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27 Cards in this Set
- Front
- Back
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106.1 Define OHM’s law
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I=E/R
(1) I = Current - measured in amps (2) E = Voltage (3) R = Resistance - measured in ohms |
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106.1 Define Thermocouple
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A probe made with two dissimilar metals, such as iron and copper. When heat is applied to the junction of these metals, a measurable voltage is generated. This voltage is used to determine temperature.
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106.1 Define Frequency
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The speed of oscillation/cycles per second measured in Hertz.
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106.2 Describe alternating current (AC) and direct current (DC).
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a. Alternating current (AC) polarity switches/oscillates between positive and negative.
b. Direct current (DC) polarity stays constant; no oscillation. |
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106.3 State the output of the SH-60F/HH-60H aircraft generator in reference to the following parameters:
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a. Voltage - 115/200 volts AC
b. Phase - 3 phase c. Frequency - 400 Hz |
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106.4 State the purpose and location of the aircraft battery.
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The purpose of the aircraft battery is to provide a primary source of power for APU starting. The aircraft battery is location in the co-pilot’s seat well. Normal battery life is 22 minutes day-time and 14 minutes night-time.
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106.5 State the difference between the following types of tests:
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a. Continuity - testing a wire from end to end for resistance to ensure the wire is not broken, shorted or has high resistance.
b. Voltage - is measured in volts ac or dc, depending on the power source. |
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106.6 Discuss the purpose of the following test equipment:
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a. Digital multimeter - used to test electrical systems for voltage, resistance (ohms) and milliamperage.
b. Time Domain Reflector - test primarily coaxial cable for opens/shorts and measure the length of the cable to the failure. It can also print out results on paper. |
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106.7 Briefly describe the Pitot Static System.
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The pitot is ram air directly in front of that aircraft. Static is pressure in the atmosphere around the aircraft due to barometric pressure.
These two pressures are used to control the barometric altimeters: airspeed indicators, Digital Automatic Flight Control System (DAFCS), vertical velocity indicators and stabilator system. |
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106.8 State the difference between the barometric and radar altimeter.
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The barometric altimeter uses barometric pressure to sense altitude; 1,000 to 50,000 feet. The radar altimeter provides continuous measurement of height above land or water using radar echoes; indicates 0 to 1,000 feet.
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106.9 Explain the basic principles of the doppler effect.
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The doppler effect is a ground speed sensor which transmits four narrow beams to the earth’s surface measuring the doppler shift of the return signal due to aircraft motion. From this, the heading, drift and vertical aircraft velocity is measured.
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106.10 Explain the operating characteristics of the Emergency Locator Transmitter (ELT).
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Transmits a distress signal on international distress frequency of 121.5 MHz and 243.0 MHz. Will travel 100 miles at an altitude of 10,000 ft. Will automatically activate on impact force of 5g’s. Tone varies from 1600 Hz to 300 Hz 2 to 3 times per second.
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106.11 Define the acronym - TDP
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Tactical Data Processor
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106.11 Define the acronym - CDU
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Control Display Unit
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106.11 Define the acronym - DCP
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Display Control Panel
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106.11 Define the acronym - MFD
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Multi-Function Display
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106.11 Define the acronym - HUD
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Heads Up Display
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106.11 Define the acronym - CSC
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Communication System Controller
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106.11 Define the acronym - DALS
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Downed Aircraft Locator System
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106.11 Define the acronym - IFF
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Identification, Friend or Foe
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106.11 Define the acronym - DAFCS
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Digital Automatic Flight Control Systems
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106.11 Define the acronym - HSVD
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Horizontal Situation Video Display
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106.11 Define the acronym - HF
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High Frequency; 3-30 MHz
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106.11 Define the acronym - UHF
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Ultra High Frequency
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106.11 Define the acronym - VHF
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Very High Frequency
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106.11 Define the acronym - ARI
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Azimuth Range Indicator
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106.12 Define the following terms as applied to sonar:
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a. Active - Obtains bearing, range, and doppler information by pinging and receiving target echoes.
b. Passive - Sonar does not transmit. Information about target is obtained by evaluation of sound generated by the object. c. Azimuth - An arc of the horizon measured between a fixed point (as true North) and the vertical circle passing through the center of an object, clockwise from the North Point through 360 degrees. d. Bearing - The direction an object is moving. e. Range - The horizontal distance between a weapon and a target. |
