B767-300 and 300 ER
Situational Awareness
Aircraft Equipment Problem Critical
Flight Crew Returned To Departure Airport
Aircraft
During takeoff roll; above 100 knots; the L ENG PRV EICAS message illuminated with an L ENG BLEED light and status message. Followed QRH procedures and turned off the L ENG Bleed. Called Dispatch and Maintenance control and agreed to continue to our destination. Approximately two hours into the flight at FL340 we got the R ENG HPSOV EICAS message with associated status message. Right pneumatic duct pressure remained stable and normal at 39 PSI. The QRH directed to turn off the R ENG bleed air switch. The Captain elected to leave it on; avoiding depressurization. We began a precautionary descent and cranked the APU. We also began a divert to the closest airport with facilities. After again talking to Dispatch and Maintenance the Captain elected to divert to return to our departure airport due to facilities and 767 maintenance availability. We flew the return leg at FL240 with no pressurization problem. On descent; the Captain elected to shut off the right bleed in accordance with the QRH. The APU was then used for pneumatics. We landed uneventfully below max landing weight.
A B767-300ER flight crew opted to return to their departure airport for maintenance when both the R ENG HPSOV (pneumatic High Pressure Shut Off Valve) and the L ENG PRV (pneumatic Pressure Regulating Valve) EICAS warnings illuminated.