Boeing B777F needs a jet air starter to start engine

Hello everyone, here a video of a GE90-110 startup with a jet air starter. Second engine started by cross bleed from the other engine. Enjoy the noise.
#aviation #boeing #aircraft #boeing777

[@twentyrothmans7308]

Dank u wel, Dennis, these are fascinating.

[@dmarck268]

so GE90 can't be started from APU bleed like on smaller brothers? UPD: Ah read your comment below; so, is this case APU did not work?

[@dennisvijverbergbrakesrele6098]

Indeed you only do this when APU is inoperative or it’s bleed supply to the aircraft is inoperative.

[@AVIATIONSOUNDEXPERT]

Interesting and dangerous task for the ground crew. I didnt know that an engine start would take so long, even with two mobile Ground Air Units. Do you know the time limits for engine start for the GE90-110/115B1? for example: -Normal engine start with Bleed Air from APU -Engine start with Ground Air Unit -Crossbleed Air Engine Start Would it be possible to start the engine with only one Ground Air Unit?

[@dennisvijverbergbrakesrele6098]

It doesn’t matter how you start the engine, it all depends on the starter. You can use the starter for 5 minutes, then you should abandon the start up of the engine if it doesn’t start up. The starter cycle is 5 minutes on / 10 minutes off. With just the APU bleed the engine normally starts up to idle in about a minute. Same when using the other engine as the bleed source. With the jet air starter it all depends how much air it gives, but as long you don’t pass the 5 minutes the starter is engaged and all engine parameters stay within limits an engine start that takes a couple of minutes is then not a problem. So far I haven’t seen a ground air unit that could start it with one hose. Have seen it with just two. In the end it all depends how good the unit is.

[@ImperrfectStranger]

I was wondering how you started GE90s... then I saw your two start carts. My old airline's start carts can barely handle RB211's 😋 For the crossbleed start, do you need to go up on power on the RH engine? I couldn't hear a change in engine tone.

[@dennisvijverbergbrakesrele6098]

Hello, I checked, but there is no requirement for the working engine to be set at a higher power setting when doing a cross bleed start.