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For an Airbus A330 in emergency electrical configuration with both generators and APU FAIL (both engines working), why does the checklist ask you to select RAT MAN ON before slat extension and then LAND REC ON?

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  • $\begingroup$ Do you understand what each of those steps accomplishes? What in that sequence seems unintuitive to you? $\endgroup$ – Ralph J Jun 1 at 12:18
  • $\begingroup$ Because when APU and ENG GEN are not working then you have to find an alternative source of electrical power: the RAT. The RAT is a small propeller under the belly of the plane that rotates due to the wind generated by the plane moving through the air. The RAT will deliver power to flight computers in order to send commands to control surfaces (primary and secondary) $\endgroup$ – Afe Jun 1 at 15:56
  • $\begingroup$ as suggested by @RalphJ, you should explain why you think this should be ordered differently or if you think the order does not matter and thus ask why this order and not the other. $\endgroup$ – Manu H Jun 1 at 17:09
  • $\begingroup$ Ralph J ...The question here is WHY DO YOU PUT RATMAN ON BEFORE SLAT EXT ? in this Senario the EDPs are working it’s only the two GEN s and APU that’s US so the EDPs are powering the green system to power the Emergency Gen so if the Emergency gen is running why do you need the RAT ?? $\endgroup$ – Kumar Jun 3 at 0:03
  • $\begingroup$ Ralph J ...The question here is WHY DO YOU PUT RATMAN ON BEFORE SLAT EXT ? in this Senario the EDPs are working it’s only the two GEN s and APU that’s US so the EDPs are powering the green system to power the Emergency Gen so if the Emergency gen is running why do you need the RAT ?? $\endgroup$ – Kumar Jun 7 at 10:32

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