On Mar 11, 8:02 pm, Bob Noel
wrote:
In article ,

Newps wrote:
Capt.Doug wrote:

"Newps" wrote in message The TCAS is real, you are required to follow the

RA.

RAs are inhibited below a certain altitude in landing mode.

Yes, I was aware of that. What is that altitude on say an ILS? Is that
altitude an FAA mandated altitude, the TCAS manufacturers preset specs
or a company ops spec?

The RA and TA inhibits are specified in the AC for TCAS (AC 20-151)

INHIBIT PARAMETERS

Increase Descent RA Inhibited below 1650 ft AGL while climbing and
inhibited below 1450 ft AGL while descending.

Descend RA Inhibited below 1200 ft AGL while climbing and
inhibited below 1000 ft AGL while descending.

TA Voice Messages Inhibited below 400 ft AGL while descending and
inhibited below 600 ft AGL while climbing.

RAs Inhibited below 1100 ft AGL while climbing, and
inhibited below 900 ft AGL while descending.
(TCAS automatically reverts to TA only).

Self-Test Can be inhibited when airborne.

Advisory Priority Automatically reverts to TA ONLY when higher
priority advisories (such as GPWS/TAWS and
Windshear) occur.

Climb RA Can be inhibited, based upon aircraft performance
capability.

Increase Climb RA Can be inhibited, based upon aircraft performance
capability.

--
Bob Noel
(gave up lookingn for a particular sig the lawyer will)

Bob, thanks for pointing all of this out.I think Newps was asking more
in a retorical sense because an inhibited RA does not really apply to
this story.
Imagine that if the A340 crew never joined the LOC then they would not
have started a desent.This would put them at 1500 to 1700 AGL (typical
for a vector on to final from the north in LAX).Now if they passed 200
feet below (The aleged) Captain Doug's budy that would put his budy at
1700 to 1900 AGL (Aprox), so an inhibited RA would be a mute point.