ECON cruise, LR cruise...
Join Date: Apr 2002
Location: MIRSI hold - give or take...
Age: 52
Posts: 568
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PL21 without ADIRUs... now, I wouldn't exactly call what we have a powerful suite, raw-data tracking is wobbly at best, and VNAV function is strictly geometrical (ie no use except for approach). Add the archaic nav-source set-up (no imbedded LNAV) and you have a pretty mediocre system.
Throwing in 2 ADIRUs might help in some aspects, but it won't give you propper VNAV. Menu architecture is good, tho - and that, combined with AFCS integration, will at the end of the day decide if the 3000 is as good as the 21. Lack of ADIRU capability is - probably - a secondary factor only.