Aviation Electronics Technician 1 - Historic Naval Ships Association

the mode of operation, indicates ground speed anddrift angle, and indicates when the system is in thesearch mode.The signal representing drift angle from theantenna is fed to the servo follow-up in the indicatorand positions the DRIFT angle dial to the correct driftangle. The RT develops a voltage proportional to thefrequency of the frequency generator, which is thenfed to a servomotor in the indicator. This servomotorpositions the GND SPEED dial to indicate the groundspeed. The mode switch should be set to the LANDposition when the aircraft is overland, and to the SEAposition when over the sea.With the mode switch in the TEST position, youshould get the following indications after a 1-minutedelay:lllMEMORY light is off.GND SPEED dial indicates 121±5 knots.DRIFT angle dial indicates 0±2°.The memory light indicates that the audio fromboth radiated patterns is lost. This means that thesystem cannot provide accurate information. The twoindicators will be locked at the present readings untilthe RT starts to receive good signals.REVIEW QUESTIONSFigure 2-16.-AN/APN-153(V) components.APN-153(V). B. AS-1350/APN-153(V).APN-153(V).A. RT-680A/C. C-4418A/Q1.Q2.Q3.Q4.Q5.Q6.Q7.Q8.Q9.Q10.Q11.What is the definition of direction?What is the difference in miles between thehighest and lowest points of the earth's crust ?What are the imaginary reference lines usedto locate points on the earth called?What is the definition of absolute altitude?In the counter-pointer display, how manyrevolutions does the pointer make per 1,000feet of altitude?What is the reliable altitude range for theAN/APN-194(V) radar altimeter?How is the barometric switch in the RAWSsystem reset prior to flight?What are the operating modes of the ADFsystem?What TACAN operating mode ensures thatradio silence is maintained?What are the three operating frequencies usedin the omega system?What are the two pieces of data informationprovided by the AN/APN-153(V) Dopplersystem?2-19