andz
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What Is This Duct On Air Force One?

Sun May 15, 2005 5:49 am

What is that duct above the APU exhaust for?


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flyf15
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RE: What Is This Duct On Air Force One?

Sun May 15, 2005 6:06 am

Thats not Air Force One first off, it is an E-4, not a VC-25. That is not actually a duct, it is a very long antenna that can be reeled out and trailed behind the aircraft.
 
andz
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RE: What Is This Duct On Air Force One?

Sun May 15, 2005 6:09 am

see I come here to learn. thanks.
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futureuapilot
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RE: What Is This Duct On Air Force One?

Sun May 15, 2005 7:04 am

Wow, that's an interesting 747... what's the top little thing where the first class cabin for and what does that antenna do, is it just to get more radio reception?

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Fokker Lover
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RE: What Is This Duct On Air Force One?

Sun May 15, 2005 9:54 am

I'm not an electronic expert, and don't have a clue to what all of those freaking antennas really do. So take that as the disclaimer that it is. I'm going to take a wild ass guess, and say if it is an antenna that reels out waaaayyyy behind the plane, it is a low frequency transmitter. I'm also going to guess that it would be used while circling in a pattern over the ocean while they transmit orders and information to submerged submarines.

If anybody can either confirm or deny this with fact, I'll gladly refund twice what you paid for my opinion. Because I am just guessing.
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Starlionblue
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RE: What Is This Duct On Air Force One?

Sun May 15, 2005 11:20 am

Quoting Fokker Lover (Reply 4):
I'm not an electronic expert, and don't have a clue to what all of those freaking antennas really do. So take that as the disclaimer that it is. I'm going to take a wild ass guess, and say if it is an antenna that reels out waaaayyyy behind the plane, it is a low frequency transmitter. I'm also going to guess that it would be used while circling in a pattern over the ocean while they transmit orders and information to submerged submarines.

Fokker Lover nailed it. The antenna is for contacting subs. Very low frequency. It requires a long antenna. That's just physics. Some other planes have a similar arrangement. IIRC you circle to create a spiral of the antenna.

Quoting FutureUApilot (Reply 3):
what's the top little thing where the first class cabin

More antennas, including a dish under a fairing. and of course there's ECM equipment sprinkled around the airframe.
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
BandA
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RE: What Is This Duct On Air Force One?

Sun May 15, 2005 1:26 pm

Since its mentioned already that this is not Air Force One, what is this particular aircraft used for? what are the differences between E-4 and a VC-25?

If this has been discussed before (the differences between e-4 and vc-25) I apologize, and would appreciate a link to such existing thread.
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Matt72033
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RE: What Is This Duct On Air Force One?

Sun May 15, 2005 5:17 pm

Quoting Starlionblue (Reply 5):
More antennas, including a dish under a fairing. and of course there's ECM equipment sprinkled around the airframe.

do you mean radar dish by this?
I always assumed it was some kind of auxiliary air intake! lol but from looking at the pictures closely I can see it clearly isn't

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Starlionblue
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RE: What Is This Duct On Air Force One?

Sun May 15, 2005 10:13 pm

Quoting BandA (Reply 6):
Since its mentioned already that this is not Air Force One, what is this particular aircraft used for? what are the differences between E-4 and a VC-25?

E-4 is NEACP (National Emergency Airborne Command Center, pronounced "kneecap") and serves as flying command post in time of war. Has full comms and command capability. Can be refueled in flight and all that jazz. The plan is for the president to be on it in case of an attack. There are 4 E-4s.

VC-25 is the plane commonly known as "Air Force One" (when the president is board). It is used for official travel and while it does have some comms and command capability, it is a representation vehicle and does not have the same military utility as the E-4. Has space for the press in the back. Can be refueled in flight although the pilots prefer to practice with the E-4s to avoid accidentally scratching the nose. There are 2 VC-25s.

Quoting Matt72033 (Reply 7):
do you mean radar dish by this?

