![]() Use the screw at the bottom to set your airspeed using the scale along the handle. ![]() The front face of the gadget allows input of the aircraft heading, airspeed (through the air), plus the windspeed and the wind direction. This is manual, analogue, computer that adds the effect of the wind to the aircraft speed to tell you what direction is will be going and what speed, assuming the weather forecast is correct.Īlternatively if you can note what you have flown over and determine your track bearing from a map then you can work out the wind speed and its direction, as it has been affecting you. This isĪ navigational aid, primarily to help the pilot allow for wind strength and direction. There are similar devices for student pilots, see Wikipedia:įlight computer for a typical example flight computer. The old Japanese model I have, is illustrated below: This page is about a hand held Japanese aircraft slide rule flight navigation computer as used during the second world war by a Japanese pilot in Singapore. The Investigation found that a fault within the phase locked loop (PLL) circuitry of the ADC had resulted in sudden and erroneous airspeed and altitude indications on the Captain’s instruments.Views of the earth from geostationary orbitĮxplanation of antenna feed polarisation angleĭesign and draw your own satellite beam coverage The resultant stall warning was followed by a recovery. The altimeter increase triggered an overspeed warning and the Captain reduced thrust and commenced a climb. B763, en-route North Bay Canada, 2009 - On 19 June 2009 a Boeing 767-300 was level at F元30 in night IMC when the Captain’s altimeter and air speed indicator readings suddenly increased, the latter by 44 knots.A “MAYDAY” was declared and the aircraft returned to Accra without further event. The commander, uncertain as to what was failing, disengaged the automatics and lowered the aircraft’s nose, then handed over control to the co-pilot. Passing F元16, the VNAV mode became active and the Flight Management Computers (FMCs), which use the left ADC as their input of aircraft speed, sensed an overspeed condition and provided a pitch-up command to slow the aircraft. After passing FL180 the crew selected the left Air Data switch to ALTN, believing this isolated the left Air Data Computer (ADC) from the Autopilot & Flight Director System (AFDS). He decided to continue the takeoff and deal with the problem whilst airborne. B752, en-route, Northern Ghana, 2009 - On 28 January 2009 the commander of a Boeing 757-200 became aware of a the failure of his ASI early in the night takeoff roll on a scheduled passenger flight.Some, like the Enhanced Software Configurable Air Data Unit (ESCADU) are software configurable to suit many different aircraft applications. These devices are usually autonomous and do not require pilot input, merely sending continuously updated data to the recipient systems while the aircraft is powered up. ![]() The data provided may be true airspeed, pressure altitude, density altitude and OAT, but with no involvement in aircraft attitude or heading, as there are no gyroscopes or accelerometers fitted internally. Output interfaces typically are ARINC 429, Gillham or even IEEE1394 (Firewire). As on simpler aircraft without a fly by wire system, the outputs are typically to the cockpit altimeters or display system, flight data recorder and autopilot system. They commonly have the pitot and static pressure inputs, as well as outside air temperature (OAT) from a platinum resistance thermometer and may control heating of the pitot tube and static vent to prevent blockage due to ice. In simpler aircraft including helicopters the air data computers, generally two in number, and smaller, lighter and simpler than an ADIRU, may be called Air Data Units, although their internal computational power is still significant. This has now been replaced by the Global Navigation Air Data Inertial Reference System (GNADIRS). In Airbus aircraft the air data computer is combined with altitude, heading and navigation sources in a single unit known as the Air Data Inertial Reference Unit (ADIRU). This enables computation of static air temperature and true airspeed. In some very high speed aircraft equivalent airspeed is calculated instead of calibrated airspeed.Īir data computers usually also have an input of total air temperature. ![]() This computer, rather than individual instruments, can determine the calibrated airspeed, Mach number, altitude, and altitude trend data from an aircraft's Pitot Static System. An air data computer (ADC) is an essential avionics component found in aircraft.
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