The amendment was triggered by a series of events in 1995 involving the Boeing 777 twinjet, the first of which occurred on 2 February, when a test aircraft suffered a sudden cabin-depressurisation during a rapid descent from 43,000ft (13,100m) during a flight test. The failure, traced to a fault in a check valve in the air conditioning system, led to the injury of four flight-test engineers. The same problem cropped up later the same day on another test aircraft operating from Hawaii. A less severe repetition of the event occurred in June 1995 when the demonstration 777 returning from the Paris air show to Seattle with US Transportation Secretary Frederico Pena and ministers from several Asian countries suffered a pressurisation failure.
Source: Flight International
