A pilot on a long test flight decided to take out his frustration in the air by spelling out “I’m bored” on his tracking device.

The pilot, a recently qualified instructor at Flight Training Adelaide, was testing out a new engine when he spelled out the message.

He was tasked with flying the single propeller aircraft for two hours at a single speed, according to Adelaide Now. The letters were "dozens of kilometres" in length.

He left South Australia’s Parafield Airport before 9am yesterday morning, and returned just after 12pm, said the newspaper.

The “I’m bored” shape was only visible on his tracking device, and wouldn’t have been visible from the ground.

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The pilot also went one step further to show his disdain for the test flight, by drawing what look like phallic symbols alongside the “I’m bored” shapes.

Pine Pienaar, the director of Flight Training Adelaide, said that the school didn’t condone the pilot’s actions – but that “apparently he got bored”.

“Young instructors, what can you do?” Pienaar added.