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% B. Install the External Power Relay %
Detail Steps/Work Items Key Items/References
(1) Put the relay in position in the relay junction box.
(2) Install the 2 attaching bolts.
(3) Install the washers and nut that attach the bus bar to the relay.
(4) Connect the power and control cables to the external power relay. Refer to Chapter 92 for the wiring diagrams.
(5) Install the cover to the relay box.
(6) Connect the positive cable to the battery. Apply Dow Corning compound (DC4) to the battery terminal and the cable lug.
(7) Connect the negative cable to the battery. Apply Dow Corning compound (DC4) to the battery terminal and the cable lug.
(8) Install the engine cowlings. Refer to Section 71-11.
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% Section 24-60 % DC Electrical Load Distribution - Lycoming Engine
1. General
% This Section tells you about the system which supplies DC electrical power for other systems for % airplanes with the Lycoming engine installed. The DC electrical load distribution system has these components: ) Main bus. ) Avionic bus. ) Essential bus (optional). ) Essential avionic bus (only when the electrical system has an essential bus). ) Battery bus. ) Hot bus. ) Battery relay. ) Avionic master relay. ) Essential avionics relay (only when the electrical system has an essential bus). ) Switches. ) Circuit-breakers. Refer to Section 24-30 for the DC generation system.
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AVIONIC
VOLTAGE REGULATOR
MAIN BUS
BUS
Figure 1: DC Electrical Load Distribution without Essential Bus (simplified)
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2. Description
A. Main Bus and Essential Bus
(1) Electrical System without Essential Bus
The alternator supplies the main bus through the alternator circuit-breaker. The battery supplies the main bus through the battery relay and the battery circuit-breaker. The battery supplies a positive voltage to the coil of the battery relay. The ALT/BAT switch connects the other side of the coil to ground.
The main bus supplies the airplane electrical systems through circuit-breakers.
(2) Electrical System with Essential Bus
The alternator supplies the main bus through the alternator circuit-breaker. The battery supplies the essential bus through the battery relay and the battery circuit-breaker. The battery supplies a positive voltage to the coil of the battery relay. The ALT/BAT switch connects the other side of the coil to ground.
The essential bus supplies the following electrical consumers through circuit-breakers:
) NAV/COM 1.
) Transponder (XPDR).
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