102: Avionics/Electrical Fundamentals


Unit Specific

Avionics / Electrical  

203.1.1 state the purpose of the following communications equipment 

1.Intercommunications System (ICS)-AN/AIC-22, is installed to provide intercommunication functions for crewmembers. A pilot, co-pilot and TACCO operated public address (PA) system and radio- receiving facilities are provided for each crew station. In addition, radio-transmitting facilities are provided for the pilot, co-pilot, and TACCO, and NAV/COMM. Audio monitor circuit is provided for special purpose equipment. Twelve (12) headsets are provided: one for each crew station, the ordnance station, and the nose wheel well. 

2. Ultra High Frequency (UHF)-two identical ARC-143UHF transceivers are installed in the P-3C aircraft. These radios are functionally identical, however, they have different capabilities because of aircraft wiring differences between the NAV/COMM stations and the flight stations. The UHF-1 control box is mounted in the flight station. It can be utilized for plain voice, cipher voice (VINSON) and UHF-2 control box is mounted at the NAV/COMM station and is capable of plain voice, cipher voice, teletype, data link, sonobuoy command and IACS.

3. Very High Frequency (VHF)- the ARC-182 VHF/UHF radio system is installed in the aircraft incorporated AFC-485 to allow communication with civilian and military agencies in the VHF-AM and UHF bands, civilian maritime units in the high VHF-AM bands, and tactical military units in the low VHF-FM bands. The control panel is located in the flight station on the co-pilot side of the center control pedestal. The radio utilized for plain voice communication only. 

4. High Frequency (HF)-two ARC-161 HF receiver / Transmitters are installed in P-3C Aircraft. These identical radios are capable of transmitting in the range of 2 to 29.9999 MHz. Both HF control boxes are mounted at the NAV/COMM station. Operations of the two radio sets are independent of each other. However an interlock automatically grounds the unused radio when a mike is keyed on either HF. Both HF's are capable of plain voice, cipher voice, Teletype and data link. 

203.1.2 state the purpose of the following navigation equipment 

1. Inertial Navigation System (INS)-An automatic aid to navigation that is independent of outside references. An INS is a portion of the tactical system that provides accurate velocity, attitude, and heading data processing system. This overall system permits accurate weapons delivery. To function properly, the system must be aligned with reference to initial conditions of altitude, latitude, and longitude. The aircraft gyros, accelerometers, synchros, servos, and computers continually monitor aircraft heading, attitude, and horizontal and vertical velocities. Any change in the aircraft latitude, longitude, or altitude involves a change in its speed or direction of motion. The inertia's extremely sensitive accelerometer resists these changes. The computers continually recalculate the movement of the aircraft based on the latest changes recorded by the accelerometers. The computers use these calculations to provide a constantly updates readout of the aircraft's geographical position.  

2. Tactical Air Navigation (TACAN)-the navy uses TACAN as the primary navigation aid for carrier based aircraft. TACAN has integrated distance-measuring equipment (DME). The size of the system allows it to be based aboard ship and gyro-stabilized for pitch, roll, and yaw. 

3. Global Positioning System (GPS)- the AN/ANR-151 (V) GPS is a world wide, all weather positioning system that provides the NAV/COMM with a fixed position readout that is accurate to 5 to 8 meters when operated with proper AS/AS crypto installed. In addition to position information, the GPS provides a display of various navigational and tracking data. 

4. Automatic Direction Finder (ADF)-frequencies between 100 and 1750 KHz. 

203.1.3 State the purpose of the following tactical equipment





203.1.4 State the purpose of the following special mission equipment 


203.1.5 State the function of the following equipment 


EAWS Links

Washington and King's EAWS P-3 Specific PQS Tutorial
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For comments contact:

AZC(AW/NAC) Kimberly King

AT1(AW) Toni Washington