Our vintage 747-200s have -
Three LTN-92 INS with two GPS update, and two FMS900 (Marconi)
Works great - Fully RNP-5 compliant -
Accuracy is equal as a brand new 2008 airplane would be.
xxx
Airplanes are going to be retired next month, Desert sands of Arizona...
They probably will sell these avionics.
I am retiring too. Beach sands of Brazil.
My avionics will be salvaged too when comes the time.
Heart, kidneys and eyes. Still good operating status for these items.
For the other thing, sorry, use Viagra, should you wish a transplant.
xxx
Happy contrails