The US National Transportation Safety Board (NTSB) is urging the Federal Aviation Administration to accelerate the schedule for installation of enhanced ground proximity warning systems (EGPWS) in all turbine-powered aircraft with six or more seats.

The NTSB wants aircraft not required to be equipped with GPWS to be fitted with EGPWS within three years, instead of the four-year installation timeframe called for in the FAA's notice of proposed rulemaking (NPRM), which was published last August.

The NTSB recommendation follows the publication of the report on a Learjet 25B controlled flight into terrain accident at Houston, Texas, in January last year. The aircraft crashed into trees on an instrument landing system (ILS) final approach following an ILS indicator malfunction.

Source: Flight International