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

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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.

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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

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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.

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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)

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

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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)

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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)

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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

C L L 1 L G B L A 2

FIRE PULL HANDLE PRESS TO TEST AND INDICATOR ANTICOLLISION LIGHT (MAIN & RESERVE)

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)

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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. Component Symbols — Typical (Sheet 4 of 10)

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POWER COMPONENTS

PUSH SWITCH

5 A1 A2 -+ PUSH PULL A3 REMOTE CONTROL

CAPACITOR CIRCUIT BREAKER

– B – B + + + CE CE + NPN PNP

EXTERNAL POWER RECEPTACLE TRANSISTOR FUSE BUS BAR

B A

E ARM

D E C B D A

STARTER GENERATOR

A B – + C

GENERATOR REGULATOR VOLTAGE REGULATOR CONTROL UNIT SHUNT

X2X1 M

TRANSFORMER CURRENT (STEP UP OR DOWN) TRANSFORMER INVERTER ELEC-SPM_ch03_0003e Figure 3-3. Component Symbols — Typical (Sheet 5 of 10)

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POWER COMPONENTS

+ – + + – BATTERY A – B C D

BATTERY

C OPEN M A E CLOSE D

INTERCONNECT VALVE VALVE

CLOSE D B

PMM E OPEN

A C

F G

SHUT-OFF VALVE

ELEC-SPM_ch03_0003f Figure 3-3. Component Symbols — Typical (Sheet 6 of 10)

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SWITCHES

A3 A2 A1

SINGLE POLE/ SINGLE POLE/ SINGLE POLE/ SINGLE THROW SINGLE THROW DOUBLE THROW (ALTERNATE ACTION) (MOMENTARY ACTION)

PUSH-ON CENTER SINGLE POLE/ PUSH-OFF SWITCH SINGLE THROW RELAY RESET SWITCH FOOT SWITCH

15 INCR DECR 14 16

P A NC A 13 17 COM B NO C B NO NO NO 12 11 18 C C OFF DOUBLE POLE/ PRESSURE SWITCH SELECTOR SWITCH DOUBLE THROW-INDEPENDENT

EXTEND/ON UP

LEFT RIGHT LEFT RIGHT

RETRACT/STOW DOWN

THERMAL OVERHEAT SWITCH SWITCH FOUR POSITION SWITCH

NORMALLY OPEN

NORMALLY CLOSED

PUSH BUTTON SWITCH POTENTIOMETER (CONTROLS VOLTAGE) RHEOSTAT (CONTROLS CURRENT)

ELEC-SPM_ch03_0003g Figure 3-3. Component Symbols — Typical (Sheet 7 of 10)

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SWITCHES

PTT

NO NC 2 1 4 3 C

INERTIA SWITCH GOV RPM SWITCH TEST SWITCH MOMENTARY SWITCH

ENG 1 3 1 2 2 5 A 4 OEI TRNG 4 1 NC 6 3 C 7 NO PUSH 2 B 4 ENG 2 8 TO TEST 1 3

MAGNETICALLY HELD SWITCH MOMENTARY PUSH SWITCH NORMALLY CLOSED

TRIM 2 A ON 3 B 1 2 OFF STOP 5 4 3 5 6 4 HIGH 7 OFF 5 C1 3 8 DIM LOW 9 6 2 10 1 INT 11 7 BRT OFF/MANUAL 12 ON ENABLE 13 14 15 16

SWITCH/LIGHT ROTARY KNOB ROTARY SWITCH

ELEC-SPM_ch03_0003h Figure 3-3. Component Symbols — Typical (Sheet 8 of 10)

