[fanick]

Tangent to this: there was an airline accident when the service crew used transparent tape instead of the reflective silver tape somewhere on the belly of the plane (or wings, I don't remember). Then when the pilot was doing preflight inspection at night with a torchlight, the spot with the transparent tape was not visible to him. This was an error on the ground crew side.

It would need some googling to find the details.

[runarb]

Aeroperú Flight 603: "Flying over water, at night, with no visual references, the pilots were unaware of their true altitude, and struggled to control and navigate the aircraft. The investigation determined that the air data computers were unable to show correct airspeed and altitude on cockpit displays because a maintenance worker had failed to remove tape covering the pitot-static system ports on the aircraft exterior"

https://en.m.wikipedia.org/wiki/Aeroper%C3%BA_Flight_603