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Circuit, Component, Wire, Cable, and Harness Designations

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Circuit, Component, Wire, Cable, and Harness Designations BHT-ELEC-SPM CHAPTER 3 — CIRCUIT, COMPONENT, WIRE, CABLE, AND HARNESS DESIGNATIONS TABLE OF CONTENTS Paragraph Chapter/Section Page Number Title Number Number CIRCUIT, COMPONENT, WIRE, AND CABLE HARNESS DESIGNATIONS 3-1 General Information................................................................... 3-00-00 3 3-2 Wiring Identification Code.......................................................... 3-00-00 3 3-3 Wiring Harness and Cable Designation..................................... 3-00-00 3 3-4 Component Symbols ................................................................. 3-00-00 5 3-5 Electrical Components and Assemblies — Reference Designator Assignment............................................ 3-00-00 17 3-6 Resistor Characteristic Codes ................................................... 3-00-00 24 FIGURES Figure Page Number Title Number 3-1 Wire Identification Code ................................................................................. 4 3-2 Circuit Identification ........................................................................................ 6 3-3 Component Symbols — Typical ..................................................................... 7 3-4 Reference Designator..................................................................................... 23 3-5 Typical Film Resistor Color Codes ................................................................. 26 TABLES Table Page Number Title Number 3-1 Circuit Functions............................................................................................. 5 3-2 Reference Designator — System Number and Description (Typical)............. 17 3-3 Reference Designator — Unit Number and Item Number Letter Codes (Typical).......................................................................................................... 21 3-4 Electrical and Electronic Components, Reference Designator/Description/Location — Reference Table (Examples) ................. 22 3-5 Film Type Resistor Color Codes .................................................................... 24 3-6 RE Type Resistance Code ............................................................................. 27 3-7 RER Type Resistance Code........................................................................... 28 3-8 RWR Type Resistance Code.......................................................................... 29 3-00-00 ECCN EAR99 27 MAY 2011 Rev. 1 Page 1/2 BHT-ELEC-SPM CIRCUIT, COMPONENT, WIRE, CABLE, AND HARNESS DESIGNATIONS 3-1. GENERAL INFORMATION side system and system number 2 to designate the same equipment for the pilot or right side system. This chapter includes information necessary to understand the identification of the wires, cables, NOTE harnesses, components, and circuits. Each wire, cable, and cable harness is physically marked for Some customizing installations may use identification on wiring diagrams and schematics. additional codes not listed in Table 3-1. Wiring diagrams and schematics also use symbols to identify the type of electrical components within a 2. The next designation is the wire number for a system or circuit. particular circuit. This number identifies the complete wire run between two components. Typically, it is Each electrical component has a reference designator power from a source or bus to the controlling consisting of a system number, unit number, and an component or a wire from the controlling component to item number, when applicable, for identification on an actuator, motor, or indicator (Figure 3-2). schematics and wiring diagrams. 