By Santanu Choudhury 

NEW DELHI--An Indian air force C-130J Super Hercules transport plane crashed Friday, killing all five crew members in the latest of a string of military accidents which has killed more than 20 people and has some wondering whether the south Asian nation is having trouble managing all its new military equipment.

The plane crashed in the central state of Madhya Pradesh during a training mission. It was the first fatal accident in India involving the Lockheed Martin Corp. C-130J, said an air force spokesman. India started using the planes just three years ago.

The latest air force accident comes on the tail of a series of fatal accidents in the Indian navy over the last eight months.

"The navy is caught in a downward spiral at the moment where any mishap is going to be linked to the recent problems," said James Hardy, Asia-Pacific editor for IHS Jane's Defence Weekly. "If the air force started losing more new kit, then yes, we'd be asking questions about maintenance and training."

India recently got to use the new planes to help its neighbors by deploying two of its six C-130J planes in the search for the Malaysia Airlines Flight 370. The planes are equipped with infrared detection sensors which help in long-range navigation and surveillance.

The air force spokesman said he didn't know if the one that crashed Friday was one of those used in the search for the Malaysia Airlines jet.

India's armed forces have been hit by a number of accidents of late.

Earlier this month, an engineer was killed in an accident at a construction site building a submarine for the navy. Last month, a naval commander died from a gas leak in an under-construction destroyer in a shipyard in Mumbai. On Feb. 26, the country's naval chief, Admiral D.K. Joshi, resigned to take responsibility for the accidents, including a fire on a submarine earlier that day that left two crew members dead.

The most damaging accident for the navy happened last August when 18 sailors died after explosions and a fire swept through a submarine in a Mumbai dockyard.

India has been spending billions to upgrade its Soviet-era weaponry by adding new guns, tanks, ships and aircraft to face a more belligerent China, and its longtime rival, Pakistan.

While India has become the world's biggest arms importer in recent years, military experts said the recent accidents aren't necessarily caused by its spending spree.

"We know India is adding new equipment, but I don't think there is an overstretch of resources," said Kapil Kak, a retired air vice marshal of the Indian air force. "We will need to wait for the outcome of the inquiry to know whether there was any human error or whether there was other issues with the (new C-130J) plane."

If anything, India should see fewer accidents as it spends more on military equipment. It is often the older military equipment that India that is trying to replace which causes trouble.

The air force has been phasing out the Soviet-era MiG-21 fighter jet which had been its combat backbone for decades. India had so many fatal accidents with the jet that the MiG-21 was nicknamed the flying coffin. In 2012, India announced that more than 200 people had lost their lives in accidents with the MiG series of aircrafts since 1971.

The air force had been hoping that the body count would go down with the many new planes it has been purchasing-including Russia's Sukhoi Su-30 fighter jets, Boeing Co.'s P-8I long-range maritime patrol and anti-submarine warfare jets and the C-130J which crashed Friday.

"It is an extremely tragic accident and a huge loss to the air force as it was a state-of-the-art machine that was configured to meet the strategic requirements of India's special forces," said Mr. Kak, the retired air vice marshal. "I am stunned by this accident."

Write to Santanu Choudhury at santanu.choudhury@wsj.com

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