B777 skipping the flap positon while extending
Having been involved with 6 different 777 operators on 200ER, 300 & 300ER their Limitations restricted Autolands to F20/30, however this is not to say that F25 Autoland certification trails have not been carried out, maybe a Boeing engineer can give input, I assume that any certification for an Autoland flap setting will involve many landings at different weight/wind/CG limits, F20/30 would normally give an operator sufficient options...
Join Date: Jul 2012
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At my carrier, some of our -300ERs are certified for Flap 25 autoland and others are not. None of our 200/300s are. Of course, as mentioned above, the non-certified ones still seem to manage it just fine on occasion 
Join Date: Jun 2014
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Yes the system will let you. Point of note - the NPs in the FCOM state you wait for the correct flap icon to display on the speedtape before selecting the next flap position. Reference the flap retraction and extension schedules in the NPs.