I think it's more like a satellite comms dish.
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DIJKKIJK
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RE: What Is This Duct On Air Force One?

Sun May 15, 2005 10:41 pm

Say, I have a question. Do the VC25 or the E4 have any anti-missile defence capability? Can they be configured to fire missiles in case there is some attack while the president is on board?
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OPNLguy
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RE: What Is This Duct On Air Force One?

Sun May 15, 2005 11:51 pm

Quoting DIJKKIJK (Reply 9):
Do the VC25 or the E4 have any anti-missile defence capability? Can they be configured to fire missiles in case there is some attack while the president is on board?

I don't know about the E4s, but the VC25s have IR countermeasures (IRCM) installed with each of the engines, on the trailing edge of each engine pylon. Might be one on the APU exhaust as well. The ones on the VC25 are alot smaller than the ones on the old 707 (the IRCM on that one made look like an old 57 Caddy). I believe the NASA SCA 747s also have the IRCM stuff, the Shuttle being a national symbol and all.

Don't think there's anything the VC25 can launch; I supposed that'd be the job the any escort fighters. Don't know about the E4...
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N766UA
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RE: What Is This Duct On Air Force One?

Mon May 16, 2005 1:56 am

Good luck getting an answer as to what 90% of the gizmos on that jet do... most of it's classified!

Also, I'm thinking the VC25 would have flares in addition to IRCM, etc.
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BandA
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RE: What Is This Duct On Air Force One?

Mon May 16, 2005 3:27 am

Quoting Starlionblue (Reply 8):

Starlionblue, Thanks much for your response! Honestly I never knew there was a seperate NEACP aircraft. I thought whenever they mentioned NEACP they were referring to Airforce One! This also explains why I never saw that huge bulge on top of Airforce One on TV, since I am sure it doesnt have one like the NEACP aircraft.

Now I know, facinating stuff!
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SATL382G
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RE: What Is This Duct On Air Force One?

Mon May 16, 2005 4:09 am

Quoting Starlionblue (Reply 8):
E-4 is NEACP

The E-4 was the NEACP until the Soviet Union collapsed and the NEACP mission diminished severely. Now it is called the NAOC or National Airborne Operations Center.

http://en.wikipedia.org/wiki/NAOC

I'd suggest you repost this in Mil Av -- you're more likely to get an accurate response there.
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Starlionblue
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RE: What Is This Duct On Air Force One?

Mon May 16, 2005 8:26 am

Ah thx SATL382G.
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"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
gothamspotter
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RE: What Is This Duct On Air Force One?

Mon May 23, 2005 12:11 pm

Most commonly referred to as "the Doomsday Plane". If the President ever has to board one of these birds, it means we're pretty well f---ked. Big grin
 
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Starlionblue
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RE: What Is This Duct On Air Force One?

Mon May 23, 2005 1:33 pm

Quoting GothamSpotter (Reply 15):
Most commonly referred to as "the Doomsday Plane". If the President ever has to board one of these birds, it means we're pretty well f---ked.

He might just need a haircut Big grin
"There are no stupid questions, but there are a lot of inquisitive idiots." - John Ringo
 
SATL382G
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RE: What Is This Duct On Air Force One?

Mon May 23, 2005 10:42 pm

Quoting GothamSpotter (Reply 15):
Most commonly referred to as "the Doomsday Plane". If the President ever has to board one of these birds, it means we're pretty well f---ked.

Not necessarily. Presidents have gotten orientation flights..... It hasn't been publicized since Carter did it though....
"There’s nothing quite as exhilarating as being shot at and missed" --Winston Churchill
 
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HAWK21M
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RE: What Is This Duct On Air Force One?

Mon May 23, 2005 11:29 pm

Quoting GothamSpotter (Reply 15):
Most commonly referred to as "the Doomsday Plane". If the President ever has to board one of these birds, it means we're pretty well f---ked.

What about Non serious Flights on board  Smile
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