A B767-300ER flight crew opted to return to their departure airport for maintenance when both the ri...

Narrative:

During takeoff roll; above 100 knots; the left engine prv EICAS message illuminated with an left engine bleed light and status message. Followed QRH procedures and turned off the left engine bleed. Called dispatch and maintenance control and agreed to continue to our destination. Approximately two hours into the flight at FL340 we got the right engine 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 right engine 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.

Original NASA ASRS Text

Title: 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.

Narrative: 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.

Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1131666
Time
Date	201311
Place
Locale Reference	ZZZ.ARTCC
State Reference	FO
Aircraft 1
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Pneumatic Valve/Bleed Valve
Person 1
Function	First Officer
Events
Anomaly	Aircraft Equipment Problem Critical

A B767-300ER flight crew opted to return to their departure airport for maintenance when both the right engine hpsov (pneumatic high pressure shut off valve) and the left engine prv (pneumatic pressure regulating valve) EICAS warnings illuminated.