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Different Eicas Displays?  
User currently offlineConcorde1518 From United States of America, joined May 2001, 746 posts, RR: 0
Posted (13 years 2 months 2 weeks 6 days 9 hours ago) and read 3630 times:

Hi everyone, I've noticed for some time that it seems that different engines have different EICAS Displays:

A SAA 744 (RB211's for this bird) has the EGT display on the EICAS where the KLM 744 (CF6) has only the N1 and EGT on the upper EICAS.

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Photo © Julian Whitelaw

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Photo © Timon Kruisman

The same appears to be true on the 777. UA 777 with the Pratts, and a Lauda with the GE90:

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Photo © Kyle Stephens

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Photo © Manuel bialonczyk

However, the 757 looks like the RB's and the Pratts have the same:

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Photo © Chris Coduto

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Photo © Bevin Shively

The 767's have the differences like the 777 and 744 with some missing the EPR between the CF6, RB, Pratt 4060 and JT9D.

Is this simply the airline's choice of display, such as how some have the round style instruments on the 737 Ng's instead of the tape style such as WN and CO, or how some airlines opt for the V Bar FD over the crosshair, or do the engines differ in a way that some do not have an EPR calculation? Would someone care to explain?


4 replies: All unread, jump to last
User currently offlineMandala499 From Indonesia, joined Aug 2001, 7561 posts, RR: 76
Reply 1, posted (13 years 2 months 2 weeks 6 days 1 hour ago) and read 3525 times:

RR & PW use EPR as the primary engine thrust indicator. N1 is there too, but most of the thrust figures in RR & PW use EPR
GE use N1 only.

Just a different way of doing it.


When losing situational awareness, pray Cumulus Granitus isn't nearby !
User currently offlineRick767 From United Kingdom, joined Jan 2000, 2662 posts, RR: 50
Reply 2, posted (13 years 2 months 2 weeks 6 days ago) and read 3507 times:

"However, the 757 looks like the RB's and the Pratts have the same"

Not quite, the Rolls Royce RB.211 is a triple spool engine and so has EPR, N1, N2 and N3 indications. Pratts don't have N3.

Both the above use EPR as the primary power indication, whilst as Mandala said GE fans (like we have on our 767s) use N1.

This is certainly not airline option (like V-shaped f/d bars and ADI speed tapes etc...) it is all associated with the engines fitted. You will notice A320s with EPR as the primary power reference (V2500? engines) and some with just N1 (CFM engines).

I used to love the smell of Jet-A in the morning...
User currently offlineB747skipper From , joined Dec 1969, posts, RR:
Reply 3, posted (13 years 2 months 1 week 3 days 8 hours ago) and read 3380 times:

Nice toys they have in these new airplanes... would (almost) confuse me... My old 747s are still equipped with steam powered gages...
Well, in truth, I often get to fly the airline executives in a little Learjet which is equipped with EICAS and FMS...
You mentioned V bars or crosshairs is not available choice... no no no...
The choice is indeed available... in that Learjet (since I hate V bars), I can press a little switch, and get the ADI display to show crosshairs as I like...
Happy contrails  Smile
(s) Skipper

User currently offlineGE From Singapore, joined Mar 2000, 320 posts, RR: 6
Reply 4, posted (13 years 2 months 1 week 3 days 4 hours ago) and read 3372 times:

Hi Skipper,
I think Rick was referring to the EICAS displays (primary engine reference) when he said that they weren't airline options/choices. He did mention that the f/d bars and adi speed tapes are a choice.

Russell J.

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