Jump to content

Sign in to follow this  
Guest joe_walburn

747 Engine Start Problem!!!

Recommended Posts

Guest joe_walburn

Must be loosing my mind, but SOMEHOW I'm getting all the way to the engine start and when I click the #4 engine start button, the white center (light, I guess) will not come on and therefore not start when I engage the throttle #4 cutoff lever. Yes, I turned off Autostart and engaged Con ignition, but no go. However, it HAS started in the past so I'm missing something or doing something stupid. Man, is it aggravating!!!Any of you smart kids out there have any idea what this yokel might be doing wrong? I know the default Gate I1 at KLAX is messed up, so I haven't been using it. It's probably something simple, but any help will get you remembered in my Last Will and Testament.Buffaloed in Ohio,joe mahma

Share this post


Link to post
Guest AJ

>Must be loosing my mind, but SOMEHOW I'm getting all the way>to the engine start and when I click the #4 engine start>button, the white center (light, I guess) will not come on and>therefore not start when I engage the throttle #4 cutoff>lever. Yes, I turned off Autostart and engaged Con ignition,>but no go. However, it HAS started in the past so I'm missing>something or doing something stupid. Man, is it>aggravating!!!Any of you smart kids out there have any idea>what this yokel might be doing wrong? I know the default Gate>I1 at KLAX is messed up, so I haven't been using it. It's>probably something simple, but any help will get you>remembered in my Last Will and Testament.>>Buffaloed in Ohio,>joe mahma1. Did you forget to turn on the hydraulic demand pumps (1,2,3 - on, 4-aux)? This is perhaps the easiest one to forget.2. APU runing and APU bleed on?3. Fuel pumps on4. Electrical bus ties open?5. Packs off (or one on and two off)?Andrew

Share this post


Link to post
Guest joe_walburn

Thanks much, Andrew. Actually, I'm pretty sure that it was those two isolation switches that let air flow freely between the air packs. But sooner or later, I'll forget one of those other items you mentioned. Appreciate your help and knowledge.Joe Walburn

Share this post


Link to post

Don't touch the buttons, but scan the checklists from Cold to startup to see if anything got missed out.Helps spot the bits you missed, so you can learn to check for then in the future.

Share this post


Link to post

"1. Did you forget to turn on the hydraulic demand pumps (1,2,3 - on, 4-aux)? This is perhaps the easiest one to forget."This shouldn't affect engine start however ;)"2. APU running and APU bleed on?"Correct, but don't forget to put the engine bleeds on, too. The engine valves have to be "armed", so that when you pull the start switch, the valves are able to reconfigure themselves to divert bleed air to the (pneumatically powered) starter motor."3. Fuel pumps on"True, but it is possible to start an engine with the fuel tank pumps off."4. Electrical bus ties open?"I guess you mean closed (otherwise electricity will not flow to the right parts).Hope this helpsCheers.Q>

Share this post


Link to post

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  
  • Tom Allensworth,
    Founder of AVSIM Online


  • Flight Simulation's Premier Resource!

    AVSIM is a free service to the flight simulation community. AVSIM is staffed completely by volunteers and all funds donated to AVSIM go directly back to supporting the community. Your donation here helps to pay our bandwidth costs, emergency funding, and other general costs that crop up from time to time. Thank you for your support!

    Click here for more information and to see all donations year to date.
  • Donation Goals

    AVSIM's 2020 Fundraising Goal

    Donate to our annual general fundraising goal. This donation keeps our doors open and providing you service 24 x 7 x 365. Your donation here helps to pay our bandwidth costs, emergency funding, and other general costs that crop up from time to time. We reset this goal every new year for the following year's goal.


    2%
    $705.00 of $25,000.00 Donate Now
×
×
  • Create New...