3. Each segment of a wire number is marked Resistors are employed in some circuits for voltage starting with the letter A at the power or control source. reduction and/or biasing. Information to identify the Each time that wire number is interrupted by a terminal value, tolerance, and method of attachment is also board, connector, etc., the wire segment letter is provided. advanced to the next letter in alphabetical sequence (Figure 3-2). 3-2. WIRING IDENTIFICATION CODE 4. Wire size number denotes the wire size to American Wire Gauge (AWG) standards. NOTE It is not necessary to mark wires and cables 5. Ground letter notation (N) designates a wire as that are shorter than 6 inches (15.2 cm) in part of a ground circuit. length. 3-3. WIRING HARNESS AND CABLE Each wire is stamped with a coded designation DESIGNATION approximately 10 inches (25.4 cm) apart along the entire length (Figure 3-1). The code identifies the Wiring harness and cable assembly identification is circuit function, wire number of that circuit, the marked by part number on a white teflon sleeve or segment of a specific wire number, wire size, and if marking label placed within 3 inches (7.6 cm) of the applicable, ground. terminating connector (Figure 3-2). 1. In most cases, the circuit function is the first letter On some helicopters, each harness is also assigned a or letters in the code. Refer to Table 3-1 for circuit unique wire harness identification code. This identification. In the event there are two or more alphanumeric code starts with a W. The wire harness identical items or equipment installed on the same W-code (e.g., W5A) can be found on the harness helicopter, a system or unit number is used as a prefix identification label (Figure 3-2). The harness to the circuit function letter. For example, system identification is installed every 36 to 48 inches (914 to number 1 can be used to designate the copilot or left 1219 mm) along the harness. 3-00-00 ECCN EAR99 27 MAY 2011 Rev. 1 Page 3 BHT-ELEC-SPM L 18 A 20 N GROUND LETTER WIRE SIZE NUMBER WIRE SEGMENT LETTER WIRE NUMBER CIRCUIT FUNCTION LETTER 2AUD37A20N GROUND LETTER WIRE SIZE NUMBER WIRE SEGMENT LETTER WIRE NUMBER CIRCUIT FUNCTION LETTER SYSTEM (UNIT) NUMBER ELEC-SPM_ch03_0001 Figure 3-1. Wire Identification Code 3-00-00 Page 4 Rev. 1 27 MAY 2011 ECCN EAR99 BHT-ELEC-SPM Table 3-1. Circuit Functions Table 3-1. Circuit Functions (Cont) CODE NOMENCLATURE CODE NOMENCLATURE ADF Automatic Direction Finder Q Fuel and Oil ALT or Radio (Radar) Altimeter R Radio (navigation and communication) ALTM RD Direction Finder ARC UHF Communication RF VHF Liaison ATC Air Traffic Control RL HF Communication AUD Interphone RM Marker Beacon C Control Surfaces RN Navigation COMM Communication RU UHF Command D Instruments (other than flight or engine) RV VHF Command DME Distance Measuring Equipment RZ Interphone and Headphone E Engine Instruments S Radar F Flight Instruments SX IFF Transponder FL Electrical Filter T Special Electronics G Landing Gear TCS Traffic Collision and Avoidance System GPS Global Positioning System V DC Power and DC Control Cables for GYRO Gyromagnetic Compass AC System H Heating, Ventilating, and De-icing VHF VHF Communication J Ignition W Warning and Emergency K Engine Control X AC Power LLighting XPDR Transponder M Miscellaneous Electric MKR or Marker Beacon MB 3-4. COMPONENT SYMBOLS N Ground Components are identified on schematics and wiring NAV Navigation diagrams by symbols illustrated in Figure 3-3. These symbols are typical. Refer to the wiring diagram P DC Power chapter in the Maintenance Manual for model specific symbols. 