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Is the RAT pump standard or optional on the A320 aircraft? What about the B737?

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    $\begingroup$ What RAT "pump"? The RAT is an electrical generator, not a pump, are you asking about a supplemental hydraulic system? Or the Ram Air Turbine generator? $\endgroup$
    – Ron Beyer
    Sep 7 '16 at 1:24
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    $\begingroup$ Depending on the system or a/c RATs drive both an AC generator and a hydraulic pump. $\endgroup$ Sep 7 '16 at 2:57
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A RAT is never an optional piece of equipment. It is only there because the design of the aircraft systems require it in order for the aircraft to meet airworthiness certification.

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The B-737 does not have a RAT.

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  • $\begingroup$ I can find examples of dual-engine failure in a 737 (e.g. TACA 110) which is a fairly desperate situation, but none where both engines and the APU have failed in a 737 (e.g. due to fuel shortage as per Gimli 767) - I guess that would mostly be fatal in a 737. $\endgroup$ Sep 7 '16 at 11:00
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    $\begingroup$ @RedGrittyBrick It would be a really bad day, but you'd have the battery for electrical systems, and hydraulics from the engines windmilling, and manual reversion on the flight controls (no fly-by-wire). So not necessarily unsurvivable. But any time you lose both motors, things are pretty bad! $\endgroup$
    – Ralph J
    Sep 7 '16 at 11:17
  • $\begingroup$ Due to a faulty battery Garuda 421 had also the APU down. $\endgroup$
    – mirh
    Apr 18 '19 at 18:19

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