Originally Posted by
MechEngr
It looks like BA installed a useful and fit-for-purpose, but not yet approved.
My understanding was that it was sensors used by the HGS, not the HGS as a whole.
The new (upgraded) sensors had not completed all the paperwork to allow installation on the 737.
All the testing was done, just not the paperwork exercise.
I haven't seen a good discussion about where that fell short. Did Collins say the new sensors were approved and someone just missed that it only for use with the HGS and not for the specific airframe? Did someone say that it was approved when it wasn't?