Cessna 170 Service Manual
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Cessna 170 Service Manual

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The Cessna 170
Service Manual
Published by
©
The International Cessna 170 Association
ELECTRICAL SYSTEM
©2004 The International Cessna 170 Association and George Horn
All Rights Reserved

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Summary of Contents for Cessna 170

  • Page 1 The Cessna 170 Service Manual Published by © The International Cessna 170 Association ELECTRICAL SYSTEM ©2004 The International Cessna 170 Association and George Horn All Rights Reserved...
  • Page 2 Cessna 170 owner, and devoted promoter of TIC170A, had long observed the painful lack of a service manual specifically for the 170 and made it his goal to address the issue. A manual had been contemplated for many years but had never been brought to fruition and Cleo apparently decided there would be no further harm in soliciting the services of yet another procrastinator.
  • Page 3 Cessna 170 Service Manual Electrical System ELECTRICAL...

  • Page 4: Table Of Contents

    Cessna 170 Service Manual Electrical System TABLE OF CONTENTS ELECTRICAL SYSTEM……………………………...Page 1 BATTERY AND EXTERNAL POWER SYSTEM Battery Battery Box Battery Solenoid. Master Switch. Ground Service Receptacle. Troubleshooting the Battery System……………..Page 2 Removal and Replacement Cleaning, Testing, and Charging…………………..Page 3 Battery Box Removal Battery Box Maintenance……………………..…….Page 4...
  • Page 5 Cessna 170 Service Manual Electrical System Table of Contents cont’d Electric Wire…………………………………………Page 14 General Aircraft Electrical Wire Wire Gauges and Ampacity Chart..………...……Page 15 Battery Cables Splices Open Wiring…………………………….……………Page 16 Heat Precautions Protections Against Chafing Stripping Terminals Attachment of Terminals to Studs……………….Page 17...

  • Page 6: Electrical System

    25 ampere-hours (originally 24 ampere-hours). All batteries are 12-volt and are housed in a battery box attached to the firewall. The battery on the 170 is accessible by removing the cowl, or on certain models thru an access door on the cowl.

  • Page 7: Troubleshooting The Battery System

    Cessna 170 Service Manual Electrical System TROUBLE SHOOTING THE BATTERY SYSTEM. BATTERY DOES NOT SUPPLY POWER TO BUS WHEN MASTER SWITCH IS ON. Dead battery: Check specific gravity of electrolyte. Gravity reading should be at least 1.256, which indicates a 75% charge at normal temperature. Replace or charge battery. Check charging rate of generator.

  • Page 8: Removal And Replacement

    Cessna 170 Service Manual Electrical System CLEANING THE BATTERY. For maximum efficiency, the battery and connections should be kept clean at all times. a. Remove the battery in accordance with the preceding paragraph. b. Tighten battery cell filler caps to prevent the cleaning solution from entering the cells.

  • Page 9: Battery Box Removal Battery Box Maintenance

    A 12-ampere generator system is standard equipment. A 20, 25, or a 35-ampere generator is optional on these models. If additional power is needed on the 170, an alternator conversion is possible resulting in various ratings up to 60 amperes.

  • Page 10: Generator Warning Light

    GENERATOR WARNING LIGHT. Cessna 170’s were not factory equipped with generator warning lights. However a few owners desired this feature and adapted it from other Cessna models. The following description of this system is provided for those aircraft so modified. The generator warning light is designed to indicate when the generator is not charging the battery.

  • Page 11: Voltage Regulator

    Cessna 170 Service Manual Electrical System If a generator is not correctly polarized the regulator and generator may be damaged. VOLTAGE REGULATOR. The voltage regulator is a vibrating contact type containing three relays. The voltage and current limiting relays control the output of the generator according to the demand of the battery.

  • Page 12: Troubleshooting The Generator/Regulator

    Cessna 170 Service Manual Electrical System generator. Therefore, it is important that both generator and regulator be of the same capacity to obtain best performance without damage. TROUBLESHOOTING THE GENERATOR/REGULATOR SYSTEM NO CHARGE INDICATED ON AMMETER. If the charging circuit does not indicate a charge or if the ammeter indicates the generator is not producing current at normal cruising RPM, the trouble can be isolated without special tools or instrumentation.

  • Page 13: Simple Generator Test

    Cessna 170 Service Manual Electrical System A SIMPLE GENERATOR TEST involves recognition that a generator is merely the mirror image of an electric motor. A generator may be easily tested on the workbench by securely clamping it in a vice or placing it upon the floor between two aircraft chocks to prevent its rolling, and placing one’s foot firmly upon...

  • Page 14: Isolating Too Low/High Charge

    (The Cessna 170 has a gear-driven generator, but other aircraft with belt-driven generators may also show this symptom with loose or worn drive belts.) The above tests are conclusive in determining whether the regulator is at fault or whether the fault lies elsewhere.

  • Page 15: Engine Starter

    Cessna 170 Service Manual Electrical System cleaning. Be certain to clean the points when finished with electronics cleaner or alcohol (NOT rubbing alcohol which may contain glycerin.) REMEMBER: The single most overlooked solution to generator/regulator problems is lack of proper polarization, followed by improper grounds.
  • Page 16 ROTATING BEACON. Rotating beacons (anti-collision lighting) was not required but was an option during certification of the 170, but most owners have subsequently retrofitted these aircraft with such systems. The rotating beacon is mounted to the fuselage, either/or top or bottom. Most units are either Grimes or Whelen and mount similarly with three machine screws through the case into a mounting ring.

