Originally Posted by
rjacobs
I think almost every NDB is decommissioned now. Its been removed from all the airplanes at my airline/rendered inop.
VOR's I think are going to go that way soon.
We basically only use GPS as an update to the inertial reference unless we are flying GPS or RNP approaches... So even with a GPS outage we could still operate. I think the IRS is considered within acceptable tolerances for 18 hours in between updates. Obviously you are losing some precision, but not to much.
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