Comments on: 1 May 1947 https://www.thisdayinaviation.com/1-may-1947/ Important Dates in Aviation History Wed, 30 Apr 2025 14:05:51 +0000 hourly 1 By: James https://www.thisdayinaviation.com/1-may-1947/#comment-39374 Wed, 01 May 2024 22:08:36 +0000 https://www.thisdayinaviation.com/?p=83106#comment-39374 This is a very early version of a GPWS. Any idea why it was not on all airliners prior to the actual modern GPWS? Ironically, it was a crash of a TWA airliner, Flight 514, flying into Washington Dulles Airport back in 1974 that mandated putting a GPWS in all airliners. That flight struck some low mountains west of the airport. This radar system would have saved them. Anyone know why this simple system Hughes invented wasn’t used by all airliners since the Connie days?

]]> By: James https://www.thisdayinaviation.com/1-may-1947/#comment-39373 Wed, 01 May 2024 21:54:03 +0000 https://www.thisdayinaviation.com/?p=83106#comment-39373 In reply to Will E..

No. TCAS is Traffic Collision Avoidance System. It’s designed to prevent mid-air collisions. This would be more like an early version of GPWS – Ground Proximity Warning System.

]]> By: Will E. https://www.thisdayinaviation.com/1-may-1947/#comment-39359 Wed, 01 May 2024 12:17:48 +0000 https://www.thisdayinaviation.com/?p=83106#comment-39359 Was this system the grandfather of the more modern TCAS system? Terrain Collision Avoidance System?

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