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

FILE - A sign hangs at a Taco Bell on May 23, 2014, in Mount Lebanon, Pa. Declaring a mission to liberate "Taco Tuesday" for all, Taco Bell asked U.S. regulators Tuesday, May 16, 2023, to force Wyoming-based Taco John's to abandon its longstanding claim to the trademark. (AP Photo/Gene J. Puskar, File)
Hepatitis A confirmed in Taco Bell worker in Everett, Lake Stevens

The health department sent out a public alert for diners at two Taco Bells on May 22 or 23.

VOLLI’s Director of Food & Beverage Kevin Aiello outside of the business on Friday, May 19, 2023 in Marysville, Washington. (Olivia Vanni / The Herald)
Coming soon to Marysville: indoor pickleball, games, drinks

“We’re very confident this will be not just a hit, but a smash hit,” says co-owner Allan Jones, who is in the fun industry.

Detectives: Unresponsive baby was exposed to fentanyl at Everett hotel

An 11-month-old boy lost consciousness Tuesday afternoon. Later, the infant and a twin sibling both tested positive for fentanyl.

Cassie Franklin (left) and Nick Harper (right)
Report: No wrongdoing in Everett mayor’s romance with deputy mayor

An attorney hired by the city found no misuse of public funds. Texts between the two last year, however, were not saved on their personal phones.

Firearm discovered by TSA officers at Paine Field Thursday morning, May 11, 2023, during routine X-ray screening at the security checkpoint. (Transportation Security Administration)
3 guns caught by TSA at Paine Field this month — all loaded

Simple travel advice: Unpack before you pack to make sure there’s not a gun in your carry-on.

Heavy traffic northbound on 1-5 in Everett, Washington on August 31, 2022.  (Kevin Clark / The Herald)
To beat the rush this Memorial Day weekend, go early or late

AAA projects busy airports, ferries and roads over the holiday weekend this year, though still below pre-pandemic counts.

Logo for news use featuring the municipality of Snohomish in Snohomish County, Washington. 220118
Troopers: DUI crash leaves 1 in critical condition in Maltby

A drunken driver, 34, was arrested after her pickup rear-ended another truck late Tuesday, injuring a Snohomish man, 28.

Housing Hope CEO Donna Moulton raises her hand in celebration of the groundbreaking of the Housing Hope Madrona Highlands on Tuesday, May 23, 2023 in Edmonds, Washington. (Olivia Vanni / The Herald)
$30M affordable housing project to start construction soon in Edmonds

Once built, dozens of families who are either homeless or in poverty will move in and receive social and work services.

A south-facing view of the proposed site for a new mental health facility on Thursday, Oct. 13, 2022, near 300th Street NW and 80th Avenue NW north of Stanwood, Washington. (Olivia Vanni / The Herald)
County Council OK’s Stanwood behavioral health center

After an unsuccessful appeal to block it, the Tulalip Tribes are now on the cusp of building the 32-bed center in farmland.

Most Read