AVIONICS FLIGHT CHECKS (CONT)
TACAN distance measuring equipment - Check
against known distances (on the ground if
possible) using known checkpoints. Verify that
TACAN distance accuracy is within 2% of known
Transponder set - Check as follows:
MASTER control - STBY (allow 2 minute warm
MASTER control - NORM.
Mode switches - Set test mode.
Code selectors - Set test code.
Fly aircraft within line of sight of interrogating
Contact the facility by radio and request that the
aircraft be interrogated and that the reply be
checked for satisfactory response.
Encoding altimeter - Check as follows:
Mode C switch (transponder control panel) - ON.
Contact ground radar facility and request facility
altitude readout. Observe that ground facility
altitude readout agrees with aircraft altitude
within 200 feet.
Radar set - Check while airborne as follows:
RADAR system mode selector switch - OFF.
Radar receiver GAIN control - Preset (pushed in)