Engine Starting B747 400 | B747 8

This Tutorial Briefing Covers Engine Starting On The B747-400 and B747-8. Both Manual Starts and Auto Start is Covered For The P&W Engines and the GE Engines, with emphasis on what to look for during engine start.

[@G-AWNA]

Fantastic stuff. If you’re looking for non-normals simulated with complete accuracy check out Aerowinx PSX 747.

[@subsonicflighttraining]

Yes, I agree and that is what I thought, I was going into a briefing room last month and I saw a guy next door to me who had it up on a big TV. I stuck my head in said hello, and asked what product that was, and he said Aerowinx, it looked fantastic...

[@n1msu]

@@subsonicflighttraining It's a great platform and the reason I searched deeply and found your videos; I have PMDG QOTS, relatively easy compared to aerowinx software. I think Hardy, the dev would love to hear from you

[@4ndroidG]

Thank you! Excellent presentation! It's too bad the PMDG 747 can't simulate more failures. It would have been great to see examples of when you do the "Eng 1,2,3,4 Autostart" and "Aborted Engine Start" memory items.

[@subsonicflighttraining]

Yes, I really haven't looked at many non-normals till recently, but some I have looked at do not accurately display what happens. I guess PMDG for a $100 product isn't going to replicate accurately every non-normal that a 30 million dollar simulator would, that would be expecting a lot, I think the Aerowinx 400 would do a better job, but it has a $400 price tag on it.

[@mishmish1968]

Thanks , great video.

[@subsonicflighttraining]

Your welcome as always Mishmish, appreciate the feedback...

[@mishmish1968]

@@subsonicflighttraining My pleasure .

[@jeffhiew5795]

If a 747 has a faulty APU, what is the recommended X Bleed engine start procedure with a GPU? Would be great to learn from your video tutorial. If the weather is hot, which engine would you power up first for the packs.

[@ArmyofSeaturtles]

mechanic here what we do is start one engine at the gate with air start cart, engine 4 on the 747, push back and perform a cross bleed normal start sequence 4,1,2,3 or 4,3,2,1, different carriers have different SOP

[@RmDIrSudoSu]

Hi, I'm sorry to have so many questions, I hope that it does not bother you, but on a 747-400 what would happen if: 1) The Engine 1 2 3 4 bleed air is OFF? Do they start normally or is the bleed air required in some way for the engine start? 2) What pumps start the engine? the center pumps if the center tank is filled or the Ovrd 2 and 3 if it is not, or does the engine start on it's own Main Tank or does it start on the Ovrd pumps on it's side (so Ovrd 2 for engine 1 and 2 and Ovrd 3 for engine 3 and 4)? Thank you so much for such a great content.

[@ArmyofSeaturtles]

bleed air is necessary to start engines on the 747 usually from APU or ground AIR START CART, the pumps in the fuel tanks and engine driven pumps feed the engines. the center tank pumps will feed all 4 engines on start up

[@RmDIrSudoSu]

@@ArmyofSeaturtles Thank you, for the bleed air I realized that a couple of hours after writing that question, but I was still looking to know which fuel tanks fuel which engine at startup, because I wasn't sure that it followed the fuel system logic at startup.

[@subsonicflighttraining]

On the bleed air, depends what you are referring to. Are you talking the OFF light in the switch or are you talking the actual switch is OFF. The light simply means the bleed valve is closed. It is electrically controlled, pneumatically operated. When air from the APU or ground carts are supplied and the start switch is pulled, the valve opens automatically providing air for start. If the actual switch is OFF, this closes the bleed valve, the PRV valve, and the HP valve. When the switch is ON, all 3 valves are armed to operate when air is available or when required by system logic. Normally, the switch is left on. During start, all cross feeds are open, unless you are tank to engine, then 1&4 would be closed and overrides 2&3 turned off. With fuel in the center tank, the center tank would feed all engines on start. If no center tank and 2&3 tanks > 1&4 tanks, overrides 2&3 would feed all 4 engines on start. If tank to engine, respective main tank would feed each engine, hope that helps...

[@RmDIrSudoSu]

@@subsonicflighttraining This helps quite a lot thank you so much. :)

[@safarifari6045]

Hi nice channel nice content.Can you do a vedic about radio communication

[@subsonicflighttraining]

I will add it to the systems list, glad you find value in my briefings...

[@B744ERFJackLoh]

What about the RR

[@subsonicflighttraining]

That is a good point, I really have not been exposed to the RB211 version on the 747-400. I would say in the USA P&W and GE were mainly the rule, but the Brit’s and Aussie’s preferred the RB 211. So, being a yank, I guess it is all what you are used to. On the 747-8, the GEnx engine is used exclusively…

[@macieksoft]

No manual starts in -8, no CON, no selection for ignitiers, shame on you Boeing.

[@subsonicflighttraining]

Yep, more automation. The more stuff pilots can’t touch or interact with, the better...

[@macieksoft]

@@subsonicflighttraining Boeing said that when making MCAS, but the reality proven that more control is more safety.

[@subsonicflighttraining]

I am being sarcastic with my comment, Boeing is a mini dysfunctional government that needs to get back to the core values that made it great with laser focus on safety and not the ivory tower and bean counting...