Former airline pilot & flight engineer (“F/E”) …
Pretty much as folks above said.
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Very few F/E equipped airplanes are still in use. And of those still flying, the vast majority are in the cargo biz. And concentrated in the primitive or poorer parts of the world.
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In about 1965 the FAA mandated that all flight engineers of US commercial passenger planes be pilots. Prior to that it was a separate career growing out of aviation maintenance technician.
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Since then, in US passenger service the F/E has been a stepping-stone position to co-pilot & eventually Captain. So the F/E would have been hired by an airline with the expectation that he/she would be a co-pilot some day and would therefore have come to the new job with suitable experience as a military or civilian professional pilot.
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Typical new-hire training for F/Es contains a bit of hands-on flying the sim, but just a taste. And pretty much no such followup training is done later. So somebody who’d been F/Eing for years would be pretty rusty at steering even though he/she was utterly familiar with the machine and the “script” for flying & landing it.
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US freight and non-US carriers follow their own regs. In many cases that means the F/E has never flown any airplane, much less the 747-300 or 727 he’s strapped into. Some of those guys are real interested in flying & other are just mechanics / switch flippers.
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Prior to about 2007, the mandatory retirement age for US airline pilots was 60. It’s now 65. There is no mandatory retirement age for F/Es. During the 1970s-90s, when F/E-equipped airplanes were common, many airlines had programs where when a Captain turned 60, rather than retiring he (always a he in those days) could become a flight engineer & continue working. For round numbers F/E pay is about 1/2 Captain pay, but for somebody whose finances were devastated by a couple divorces or a few layoffs over a long career, it was a job. So if you were riding in a A-300, 747, DC-10, or L1011 back in those days, you had a decent chance of having an F/E who’d been a Captain for years, probably on the same type.
Bottom line: nowadays this is 99% moot. But … If you somehow find yourself as a passenger on an F/E-equipped airplane today, the odds are real high the F/E is not a pilot & wouldn’t be a real good one in a pinch.