The Avionics Technician Handbook- Volume One was written by technicians for technicians to be the Handbook for the line maintenance technician to have in the field. This book provides information about those avionics systems that provide the interface between the pilot and the aircraft systems and the concepts on use of typical avionics test equipment. These two volumes are design to prepare technicians for the NCATT Add On ratings for Radio Communications Systems, On board Safety Systems, Dependent Navigation System and Autonomous Navigation Systems. These books are also created to teach real system testing and troubleshooting of avionics systems. These systems include: Principles of test equipment calibration, General Aviation Cockpit Orientations, Operations of and troubleshooting with a basic multimeter, testing with an Oscilloscope, Using a Megohmeter or Insulation tester, Testing with a TDR, Performing an aircraft Compass system swing, test and calibrate an aircraft fuel quantity system, performing a test of an aircrafts Pitot/Static System, Operation and testing of aircraft engine indication systems. This book is a must have for those pilots wishing to understand the operation of the avionic systems in most GA and Air Carrier aircraft. Pilots today need to have a better understanding of the systems to work with the technicians when troubleshooting problems.