Sponsor Message:
Aviation Technical / Operations Forum
My Starred Topics | Profile | New Topic | Forum Index | Help | Search 
Engine Start With The 747/200  
User currently offlineOli From France, joined Jun 2005, 24 posts, RR: 0
Posted (4 years 7 months 2 weeks ago) and read 4488 times:

Hi,

I am using a great simulation of the 747/200 (Ready for Pushback) and it is stated that, for engine start, the fuel panel must be configured so that wing tank 2 feeds all engines.
This is then modified for takeoff.

Is that the real procedure and, if so, why?

Thanks in advance for your input,

Olivier

6 replies: All unread, jump to last
 
User currently offlineLowrider From United States of America, joined Jun 2004, 3220 posts, RR: 10
Reply 1, posted (4 years 7 months 1 week 6 days 22 hours ago) and read 4450 times:

If I recall correctly, the configuration for engine start is Tank to Engine. There are 6 or 8 tanks in the wings, depending on the configuration purchased, 4 main, and 2 (or 4) reserve tanks. For engine start each main tank feeds its respective engine. Why? The simple answer is Boeing wanted it that way. But it also verifies the operation of the pumps in each main tank, something that would not be done if the engines were started in an Inboards to All, Center to all, or Center to Outboard feed configuration. For take off you may use Center to Outboard, or Tank to Engine, depending on your fuel load.


Proud OOTSK member
User currently offline747classic From Netherlands, joined Aug 2009, 2103 posts, RR: 14
Reply 2, posted (4 years 7 months 1 week 6 days 8 hours ago) and read 4344 times:

With only wing tanks containing fuel, the engine start is accomplished with (main)tank to engine.
Fuel panel configuration : All main tank boost pumps on and X-feed vlv's 1 & 4 open and 2 & 3 closed.

With wing tanks full and when center wing tank also contains fuel (more than 1800 kgs) the start is made with engines 1 & 4 fed by center wing tank, with both CW override jettison pumps selected on and overriding the main tank 1 &4 boostpumps.
Fuel panel configuration : All main tank boost pumps on, both CW overr/jett pumps on, X-feed vlv's 1 &4 open and 2 & 3 closed.

Ref : 747 OM part B ,normal procedures, 6.2.2.11.



Operating a twin over the ocean, you're always one engine failure from a total emergency.
User currently offlineLowrider From United States of America, joined Jun 2004, 3220 posts, RR: 10
Reply 3, posted (4 years 7 months 1 week 6 days 4 hours ago) and read 4273 times:



Quoting 747classic (Reply 2):
With wing tanks full and when center wing tank also contains fuel (more than 1800 kgs) the start is made with engines 1 & 4 fed by center wing tank,

Thanks. I couldn't remember if that feed was used for starting or not.



Proud OOTSK member
User currently offline747classic From Netherlands, joined Aug 2009, 2103 posts, RR: 14
Reply 4, posted (4 years 7 months 1 week 6 days 3 hours ago) and read 4257 times:

Quoting Oli (Thread starter):
the fuel panel must be configured so that wing tank 2 feeds all engines.

Maybe you are confused with the following.
During ground operations : With all main tank boost pumps selected off, auto fuel feed to the APU is accomplished with the aft boost pump of main tank #2.

[Edited 2010-01-10 12:14:31]


Operating a twin over the ocean, you're always one engine failure from a total emergency.
User currently offlineOli From France, joined Jun 2005, 24 posts, RR: 0
Reply 5, posted (4 years 7 months 1 week 6 days 2 hours ago) and read 4237 times:

Hi,

Thanks you all for your input - I read the manual again and I think they made a mistake - a tank to engine configuration makes more sense (this is what is used for takeoff as well if I am not mistaken - if the center tank is full, then the setting "main center tank feeds all engines" must be selected during the climb, until the main center tanks is empty, am I correct?).

Happy flying,

Olivier


User currently offline747classic From Netherlands, joined Aug 2009, 2103 posts, RR: 14
Reply 6, posted (4 years 7 months 1 week 5 days 16 hours ago) and read 4155 times:

If the centerwing tank contains fuel, you have to select "Center wing tank to all engines" during CLB.
Fuel panel configuration :
All X-feed valves open, 1 & 4 boostpumps off, 2 & 3 boostpumps on, CW overr/jett pumps on.

If center wing is empty (CW overr/press lights flashing) :
All X-feed valves open, 1 & 4 boostpumps off, 2 & 3 boostpumps on, CW overr/jett pumps off.
Scavage pump on : to get remaining fuel out of centerwing tank into to main tank #2.
Now you are on : main tank 2 & 3 feeding all engines.



Operating a twin over the ocean, you're always one engine failure from a total emergency.
Top Of Page
Forum Index

Reply To This Topic Engine Start With The 747/200
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...
Engine Start Sequence On 747's posted Fri Apr 26 2002 06:31:03 by Rohan737
Engine Start In The 764 posted Fri Sep 15 2000 06:42:46 by Gnomon
747-200/300's With The 10 Fuel Tank Option posted Wed Dec 4 2002 05:33:41 by Rohan737
Engine Start Sequence On The 747 posted Sat Feb 23 2002 19:23:46 by Rohan737
747-200 With "glass Cockpit" posted Sat Mar 22 2008 12:23:17 by LockstockNL777
Can This Be Done With A 747-200 posted Sat Jul 14 2007 00:38:15 by Blackbird
747 Correct Engine Start-Up Order posted Sat Mar 13 2004 00:43:00 by Cmckeithen
Engine Nacelle Diffrences On The 747? posted Wed Jan 31 2001 21:32:49 by Ericmetallica
747-400 Engine Start Up posted Sat May 27 2000 12:44:48 by Future_747_f/o
Vertical Tapes Vs Round Dials 747-200 posted Fri Jan 1 2010 13:51:56 by Kimon

Sponsor Message:
Printer friendly format