Several passengers on a Jet Airways Mumbai-Jaipur flight suffered nose and ear bleeding on Thursday morning as the crew forgot to switch on the system to maintain cabin pressure, the DGCA said. “The 9W 697 Mumbai-Jaipur flight was turned back to Mumbai after take off as, during the climb, crew forgot to select switch to maintain cabin pressure. This resulted in the oxygen masks dropping. Thirty out of 166 passengers experienced nose and ear bleeding, some also complained of headache,” Lalit Gupta, deputy director general, Directorate General of Civil Aviation (DGCA), said. The crew has been taken off duty and Aircraft Accident Investigation Bureau (AAIB) has started an investigation, DGCA added. The passengers are being treated at Mumbai airport.