American Airlines Logo Light

Team members required:

One

Description:

Competitors will troubleshoot electrical Harness of an inoperable logo light

References:

Fluke 77/75/23/21 Series III Multimeter Instruction Sheet

Electrical schematic (provided at the event)

Tools and equipment list:

Digital Fluke Multimeter with leads

Cannon plug pliers with grips (ATI508KG)

Instructions:

1. 1. Deactivate logo light system Select LOGO LIGHT SWITCH TO OFF, PULL AND COLLAR LOGO LIGHT CIRCUIT BREAKER.
   2. Remove electrical wiring harness.
   3. With electrical schematic and multimeter provided, perform the following wire checks to determine the status of each wire of the electrical logo light harness (These are the possible condition resistance, continuity, Open.)
   4. Find the wire termination data. Refer to the WDM.

WARNING: EACH CONNECTOR ON THE CIRCUIT THAT MUST HAVE A TEST MUST BE DISCONNECTED. IF THE CONNECTORS ARE NOT DISCONNECTED, UNSATISFACTORY RESISTANCE INDICATIONS OR DAMAGE TO THE CONNECTOR CAN OCCUR.

WARNING: DO NOT BEND OR PUT STRESS ON THE CONTACTS. DAMAGE TO THE CONNECTOR OR THE CONTACTS CAN OCCUR.

1. 1. 1. Wire Continuity / Resistance Check
         1. Select multimeter.

WARNING: DO NOT USE A MEGOHMETER FOR THE INSULATION RESISTANCE TEST OF THE ON-WING WIRING REPAIR. INJURY TO PERSONNEL OR DAMAGE TO THE AIRPLANE CAN OCCUR.

1. 1. 1. 2. Set the meter to the proper selection.
         3. Attach one meter test lead to WIRE PIN 1 on the “A” connector plug assembly.

WARNING: DO NOT BEND OR PUT STRESS ON THE CONTACTS. DAMAGE TO THE CONNECTOR OR THE CONTACTS CAN OCCUR.

1. 1. 1. 4. Check continuity on all pins on the “B” plug.

WARNING: DO NOT BEND OR PUT STRESS ON THE CONTACTS. DAMAGE TO THE CONNECTOR OR THE CONTACTS CAN OCCUR.

1. 1. 1. 5. Using the wiring diagram and the meter readings to record any discrepancies/faults found.

NOTE: Use the discrepancy codes that are listed on the score sheet to describe the faults that are found in the harness. Which plug (A or B) and which pin (1 thru 7) with the corresponding code (1 thru 3) Example: (A5 to B3 #3, Plug A Pin 5 to Plug B pin 3 fault #3 CONTINUITY)

1. 1. 1. 6. Repeat steps c) through e) for the remaining WIRE PIN contact on the “A” connector plug.

1. 1. 1. 7. Attach one meter test lead to WIRE PIN 1 on the “B” connector plug assembly.

WARNING: DO NOT BEND OR PUT STRESS ON THE CONTACTS. DAMAGE TO THE CONNECTOR OR THE CONTACTS CAN OCCUR.

1. 1. 1. 8. Check continuity on all pins on the “A” plug.

WARNING: DO NOT BEND OR PUT STRESS ON THE CONTACTS. DAMAGE TO THE CONNECTOR OR THE CONTACTS CAN OCCUR.

1. 1. 1. 9. Using the wiring diagram and the meter readings to record any discrepancies/faults found.

NOTE: Use the discrepancy codes that are listed on the score sheet to describe the faults that are found in the harness. Which plug (A or B) and which pin (1 thru 7) with the corresponding code (1 thru 3) Example: (A5 to B3 #3, Plug A Pin 5 to Plug B pin 3 fault #3 CONTINUITY)

1. 1. 1. 10. Repeat steps g) through i) for the remaining WIRE PIN contact on the “B” connector plug and record any discrepancies/faults found.

1. 1. 2. Plug Integrity check.
         1. Attach one meter test lead to WIRE PIN 1 on the “A” connector plug assembly.
         2. Connect the other meter test lead to all other WIRE PIN contacts on the “A” connector plug.
         3. Using the wiring diagram and the meter readings to record any discrepancies/faults found.

NOTE: Use the discrepancy codes that are listed on the score sheet to describe the faults that are found in the harness. Which plug (A or B) and which pin (1 thru 7) with the corresponding code (1 thru 3) Example: (A5 to B3 #3, Plug A Pin 5 to Plug B pin 3 fault #3 CONTINUITY)

1. 1. 1. 4. Repeat steps a) through c) for the “B” connector plug and  record any discrepancies/faults found.

WARNING: DO NOT BEND OR PUT STRESS ON THE CONTACTS. DAMAGE TO THE CONNECTOR OR THE CONTACTS CAN OCCUR.

1. 1. 3. Back shell Check
         1. Attach one meter test lead to the back shell of plug A  using the alligator clip
         2. Attach the other meter test lead to each pin on the same connector plug.
         3. Read the meter. Make sure that the resistance shown on the meter is open or 100 megohms.
         4. Repeat steps a) through c) for the back shell on plug B.
      4. Record PASS or FAIL on the work sheet.

1. 5. Replace harness with new one provided BY THE JUDGE
   6. Reactivate Logo light system.
   7. Verify Logo light operates.
   8. Return tools to the original location.

There will be a bonus questions on the work sheet that can be answered for a time deduction if the contestant chooses to with the time remaining.

Scoring:

Scores will be calculated according to the AMC score sheet. Additional penalties may be assessed for any incorrect recordings of wire status.