Narrative:

Left oil temp started fluctuating. Left wing tank fuel temp approximately 32 [degrees] celsius. [I] thought that a fuel heat valve was possibly cycling without illuminating. Left engine oil quantity indicated 13 quarts with no fluctuation. Pulled up the 'oil temperature high' QRH procedure just in case we started having a high oil temperature indication. After navigating to the 'oil temperature high' QRH procedure; the oil temperature made its first excursion to approximately 135 [degrees] celsius. We executed the 'oil temperature high' QRH procedure and initially thought we were regaining control of the oil temperature. Then during the execution of the procedure the oil temp spiked through 165 [degrees] celsius and then became erratic eventually indicating somewhere between 193 [degrees] celsius to 199 [degrees] celsius. We went to step 2 of the 'oil temperature high QRH' and executed the 'oil temperature exceeds 165 [degrees] celsius at any time' portion of the checklist. This directed us to the 'in-flight shutdown checklist.' the captain requested a descent to 10;000 ft. After determining that there were no significant obstruction or terrain threats. We completed the 'single engine operation checklist' and then were directed to the 'non-routine landing considerations checklist.' we were able to contact dispatch; operations; and informed the flight attendants and passengers that we would be making a 'precautionary landing' as per the non-routine landing considerations. We acquired a discrete arff frequency from center to use upon landing. The single engine approach and landing was completed uneventfully. After landing; the captain set the parking brake; stowed the spoilers; and made a PA to the passengers to remain seated while I coordinated an inspection from arff. Arff vehicles inspected our left engine for smoke/fire/fluid leakage and reported no anomalies. We were escorted to the gate by ground vehicles. Operations personnel were in place and ready to accept the aircraft and passengers upon arrival.

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Original NASA ASRS Text

Title: MD-83 flight crew reported diverting to an alternate airport after an inflight shutdown related to high oil temperature in the left engine.

Narrative: Left oil temp started fluctuating. Left wing tank fuel temp approximately 32 [degrees] Celsius. [I] thought that a fuel heat valve was possibly cycling without illuminating. Left engine oil quantity indicated 13 quarts with no fluctuation. Pulled up the 'oil temperature high' QRH procedure just in case we started having a high oil temperature indication. After navigating to the 'oil temperature high' QRH procedure; the oil temperature made its first excursion to approximately 135 [degrees] Celsius. We executed the 'oil temperature high' QRH procedure and initially thought we were regaining control of the oil temperature. Then during the execution of the procedure the oil temp spiked through 165 [degrees] Celsius and then became erratic eventually indicating somewhere between 193 [degrees] Celsius to 199 [degrees] Celsius. We went to step 2 of the 'oil temperature high QRH' and executed the 'oil temperature exceeds 165 [degrees] Celsius at any time' portion of the checklist. This directed us to the 'in-flight shutdown checklist.' The Captain requested a descent to 10;000 ft. after determining that there were no significant obstruction or terrain threats. We completed the 'Single Engine Operation Checklist' and then were directed to the 'Non-routine Landing Considerations Checklist.' We were able to contact Dispatch; Operations; and informed the flight attendants and passengers that we would be making a 'precautionary landing' as per the non-routine landing considerations. We acquired a discrete ARFF frequency from Center to use upon landing. The single engine approach and landing was completed uneventfully. After landing; the Captain set the parking brake; stowed the spoilers; and made a PA to the passengers to remain seated while I coordinated an inspection from ARFF. ARFF vehicles inspected our left engine for smoke/fire/fluid leakage and reported no anomalies. We were escorted to the gate by ground vehicles. Operations personnel were in place and ready to accept the aircraft and passengers upon arrival.

Data retrieved from NASA's ASRS site 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.