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Tcas System On A B737.  
User currently offlineHAWK21M From India, joined Jan 2001, 31875 posts, RR: 54
Posted (14 years 6 months 2 weeks 6 days 21 hours ago) and read 4758 times:

Can anyone explain the TCAS system operation on a B737.
If possible with the relationship of its components.

Think of the brighter side!
7 replies: All unread, jump to last
User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 24
Reply 1, posted (14 years 6 months 2 weeks 6 days 15 hours ago) and read 4721 times:

1 TCAS Computer,
Interface w/ Transponders Sys (Transponders, Ctrl panel), DADC Sys, Symbol Generator (EFIS), VSI (Non-Efis), IRU (Aircraft heading

TCAS interrogates the transonders of other Mode-S transponder equipped aircraft to determine/and avoid collison (Traffic Collision and Avoidance System). Since transponders get altitude info through interface w/DADC and Hdg from the IRUs, (not the only inputs) the interrogating TCAS computer can determine whether an aircraft is a threat. The interrogated aircraft then responds to the TCAS computer. TCAS, with its own interface with the IRU, knows where it is. If it is not a threat, TCAs will continue to keep and eye on the aircraft as long as it is within range. If it is a threat, TCAS will try to resolve the conflict. It resolves the conflict by displaying warnings on teh EADI and EHSI (EFIS) or the VSI and the Wxr Radar Display unit (Non_Efis). There are also aural warnings such as TRAFFIC, CLEAR OF CONFLICT, CLIMB, and DESCEND.

There is more to it, but that's TCAS in a nutshell.

Now having said that, there is no possible way in the world you are and Aircraft Maintenance Engineer. But before it sounds like I'm trying to make you look bad, can you please define and Aircraft Maintenance Engineers Responsibilties in India. I don't know everything by far, but there are just some things that Aircraft Maintenance Engineers SHOULD KNOW!! I'm not knocking you, but I'm just wondering......

Please respond, because I'm really curious as to what the title Aircraft Maintenance Engineer is equivalent to in the US

User currently offline737LAME From Norway, joined Apr 2001, 75 posts, RR: 4
Reply 2, posted (14 years 6 months 2 weeks 6 days 4 hours ago) and read 4698 times:

Hi Cdfmxtech,

Aircraft Maintenance engineer - AME
Licenced Aircraft Maintenance Engineer - LAME

Are equal to your

Aircraft Maintenance Technician - AMT
Licenced Aircraft Maintenance Technician - LAMT

As far as I know we in Europe use the therm LAME when you will use LAMT, and this is because the English way of describe the title.

I would add two TCAS antennas to your description,
One mounted on top of the fuselage, and one at the bottom.

By the way, HAWK21M, TCAS has been almost fully described in the TECH/OPs forum previously.


User currently offlineHAWK21M From India, joined Jan 2001, 31875 posts, RR: 54
Reply 3, posted (14 years 6 months 2 weeks 6 days 4 hours ago) and read 4705 times:

Let me Explain.
In India Aircraft Maintenance Engineering is divided into two streams

Any AME can be qualified in any one stream, after clearing a BAMEC [Basic Aircraft Maintenance Engineers certificate],thereafter obtaining required practical experience & clearing a type approved course,after a check by the DGCA officials our licence is endorsed in that category.

Mechanical covers category A thats Airframe [light], Airframe[heavy] and category C Piston engines & Jet engines.

Avionics covers category E electricals, category I instruments, Category R radio & cat X ie Avionics[EIR].

The reason I asked you the question was that TCAS is covered in Avionics stream.While I'm an A & C engineer.
I deal with Airframe & powerplant.Although I have adequate knowledge of Avionics its not my category of coverage.

Thats why I asked the question relationship with components,cause I wanted to check if the explanation I got from my Avioinics buddy is the same the world over as he was explaining about a 732 which had a TCAS system installed post Mid air collision near New delhi in the late 90s.[I'm sure you are aware of that].

I'm surprised that you concluded this way.I hope now you understood my question & the appropriate reason for asking it so specific.

I'm sure now you get the point.
Dont worry I don't mind the comment, cause its just that you didn't know the reason for my asking.

Just out of curiousity...In the US can you have a licence in both streams, the reason I ask this is cause you never thought it that way else the question would never have been asked.


Think of the brighter side!
User currently offlineHAWK21M From India, joined Jan 2001, 31875 posts, RR: 54
Reply 4, posted (14 years 6 months 2 weeks 6 days 4 hours ago) and read 4688 times:

Well in India...
Unlicenced personnel are called Aircraft Technicians.
Licenced Personnel are called AME [Aircraft Maintenance Engineers].

Cdfmxtech......Which category & aircraft are you licenced on.


Think of the brighter side!
User currently offlineDash8tech From Hong Kong, joined Jul 1999, 732 posts, RR: 5
Reply 5, posted (14 years 6 months 2 weeks 6 days ago) and read 4678 times:

In the US an A&P licensed AMT can work anything on the aircraft, airframe, powerplant, or avionics.

However, at some airlines they only require avionics techs to possess an FAA Repairman Certifcate which is issued to you after a certain amount of on the job training, a review of your background experience etc. This license does not go with you though like the A&P. Once you leave one airline you turn it in and apply again at the next.

A Repairman cannot work the airframe or powerplant with the exception of indicating and wiring etc.

This has the potential of becoming a bit confusing!


User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 24
Reply 6, posted (14 years 6 months 2 weeks 5 days 22 hours ago) and read 4677 times:

Hawk....my apologies if that may have come off as an insult. I hold the Title of a Licensed Aircraft Maintenance Technician (A&P Certificate) and have received formal training on multiple Boeing aircraft. Different airlines have different policies when it comes to what systems it's technicians work on and I am fortunate enough to work for one where we get involved in it all - from your airframe stuff (22, 27, 29, etc), powerplant stuff, to your avionics stuff (22, 24, 34, etc).
Now, there are also Aircraft Maintenance Engineers, which hold 2 seperate meaning depending on where you are in the world. Here in the US, it usually means the guy that studied for some kind of Aircraft Engineering degree. Rarely have I seen an engineer that actually came from the Line. These are the guys that are "supposed" to know systems very in depth. Usually the engineers will deal with a certain or multiple ATA chapters, but will generally understand most things.

So when I checked your profile and saw the post, I was thinking that maybe you were following along the lines of the "22 year old B777 pilots" that seem to be showing up on AirlinerCareerFantasies.net....where everyone is either a pilot or a 28 year technician, even if you haven't been to your prom. Thanx for clearing all that up!!


User currently offlineHAWK21M From India, joined Jan 2001, 31875 posts, RR: 54
Reply 7, posted (14 years 6 months 2 weeks 5 days 22 hours ago) and read 4672 times:

No probs cdfmxtech.
I'm glad I could prove myself.

I guess rules vary with different places.I'm surprised that licenced personnel on Mechanical stream can simultaneously work & certify on Avionics stream too.
One can work on both streams but not certify both where I come from.

I've elaborated on my profile to be more specific too.

I'm looking forward to attend a B737NG approved training soon,to add to my existing 732/733/734/735 licence.


Think of the brighter side!
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