Hi all, I've been reading the AA 707 manual and I wanted to share what learned about engine bleeds and when to use them.

An important point to note is the 'bleed air flow is variable with throttle changes and should not be used exclusively in preference to T/C (turbocompressors) except where cabin cooling is a problem."

I made a 707 full flight + systems guide based on the manuals I've read if it helps anyone.

https://youtube.com/live/7EENovA2yFs?feature=share

Furthermore, you don't want to cause 'excessive cabin pressure surge' by operating too many bleeds and T/Cs at the same time.

During takeoff according to my UAL B720 manual, one T/C should be operating and no engine bleeds.

Between FL 150 and 320 the said manual also recommends around 2 T/Cs and 1 Engine Bleed, though the addon has 3 T/Cs which should suffice,

I saw a couple of prevalent flightsim youtubers in their 707 tutorials opening all 4 engine bleeds after start.

This is not the correct procedure as far as I know.

And they did not have any problems and did not crash!!

9 hours ago, TWSY said:

And they did not have any problems and did not crash!!

I mean, it's a video game. It's hard to actually have problems lol.

But he makes a great point, that part of what makes the classic jets interesting is a whole different level of systems babysitting being required. There's a reason an FE was a requirement. I would think that people interested in learning about the classics would appreciate this kind of info.

14 minutes ago, Stearmandriver said:

I mean, it's a video game. It's hard to actually have problems lol.

But he makes a great point, that part of what makes the classic jets interesting is a whole different level of systems babysitting being required. There's a reason an FE was a requirement. I would think that people interested in learning about the classics would appreciate this kind of info.

FE's sure did have their job cut out :)