PhantomTweak
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Yep, but they were clearly marked with "collars" around the button on top. They were normally pulled during shut-down by the RIO, but I would think in the case of a Hollywooder (is that a word?) the breakers would be pulled after shut-down by a plane captain, or even an E-Tech, leaning head-down into the cockpit. May look a bit odd, to an outsider, to see a tweak head-down in the aft-cockpit, especially with a guy sitting there. But we did what we had to to get the job done. We just prayed to whatever gods there are that no-one got anywhere near the pretty black-and-yellow handles when we were like that. We would bring a pin for the lower handle, and slip it in to prevent, hopefully, any accidents. The PC would come behind us and ensure the breakers were set and the pins pulled. Woe be unto the tweak who left the lower handle pinned when they climbed back out, too!Correct, and some had to be pulled prior to starting the jet.

Sometimes, you would even have to do that with a real RIO in the back seat. If a system failed during start-up checks, they would call a tweak. First thing, after ensuring the seat was pinned, was to dive head first into the area in front of the seat to check for popped/unreset breakers. Often, all it took was to reset them. If that wasn't it, we had to determine if it was a downing gripe, or not. They didn't like us when we said it was a down aircraft. Obviously, if it happened in-flight, the GIB had to reset them himself. They never perfected the inflatable tweak they could keep handy...

Have fun all!
Pat☺