Originally Posted by
UAFAM
“What you’re actually seeing is a heavy-duty aluminum bonding tape known as ‘speed tape,’” explains airline pilot Patrick Smith on his Ask The Pilot website. “It’s a temporary fix and it’s used only on superficial or noncritical components, until more substantive repairs are made later on.”
It also, at least IIRC from a conversation I had with a MD-10 owning client a while back, is
really expensive, even for aviation where things already cost insane amounts compared to the "real world" due to the testing/certification/flammability/etc. requirements
ETA: Just Googled it to check my memory. Grainger has a case of 36 rolls of 1" wide by 36 yard long 3M 363 tape (confirming to FAR 25.853(a) and MIL-T-83284) for $7,126.20 = $197.95/roll or $1.83/foot