aeroweanie
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E-3 & E-8 APUs

Thu Jun 09, 2005 8:53 am

Does anyone know if either the E-3's APU or the E-8's APU is operable in flight?

E-3:

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E-8:

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DeltaGuy
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RE: E-3 & E-8 APUs

Thu Jun 09, 2005 4:09 pm

Great question..I don't think so, because I don't remember the E-6's having that capability either.

It was nice that they relocated the single-point fueling port from the wings to the fuselage though...made my day easier  Smile

DeltaGuy
"The cockpit, what is it?" "It's the little room in the front of the plane where the pilot sits, but that's not importan
 
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bully707
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RE: E-3 & E-8 APUs

Thu Jun 09, 2005 10:12 pm

Quoting AeroWeanie (Thread starter):
Does anyone know if either the E-3's APU or the E-8's APU is operable in flight?

If memeory serves, the APU on our E-3 was used on the ground only....
After the engines were up and running...and the after taxi check was completed, the FE switched from the APU to the generators and shut down the APU...

After runway turn-off, the FE powered the APU back up and then cut off no.1 and 4 engine...so the E-3 was manoevered with no.2 and 3 engines only.

It's been 5 years that I flew the E-3 last, and can't remember 100% though...  Sad I've been an operator, only...not a FE or crewchief...  Wink

That doesn't really answer your question, but I think that the APU can be operated in flight.... ANY E-3 Mechs around??????  Wink

Godspeed

Bernd
"That's the good thing about the 707...it can do anything, but read!" Joe Patroni, Airport '70
 
Venus6971
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RE: E-3 & E-8 APUs

Thu Jun 09, 2005 11:39 pm

Ok Bully, here is the scoop. The E-3 APU cannot repeat cannot be operated in flight. First it is tied to the squat switch on the gear plus if the inlet and exhaust doors are opened in flight or stuck open the aircraft will not pressurize since it is in the aft lower lobe. I remember on one certain acft once we had engines and generators on line I told the FE to shut down the APU so I could make sure the exhaust door will not get hung up , if it did it took a well placed hit with a rubber mallet to seat. Also after it shutdown the sequence valves and solenoids got out of wack and had to jump in the aft lobe on numerous hammerheads to open the big start box next to the apu to manually close the inlet and exhaust doors.
The APU generator also will not pararell or share power with the other 8 engine generators. So when engines are started and generators are brought in line and when you are in the back on headset you get that tone when they switch power and APU gen automatically goes off line.
I would help you but it is not in the contract
 
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bully707
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RE: E-3 & E-8 APUs

Fri Jun 10, 2005 12:18 am

Well...THANK YOU !!!!!!!  wave 

That was really good....I always heard the tone, when the generators were brought online...but never knew that the APU was shut down automatically!!!!!

It is a real shame... Sad 7 years of flying in that thing and I never knew that...!!! Big grin

I guess I should have paid more attention when sitting in seat 5...instead of glancing out of the window....  Wink

Godspeed

Bernd
"That's the good thing about the 707...it can do anything, but read!" Joe Patroni, Airport '70
 
aeroweanie
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RE: E-3 & E-8 APUs

Fri Jun 10, 2005 1:18 am

Venus6971:

Thanks for the info!
 
wingnut135
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RE: E-3 & E-8 APUs

Fri Jun 10, 2005 7:01 am

I worked the E-8 for three years, and it was designed to be operated in flight to augment the air coming from the engines, but never really worked. It was inside it's own unpressurised "can" in the aft lower lobe. There wasn't an inlet or exhaust door, just holes in the side of the plane. Not sure why it didn't work though.

Wingnut

[Edited 2005-06-10 00:08:45]
A good friend will get you out of jail. A real friend will be there with you saying, "Damn that was fun!"
 
aeroweanie
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RE: E-3 & E-8 APUs

Fri Jun 10, 2005 8:19 am

Wingnut135:

Thanks! I have designed a similar system that is now being fabbed and I was wondering if someone else had gotten such a system to work. It looks like the E-8 has such a system...

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