PPRuNe Forums - View Single Post - Manual Input Of RNP and UNABLE RNP Message

11th Dec 2010, 23:06

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NSEU

Join Date: Feb 2004

Location: Australia

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Manual Input Of RNP and UNABLE RNP Message

I've noticed whilst sitting at the gate, than I was unable to generate an ">UNABLE RNP" EICAS message (747-400) by manually entering an RNP smaller than the displayed ANP. I waited about a minute for the message to appear to see if there was a time delay for the message, but I imagine that you would want to see a message relating to this ASAP.

Would there be an air/ground inhibit on this message or something more specific? e.g. LNAV and/or VNAV arm/engage

Thanks.
Cheers
NSEU

Last edited by NSEU; 12th Dec 2010 at 01:46.

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