PHI - Position and Homing Indicator: Difference between revisions

===Programming the routes===

Programming The instrument allows you to sequentially follow up to 5 routes stored in the '' Station Selector '' (unit with the code NCU located to the right of the pilot). A route consists of two values: N-S and E-W coordinates measured in air miles of the next point <ref name = "AD091920"/>. The NCU allowed the insertion of a box containing 4 multiturn resistors (10 turns) to enter the distance N-S and other 4 multiturn resistors to enter the distance E-W. Once the route was planned, the navigator made a list of max. 5 pairs of coordinates, the first pair was not inserted into the device, but only communicated to the pilot, who set it on the display, the other 4 pairs were set by a technician using a special programming device and a screwdriver that turned the potentiometers placed on the programming box. The cassette could be inserted into the compartment with a light pressure and extracted using the ''release'' button <ref name="release">The ''release'' button in the G91R1B works, and then ejects/retracts the program cassette.</ref> dell NCU unit.<br>Programming The instrument allows sequentially follow up to 5 routes stored in the ''Station Selector'' (unit with the code NCU located to the right of the pilot). A route consists of two values: N-S and E-W coordinates measured in air miles of the next point <ref name = "AD091920"/>.<br>In the simulation, as will see later, the two coordinates have been replaced by a distance and an angle (heading), with respect to the geographic North. In this way it is possible to quickly integrate the polar coordinate programming method of the routes obtained from the route manager of the FGFS program with the N-S and E-W system used by the PHI.