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MISCELLANEOUS

ANODE + CATHODE –

+ –

STRUCTURAL GROUND + – ZENER DIODE

END CAP DIODE

+ RED R_ _

– BLUE HOLDING PUMP RESISTOR COIL PANEL LIGHT PLUG

FUEL UNIT A A CELL COUPLER (TYP) (TYP) B D

FUEL QUANTITY CONNECTORS SOLENOID VALVE

T SHIELDED SINGLE

(TRIPLE) (PAIR) COAXIAL CABLE

ENGINE VIB. METER RECPT SHIELDED WIRES IN CABLE

AIR CORE IRON CORE

HEATED BLANKET RECEIVER RECEPTACLE TRANSMITTER INDUCTORS THERMOCOUPLE HARNESS CONTROLS

ELEC-SPM_ch03_0003i Figure 3-3. Component Symbols — Typical (Sheet 9 of 10)

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MISCELLANEOUS

A A

B B C

MISCELLANEOUS EQUIPMENT FIRE EXTINGUISHER CARTRIDGE

+ –

HORN OR LOUDSPEAKER HEADSET MICROPHONE

THERMISTOR TEMPERATURE SENSOR

A B C

INDICATOR PANEL

ELEC-SPM_ch03_0003j Figure 3-3. Component Symbols — Typical (Sheet 10 of 10)

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3-5. ELECTRICAL COMPONENTS AND item such as a connector, which connects to the ASSEMBLIES — REFERENCE particular reference designator. DESIGNATOR ASSIGNMENT Components are identified by their reference designator on the electrical schematics, wiring Each electrical component and assembly is assigned diagrams, and by a decal or label adjacent to their an alphanumeric code on the wiring diagrams and installed location on the helicopter. Table 3-4 provides schematics called a reference designator (Figure 3-4). an example of a reference designator listing that may be provided in some Maintenance Manuals.

The reference designator consists of a system number The Index of Reference Designator listing provided in (Table 3-2) and unit number (Table 3-3) for Illustrated Parts Breakdown Manuals (IPB) may also identification. Item numbers (Table 3-3) are also used be used to identify the installed location of the at the end of the reference designator to identify an component as well as its part number.

Table 3-2. Reference Designator — System Table 3-2. Reference Designator — System Number and Description (Typical) Number and Description (Typical) (Cont)

SYSTEM SYSTEM SYSTEM DESCRIPTION SYSTEM DESCRIPTION 1 NUMBER 1 NUMBER 1 1

1 Propulsion and Fuel Systems 2240 Autopilot System Monitor

2 DC Power System, Start and 2300 Communications System — Ignition System General

4 Instruments Panels and Console 2310 Communications — (HF)

6 Flight Controls 2320 Communications — (VHF)

8 Light Systems 2321 Communications — (ELT)

9 Flight Control Hydraulic System 2330 Communications — Passenger Address and Entertainment 10 Environmental Control Systems 2340 Communications — Interphone 24 Float, Cargo Hook, and Miscellaneous Kits 2350 Communications — Audio Integrating 2100 Air Conditioning — General 2360 Communications — Static 2140 Heating System Dissipation 2150 Cooling System 2370 Communications — Audio and 2160 Temperature control Video

2200 Autopilot System — General 2400 Electrical Power System — General 2210 Autopilot System 2420 AC Generation System 2220 Autopilot Speed — Attitude Correction 2430 DC Generator Power System

2230 Autopilot Auto Throttle 2440 External DC Power System

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Table 3-2. Reference Designator — System Table 3-2. Reference Designator — System Number and Description (Typical) (Cont) Number and Description (Typical) (Cont)

SYSTEM SYSTEM SYSTEM DESCRIPTION 1 SYSTEM DESCRIPTION 1 NUMBER 1 NUMBER 1

2450 Electrical Power — Electrical 2930 Hydraulic Power — Indicating Load Distribution 3000 Ice and Rain Protection System 2500 Equipment — General — General

2510 Equipment — Flight Compartment 3030 Ice and Rain Protection System — Pitot and Static 2520 Equipment — Passenger Compartment 3040 Ice and Rain Protection System — Windows and Windshield 2560 Equipment — Emergency 3060 Ice and Rain Protection System 2580 Equipment — Cargo Hook — Rotors and Prop Rotors 2581 Equipment — External Hoist 3080 Ice and Rain Protection System 2600 Fire Protection System — — Detection General 3100 Indicating/Recording System — 2610 Fire Detection System General

