New life for old Pan Am 747

Associated Press

WACO, Texas — While many of Everett’s Boeing 747s are slowly being retired, the version that sits in a hangar about 100 miles south of Dallas is getting a facelift of astronomical proportions.

The former Pan Am passenger jet, which first flew in 1977 as the Clipper Lindbergh, has been set aside for a stratospheric mission — to look at the universe.

After engineers cut a hole in the side of the aircraft, it will house the largest airborne telescope ever built — more powerful than many ground-based telescopes and larger than the Hubble Space Telescope.

The Stratospheric Observatory for Infrared Astronomy, or SOFIA, will allow astronomers to peer deep into vast dust clouds to witness the birth of stars, observe galaxies and quasars billions of light-years away and study the very early universe.

Infrared is an invisible part of the electromagnetic spectrum that is sensed by humans as heat. Clouds of gases and dust, where new stars are born, are often difficult if not impossible to see in visible light.

Among other missions, scientists plan to fly the revamped jet to the Southern Hemisphere to observe the center of the Milky Way, satellite galaxies of the Milky Way, or phenomena that require urgent investigation in the infrared spectrum, such as supernovas.

Eric Becklin, an astronomy professor at the University of California at Los Angeles and SOFIA’s lead scientist, is not shy about trumpeting the prospects of the new observatory.

Becklin said SOFIA will "open up the universe" and be as big a leap in observational astronomy as was Galileo’s telescope.

NASA and its German counterpart expect to spend about $375 million developing SOFIA. Slightly more than 100 missions per year are planned over 20 years at an average of about $200,000 a flight.

As a joint project between NASA and the German Aerospace Center, scientists and engineers are modifying the airplane at a Raytheon Air Integration Systems Inc. hangar in Waco. The plane is a Boeing 747SP, a shortened, "special performance" version of the jumbo jet made by Boeing workers in Everett from the mid-1970s to late 1980s.

To do its job, SOFIA will rise above 99 percent of the atmosphere. Cruising between 41,000 and 45,000 feet in the dark of night, astronomers will open a huge portal behind the aircraft’s left wing to expose the telescope’s mirror and mounting.

Raytheon program manager Dennis Boroczk said although his teams have converted passenger planes to cargo configurations, they have been challenged by the task of cutting a large door intended to be opened in flight.

"From a production standpoint, this is like our baby," said Frank Walker, a Raytheon production manager for SOFIA. "And, yes, we worry about it from the day we start on the project until the day it’s delivered."

SOFIA will cruise at 550 mph with the door open, and the minus-40 degrees of the atmosphere should match that of the unpressurized telescope compartment, which is refrigerated before takeoff to prevent condensation from forming on the optics. A 30-inch thick pressure bulkhead will protect scientists from the near vacuum and fatal cold of the stratosphere.

Once operational at the end of 2002 or early 2003, SOFIA will be the largest airborne observatory, replacing the Kuiper Airborne Observatory, which flew aboard a Lockheed C-141 from 1974 to 1995.

At 8.25 feet in diameter, the mirror of the SOFIA telescope is slightly larger than Hubble, almost the same size as the Hooker telescope at Mount Wilson, Calif., and about eight times larger in surface area than Kuiper.

The largest optical telescope, the Keck telescope at Mauna Kea, Hawaii, is 33 feet in diameter and four times that of SOFIA, but moisture in the atmosphere severely limits Keck’s ability to study infrared targets, a problem for all ground telescopes.

"Water just loves to absorb infrared radiation," Becklin said. "SOFIA flies above most of the absorbing water and catches the photons before they get absorbed."

Copyright ©2000 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

Talk to us

More in Local News

Construction crews demolish public housing  homes at the Baker Heights in Everett’s Delta Neighborhood on Tuesday, June 8, 2021 in Everett, Washington.  (Chuck Taylor / The Herald)
Baker Heights site no longer on the table for WSU expansion

As demolition proceeds, it’s unclear what the Everett Housing Authority will do with roughly 10 acres.

Rick Steves has supported a number of local projects with donations of $1 million or more.  (Dan Bates / The Herald)
Travel guru Rick Steves will be Edmonds parade grand marshal

The Edmonds Chamber was finally able to honor the native son now that the pandemic is keeping him home.

A house fire displaced seven people and killed one dog Saturday, June 12, 2021, on Chain Lake Road in Monroe. (Snohomish Regional Fire & Rescue)
7 displaced as family escapes Monroe house fire, dog killed

People honked to alert three occupants of the home to flames Saturday morning.

Detectives investigate killing of woman, 23, in Smokey Point

She had “obvious signs of trauma,” according to the sheriff’s office. A 25-year-old man was arrested.

Woman injured after shooting at south Everett 7-Eleven

She was taken to a hospital and was expected to survive. The suspects fled the scene.

Vandalism in Lake Stevens prompts city to install cameras

Park bathrooms have been the main targets. The mayor hopes surveillance and watchful citizens will be deterrents.

FILE - In this May 26, 2020, file photo, a sign at the headquarters for the Washington state Employment Security Department is shown at the Capitol in Olympia, Wash. Washington state's rush to get unemployment benefits to residents who lost jobs due to the coronavirus outbreak left it vulnerable to criminals who made off with hundreds of millions of dollars in fraudulent claims. (AP Photo/Ted S. Warren, File)
State’s unemployment recipients must look for work after July 4

The change comes after Washington reported the third straight weekly decline in jobless claims.

One-time payments of $1,250 proposed for some county workers

Another proposal by County Executive Somers would boost hourly pay by $4 for grocery store workers.

Shinji Maeda steps out of his plane waving American and Japanese flags after completing his round-the-world tour that took him to 18 different countries on Friday, June 11, 2021 in Snohomish, Wa. (Olivia Vanni / The Herald)
After 22,000 miles and 18 countries, he landed in Snohomish

Partially blind Japanese native Shinji Maeda came to the U.S. to become an aviator. Then he toured the world.

Most Read