3-00-00 ECCN EAR99 27 MAY 2011 Rev. 1 Page 5 BHT-ELEC-SPM CIRCUIT FUNCTION WIRE NUMBER WIRE SEGMENT LETTER WIRE SIZE REFERENCE DESIGNATOR COMPONENT SYMBOL FWD CB PANEL LH AVIONIC BLOWER LCTN - PEDESTAL LH LCTN - PEDESTAL 3940A1 2150B1 2150B1P1 AVIONIC BLOWER H014A24 3 FAULT SIGNAL 3940A1J1 3940A1P1 2150CB1 4 HEATER M 28 VDC ESS 1 2 A H004A22 F H004B22 WHT 1 28 VDC BUS H004B22 BLU 2 GROUND H017A22N CHASSIS GND 1 2150GC1 429-079-101-XXX CABLE ASSEMBLY H018A22N DC GND 1 2150GD3 GROUND DESIGNATION HARNESS IDENTIFICATION LABEL 1 CONNECTOR WIRING ASSEMBLY IDENTIFICATION (2150B1P1) EXAMPLE (AVIONIC BLOWER) HARNESS IDENTIFICATION LABEL HARNESS IDENTIFICATION 2150B1P1 CODE (W101) AVIONIC BLOWER 3.0 IN. (7.6 cm) OR 2150B1P1 CABLE ASSEMBLY (429-079-101) AVIONIC BLOWER NOTE W101 429-079-101 1 A white shrink sleeve tubing positioned every 36 to 48 inches (91.4 to 121.9 cm) along the harness may also be utilized. ELEC-SPM_ch03_0002 Figure 3-2. Circuit Identification 3-00-00 Page 6 Rev. 1 27 MAY 2011 ECCN EAR99 BHT-ELEC-SPM ANTENNAS LH HALF RH HALF DME, UHF/VHF AND ADF LOOP VHF AMVOR TRANSPONDER TRANSPONDER MARKER BEACON SENSE FM COMM (WHIP) HOMING RADAR ALTIMETER LOOP ADF SENSE ANTENNAS (TYPICAL) COUPLER CONNECTORS A1 F1 BUSSED A F 1 MA MB POSITIONS B G B1 G1 MC MD C H COAX 2 ME MF D J C1 H1 MG MH E K 3 MODULE STUD TYPE GROUND MODULE RESISTOR MODULE HF TERMINAL BOARDS AND BLOCKS A A F B PERMANENT B G C SPLICE TERMINAL CONNECT C H 1J3 1P3 D J J = JACK (RECEPTACLE) EK P = PLUG (CONNECTOR) 1 2 RECEPTACLE QUICK IN LINE CONNECTOR TERMINAL JUNCTION AND PLUG DISCONNECT (TYPICAL) ELEC-SPM_ch03_0003a Figure 3-3. Component Symbols — Typical (Sheet 1 of 10) 3-00-00 ECCN EAR99 27 MAY 2011 Rev. 1 Page 7 BHT-ELEC-SPM INSTRUMENTS A + A – IND B L V B + - C C INDICATOR AND CONNECTOR AMMETER (LOADMETER) VOLTMETER HOUR METER SENSOR PRESS A FIRE B C D E FAIL FIRE DETECTOR ELEMENT A A B B TEMP BULB PITOT HEATER TEMPERATURE CONTROLLER STATIC PORT HEATER A B C CHIP DETECTOR ELEC-SPM_ch03_0003b Figure 3-3. Component Symbols — Typical (Sheet 2 of 10) 3-00-00 Page 8 Rev. 1 27 MAY 2011 ECCN EAR99 BHT-ELEC-SPM LIGHTS R L C L L G NAVIGATION LIGHT COCKPIT LIGHT PANEL LIGHT + 1 S-RED + 3 W – ENG OUT – W 4 2 INCANDESCENT LAMP CHART LIGHT LED ANNUNCIATOR 1 A 1 2 L 2 E 3 3 L 4 SEARCHLIGHT LANDING LIGHT WARNING LIGHT 3 C L L 1 L G B L A 2 FIRE PULL HANDLE PRESS TO TEST AND INDICATOR ANTICOLLISION LIGHT (MAIN & RESERVE) 3 D 2 W A 4 B E 1 R A A 5 LIGHTING DOME LIGHT POWER SUPPLY MASTER WARNING LIGHT ELEC-SPM_ch03_0003c Figure 3-3. Component Symbols — Typical (Sheet 3 of 10) 3-00-00 ECCN EAR99 27 MAY 2011 Rev. 1 Page 9 BHT-ELEC-SPM RELAYS E X1 K X2 A1 A2 A A1 B A1 A2 B1 B2 A2 X1 F X1 X2 A3 X2 B1 C B2 G B3 D H SINGLE POLE/ SINGLE POLE/ DOUBLE POLE/ DOUBLE POLE/ SINGLE THROW DOUBLE THROW DOUBLE THROW DOUBLE THROW (DELAY) 1 2 A1 A2 A3 A2 11 12 A1 13 14 B3 B2 B1 3 X1 H X1 S3 X2 X2 S1 A 5A S2 5B PLUG-IN RELAY POWER RELAY RCCB RELAY BUS 13 14 A1 A2 COIL CONTROL CURRENT TIMER LEVEL AND SENSE OVRD SWITCH SW RESET RST BATTERY RELAY ELEC-SPM_ch03_0003d Figure 3-3.
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