Tony Stark takes his Mark II suit for a test flight, ignoring J.A.R.V.I.S.'s advice. He simply takes off to test the suit's capabilities. He then attempts to beat the SR-71's record of 85,000 feet. As he soars into the sky, ice builds up and the suit temporarily loses power. After manually deploying flaps, the suit eventually regains power and crash lands into his garage.
⌛ Timestamp in the movie :
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01:02:11
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01:04:54