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RB211-535 Query.  
User currently offlineHAWK21M From India, joined Jan 2001, 31712 posts, RR: 56
Posted (5 years 5 months 3 weeks 3 days 6 hours ago) and read 3311 times:

Presumingly there is a heavy tailwind prevailing at the time & the engine is windmilling but in the opposite direction.Will N1 or N2 register on the gauges?
regds
MEL.


Think of the brighter side!
5 replies: All unread, jump to last
 
User currently offlineTdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 1, posted (5 years 5 months 3 weeks 3 days ago) and read 3269 times:



Quoting HAWK21M (Thread starter):
Presumingly there is a heavy tailwind prevailing at the time & the engine is windmilling but in the opposite direction.Will N1 or N2 register on the gauges?

If the EEC is off, probably not. Most FADEC engines don't report anything to the airplane unless the EEC is powered. If you've got the EEC on but aren't running a start, I'm not sure. Some RR engines have a threshold below which they won't show the spool rotation to prevent nuisances...this might cover up wind-driven windmilling, regardless of direction.

Tom.


User currently offlinePITIngres From United States of America, joined Dec 2007, 1163 posts, RR: 13
Reply 2, posted (5 years 5 months 3 weeks 2 days 16 hours ago) and read 3195 times:

and if you were as puzzled as I was, "EEC" == "Electronic Engine Control" ...


Fly, you fools! Fly!
User currently offlineTristarSteve From Sweden, joined Nov 2005, 4069 posts, RR: 33
Reply 3, posted (5 years 5 months 3 weeks 2 days 7 hours ago) and read 3133 times:



Quoting Tdscanuck (Reply 1):
Most FADEC engines don't report anything

But the RB211-535 is not a FADEC engine!
This engine has steel cable throttle controls, a separate bleed valve controller, and an EEC. The EEC is in the aircraft fwd equip bay, and acts mainly as a overlimit controller, reducing the fuel flow to avoid exceedances.


User currently offlineHAWK21M From India, joined Jan 2001, 31712 posts, RR: 56
Reply 4, posted (5 years 5 months 3 weeks 2 days 6 hours ago) and read 3122 times:



Quoting TristarSteve (Reply 3):
The EEC is in the aircraft fwd equip bay, and acts mainly as a overlimit controller, reducing the fuel flow to avoid exceedances

True.preventing overboost of EGT & N1 via the engine supervisory & Engine limiter controls respectively.

Just had this thought on the RPM indications query the other day when it was windy at pushback,awaiting another day so I can ask the crew what they observed.

regds
MEL.



Think of the brighter side!
User currently offlineHAWK21M From India, joined Jan 2001, 31712 posts, RR: 56
Reply 5, posted (5 years 5 months 3 weeks 1 day 6 hours ago) and read 3020 times:

Practically checked the Indications tonight with tailwinds & aircraft parked with only APU power.No RPM was registered on EICAS.
regdss
MEL.



Think of the brighter side!
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