31. Is your's'type pitot tube intended for a supersonic aircraft ? t ) " 23 : 03, 28 June 2010 ( UTC) 32. For supersonic flow, however, pitot pressure is the stagnation pressure of the flow behind the normal shock ahead of the pitot tube . 33. Immediately after takeoff, an instrument alarm prompts the captain in command to switch to the backup pitot tube as their primary indication. 34. Advances in the 18th century included the Bernoulli piezometer and Bernoulli's equation, by Daniel Bernoulli, and the Pitot tube , by Henri Pitot. 35. The airspeed is derived from the difference between the ram air pressure from the pitot tube , or stagnation pressure, and the static pressure. 36. There was a further tapping-off of pressure-ducted air from the pitot tube which also provided the rate of climb indicator with its source. 37. It determined that the disaster was likely due to the aircraft's pitot tubes being obstructed by ice crystals, causing the autopilot to disconnect. 38. It also blamed a Birgenair ground crew for failing to cover airspeed sensors known as pitot tubes while the plane was being serviced. 39. A pitot tube was distinctively moved from the tip of the nose to below the nose in the majority of Mirage 5 variants. 40. The NTSB report would later determine that the method used to clear the pitot tubes was an " . . . improper maintenance procedure"
