ARINC 306 : 1955

FOREWORD
ACKNOWLEDGEMENT
INTRODUCTION
SECTION 1.0 GENERAL
1.1 Labelling of Equipment
1.2 Radio Noise
Section 2.0 AIRCRAFT WIRING
2.1 Wire Size
2.2 Mechanical Support
2.3 Resistors in Junction Box
2.4 High Voltage Protection
2.5 Relay Accessibility
2.6 Terminals
2.7 Pendant Cable Identification
Section 3.0 HIGH FREQUENCY COMMUNICATIONS SYSTEMS
3.1 Antenna Relays
3.2 Receiver Muting
3.3 Reception through Antenna Tuning Unit
3.4 Receiver Coupling Networks
3.5 Lightning Protection
3.6 Accessibility of Antenna Fittings
3.7 Transmitter Interlocking
3.8 Reliability of Dual HF Systems
3.9 Interference with Other Systems
3.10 Dielectric Antenna Materials
Section 4.0 VHF COMMUNICATIONS SYSTEMS
4.1 Dual Receiver Decoupling
4.2 Duplex Communications
4.3 Interference with Other Systems
4.4 Interchangeability with VOR Receivers
Section 5.0 VOR/LOCALIZER SYSTEMS
5.1 Dual Receiver Decoupling
5.2 VOR Receiver Interchangeability
Section 6.0 GLIDE SLOPE SYSTEMS
6.1 Disabling Provisions
6.2 Dual Receiver Decoupling
Section 7.0 ADF SYSTEMS
7.1 Flexible Shafts
7.2 Bilge Liquid Protection
7.3 Loop Calibration
7.4 Precipitation Static
7.5 Identification of Antennas
7.6 Dielectric Materials
Section 8.0 MARKER SYSTEMS
8.1 Marker Lights
8.2 Dual Marker Lights
8.3 Tuned Antennas
Section 9.0 AIRBORNE RADAR SYSTEMS
9.1 Antenna Size
9.2 Universal Radar Installation
9.3 Antenna Levelling and Mounting
9.4 Waveguide Installation
9.5 Absorbing Material
9.6 Gyro Stabilization Signals
Section 10.0 INTERCOMMUNICATION SYSTEMS
10.1 Cabin Attendant's Handset Muting
Section 11.0 AUDIO SELECTOR SYSTEMS, HEADPHONES, MICROPHONES,
                 COCKPIT SPEAKERS, AND AUDIO CONTROLS
11.1 Sidetone
11.2 Audio Selector Panels
11.3 Cockpit Speakers
Section 12.0 PASSENGER ANNOUNCING SYSTEMS
12.1 Priority of P.A. Mikes
12.2 Low Level Leads
12.3 P.A. Speakers
12.4 P.A. Mike Guard Switches
Section 13.0 RADIO CONTROLS
13.1 Frequency Selector Dial Lights
13.2 Control Panel Sizes and Configuration
13.3 Volume Controls
Section 14.0 RADIO INSTRUMENTATION
14.1 Isolation of D.I. Capacitors
14.2 Deviation Indicator Wiring
14.3 Deviation Indicator Circuit Protection
14.4 Instrument Ground Leads
14.5 Design Errors in Instrument Circuitry
14.6 Interaction of Instruments with Failures
14.7 Spin Damping Provisions
14.8 Synchro Lead Notation
14.9 Synchro Voltage Excitation
14.10 Power System Notation
14.11 Synchro Load Ratings
14.12 Design of Instrument Switching Systems
14.13 Accessibility of Relays
Section 15.0 ELECTRICAL POWER AND DISTRIBUTION
15.1 Ratings of Power Systems
15.2 Circuit Breakers and Fuses
15.3 Equipment Protection by Line Circuit Breakers
                 and Fuses
15.4 Trip-Free Circuit Breakers
15.5 Duplicate Distribution Systems
15.6 Division of Utilization Equipment
15.7 Auxiliary Power Provisions
15.8 Emergency Power Provisions
15.9 Nominal Design Voltage - DC System
15.10 Radio Equipment Power Wiring
15.11 AC Ground Return Leads
Section 16.0 RADIO RACKING, MOUNTS, AND COOLING PROVISIONS
16.1 Shock-Mounted Shelves
16.2 Design of Rack for ATR Equipments
16.3 Rack Dimensions
16.4 Accessibility and Maintenance of Rack Shelves
16.5 Design of Shock-Mounts
16.6 Provisions for Future Expansion - Shock-Mount
                 Ratings
Section 17.0 ATC TRANSPONDERS, DME
Section 18.0 PRECIPITATION STATIC PROVISIONS
18.1 Antenna Design for High Corona Threshold
18.2 Location of Wick Dischargers
18.3 Minimum Number of Wick Dischargers
Section 19.0 MISCELLANEOUS SYSTEMS
APPENDIX I INTERCHANGEABILITY REQUIREMENTS FOR VARIOUS
                 VOR RECEIVERS
APPENDIX II RADIO CONTROL PANELS
APPENDIX III BIBLIOGRAPHY OF REFERENCE DOCUMENTS

Provides basic information and helpful guidance to the aircraft manufacturers by setting forth recommended practices on aircraft electronic and radio installations. Consolidates into one document the various studies and conclusions coordinated over several years by the AEEC, and its Installation Coordination Subcommittee, working cooperatively with the airframe manufacturers as well as with the equipment manufacturers.