Sponsor Message:
Aviation Technical / Operations Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
B757 Zone/Duct Temp Indication  
User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 27
Posted (13 years 1 month 3 days 22 hours ago) and read 1199 times:

The Maintenance Manual states that the Zone temp Bulbs send a signal to the EICAS computers. I am going back to work tomorrow and I will check myself, but I was wondering if someone knew off the head if this is true. I always thought it was only duct temperature. And I can't find anything in the wiring diagrams that support the zone temp being displayed on EICAS. I know Duct temp is there, but don't remember Zone temp being there. Maybe it's an option on some aircraft.

My Maintenance training manual also makes no mention of the Zone Temp indicated on EICAS.

CdfMxTech

5 replies: All unread, jump to last
 
User currently offlineFDXmech From United States of America, joined Mar 2000, 3251 posts, RR: 34
Reply 1, posted (13 years 1 month 3 days 3 hours ago) and read 1159 times:

You're correct. The zone duct temp bulb feeds the EICAS computer. The zone compartment temp bulb feeds the digital readout on the air conditioning panel.

I researched my old AA 757 manuals and saw where you might have thought that the compartment temp bulb might have fed the EICAS (poor wording in the studyguide). Truth is after reading it, that was the same conclusion I drew. But after rereading and rerereading and studying the simplified schematic in the study guide, I came to the shaky conclusion that the compartment temp bulb didn't feed the EICAS.
Then I checked my 757 schematic manual (interesting story how I got my hands on this beauty, maybe another time) which definitelt shows compartment temp bulb does not go to EICAS.
When you go to work, check out 757 schematics 21-65-01 and 21-65-02.



You're only as good as your last departure.
User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 27
Reply 2, posted (13 years 1 month 3 days 2 hours ago) and read 1151 times:

Thanx...I thought I was going nuts!!!

Both manuals ( 2 different airlines)that I have at home says the following:

"(5)Three zone temperature bulbs send electrical signals to the compartment temperature indicator. The three zone temperature bulbs also send electrical signals to the EICAS computer. The resistance-type temperature bulbs send a signal to the indicator and the EICAS computer. The strength of the signal changes because of changes in the temperature."

Both wiring diagrams (the ones you referenced) that I have with these manuals don't show any Zone Temp Bulb wiring to the EICAS. So I'll check with the ones at work. I think we're right..but maybe the ones at work MIGHT tell me something different.

Thanx
Cdf


User currently offlineAir2gxs From , joined Dec 1969, posts, RR:
Reply 3, posted (13 years 1 month 2 days 22 hours ago) and read 1146 times:

I'll check tonight but I thought some operators had compartment temp displayed on the ECS/MSG page. MAybe some operators have it displayed on status also. Can't have the drivers looking up all the time to decide whether its too hot or cold.

I'll look tonight on one of our B757s.


User currently offlineCdfmxtech From United States of America, joined Jul 2000, 1341 posts, RR: 27
Reply 4, posted (13 years 1 month 2 days 9 hours ago) and read 1142 times:

OK...I checked our B757s and we don't have Zone/Compartment Temp indicated on EICAS on eitehr the ECS/MSG page or the status page. I sent out a letter to our pubs dept. Air2gxs...lemme know about yours.

FDX - the wiring prints don't show Zone temp bulbs with outputs to EICAS on our WDM.

Cdf


User currently offlineAir2gxs From , joined Dec 1969, posts, RR:
Reply 5, posted (13 years 4 weeks 21 hours ago) and read 1133 times:

Sorry it took so long to get back to you. We had an air turnback for a failed 2040 (turbine seperation) and I never got back to the computer. Then I went on my days off. Precious days off.

We have no compartment twmp readout anywhere on EICAS. The only place to see compt. temp is the overhead panel. If I get a chance I'll break out the schematics and check if we have a leg from the bulbs to EICAS.


Top Of Page
Forum Index

Reply To This Topic B757 Zone/Duct Temp Indication
Username:
No username? Sign up now!
Password: 


Forgot Password? Be reminded.
Remember me on this computer (uses cookies)
  • Tech/Ops related posts only!
  • Not Tech/Ops related? Use the other forums
  • No adverts of any kind. This includes web pages.
  • No hostile language or criticizing of others.
  • Do not post copyright protected material.
  • Use relevant and describing topics.
  • Check if your post already been discussed.
  • Check your spelling!
  • DETAILED RULES
Add Images Add SmiliesPosting Help

Please check your spelling (press "Check Spelling" above)


Similar topics:More similar topics...
Fokker 50 Engine Air Duct posted Sun Mar 25 2007 00:18:43 by MerlinIIIB
B757-200 Ramp/Slide Diagrams Needed posted Wed Mar 21 2007 16:08:26 by Msllsmith
B757/767 Commonality? posted Sat Jan 20 2007 21:59:38 by A388
B757 & Signal Consolidation Card posted Thu Jan 11 2007 13:13:22 by HAWK21M
AA MIA-UVF On A B757: Why FL290 Ceiling? posted Sat Sep 2 2006 19:16:39 by Comorin
Etops Requirements For B737NG & B757 posted Sat Sep 2 2006 15:05:53 by HAWK21M
Freighters Without Insulation - Cabin Temp posted Wed Aug 30 2006 02:01:05 by Lotsamiles
B757 & 767 Flight Deck Differences posted Fri Aug 18 2006 13:02:08 by HAWK21M
High Air Temp Affecting Aircraft Performance? posted Wed Aug 2 2006 11:36:00 by Singel09
B757 Rectification [pic] posted Sun Jun 4 2006 21:06:38 by HAWK21M

Sponsor Message:
Printer friendly format