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9/27/01 AC 43.13-1B CHG 1 (VHF) navigation and communications sys tems. This system has an automatic test equipment (ATE). NOTE: Aircraft must be outside of hangar for LORAN to operate. Normally self test check units, verification of position, and loading of flight plan will verify operation verification of proper flight manual supplements and operating handbooks on board, and proper software status can also be verified. 12-17. GLOBAL POSITIONING SYSTEM (GPS). The GPS is at the forefront of present generation navigation systems. This space-based navigation system is based on a 24-satellite system and is highly accurate (within 100 meters) for establishing position. The system is unaffected by weather and pro vides a world-wide common grid reference system. Database updating and antenna main tenance are of primary concern to the GPS user. NOTE: Aircraft must be outside of hangar for ground test of GPS. 12-18. AUTOPILOT SYSTEMS. Auto matic Flight Control Systems (AFCS) are the most efficient managers of aircraft perform ance and control. There are three kinds of autopilot; two axes, three axes, and three axes with coupled approach capability. Attention must be given to the disconnect switch opera tion, aural and visual alerts of automatic and intentional autopilot disconnects, override forces and mode annunciation, servo opera tion, rigging and bridle cable tension, and con dition. In all cases the manufacturer’s inspec tion and maintenance instructions must be followed. 12-19. ALTIMETERS. Aircraft conducting operations in controlled airspace under instru ment flight rule (IFR) are required to have their static system(s) and each altimeter in strument inspected and tested within the previ ous 24 calendar months. Frequent functional checks of all altimeters and automatic pressure altitude reporting systems are recommended. a. The tests required must be performed by: (1) The manufacturer of the aircraft on which the tests and inspection are to be per formed. (2) A certificated repair station properly equipped to perform those functions and holding: (a) An instrument rating Class I. (b) A limited instrument rating ap propriate to the make and model of appliance to be tested. (c) A certified/qualified mechanic with an airframe rating(static system tests and inspections only). Any adjustments shall be accomplished only by an instrument shop cer tified/qualified person using proper test equipment and adequate reference to the manufacturer’s maintenance manuals. The altimeter correlation adjustment shall not be adjusted in the field. Changing this adjustment will nullify the correspondence between the basic test equipment calibration standards and the altimeter. It will also nullify correspon dence between the encoding altimeter and its encoding digitizer or the associated blind en coder. b. Examine the altimeter face for evi dence of needle scrapes or other damage. Check smoothness of operation, with particu lar attention to altimeter performance during decent. c. Contact an appropriate air traffic fa- cility for the pressure altitude displayed to the controller from your aircraft. Correct the re ported altitude as needed, and compare to the Par 12-16 Page 12-7PDF Image | AFS-640
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