Troubleshoot and rectify an inoperative navigation light

You are an avionics trade assistant working toward your licence.

Simulated workplaceIntermediate missionCAQA AeroTech Maintenance

What is going on

Coral Coast Air Charter's twin piston aircraft VH-CCX has a left navigation light reported inoperative on a night pre-flight check, logged as DEF-26-0412 with work order WO-26-1184 raised. The aircraft has a night charter on Friday. Ahmed Farouk wants a logical troubleshooting sequence from the wiring diagram, starting with the lamp and working back through the connector, wiring, switch and circuit breaker, with every test and result recorded. The bench multimeter MM-008 is withdrawn for overdue calibration, so a calibrated meter must be drawn from the register, and any part fitted must come from the bonded store with its batch recorded.

Ahmed Farouk, Avionics Supervisor
Subject: Troubleshoot the navigation light on VH-CCX

Coral Coast reported the left navigation light inoperative on VH-CCX and the aircraft has a night charter on Friday. Work order WO-26-1184 is raised and defect DEF-26-0412 is open. Please troubleshoot it properly using the wiring diagram: lamp, connector, wiring, switch and circuit breaker, in that order. Use a calibrated multimeter from the bench, not the one that has been withdrawn. Record each test and result on the work order, fit parts from store with the batch number recorded, and do the functional check. I will inspect and certify.

Your brief

Troubleshoot the navigation light circuit using the approved wiring data and calibrated test equipment, rectify the fault with correctly documented parts, perform the functional check and record the work for inspection and certification.

Work through it

You do not need to do it all. Doing a few of these will show you what the work is like. Your ticks and notes stay on this device.

Read the Defect Reporting and Deferral Procedure and the certification procedure and confirm what must be recorded for a defect rectification.
Sign out a calibrated multimeter from the Tool Control and Calibration Register, checking the label and due date, and note why MM-008 must not be used.
Locate the navigation light circuit in the wiring diagram and write a troubleshooting sequence with the expected reading at each test point.
Isolate the circuit safely, then test the lamp, connector, wiring continuity, switch and circuit breaker in sequence, recording each measurement on the work order.
Identify the fault, draw the replacement part from the Parts and Bonded Store Register with the batch number recorded against the work order, and fit it to the approved data.
Perform the functional check with the aircraft power applied safely, record the result and update DEF-26-0412 with the fault found and the rectification.
Return the multimeter, record the tool check and present the work order to Ahmed Farouk for inspection and certification.

My notes: what did I enjoy, and what surprised me?

What someone in this role would produce

Troubleshooting sequence with readings
Work order record with parts and batch
Updated defect log entry
Tool sign out and return record

Printing this is a record of what you explored. It is not a certificate or a qualification.