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Trouble Shooting Aircraft Lighting

Trouble Shooting Aircraft Lighting

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Trouble Shooting Aircraft Lighting

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  1. Trouble Shooting Aircraft Lighting Landing and Taxi Lights Anti-collision Lights Navigation Lights Cockpit and Cabin Lights Instrument Panel Lights Click on a System Link to Start

  2. Choose Your Skill Level (click on link) • First Day • Entry level knowledge of electrical schematics and systems • Still Newbie • Practical experience with electrical schematics and systems • On My Own • Proficient in troubleshooting electrical systems

  3. Welcome! • Since this is your first day on the job, you will be working with Bob and can ask him whenever you need help. He is our senior technician. Give him a click and see what he has to say.

  4. Bob’s dialogue • “Hi, I’m Bob. Good to meet you. Looks like you and I are going to be working together. Well, hopefully I can teach you something. I have been here for 20 years now. Let me know if you have any questions or need a hand.”

  5. Your job task… • You need to click the clipboard to find out if there are any work orders. • You can also do a short tutorial to brush up on how to read schematics. You can access this anytime you see the image to the right.

  6. Work Order #05216 Click on Broken Landing Light Task to start troubleshooting!

  7. Diagnosing Tools • Remember, for each malfunction you have the choice of using three tools to help you diagnose the problem… • Multi-meter • Maintenance Manuals • Ask your co-worker, Bob

  8. Let’s get started. • You have your work cut out for you. Use the schematic to do your troubleshooting. When you think you have it fixed, click on the timer to stop the simulation and see if you made the correct decision. • Remember: You’re on the clock. A reasonable time for completing this troubleshooting project is 20 minutes so keep an eye on the stop watch. Time will start when click on your first troubleshooting choice.

  9. Landing/Taxi light SchematicPrint out this schematic to help keep track of your troubleshooting.

  10. Probable Causes • Your choices to check out… • Lights • Ground • Cockpit switch • Master Switch • Fuse • Battery • Use to return to this list of probable causes.

  11. Which tool would you like to use? Lights

  12. Lights • With the multi-meter, you can check two things… • Continuity across the light • Power on the output side of the light

  13. Lights • Continuity check is good. • What next?

  14. Lights • The multi-meter indicates zero volts on the output side of the light. • What next?

  15. Which tool would you like to use? Ground

  16. Ground • The multi-meter shows .000 ohms through the ground wire. • What next?

  17. Which tool would you like to use? Cockpit Switch

  18. Cockpit Switch • With the Master switch on, there is zero volts on the output side of the Cockpit Switch. • What next?

  19. Which tool would you like to use? Master Switch

  20. Master Switch • With the Master Switch on, there are 12 volts on the output side of the Master Switch. • What next?

  21. Which tool would you like to use? Fuse

  22. Fuse • With the multi-meter on audible tone, there is no signal heard when placed across the fuse. • What next?

  23. Which tool would you like to use? Battery

  24. Battery • The multi-meter shows 12 volts coming from the battery. • What next?

  25. “So you think you figured it out?” • From the choices below, which one did you determine to be the problem? • Bad battery • Faulty cockpit switch • Blown fuse • Bad element in the light • Faulty Master Switch • Bad ground

  26. Try again… • Sorry, but maybe you need to re-check the circuit.

  27. Good Job! • That’s right. This landing light doesn’t work because of a blown fuse. • How did you do? Remember your time to shoot for was 20 minutes. If you’ve finished in less time try using this simulation at one of the higher experience levels.

  28. Good Job! • Well, looks like you are well on your way. Good work!

  29. Bob’s Tips • “Commonly when troubleshooting electrical systems, it is usual to start with the simplest component.” Go back

  30. Bob’s Tips • “It’s always a good idea to take a look at the maintenance manuals for guidance. You’re multi-meter is the best tool for determining the integrity of the circuit, especially the grounds.” Go back

  31. Bob’s Tips • “Remember, to check for power, you need to make sure the switches are turned on. To check for continuity the switches should be off and each segment of the circuit isolated.” Go back

  32. Bob’s Tips • “Looks like the element in the landing light is not burned out. I’d look to see if it also has continuity.” Go back

  33. Bob’s Tips • “Even though the multi-meter shows a good ground connection, it’s always a good idea to go out and actually check it with your own eyes.” Go back

  34. Bob’s Tips • “Make sure you took the reading with the multi-meter while both switches were on. If the cockpit switch was the only one on, than continuity is all that could be checked.” Go back

  35. Bob’s Tips • “By determining that the voltage on the output side of the Master Switch is what it should be, you also proved that the battery is not at fault.” Go back

  36. Bob’s Tips • “Ah ha. Just to be sure, I would double check this by switching the multi-meter to a digital read out and see what you get. You can always go out to the bird and check it out yourself.” Go back

  37. Bob’s Tips • “Ok, you know your battery is good. Looks like you’re going to have to chase the lines.” Go back

  38. Reading Schematics Tutorial Back to the simulation.

  39. Power (Voltage) • Master Switch On • Battery Voltage • Wire connection • Cockpit Switches On • Battery Voltage • Wire Connection • Fuse • Battery Voltage to and through Lights • Switches closed • Grounding • Battery Voltage • Wire Connection • Inline Connectors Return to tutorial title page

  40. Electrical Grounding • Correctly grounded circuit • Inline connectors secure • Corrosion • Electrical shorting • Poor connections/wire termination • Lights grounded to each other • Wire Connections • Grounded to airframe • Return to tutorial title page

  41. Components • Wire • Capabilities • Correct rating and type • Continuity • Shorting • Corrosion • Insulation • Shorting • Corrosion • Routing • Shorting • Return to tutorial title page

  42. Components cont. • Switches • Continuity • Wire termination • Inline connectors • Corrosion • Wire termination • Return to tutorial title page

  43. Components Cont. • Wire terminal connections • Size • Crimp • Technique • Light Bulbs • Continuity • Wire termination • Corrosion • Capabilities • Rating and type • Return to tutorial title page