Cessna 170, Service Manual

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Cessna 170 Service Manual
Electrical System
WIRING CIRCUIT DIAGRAMS AND IDENTIFICATION
The following pages contain diagrams and wiring identification information as the
B-model Cessna 170 aircraft was originally designed. They are offered for the
purpose of providing original documentation for the noted aircraft and as a
resource guide for previous models. Subsequent alterations and modifications
may have significantly changed these. Many aircraft have specific electrical
blueprints appropriate to that serial number, and any new electrical work
performed should include the production of appropriate electrical schematics
which should be kept with the aircraft maintenance records.
Be especially cautious when replacing equipment and wiring in the aircraft.
Original wiring gauges, switches, and current limiters may not be adequate for
subsequently added equipment. Example: An aircraft originally equipped with a
12 ampere generator was equipped with a 10 gauge wire in the main electrical
supply buss circuits and in the generator-to-battery circuit. If the aircraft was
subsequently modified with the addition of a 35 ampere generator and regulator
that wiring may be insufficient and the associated current limiting device will also
be insufficient. Alternator conversions will exacerbate this problem.
Therefore, confirm that your aircraft is adequately equipped with regard to wire
sizes and current limiting devices (fuses and/or circuit breakers.) Consult the
Electric Wire section of this manual and/or FAR 43.13-1A, Acceptable Methods,
Materials, and Techniques when utilizing these diagrams.