31. At higher altitudes when additional boost was required, a hydraulic clutch would engage the second supercharger, adding to the service ceiling . 32. The aircraft had a service ceiling of but was unpressurized so was limited to an operational ceiling of by USAF regulations. 33. The " Fun " wing is covered in Trilam sailcloth and allows a maximum speed of and a service ceiling of 34. Earlier publication cited even more impressive expected performance of service ceiling of 60 km and speed of 15 . . 30M 35. ACTS bombing proponents began calling for higher service ceilings for their bombers : for light bombers and for the heavy bombers. 36. The world s first commercial jet airliner was the British de Havilland Comet ( 1949 ) designed with a service ceiling of. 37. While some APUs may not be startable in flight, ETOPS-compliant APUs must be flight-startable at altitudes up to the aircraft service ceiling . 38. These aircraft had a relatively limited service ceiling , and was limited to attacks at short-range where they maintained line-of-sight to the UK. 39. The Heron can touch speeds of over 100 knots with a service ceiling of 30, 000 feet and an endurance of 40 hours. 40. The service ceiling is listed as 36 km in the Specifications section .-- talk ) 06 : 35, 6 July 2013 ( UTC)
