AMSADD Profile Vs EGPWS and GPWS

The graph below depicts the primary difference AMSADD and EGPWS/GPWS or MINSAW. AMSADD is the only system that addresses the concept of minimum safe altitude. The other systems allow the pilot to descend past the minimum safe altitude and give a warning only when the aircraft is in a situation that it may not be able to recover.
AMSADD never allows the pilot to descend below the MSA unless it is safe to do so. There are some air traffic control situations in which the aircraft may be directed to descend below the MSA. In this case, the pilot will be aware that the aircraft is below the standard safety limits, which will encourage an even stronger vigil of the altitude awareness.

Comparison of the AMSADD Terrain Awareness System
vs.
Other Ground Proximity Warning Systems

  Comparison Chart

 AMSADD  

All Others

Clearly indicates actual MSA of aircraft's present position.

yes

no

Clearly indicates approaching higher MSA with a two minute notice.

yes

no

Indicates man made structures such as towers, stacks, ect.

yes

no

Constantly shows altitude to descend in case of rapid descent.

yes

no

Requires glass cockpit or map display.

no

yes

Monitors altitude on ILS, VOR, ADF or GPS approach.

yes

no

Totally independent of other on board systems.

yes

no

Continues to operate with aircraft electrical failure.

yes

no

Cost per aircraft...........................................................

$200

$200,000

 

History of Ground Proximity Warning Displays Psychology of Colors
 Flight Tests Evolution of AMSADD

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