2620 Fire Extinguishing System 3130 Indicating/Recording System — 2700 Flight Control System — General Recorders/Data Acquisition

2701 Flight Control System — Copilot 3140 Indicating/Recording System — Collective Central Computer

2702 Flight Control System — Pilot 3150 Indicating/Recording System — Collective Central Warning

2703 Flight Control System — Copilot 3160 Indicating/Recording System — Cyclic Grip Central Display System

2704 Flight Control System — Pilot 3170 Indicating/Recording System — Cyclic Grip Aircraft Data Interface Unit (ADIU)

2720 Flight Control System — 3200 Landing Gear System — General Collective Position Sensor 3210 Landing Gear System — Main 2800 Fuel System — General Gear and Doors

2810 Fuel System — Storage 3220 Landing Gear System — Nose Gear and Doors 2820 Fuel Balance System — Control/ Distribution 3230 Landing Gear System — Extension and Retraction 2840 Fuel System — Fuel Gauging/ Indicating 3240 Landing Gear System — Wheels and Brakes 2900 Hydraulic Power — General 3260 Landing Gear System — Position 2910 Hydraulic Power — Main System and Warning

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Table 3-2. Reference Designator — System Table 3-2. Reference Designator — System Number and Description (Typical) (Cont) Number and Description (Typical) (Cont)

SYSTEM SYSTEM SYSTEM DESCRIPTION 1 SYSTEM DESCRIPTION 1 NUMBER 1 NUMBER 1

3300 Lighting System — General 3930 Electrical/Electronic Components — Junction Boxes and Relay 3310 Lighting System — Flight Panels Compartment 3940 Electrical/Electronic Panels and 3320 Lighting System — Passenger Components — Multipurpose Compartment Electronics Components 3340 Lighting System — Exterior 3942 Electrical/Electronic Panels and 3347 Lighting System — Searchlight Components — Terminal Module 3380 Lighting System — Emergency 3945 Electrical/Electronic Panels and 3400 Navigation System — General Components — Ground Module

3406 Navigation System — ADF 3950 Electrical/Electronic Panels and Components — Integrated 3407 Navigation System — ADAHRS Circuits

3410 Navigation System — Flight 3960 Electrical/Electronic Panels and Environment Data Components — Printed Circuit 3420 Navigation System — Attitude Card Assemblies and Direction 4296 Integrated Avionics System

3421 Navigation System — Weather 4350 Pilot Headset Radar 5200 Doors — General 3427 Navigation System — Transponder, Encoding Altimeter 5270 Door Warning

3440 Navigation System — TCAS 6500 Rotor System — General

3450 Navigation System — GPS 6510 Rotor System — Main Rotor

3460 Navigation System — Display 6520 Rotor System — Anti-torque Unit Heater Rotor Assembly 3470 Navigation System — Course 6530 Rotor System — Accessory Heading Flight Director Panel Drives/Gearboxes (CHFD) 6540 Rotor System — Controlling

3900 Electrical/Electronic Panels and 6550 Rotor System — Braking Components — General 6560 Rotor System — Indicating 3910 Electrical/Electronic Panels and 7100 Power Plant System — General Components — Instruments and Control Panels 7150 Power Plant System — Electrical Harness 3920 Electrical/Electronic Panels and Components — Equipment Racks

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Table 3-2. Reference Designator — System Table 3-2. Reference Designator — System Number and Description (Typical) (Cont) Number and Description (Typical) (Cont)

