TA/RA
Thread Starter
Join Date: Dec 2005
Location: Some where over the rainbow
Age: 37
Posts: 223
Likes: 0
Received 0 Likes
on
0 Posts
TA/RA
after long study i have finally found out what TA/RA stands for, although i have still got a question.
why is there an option to only have TA or RA respectivly when surely TA/RA should be selected all the time.
why is there an option to only have TA or RA respectivly when surely TA/RA should be selected all the time.
Join Date: Jan 2002
Location: Europe
Posts: 31
Likes: 0
Received 0 Likes
on
0 Posts
The NON NORMAL 737 Checklist ask for TA for 1 Engine INOP flight
TRANSPONDER MODE SELECTOR . . . . . . . . . . . . . .TA ONLY
[Prevents climb commands which can exceed single engine performance
capability.]
This should be one of the reasons I guess.
Regards
TRANSPONDER MODE SELECTOR . . . . . . . . . . . . . .TA ONLY
[Prevents climb commands which can exceed single engine performance
capability.]
This should be one of the reasons I guess.
Regards
The Reverend
Join Date: Oct 1999
Location: Sydney,NSW,Australia
Posts: 2,020
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by pilotho
after long study i have finally found out what TA/RA stands for, although i have still got a question.
why is there an option to only have TA or RA respectivly when surely TA/RA should be selected all the time.
why is there an option to only have TA or RA respectivly when surely TA/RA should be selected all the time.
TA/RA is the normal operating mode and provides Traffic Advisories and Resolution Advisories.
TA provides Traffic Advisories only; no Resolution Advisories are issued. This mode prevents TCAS from issuing RAs when the aircraft is intentionally flying close to another aircraft such as closely spaced parallel approaches.
At Radio Altitudes less than 900 ft AGL descending or less than 1,200 ft AGL climbing, TCAS will be silent below these inhibit altitudes and is in TA ONLY mode. No RAs will be displayed, TAs will be displayed on the VSI/TRA but no "TRAFFIC - TRAFFIC" message will be heard. If an RA is active when the aircraft passes into the inhibited radio altitude, the RA (red square) will transition to a TA (amber circle) any red or green arcs displayed will be removed, no "CLEAR OF CONFLICT" message will be announced.
Join Date: Jan 2002
Location: Europe
Posts: 31
Likes: 0
Received 0 Likes
on
0 Posts
Here is also a good summary concerning the TCAS mode control :
http://www.757.org.uk/767/systems/sys2.html
TCAS is normally operated in the TA/RA (TA and RA) mode. Sometimes it may be necessary to operate in the TA Only mode to prevent undesired RAs.
The TA Only mode is used during engine out operation to prevent RAs when inadequate thrust is available to follow the RA commands. Also, it may be used when intentionally operating near other aircraft that may cause RAs, such as during parallel approaches and VFR operations.
http://www.757.org.uk/767/systems/sys2.html
TCAS is normally operated in the TA/RA (TA and RA) mode. Sometimes it may be necessary to operate in the TA Only mode to prevent undesired RAs.
The TA Only mode is used during engine out operation to prevent RAs when inadequate thrust is available to follow the RA commands. Also, it may be used when intentionally operating near other aircraft that may cause RAs, such as during parallel approaches and VFR operations.
Join Date: Nov 2004
Location: Here, there, and everywhere
Posts: 1,125
Likes: 0
Received 13 Likes
on
8 Posts
Originally Posted by HotDog
TA provides Traffic Advisories only; no Resolution Advisories are issued. This mode prevents TCAS from issuing RAs when the aircraft is intentionally flying close to another aircraft such as closely spaced parallel approaches.
