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The Boeing Company Fiber Optics Advanced Troubleshooting

Monday, April 12, 2027
to Thursday, April 15, 2027
Event Score Sheet

Competitors Required:

1

Description:

Troubleshoot the weather radar system; identify the fault in the left or right ISS and use the procedures to clear the fault.

References:

787 Maintenance Message 34-60121

Tools, Equipment, and Materials Provided:

Fiber optic inspection scope

fiber optic cleaning pen

cotton swabs

cleaning wipes

small screwdriver

5/64 hex wrench

3/32 hex wrench

9/64 hex wrench.

 

Snap-on provided tooling (qty one in each of two pallets unless otherwise indicated): None

Procedures:
  1. Start time.
  2. Power aircraft (PowerPoint procedures)
  3. Test WXR L and R (“WXR FAIL” is illuminated in amber, but does not specify) (DMC-B787-A-34-42-00-21A-320A-A)
  4. Identify faulty side (verbal confirmation)
  5. Once identified, tag out faulty system (ISS L or ISS R)

Action/Condition: Open these circuit breakers and lock with DO NOT CLOSE tags with applicable reasons:

Panel

Designation

CB

Location

CIRCUIT BREAKER INDICATION AND CONTROL, CBIC

ISS-L 

CE3442402 

 

ISS-R 

CE3442404 

 

  1. Removed faulty fiber optic cable assy from WXR drive unit

WARNING:

DO NOT LOOK INTO THE END OF A FIBER-OPTIC CABLE. THERE IS A RISK OF LASER RADIATION, WHICH YOU WILL NOT SEE. LASER RADIATION IS DANGEROUS FOR YOUR EYES.

    1. Perform FO inspection procedures (verbal confirmation)

CAUTION:

DO NOT TOUCH THE CONNECTOR PINS, OR OTHER CONDUCTORS. IF YOU TOUCH THESE CONDUCTORS, ELECTROSTATIC DISCHARGE CAN CAUSE DAMAGE TO THE COMPONENTS.

    1. Perform FO cleaning procedures (verbal confirmation)

CAUTION:

DO NOT PULL OR TWIST THE FIBER-OPTIC CABLE WITH A STRONG OR A SUDDEN FORCE. DAMAGE TO THE CABLE OR THE CONNECTOR CAN OCCUR.

    1. Reinstall removed FO cable assy
    1. Reset CB on tagged-out system
    2. Perform WXR test on side that was faulty
    3. Visually inspect WXR test on display and ensure test is complete and shows no faults
    4. If no faults are present, restore aircraft to original config, check for FOD, and perform tool accountability.
    5. Stop Time.

CAUTION:

DO NOT BEND THE FIBER-OPTIC CABLE MORE THAN THE MINIMUM BEND RADIUS. THE CABLE IS EASILY DAMAGED.

CAUTION:

INSTALL THE PROTECTIVE CAPS IMMEDIATELY AFTER YOU DISCONNECT THE CABLE. IT IS EASY TO CAUSE DAMAGE TO THE FIBER-OPTIC CABLE.

Event Score Sheet

For More Information:

Jonathan Henry

The Boeing Company

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(305)786-1641