The first grounding occurred on Feb 1 after a malfunction was registered by the crew of B787 (VT-ANX) during engine start to operate flight AI-132 from London to Bengaluru. The incident was critical as the fuel control switch locking mechanism has been at the centre of the investigation into the June 12 Air India Ahmedabad crash.

Air India said on Thursday it was investigating if its crew followed all compliance procedures when a Boeing jet took off from London with a possible fuel-switch defect, only to be later grounded in I...