747 Experts! I need help!

ba777-236 · 06-16-2003, 10:23 PM

I've seen these objects on a real 747 nose and in pictures but have never know what they are. So what are these things on the aircraft nose? Are they some sorta antenna's or something?

Any help would be appreciated,
Faheem

Attached is a picture:

Tracon Doug · 06-16-2003, 10:39 PM

Those would be the primary and backup pitot tubes......

Tracon Doug · 06-16-2003, 10:41 PM

And, right above "Evergreen Group" would be the angle of attack vane....

Looks like just what it is... a small wing.

Sentinel Chicken · 06-16-2003, 11:46 PM

So you're saying that those ARE NOT the laser cannons? Bummer, and I thought commercial aviation was getting interesting.

Back to collecting beanie babies.

ARIUS · 06-17-2003, 01:41 AM

Quote:

Originally posted by Tracon Doug
Those would be the primary and backup pitot tubes......

Generally, the pitot tube on an aircraft is an extension of the airspeed indicator. Most airplanes have them, even my 1947 Cessna 120, although the pitot is located part way down the leading edge of the wing. Simply, as the aircraft accelerates, air is forced into the pitot tube which is connected to a pressure diaphram. Increased air pressure on the diaphram causes the ASI to read hgher speeds.

On more sophisticated aircraft perhaps the pitot is used for more than just air speed?

Sentinel Chicken · 06-17-2003, 09:41 AM

Quote:

Originally posted by ARIUS
On more sophisticated aircraft perhaps the pitot is used for more than just air speed?

Like laser cannons!

ZX1100F1 · 06-19-2003, 09:48 PM

Quote:

Originally posted by ARIUS
Generally, the pitot tube on an aircraft is an extension of the airspeed indicator.

On more sophisticated aircraft perhaps the pitot is used for more than just air speed?

I hear you there buddy. I have alwaysed considered my foot an extension of my kids ass.

And you are correct. One pitot tube (on a 747-400) doubles as a localizer antenna while the other shares duty as a glideslope antenna, this way one pilot can fly the "localizer" while the other flies the "glideslope".

tdh8192 · 06-19-2003, 11:58 PM

Quote:

Originally posted by Sentinel Chicken
Like laser cannons!

Been watching the SciFi channel, have we, JP? Or maybe Fireball XL-5 reruns?

06-16-2003, 10:23 PM	#1
ba777-236 400SH Co-Owner Join Date: Apr 2002 Location: About a 40 minute drive from Toronto, Canada Posts: 5,575	747 Experts! I need help! I've seen these objects on a real 747 nose and in pictures but have never know what they are. So what are these things on the aircraft nose? Are they some sorta antenna's or something? Any help would be appreciated, Faheem Attached is a picture:

06-16-2003, 10:39 PM	#2
Tracon Doug Vector For Spacing Join Date: Mar 2000 Location: Portland, Oregon Age: 51 Posts: 857	Those would be the primary and backup pitot tubes...... __________________ Piss On Noise Abatement! Doug Kenaga Portland TRACON Dallas/Fort Worth TRACON SoCal TRACON Los Angeles TRACON

06-16-2003, 10:41 PM	#3
Tracon Doug Vector For Spacing Join Date: Mar 2000 Location: Portland, Oregon Age: 51 Posts: 857	And, right above "Evergreen Group" would be the angle of attack vane.... Looks like just what it is... a small wing. __________________ Piss On Noise Abatement! Doug Kenaga Portland TRACON Dallas/Fort Worth TRACON SoCal TRACON Los Angeles TRACON

06-16-2003, 11:46 PM	#4
Sentinel Chicken Go-Getters Go Ozark Join Date: Jan 2001 Location: DFW/THE GREAT STATE OF TEXAS Posts: 4,167	So you're saying that those ARE NOT the laser cannons? Bummer, and I thought commercial aviation was getting interesting. Back to collecting beanie babies. __________________ *Piss on noise abatement!*

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