Mode 3A alerting envelope, the message TERRAIN, TERRAIN is generated and the GND PROX display on the PFD comes on.

If the aircraft continues to penetrate the envelope, the warning message PULL UP is repeated continuously until the warning envelope is exited.

In addition, the visual alert will remain on until the aircraft has gained 300 ft of barometric altitude, 45 seconds has elapsed or the flap override switch is activated.

Mode 3B Mode 3B is selected with flaps in landing configuration or when making an ILS approach with Glide slope deviation more than 2 dots.

Warnings for Mode 3B activate the GND PROX display on the PFD and the continuous aural message TERRAIN until the terrain closure rate falls below warning levels.

Excessive Descent Rate Excessive Descent Rate Turbofan (jet) MODE 3: Terrain Clousure Rate 4 Terrain Closure Rate Figures - uploaded by Anilkumar Veerapaneni Author content All figure content in this area was uploaded by Anilkumar Veerapaneni Content may be subject to copyright.

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