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Comprehensive Guide to Electrical Systems in Aircraft: Understanding 28V and Schematic Layouts

This guide simplifies the intricacies of aircraft electrical systems, focusing on the 28-volt system featuring a 10-ampere battery and dual 75-amp belt-driven alternators. We explore how Alternator Control Units regulate voltage, the role of the tie bus and circuit breakers, and the essential functions of the annunciator panels. Key components such as courtesy lights, overhead dome rheostats, and avionics lighting are elaborated upon. This resource is designed for anyone looking to comprehend and build their knowledge of aircraft electrical systems.

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Comprehensive Guide to Electrical Systems in Aircraft: Understanding 28V and Schematic Layouts

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Presentation Transcript

  1. Electricity – made understandable

  2. Starting to “build the electrical system”

  3. A more simple electrical schematic

  4. Electricity • 28 volt system • (1) 10 ampere battery • Located under nose baggage compartment floor • (2) 75 amp belt driven alternators • (1) each Alternator Control Units • Regulate voltage, shut down alternator in the event it begins to produce excessive (32+) voltage, parallels the two alternators

  5. Routing • Power from battery continuously available to hot battery bus • Grd Clearance • Courtesy lights • Nose baggage compartment light

  6. Routing - 2 • Power available from battery through master switch, to the 80 amp circuit breaker on to the tie bus • Tie Bus • 2 Main buss circuit breakers • 1 non-ess circuit breaker • 2 avionics circuit breakers

  7. What is a buss?

  8. Battery & Hot Batt Buss fuses

  9. 2 alternators

  10. Avidyne Equipped Mirage Tie Buss panel

  11. Main Buss Panels and Non-Ess Buss

  12. Avionics Buss 2006

  13. ELECTRICITY • INTERIOR LIGHTS • Overhead dome rheostats • Switch, Panel & Avionics rheostats • Switch • Switch backlighting • Panel • Post lights • Stby instruments • EL • Flap indicator

  14. 1997 Mirage Annunciator Panel

  15. What should be illuminated prior to engine start

  16. 1998 / 1999 Mirage Annunciator Panel

  17. Annunciator PanelAvidyne Panel

  18. Avionics rheostat • Stby Nav Head internal lighting • Trim Master Switch • Audio Panel lighted buttons • Txp buttons • Autopilot buttons • Stby Att gyro ON switch • Stby instrument backlighting if aircraft electrical fails

  19. Annunciator Panel Day • Self dimming or bright override • Switch Panel lights • Self dimming • Night dimming • Gear down lights • PFD & MFD bezel button outlines • Speed Brakes

  20. PFD & MFD • Manual dimming by button at top right of unit • TXP display • Own photocell • GNS 430 • Auto-dimming by photocell?

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