Paul Lynch wrote:
One addition to other posters comments on going below DH. You can go below
DH without having the runway in sight if you have the runway environment
(approach lighting system) is sight. You are authorized (91 and 135) to 100
feet. At 100 feet you must have the runway (which can mean only the end
lights of the runway) in sight.

Our FSDO operations inspector wants us to set 100 feet on the radar
altimeter because that is the absolute lowest you can go on a typical
approach. Many pilots prefer the DH AGL altitude set on the radalt.

Alas, so many FSDO inspectors do not really understand the regulations
and they refuse to use FAA headquarters resources that are there to
"assist."

If your inspector went to AFS-410 (All-weather ops branch) and told them
what he is recommending, they would tell him that he is, in effect,
creating a second DA, which is contrary to the minimums in the SIAP.