Assertion: carrier's aircraft | /r/CapableOf | descend at 250 knots
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text: Aircraft descend at 250 knots (460 km/h; 290 mph) and 4,000 feet per minute (1,200 m/min) until an elevation of 5,000 feet (1,500 m) is reached, when the descent is lessened to 2,000 feet per minute (610 m/min).