Assertion: zeppelin's crew | /r/HasProperty | found above 1,500 metres
Facets:
value: usually
type: TEMPORAL
value: beyond the airship's pressure altitude
type: LOCATION
Source sentences:
text: With three engines operating at a speed of 100.7 km/h (62.6 mph) and headwinds reported over the English Channel, the crew raised the airship in search of counter-trade winds usually found above 1,500 metres (4,900 ft), well beyond the airship's pressure altitude.