B757 flight crew experiences erratic engine indications in cruise with a status message; left engine...

Narrative:

After about 45 minutes in cruise [we] had very erratic and erroneous left engine indications. N3 erratic and surging; N2 erratic. Left bleed pressure fluctuated from 0 to 60 psi; left engine bleed light on with loss of pressure and pack off light as well; left and center hydraulic pressure fluctuated from about 3090 to well over 3200 psi. Right [was] also fluctuated. Status message; left engine speed card illuminated. Left engine center fuel pump pressure light [was] on with 3;000 pounds of fuel in tank. We were going to an airport where weather was not good so we diverted to nearest suitable airport.

Original NASA ASRS Text

Title: B757 flight crew experiences erratic engine indications in cruise with a Status Message; left engine speed card. With no QRH guidance available; the crew elects to divert to the nearest suitable airport.

Narrative: After about 45 minutes in cruise [we] had very erratic and erroneous left engine indications. N3 erratic and surging; N2 erratic. Left bleed pressure fluctuated from 0 to 60 PSI; left engine bleed light on with loss of pressure and pack off light as well; left and center hydraulic pressure fluctuated from about 3090 to well over 3200 PSI. Right [was] also fluctuated. Status message; left engine speed card illuminated. Left engine center fuel pump pressure light [was] on with 3;000 LBS of fuel in tank. We were going to an airport where weather was not good so we diverted to nearest suitable airport.

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	1039791
Time
Date	201209
Aircraft 1
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Component
Aircraft Component	Fuel Control Computer
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	First Officer
Events
Anomaly	Aircraft Equipment Problem Critical

B757 flight crew experiences erratic engine indications in cruise with a status message; left engine speed card. With no QRH guidance available; the crew elects to divert to the nearest suitable airport.