That's why the lengths of lights, TDZ markings and such are
given, so you have a known standard with which to compare.


"Barry" wrote in message
. ..
| Nitpicking here, 91.175(c)(3) does not mention the
"rabbit" aka RAIL
| or Sequenced Flashers as an acceptable visual reference.
You can
| descend to 100' using the *approach lights* as a
reference...
| 91.175(c) was changed to make "the runway environment"
explicit.
| RAILs or SFs are not on the list.
|
| I disagree, 91.175 (c)(3)(i) says "the approach light
system" which certainly
| includes the sequenced flashers - see the AIM 2-1-1 which
states "Some systems
| include sequenced flashing lights".
|
| One important point that people often miss is that in
addition to seeing the
| lights, the pilot must have the required flight visibility
in order to
| continue the descent below DH. Since 100 feet above TDZE
on glideslope is
| only about 1000 feet from the threshold, if you can't see
the runway well
| before then, you probably don't have landing minimums, and
are not authorized
| to go below DH.
|
|