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BOEING 747SP (N747NA) - B747-SP21 N747NA
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BOEING 747SP (N747NA)

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B747-SP21 N747NA

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Colin Seftel
This aircraft is actually a 747SP. It's about 40' shorter than the 747-200.
Christopher Hodgson
Not an expert, but I believe it's the one with the airborne telescope fitted under the large door at the back.
Pablo Rogina
Yes, Colin Seftel you're right. It's a B747SP. We can see 3 doors on the port side (left) as one was removed due to the big door added for the telescope (which opens on flight).
The B747-200 model has 5 doors on each side.
Karl Jackson
Great shot! Would love to see the interior! NASA's website has a picture with the door open: https://www.nasa.gov/mission_pages/SOFIA/overview/index.html
skylab72
Stratospheric Observatory For Infrared Astronomy, SOFIA
A significant rebuild from the original SP...
A unique aircraft with a unique job.
Rick Rodkey
Engines seem extra long.
Stephen Jensen
Fantastic observation instrument ! Great photo !
Mark Henley
Was chief engineer on on this program for awhile after we got the aircraft mod done to install the telescope. The picture shows the aircraft with uprated -15 engines to provide the extra performance to get to altitude faster (as well as better high-altitude mission performance...). Since the telescope is pre-cooled on the ground prior takeoff, they want to get to altitude as quickly as possible before opening the door so the telescope won't go through thermal cycles. Plenty of interior pictures can be found at nasa.gov and search for "sofia interior pictures"
Karl Jackson
Thanks for the info Mark Henley!
Mark Henley
Karl Jackson - You're welcome. It was a great program to work. Got to fly on a science mission out of Palmdale to see how it all fit together.
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Data Aeromobile Origine Destinazione Partenza Arrivo Durata
01/dic/2021 B74SPalmdale Regional ()Palmdale Regional () 17:44 PST 03:50 PST (+1) 10:05
01/dic/2021 B74SPalmdale Regional ()Palmdale Regional () 04:11 PST 06:18 PST 2:06
22/nov/2021 B74SPalmdale Regional ()Palmdale Regional () 17:00 PST 02:53 PST (+1) 9:53
19/nov/2021 B74SPalmdale Regional ()Palmdale Regional () 16:48 PST 02:37 PST (+1) 9:48
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