SYSTEM SYSTEM SYSTEM DESCRIPTION 1 SYSTEM DESCRIPTION 1 NUMBER 1 NUMBER 1

7160 Power Plant System — Inlet 7900 Oil — General Barrier Filter 7930 Oil — Indicating 7200 Engine — General 8000 Engine Start System — General 7300 Engine Fuel and Control System 8010 Engine Start System — Cranking — General 9500 Crew Escape and Safety — 7320 Engine Fuel and Control System General — Controlling 9560 Crew Escape and Safety — 7330 Engine Fuel and Control System Flotation — Indicating 9900 Surveillance — Articulated 7400 Ignition — General Landing Light 7410 Ignition — Electrical Power NOTE: Supply

7420 Ignition — Distribution 1 The listing provided is typical and is primarily based on DOD-STD-863B. Due to 7500 Air — General differing system number and descriptions 7510 Air — Engine Anti-icing used in the past, refer to the specific helicopter model Maintenance Manual for 7540 Air — Indicating additional information. 7700 Engine Indicating — General

7710 Engine Indicating — Power

7720 Engine Indicating — Temperature

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Table 3-3. Reference Designator — Unit Number Table 3-3. Reference Designator — Unit Number and Item Number Letter Codes (Typical) and Item Number Letter Codes (Typical) (Cont)

LETTER LETTER CLASS OF COMPONENT CLASS OF COMPONENT CODE CODE

A Electronic or Electrical Assembly, LS Speaker, Warning Horn Control Panel, Fuel Probe M Indicator, Clock

AT Electrical or Electronic Termination MG Starter Generator

B Electrical Driven Pump, Blower, Fan MP Directional Gyroscope BT Battery, Battery Cell MT Sensor, Transducer

C Capacitor ND Ground Assembly

CB Circuit Breaker P Electrical Connector

CM Computer PS Power Supply

CP Control Panel (avionics), Coupler QTransistor Connector, Adapter (electrical) R Resistor, Shunt CR Diode, Diode Assembly RE Receiver (avionics) CT Course Heading Flight Director Panel (CHFD) RT Resistive Temperature Bulb

DLight SSwitch

DS Light Assembly (electrical), Indicator T Transducer (avionics), Alarm, Annunciator TB Terminal Block

E Chip Detector (electrical), Fire TC Thermocouple Detection Element, Temperature TR Transceiver (avionics), Magnetometer Probe, Igniter, Antenna (avionics) TX Transmitter (avionics) FFuse VR Voltage Regulator, Generator G Pressure Transducer, Accelerometer Regulator Control Unit (GRCU) HR Heater WTB Junction Module J Electrical Receptacle WTD Ground Module K Relay, Contactor XK Relay Mount Socket L Solenoid, Searchlight Z Fuel Signal Conditioner

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Table 3-4. Electrical and Electronic Components, Reference Designator/Description/Location — Reference Table (Examples)

REFERENCE FIGURE SHEET COMPONENT DESCRIPTION LOCATION DESIGNATOR LOCATION

407 MAINTENANCE MANUAL EXAMPLE

2S1 Switch, BATT Switch Overhead Console Sheet 11 2S2 Switch, GEN RESET Switch Overhead Console Sheet 11

2TB1 Terminal Board (junction block) Overhead Console Sheets 11 and 14

2VR1 Voltage Regulator FS 160.0, LBL 20.0, WL 52.0 Sheets 16 and 20

2VR1P1 Connector, Voltage Regulator FS 160.0, LBL 20.0, WL 52.0 Sheets 16 and 20 2XK4 Relay Socket, Field/Igniter Relay FS 166.0, DC Equipment Panel Sheet 20

3CB1 Toggle Circuit Breaker 30 amps, Overhead Console Sheet 11 OFF AVIONICS MASTER (kit) 3J1 Receptacle, DC Power Panel FS 155.0, WL 60.0, Right Side Sheet 16

