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Landing and Taxi LightsAnti-collision Lights
Navigation LightsCockpit and Cabin LightsInstrument Panel Lights
Click on a System Link to Start
Choose Your Skill Level (click on link)
First DayEntry level knowledge of electrical schematics
and systemsStill Newbie
Practical experience with electrical schematics and systems
On My OwnProficient in troubleshooting electrical systems
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.
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.”
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.
Work Order #05216Click on Broken Landing Light Task to start troubleshooting!
Diagnosing ToolsRemember, 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
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.
Landing/Taxi light SchematicPrint out this schematic to help keep track of your troubleshooting.
Master
25A
TAXI LTLDG LTCockpit SwitchCockpit Switch
+ BAT12V
Probable CausesYour choices to check out…LightsGroundCockpit switchMaster SwitchFuseBattery
Use to return to this list of probable causes.
Master
25A
TAXI LTLDG LTCockpit SwitchCockpit Switch
+ BAT12V
Lights
Master
25A
TAXI LTLDG LTCockpit SwitchCockpit Switch
+ BAT12V
Which tool would you like to use?
LightsWith the multi-
meter, you can check two things…Continuity across th
e lightPower on the output
side of the lightMaster
25A
TAXI LTLDG LTCockpit SwitchCockpit Switch
+ BAT12V
Lights
Master
25A
TAXI LTLDG LTCockpit SwitchCockpit Switch
+ BAT12V
Continuity check is good.
What next?
LightsThe multi-meter
indicates zero volts on the output side of the light.
What next?Master
25A
TAXI LTLDG LTCockpit SwitchCockpit Switch
+ BAT12V
Ground
Master
25A
TAXI LTLDG LTCockpit SwitchCockpit Switch
+ BAT12V
Which tool would you like to use?
GroundThe multi-meter
shows .000 ohms through the ground wire.
What next?
Master
25A
TAXI LTLDG LTCockpit SwitchCockpit Switch
+ BAT12V
Cockpit Switch
Master
25A
TAXI LTLDG LTCockpit SwitchCockpit Switch
+ BAT12V
Which tool would you like to use?
Cockpit SwitchWith the Master
switch on, there is zero volts on the output side of the Cockpit Switch.
What next?Master
25A
TAXI LTLDG LTCockpit SwitchCockpit Switch
+ BAT12V
Master Switch
Master
25A
TAXI LTLDG LTCockpit SwitchCockpit Switch
+ BAT12V
Which tool would you like to use?
Master SwitchWith the Master
Switch on, there are 12 volts on the output side of the Master Switch.
What next?
Master
25A
TAXI LTLDG LTCockpit SwitchCockpit Switch
+ BAT12V
Fuse
Master
25A
TAXI LTLDG LTCockpit SwitchCockpit Switch
+ BAT12V
Which tool would you like to use?
FuseWith the multi-meter
on audible tone, there is no signal heard when placed across the fuse.
What next?
Master
25A
TAXI LTLDG LTCockpit SwitchCockpit Switch
+ BAT12V
Battery
Master
25A
TAXI LTLDG LTCockpit SwitchCockpit Switch
+ BAT12V
Which tool would you like to use?
BatteryThe multi-meter
shows 12 volts coming from the battery.
What next?
Master
25A
TAXI LTLDG LTCockpit SwitchCockpit Switch
+ BAT12V
“So you think you figured it out?”From the choices below, which one did you
determine to be the problem?
Bad batteryFaulty cockpit switchBlown fuseBad element in the lightFaulty Master SwitchBad ground
Try again…Sorry, but maybe you need to re-check the circuit.
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.
Good Job!Well, looks like you
are well on your way. Good work!
Bob’s Tips“Commonly when
troubleshooting electrical systems, it is usual to start with the simplest component.”
Go back
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
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
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
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
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
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
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
Bob’s Tips“Ok, you know your
battery is good. Looks like you’re going to have to chase the lines.”
Go back
Tutorial
Back to the simulation.
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
Electrical GroundingCorrectly 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
Components• Wire
– Capabilities• Correct rating and type
– Continuity• Shorting• Corrosion
– Insulation• Shorting• Corrosion
– Routing• Shorting
Return to tutorial title page
Components cont.Switches
ContinuityWire termination
Inline connectorsCorrosionWire termination
Return to tutorial title page
Components Cont.• Wire terminal connections
– Size– Crimp
• Technique
• Light Bulbs– Continuity
• Wire termination• Corrosion
– Capabilities• Rating and type
Return to tutorial title page
Components cont.Fuse
Capabilities Correct rating and type
ContinuityCorrosion
Return to tutorial title page
ContinuityComplete circuit through the item being
testedShorts present in the circuit
Breaks in circuit to groundBreaks in circuitCorrosion
Dissimilar metal corrosionMoisture
Return to tutorial title page
Battery VoltageServiced battery
Electrolyte levelCell integrity
Connected into circuitCrimp/solder fittingsCorrosion
Return to tutorial title page
GroundingWire termination to airframe
Crimp/solder fittingsContinuityShortsBreaks
Return to tutorial title page
Possible problems• Bulb burned out• Battery not properly serviced, turned on or installed• Master switch not turned on • Cockpit switches not turned on• Fuse blown, circuit breaker popped or broken• Wires broke, shorted, disconnected, improperly
routed• Circuit is not continuous
– Breaks, shorts, corrosion or wire connections not connected
• Improper circuit grounding• Switch failure• Operator error
Return to tutorial title page
Possible corrections• Replace bulb• Service, turn on or install battery• Turn on master switch• Turn on cockpit switches• Replace fuse, reset or replace circuit breaker• Install, connect, properly route wires• Troubleshoot Circuit with multi-meter for
– Breaks, shorts, corrosion or wire connections not connected and correct
• Properly ground the circuit• Verify switch operation and replace if necessary• Operate circuit correctly
Return to tutorial title page
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