The crash of a plane in Indonesia carrying more than 60 people comes at a difficult time for the aviation giant Boeing, which has seen its reputation battered by years of investigations over deadly crashes.

While the authorities are still looking for the cause, the plane that crashed on Saturday near Jakarta, the Indonesian capital, was a 26-year-old 737-500, a workhorse model with a good safety record. The plane at center of the Boeing crisis was the 737 Max, a later version with faulty antistall software that led to two deadly crashes.

Here is what to know about the Boeing plane in the Indonesia crash.

It is unclear what caused the crash. Sriwijaya Air Flight 182, which was traveling to the city of Pontianak on the island of Borneo, took off amid a heavy monsoon season rain, following a bad weather delay. It plunged more than 10,000 feet in less than a minute, according to the tracking site Flightradar24.

Indonesia, an archipelago nation of thousands of islands, is heavily dependent on air travel, and has a long history of aviation accidents. The plane that crashed on Saturday was operated by Sriwijaya Air, which had not had a single fatal crash since it began operations in 2003.

The Boeing plane that lost contact Saturday shortly after takeoff from Jakarta was a Boeing 737-500, a proven model developed in the 1980s, and not the troubled 737 Max airliner, which was grounded after deadly crashes in 2018 and 2019.

The plane involved in the crash on Saturday is an earlier model of the 737, and it had been in operation for 26 years. It was previously flown by Continental Airlines and United Airlines before it was delivered to Sriwijaya Air in 2012, according to the Airfleets online database.

The 737-500 does not share the same antistall system as the 737 Max, which was triggered in the 2018 crash of another Indonesian flight, Lion Air Flight 610, killing all 189 people aboard. The same system was blamed in the crash of a 737 Max in Ethiopia in March 2019, which killed 157.

Those crashes forced the grounding of the Max fleet worldwide and a crisis for Boeing. The company fired its chief executive and said last year the Max grounding would cost it more than $18 billion, a sharp blow even before the coronavirus pandemic pummeled the industry.

Last week, the company said it had agreed to pay $2.5 billion, including $500 million for a victims fund, to resolve a criminal conspiracy charge to defraud the Federal Aviation Administration over evaluation of the 737 Max.

The troubled 737 Max resumed flying last month, with American Airlines Flight 718 making the first commercial flight of the plane after the F.A.A. lifted its grounding order in November. Before they are permitted to fly again, each 737 Max aircraft must have its wiring and software modified.

The 737-500 was introduced with the purchase of 20 planes in 1987 by Southwest Airlines. The airline used the model, with a capacity of 122, to more efficiently handle longer routes with a smaller number of passengers, Southwest’s corporate historian, Richard West, wrote in 2016. That need dropped as its long-haul travel business increased, and Southwest’s last 737-500 flew in September 2016.

Historically, the 737-500 has been a safe plane to fly. The series it belongs to, which includes the 737-300 and 737-400, has had 19 fatal accidents over more than three decades in operation, or about one fatal accident for every four million departures, according to a 2019 Boeing report.

Four previous fatal accidents have been recorded in the 737-500, including crashes in South Korea in 1993, Tunisia in 2002 and in Russia in 2008 and 2013, according to the Aviation Safety Network.

Boeing manufactured 389 of the 737-500 before the model was discontinued. As many as 100 remain in use by smaller airlines around the world in countries including Afghanistan, Iran, Nigeria, Russia and Ukraine, according to the tracking website Planespotters.net.

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