What are common signs of a failed uplock indicator?

• A. Consistent down-lock indication, nuisance warnings when gear is down, or doors not mispositioned.
• B. Inconsistent down-lock indication, nuisance warnings when gear is down, or inability to properly extend/retract due to uplock mispositioning.
• C. The gear never extends.
• D. The aircraft's landing gear doors automatically close.

Answer: (B)

Uplock indicators provide feedback on whether the uplock mechanism is in the correct position to hold the gear up and that the gear down/lock status is reliable. When this indicator fails, the feedback can become unreliable. The most telling signs are an inconsistent down-lock indication (the system may show the gear as down-locked at times when it isn’t, or vice versa), nuisance warnings or caution messages when the gear is down, and in some cases an actual impediment to movement where the uplock mispositioning prevents the gear from extending properly or retracting cleanly. These symptoms reflect a fault in the feedback and positioning system, not just a normal gear operation or a separate door issue. The other scenarios describe conditions that aren’t typical indicators of uplock feedback failure—either a consistent and correct indication, a purely mechanical failure of the gear not extending, or door operation behavior unrelated to the uplock signaling.