with the earlier GPWS, the terrain warning was issued only 13 seconds before the crash.

In 1998, the FAA issued Notice No. 98-11, Terrain Awareness and Warning System, proposing that all turbine-powered U.S.-registered airplanes type certificated to have six or more passenger seats (exclusive of pilot and copilot seating), be equipped with an FAA-approved terrain awareness and warning system.

On March 23, 2000, the FAA issued Amendments 91-263, 121-273, and 135-75 (Correction 135.154). These amendments amended the operating rules

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