Sponsor Message:
Aviation Technical / Operations Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
747 Spool-up  
User currently offlineKimon From , joined Dec 1969, posts, RR:
Posted (4 years 5 months 3 weeks 4 days 23 hours ago) and read 2409 times:

http://www.youtube.com/watch?v=9Zfw3w3FRMA

The thrust levers are advanced (around half-way?) and then slammed back.
Their is an aural warning in the clip @ "0.40/41.
What is that sound?
Does the 744 have that sound too?
How far can you push the levers for an agressive spool-up?
Many thanks!

2 replies: All unread, jump to last
 
User currently offlineJetlagged From United Kingdom, joined Jan 2005, 2543 posts, RR: 25
Reply 1, posted (4 years 5 months 3 weeks 4 days 21 hours ago) and read 2369 times:

The aural warning is the takeoff configuration horn. If the thrust levers are pushed beyond a certain point the horn sounds if LE flaps, body gear steering, speedbrake, etc are not in the correct position. That wouldn't sound if the aircraft was correctly configured for takeoff. The video is shot in a 747 sim and they probably forgot to set takeoff flaps during filming, hence the warning. In theory you can slam the thrust levers to the firewall. The engine is protected by the fuel control unit which limits acceleration and prevents stall or surge. Normal procedure on a classic Boeing is to "stand up" the throttles (position them about halfway in the quadrant so the levers are vertical) and wait for all engines to stabilise before advancing them to takeoff power.

All modern airliners have a form of takeoff configuration aural warning.



The glass isn't half empty, or half full, it's twice as big as it needs to be.
User currently offlineTdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 80
Reply 2, posted (4 years 5 months 3 weeks 4 days 21 hours ago) and read 2366 times:



Quoting Kimon (Thread starter):
Their is an aural warning in the clip @ "0.40/41.
What is that sound?

It sounds like the configuration warning horn.

Quoting Kimon (Thread starter):
Does the 744 have that sound too?

If it's the configuration warning horn, then yes, the 744 has that sound.

Quoting Kimon (Thread starter):
How far can you push the levers for an agressive spool-up?

With FADEC engines, all the way to the stops. With non-FADEC's, it depends on the particular engine.

Tom.


Top Of Page
Forum Index

Reply To This Topic 747 Spool-up
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...
J-52 / JT8D / Swedish RM-8 Turbofan: Spool-up Time posted Sat Dec 29 2007 08:51:55 by Blackbird
Embraer 135-145 Engine Spool-Up Procedure posted Sat Dec 30 2006 07:28:49 by N243NW
747 - Gear Up.... posted Wed Aug 24 2005 16:30:46 by A3204eva
A320 'spool Up' During Cruising posted Thu Dec 23 2004 13:07:15 by MD80BOY
Engine Spool Up Time posted Sat Sep 18 2004 03:59:00 by Ba97
Engine Spool Up Before Take Off Power posted Mon Apr 16 2001 04:16:06 by Sxmarbury33
How Many Jacks Needed To Jack Up A 747 posted Tue Nov 18 2008 16:18:59 by Xms3200
Is It True A 747 Can Fly Belly-up For 12 Sec? posted Tue Dec 27 2005 21:59:09 by Tom12
747-400 Start-up Procedure posted Mon Mar 22 2004 22:14:08 by SpeedbirdHeavy
747 Correct Engine Start-Up Order posted Sat Mar 13 2004 00:43:00 by Cmckeithen

Sponsor Message:
Printer friendly format