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BA 38--777

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tfisher(at)commandergroup
Guest

Posted: Sat Feb 02, 2008 7:10 pm Post subject: BA 38--777

When I flew helicopters in the high North (North of the  magnetic North Pole) we added an anti-ice liquid called Prist (brand name) this  allowed flight to -45 degrees C which was the limit for the Bell 212 rotor  blades.

  

 Tom

 C-GISS

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wjrhamilton(at)optusnet.c
Guest

Posted: Sun Feb 03, 2008 3:40 am Post subject: BA 38--777

Dan,

 For your refresher, it is the fuel itself that is freezing solid at -40C, if it is JetA, or somewhat colder if it is Jet A-1 (-56C comes to mind), the water has long since come out of solution, that is why you have fuel filters and filter heaters, to melt the ice crystals, so it flows through the engine harmlessly. Generally you start applying fuel filter heat (manually or automatically) when the fuel temp. drops below +4C, of the filter differential pressure warning light illuminates.

 Cheers,

 Bill Hamilton



  



 At 04:49 3/02/2008, you wrote:

  	  Quote: 	
		  Hi All,

  

 I am pleased to say that my senario of events based on systems knowledge has been born out.  I am currently in recurrent trainging which comes around every 9 months and what I hear is the same as being posted on this site.  I did make at least one mistake.  I said that battery power would power capt inst for 30 minutes.  That goes back to 727 and is not correct for 777.  Bat power will only last for 5 minutes due to high load but all those items will be picked up by ram air turbine (RAT) when it deploys and comes up to speed--about 40 seconds.  The APU will come up in about a minute and power all electrics (less gallies) and full compliment of hydraulics at reduced rate.  You must have electric and hydraulics to fly a 777. 

  

 As to fuel temp.  Jet A starts to form ice crystals at about -40C (-40C & -40F are equal) so Boeing says at -37C to take corrective action.  The 777 does not have ability to heat fuel or aleast Rolls engines do not.  So the options are to seek a warmer altitude or higher speed to increase skin temp.  I have about 2500 hours on 777 and have never see it a problem personally but know that it can be, especially on the polar routes which I think BA was on.

  

 Clear as mud

 dan 

  

  



 

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