3P1 Connector, DC Power Panel FS 155.0, WL 60.0, Right Side Sheet 16

4A1 Switch Box, Collective Collective Sheet 8

412 MAINTENANCE MANUAL EXAMPLE

1A1 Engine and Fuel Control Panel

1A1P1 Connector

1A1P2 Connector

1A1K1 Fuel Crossfeed Relay

1A1S1 Engine 1 Fuel Switch

1A1S2 Engine 2 Fuel Switch

1A1S3 Engine 1 Gov Switch

1A1S4 Engine 2 Gov Switch

1A1S5 Engine 1 Boost Pump Switch 1A1S6 Engine 2 Boost Pump Switch

1A1S7 Fuel Intcon Switch

1A1S8 Fuel Crossfeed Switch 1A1S9 Fuel Intcon/Crossfeed Switch

1A1S12 Engine 1 Fuel Transfer Switch

1A1S13 Engine 1 Fuel Transfer Switch

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8DS3J1

ITEM NUMBER J-CONNECTOR, RECEPTACLE 1-CONNECTOR NO.1 UNIT NUMBER (CERTAIN UNITS CAN HAVE DS-LIGHT ASSEMBLY MORE THAN ONE CONNECTOR. SYSTEM NUMBER 3-3RD ASSEMBLY IN THIS CASE THEY WOULD BE (LIGHTING) IDENTIFIED J2, J3, ETC.)

ELEC-SPM_ch03_0009 Figure 3-4. Reference Designator

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3-6. RESISTOR CHARACTERISTIC CODES

For film type resistors Table 3-5 will identify the resistance in ohms, tolerance and type of attachment. Refer to Figure 3-5 for typical film resistor color codes. RE, RER, and RWR type codes are explained in Table 3-6 through Table 3-8 respectively.

Table 3-5. Film Type Resistor Color Codes

BAND A2 BAND B3 BAND C 4 BAND D 5 BAND E 6 BAND F 7 Color Color Color Color Color Color First significant number Second significant number significant Third number Multiplier Resistance Tolerance (percent) Solderable Terminal

Silver Silver Silver Silver 10-2 Silver ±10% White

(x 0.01) Yes

Gold Gold Gold Gold 10-1 Gold ±5% No Band

(x 0.1) No Black 0 Black 0 Black 0 Black 1 Brown 1 Brown 1 Brown 1 Brown 10 Brown ±1%

Red 2 Red 2 Red 2 Red 102 Red ±2%

Orange 3 Orange 3 Orange 3 Orange 103

Yellow 4 Yellow 4 Yellow 4 Yellow 104

Green 5 Green 5 Green 5 Green 105 Green ±0.5%

Blue 6 Blue 6 Blue 6 Blue 106 Blue ±0.25%

Violet 7 Violet 7 Violet 7 Violet 107 Violet ±0.10%

Gray 8 Gray 8 Gray 8 Gray 108 Gray ±0.05% White 9 White 9 White 9 White No ±20% Color

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Table 3-5. Film Type Resistor Color Codes (Cont)

NOTES:

1 Example of color coding 5100 ohms ±1%, solderable leads. Band A — green; Band B — Brown; Band C — Black; Band D — Brown; Band E — Brown; Band F — White

2 The first significant number of the resistance value.

3 The second significant number of the resistance value.

4 The third significant number of the resistance value. This significant number is only applicable to resistors with a 5-band coding (Figure 3-5).

5 The multiplier (the multiplier is the factor by which the significant numbers are multiplied to yield the nominal resistance value).

6 The resistance tolerance.

7 Indicates a solderable terminal and has a white indicator band. This band is approximately 1.5 times the width of other bands. This band is only applicable to resistors with military specifications. Commercial resistors may have a band indicating the temperature coefficient or resistor reliability.

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4 BAND

BAND B BAND E BAND F (ONLY SHOWN WHEN RESISTOR BAND A BAND D HAS SOLDERABLE TERMINALS)

TOLERANCE ≥2%

1 245 6 1 2 3 4 5 TOLERANCE ≤1%

BAND A BAND C BAND E BAND B BAND D

5 BAND 1. 1st significant figure 2. 2nd significant figure 3. 3rd significant figure 4. Multiplier 5. Resistance tolerance 6. Solderable terminal

FOUR BAND CODE EXAMPLES

Green, blue, red, with silver tolerance band: 56 x 100 = 5.6 ohms, with a tolerance of 10%, white band for solderable terminals.

