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The Lockheed P-2 Neptune (designated P2V by the United States Navy prior to September 1962) is a maritime patrol and anti-submarine warfare (ASW) aircraft. It was developed for the US Navy by Lockheed to replace the Lockheed PV-1 Ventura and PV-2 Harpoon , and was replaced in turn by the Lockheed P-3 Orion .
The transponder gets its altitude information from an encoding altimeter mounted behind the instrument panel that communicates via the Gillham code. Gillham code is a zero-padded 12-bit binary code using a parallel nine- [ 1 ] to eleven-wire interface , [ 2 ] the Gillham interface , that is used to transmit uncorrected barometric altitude ...
An air data computer (ADC) or central air data computer (CADC) computes altitude, vertical speed, air speed, and Mach number from pressure and temperature inputs. [1] It is an essential avionics component found in modern aircraft.
[2] [4] H is the elevation difference between the lens and the sea level, which is the average level of the water surface. [2] [4] h is the elevation difference between the terrain surface and the sea level. [2] [4] S is the scale of aerial photographs. [2] [4] = is the formula for scale measurement.
Of the 44, Neptune formerly operated 6 P2V Neptune airtankers. Since its inception, Neptune has been successful in acquiring and reacquiring airtanker contracts with the US Forest Service. Neptune was the first- ever US operator to contract with the USFS in 2011 for a Next Gen aircraft in the form of Tanker 40, a converted British Aerospace 146.
It is designed to read zero at sea level in the vicinity of the aerodrome, unlike QNH which will not read precisely zero at sea-level. [2] Related to the altimeter settings are: TA [3] - Transition Altitude - altitude at which the pilot changes the aircraft's altimeter setting (usually from QNH) to standard pressure (1013.25 hPa)
February 23, 2008 – A B-2 bomber took off from Andersen Air Force Base in Guam and subsequently crashed after stalling. It was caused by moisture on the air-speed sensors. [11] 1 June 2009 – The French air safety authority BEA said that pitot tube icing was a contributing factor in the crash of Air France Flight 447. [12]
An ISIS is designed to combine the functions of separate equivalent mechanical instruments that had previously been included as backup in such cockpits, including altimeter, airspeed indicator, and attitude indicator. Various aspects of ISIS are defined by its function of being a backup to conventional instrumentation.