B767-300 and 300 ER
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Aircraft Equipment Problem Critical
Air Traffic Control Issued New Clearance; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Took Evasive Action
Aircraft
In cruise flight at FL390; the right pack failed. While complying with the QRH procedure for this abnormal condition; the aural master warning sounded for high cabin altitude; with accompanying master warning lights. Cabin altitude was not controllable. We initiated a descent to 10000 feet. We ascertained from the flight attendants that all passengers and crew were OK; and landed uneventfully. Excellent job by FO (First Officer) and the entire cabin crew.
B767-300ER Captain reported losing control of cabin pressure following the failure of the right pack.