41. 4 : 43 . 49-- Co-pilot : " The airspeed indicator " ( sound of switch, end of ringing ). 42. The latest crash report says the Turkish pilots knew before they left the ground that the airspeed indicator had problems. 43. Indicated airspeed ( IAS ) is the airspeed indicator reading ( ASIR ) uncorrected for instrument, position, and other errors. 44. An airspeed indicator is a differential pressure gauge with the pressure reading expressed in units of speed, rather than pressure. 45. Some officials have speculated that a blocked sensor may have been responsible for the pilot's airspeed indicator giving incorrect readings. 46. Aviation officials have mentioned that the pilots knew before takeoff of the malfunctioning airspeed indicator but chose to takeoff anyway. 47. Unable to read the airspeed indicator , altimeter and other crucial readings, the two pilots begin arguing about what to do. 48. Visual flight rules ( VFR ) require an airspeed indicator , an altimeter, and a compass or other suitable magnetic direction indicator. 49. Some officials have speculated that a blocked pitot tube may have been responsible for the pilot's airspeed indicator giving incorrect readings. 50. The Dominican report absolved Dominican air traffic controllers and said the aircraft had no other mechanical defects beyond the airspeed indicator .
