Sponsor Message:
Aviation Technical / Operations Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
HMU/FADEC  
User currently offlineIvo21 From Netherlands, joined Jan 2002, 25 posts, RR: 0
Posted (12 years 6 months 3 weeks 19 hours ago) and read 2463 times:

I have a question,

On an HMU of any high bypass engine, the medium used to transmit any form of adjusting of the vanes and valves is done by pressurised fuel from the HMU.
But when fuel is pressurised at such an extend, it there a safety built in to protect the pressurised fuel lines from air/oxygen entering the fuel pressurised system. Because if air did get in, you would have not only an engine fire, but a wing fire I think.

What do you think??

Ivo 21

1 replies: All unread, jump to last
 
User currently offlineNKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 5
Reply 1, posted (12 years 6 months 3 weeks 17 hours ago) and read 2439 times:

It's a closed system...and in any event, "air" is just that: Air, a 21/78 O2/N2 mix...not 100% oxygen. The largest concern however would be a leak, in either the fuel lines, or the dynamic/static seals in a component; This is why line couplings for high pressure fuel running in the core (hot ) area are shrouded and provided with their own overboard drain system. This is also the case for the VBV and VSV actuators: They're constructed in such a way that a blown seal would be directed to a drain line or lines, and run out of the drain mast instead of spraying all over the hot core. Fuel pumps, and HMU's ( or MEC's, or FFG's, as the case applies ) etc are provided with drains as well if the shaft or other seals fail or "weep" fuel.

Top Of Page
Forum Index

Reply To This Topic HMU/FADEC
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...
CRJ Fadec posted Thu Apr 20 2006 05:58:53 by AirWillie6475
Any Aircraft Equipped With FADEC? posted Tue Apr 11 2006 04:36:03 by Spikebe90
Fadec Details posted Sun Nov 3 2002 08:23:19 by Rendezvous
HMU/FADEC posted Wed Jun 5 2002 14:19:00 by Ivo21
Fadec posted Mon Sep 17 2001 18:58:51 by Diego
Fadec Vs. Eec posted Sun Jul 15 2001 17:27:09 by Modesto2
Fadec posted Fri Jul 6 2001 19:47:59 by Modesto2
Fadec Limit? posted Sun May 20 2001 08:27:36 by Blackbird
Fadec Your Views posted Mon Mar 19 2001 02:03:51 by A/c train
APU-FADEC's posted Tue Mar 13 2001 08:12:54 by A/c train

Sponsor Message:
Printer friendly format