Red, red, brown, silver tolerance band: 22 x 10 = 220 ohms (220 ohms), with a tolerance of 10%.

Brown, black, orange, gold tolerance band: 10 x 1000 = 10000 ohms (or 10K ohms), with a tolerance of 5%.

FIVE BAND CODE EXAMPLES

Red, red, brown, black, with a brown tolerance band: 221 x 1 = 221 ohms, with a tolerance of 1%, white band for solderable terminals.

Blue, brown, white, brown, green tolerance band: 619 x 10 = 6190 ohms (6.19K ohms), with a tolerance of 0.5%.

Brown, black, black, red, with a brown tolerance band: 100 x 100 = 10000 ohms (10.0K), with a tolerance of 1%.

NOTE 1 Refer to Table 3-5 for additionnal information.

ELEC-SPM_ch03_0010 Figure 3-5. Typical Film Resistor Color Codes

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Table 3-6. RE Type Resistance Code

RE77 G 1001

Style: The two-letter symbol RE identifies chassis-mounted, power type, wirewound fixed resistors; the two-digit number identifies the physical size and power rating.

Characteristics: The single-letter symbol identifies the maximum continuous operating temperature and type of winding as follows:

G (inductive wound) — +250°C maximum continuous operating temperature N (non-inductive wound)

Resistance: The four-digit number identifies the nominal resistance value, expressed in ohms; the first three digits represent significant figures and the last digit specifies the number of zeros to follow. For values less than 100 ohms, all digits are significant with the letter "R" representing the decimal point (see the following examples).

Examples: R050 = 0.05 ohm R100 = 0.10 ohm 1R00 = 1.0 ohm 10R0 = 10.0 ohms 1000 = 100 ohms 1001 = 1000 ohms 1002 = 10,000 ohms

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Table 3-7. RER Type Resistance Code

RER65 F 1001 M

Style: The three-letter symbol RER identifies established reliability, chassis-mounted, power type, wirewound, fixed resistors; the two-digit number identifies the physical size and power rating.

Resistance tolerance: The single-letter symbol identifies the resistance tolerance as follows:

F = ±1.0%

Examples: R100 = 0.10 ohm 1R00 = 1.0 ohm 10R0 = 10.0 ohms 1000 = 100 ohms 1001 = 1000 ohms 1002 = 10,000 ohms

Failure rate level: The single-letter symbol identifies the life failure rate as follows:

M = 1.0%/1000 hours P = 0.1%/1000 hours R = 0.01%/1000 hours S = 0.001%/1000 hours

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Table 3-8. RWR Type Resistance Code

RWR74 S 49R9 F M

Style: The three-letter symbol RWR identifies axial-lead, power type, wirewound, fixed resistors; the two-digit number identifies the physical size and power rating.

Terminal and winding: Terminal capability and inductive or noninductive winding designation as follows:

S = Solderable, inductive wound W = Weldable, inductive wound N = Solderable, noninductive wound Z = Weldable, noninductive wound

Examples: R100 to R988 = 0.1 to 0.988 inclusive 1R00 to 9R88 = 1.0 to 9.88 inclusive 10R0 to 98R8 = 10 to 98.8 inclusive 1000 to 9888 = 100 to 988 inclusive 1001 to 9881 = 1000 to 9880 inclusive 1002 to 4022 = 10,000 to 40,200 inclusive

Resistance tolerance: The single-letter symbol identifies the resistance tolerance as follows:

B = ±0.1% D = ±0.5% F = ±1.0%

Failure rate level: The single-letter symbol identifies the failure rate as follows:

M = 1.0%/1000 hours P = 0.1%/1000 hours R = 0.01%/1000 hours S = 0.001%/1000 hours

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