  • Page 17: Pltot And Stall Warning Heater

    The system originally designed for the aircraft is a Kollsman heated pitot unit in accordance with Cessna Dwg. 0511051. This is a straight pitot similar to that used on C- 190/195 series aircraft. Some aircraft have been modified with “L”-type units of the AN-5812 types found on later series Cessna aircraft.

  • Page 18: Troubleshooting The Electrical System

    Cessna 170 Service Manual Electrical System TROUBLESHOOTING THE ELECTRICAL SYSTEM There are two simple and inexpensive tools with which your electrical system troubleshooting may be performed. An inexpensive Volt/Ohm meter or MultiMeter is the single, most useful tool you can have to troubleshoot your electrical system. Along with the MulitMeter, an inexpensive set of heavy-duty jumper wires or “test leads”...

  • Page 19: Electric Wire

    3 feet, in areas where corrosive fumes exist. It is not recommended for use in communication or navigation systems. Note: Aluminum and Silver coated wire was never used in Cessna 170s originally, but this information is being supplied in the event any is found subsequently installed.

  • Page 20: Wire Gauges And Ampacity Chart

    300 Amp and greater currents sometimes generated during start. Therefore, to save weight and costs Cessna originally provided battery cables of 4 gauge. It is recommended that larger gauges be considered for replacement purposes. Sizes 1 or 1/O is recommended for the short runs from battery to solenoid to starter terminal lug, and from battery negative terminal to aircraft ground as well as from the Ground receptacle to the battery solenoid.

  • Page 21: Open Wiring

    Cessna 170 Service Manual Electrical System OPEN WIRING. Electric wiring is often installed in aircraft without special enclosing means. This practice is known as open wiring and offers the advantages of ease of maintenance and reduced weight. a. Wire Bundles. To simplify maintenance and to minimize the damage that may result from a single fault, limit the number of wires in the run.

  • Page 22: Attachment Of Terminals To Studs

    Cessna 170 Service Manual Electrical System b. Solderless Terminals. The terminal manufacturer will normally provide a special crimping or swaging tool for joining the solderless terminal to the electric wire. Aluminum wire presents special difficulty in that each individual strand is insulated by an oxide coating. This oxide coating must be broken down in the crimping process and some method employed to prevent its reforming.

  • Page 23: Corrosion Prevention

    ¼” diameter) and their performance is sometimes intermittent due to reduced contact area within the holder. The original Cessna part number (0411023) is the AGS series fuse with a following “dash” number indicating the amperage. If this PN is searched for results may be frustrating. The modern equivalent Cessna part number is: S1091 followed by the appropriate dash number.
  • Page 24 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.

  • Page 25: Electrical Schematics

    Cessna 170 Service Manual Electrical System ELECTRICAL SCHEMATIC SNs 20267 THRU 25372...
  • Page 26 Cessna 170 Service Manual Electrical System ELECTRICAL SCHEMATIC SNs 25373 THRU 26995...
  • Page 27 Cessna 170 Service Manual Electrical System ELECTRICAL SCHEMATIC SNs 26996 AND ON...
  • Page 28 Cessna 170 Service Manual Electrical System INSTRUMENT PANEL - ELECTRICAL SCHEMATIC SNs 26996 AND ON...
  • Page 29 Cessna 170 Manual Electrical System...
  • Page 30 Cessna 170 Manual Electrical System...
  • Page 31 Cessna 170 Manual Electrical System...
  • Page 32 Cessna 170 Manual Electrical System ===============================================================...
  • Page 33 Cessna 170 Service Manual Electrical System...
  • Page 34 Cessna 170 Service Manual Electrical System...

  • Page 35: Late Style Battery Solenoid (Relay)

    Cessna 170 Service Manual Electrical System Appdx. EL 1 Fig. EL-01 Ground Service Plug and Early Battery Solenoid (Relay) Fig. EL-02 Late Style Battery Solenoid (Relay)

  • Page 36: Battery Solenoid (Relay) And Master Switch Circuit

    Cessna 170 Service Manual Electrical System Appdx. EL-2 Fig. EL 03, Battery Solenoid (Relay) and Master Switch Circuit Fig. EL-04, Landing Light Adjustment Land Lamp Taxi Lamp Position 1 = .56” Position 2 = .62” Position 5 = .56” Position 6 = .90”...

  • Page 37: Multimeter

    Cessna 170 Service Manual Electrical System Appdx. EL-3 Fig. EL-05, MultiMeter Fig. EL-06, Test Leads...

  • Page 38: Generator Motor Test Schematic

    Cessna 170 Service Manual Electrical System Appdx EL-4 Fig. EL-07. GENERATOR MOTOR TEST SCHEMATIC NEGATIVE BATTERY CABLE TO CASE POSITIVE BATTERY CABLE TO ARM TERMINAL FIELD TERMINAL TO CASE FIG. EL-08, TEST FOR GENERATOR SHORT...
  • Page 39 Cessna 170 Service Manual Electrical System Appdx. EL 5 FIG. EL-09, VOLTAGE REGULATOR CIRCUIT BREAKER OR REVERSE CURRENT RELAY...
  • Page 40 Cessna 170 Service Manual Electrical System Appdx. EL 6 TEST 1 (CONFIRM REGULATOR GROUND) TEST 2 (ISOLATE REGULATOR)
  • Page 41 Cessna 170 Service Manual Electrical System Appdx EL 7 Fig. EL-09 cont’d, VOLTAGE REGULATOR TEST 3 (CUT OUT RELAY) Fig. EL-10. STARTER CABLE/LEVER ADJUSTMENT...

This manual is also suitable for:

Tic170a

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