Just thought I'd throw out a point for contention. (As if any more are
needed)

The O2 sensor as used in a NB Speed Density system is of little value at the
power levels used in aircraft. My understanding is that the NB O2 sensor is
mainly an emissions device. 14.7 AFR is neither best power nor is it best
economy. What it is is best emissions when combined with the proper cat. All
NB Speed Density systems that I am aware of ignore the O2 sensor at full
power.

Removing the NBO2 sensor from the engines made perfect sense when taking the
operating environment into account. In this situation (as in the car when at
full power) the computer uses preprogrammed lookup tables based on operating
and environmental considerations. A properly tuned engine can and will make
full power without an NB O2 sensor. Nothing whatsoever is given up except
emissions, but since no cat...

The NB O2 sensor has nothing to do with making max power. So why include it
on an aircraft?

The NB O2 sensor has nothing to do with max economy. So why include it on an
aircraft?

A WB O2 sensor is a different story. And there are other compromises at play
that have not been addressed here.

Regards
Ken Bauman