Shortly prior to engine start the aircraft suffered an APU bleed air duct leak in the rear equipment bay. The leaking bleed air heated corrosion-inhibitor material in the rear equipment bay, resulting in scorching and the release of smoke within the main cargo deck. The flight crew shut the APU down. The cause of the bleed air leak was a failed V-band clamp that had fractured due to stress corrosion cracking. The operator is currently replacing V-band clamps at the failure location on its fleet of 737-300 and 737 400 freighter aircraft.
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Published 14 December 2017