Many satellites are operating well past their life expectancy, so much so that manufacturers are hurting from lack of demand for new, replacement satellites.

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LOS ANGELES — If only cars could last so long.

A satellite resembling a shiny spinning drum and orbiting 21,156 miles above the Earth celebrated its 41st birthday last month, astounding engineers and scientists, some of them the children of those who built it.

For years, the satellite has been an emergency communications link for rescue operations, including the 1985 Mexico City earthquake and the 1980 Mount St. Helens volcanic eruption.

It was supposed to live only three years when it was launched in 1967. That’s when Lyndon B. Johnson was president and bell-bottom pants were the rage.

But the spacecraft, “ATS 3,” isn’t alone. Many satellites are operating well past their life expectancy, so much so that manufacturers are hurting from lack of demand for new, replacement satellites.

And those who are buying are asking for guarantees that the new satellites, which can cost as much as $300 million each, will last two to three times as long as the early birds.

“It’s a mixed blessing,” said John S. Edwards, a space-industry analyst for Forecast International. “It says great things about your product, but the satellite-making business is floundering because there are hardly any sales.”

In El Segundo, Calif., engineers at Boeing’s sprawling satellite-making plant know about the sales drought only too well.

Of the 245 Boeing satellites launched into service, 166 have exceeded their design life.

That’s more than two-thirds of the spacecraft built at the facility since the 1960s, when it was run by Hughes Space & Communications, which Boeing bought in 2000.

One-third of all satellites have lasted at least twice as long as expected.

Only one sold in 2008

That’s been the bane of the sales department. With the telecom bust early this decade and consolidation in the satellite-services industry, Boeing has sold only one commercial satellite in 2008.

In the late 1990s, Boeing was tallying a dozen orders annually.

Some satellites are living longer because the initial estimates of their longevity were conservative, but many have operated well beyond even the wildest expectations.

“In designing them, we had to take into account all the worst-case scenarios,” said Art Rosales, Boeing’s director of commercial and civil satellite services and a 29-year veteran of the satellite business.

Because most satellites can’t be repaired once they’re in space, every contingency was considered.

“The worst cases didn’t happen and that has translated to longer life,” Rosales said.

In October, a satellite providing an Internet link for scientists at the South Pole was retired, more than three decades after it went into service. It was designed to work five years.

The longevity “has been truly remarkable,” said Kay Sears, president of a government-services subsidiary of Intelsat, a satellite operator. “No one could have ever imagined that its power supply and batteries could have lasted this long.”

In retiring the Marisat F2 satellite, Intelsat used up the remaining fuel on board to move it about 125 miles from its original orbit so it would stay out of the way of other geosynchronous satellites before its power was shut off for good.

“GEO satellites” orbit at the same speed as the Earth’s rotation, allowing them to remain stationary relative to the ground.

They are often used for communications, working like giant radio-transmission towers relaying signals from one place on Earth to another.

Intelsat’s Marisat joined a cadre of about 2,000 decommissioned satellites that orbit the Earth as space debris. Some deactivated satellites that orbit near Earth eventually burn up in the atmosphere, although fragments of some large satellites have been known to fall to the ground.

There are an estimated 800 active satellites, including those built for secret military operations.

With satellites operating much longer than anticipated, customers are expecting more from the new generation of birds, which has led to headline-grabbing setbacks.

Costly delay

Boeing suffered a $1 billion loss a few years ago after technical problems delayed the delivery of new, more powerful satellites.

Some take up to 18 months to build.

The expected life span of the early generation was three to four years. In succeeding generations, those expectations rose to 10 to 12 years.

“Nowadays, the standard design life is 15 years, and everybody expects them to last over 20 years,” said Marco Caceras, senior space analyst for the aerospace research firm Teal Group.

With even older satellites lasting more than 20 years, some engineers have become emotionally attached to them.

“It’s like raising children. They have tantrums and fits,” said Erika Roesler-Wong, regional manager for Boeing’s customer-operations support center in El Segundo, where she helps satellite owners trouble-shoot problems.

She’s kept an eye on some satellites for nearly 20 years.

When they have to be retired — many are turned off because they’re running out of fuel needed to keep them in a specific orbit — Roesler-Wong gets a bit choked up.

“It is sad,” she said. “But you need to get over it because there are other children around.”