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HAWK21M
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Posts: 30002
Joined: Fri Jan 05, 2001 10:05 pm

RB211-535 Query.

Thu Jul 02, 2009 9:21 am

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.
I may not win often, but I damn well never lose!!! ;)
 
tdscanuck
Posts: 8572
Joined: Wed Jan 11, 2006 7:25 am

RE: RB211-535 Query.

Thu Jul 02, 2009 2:59 pm



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.
 
PITingres
Posts: 1072
Joined: Fri Dec 21, 2007 1:59 am

RE: RB211-535 Query.

Thu Jul 02, 2009 11:20 pm

and if you were as puzzled as I was, "EEC" == "Electronic Engine Control" ...
Fly, you fools! Fly!
 
Tristarsteve
Posts: 3400
Joined: Tue Nov 22, 2005 11:04 pm

RE: RB211-535 Query.

Fri Jul 03, 2009 8:01 am



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.
 
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HAWK21M
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Joined: Fri Jan 05, 2001 10:05 pm

RE: RB211-535 Query.

Fri Jul 03, 2009 9:25 am



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.
I may not win often, but I damn well never lose!!! ;)
 
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HAWK21M
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Joined: Fri Jan 05, 2001 10:05 pm

RE: RB211-535 Query.

Sat Jul 04, 2009 9:40 am

Practically checked the Indications tonight with tailwinds & aircraft parked with only APU power.No RPM was registered on EICAS.
regdss
MEL.
I may not win often, but I damn well never lose!!! ;)

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