SEATTLE—Pratt & Whitney is examining an ‘anomaly’ on a version of the geared turbofan which forced one of the company’s two Boeing 747SP flying testbeds to make a precautionary landing at its Mirabel Aerospace Centre in Canada.

The incident, which occurred on April 29, is thought to have involved a test version of the PW1100G in final development for the Airbus A320neo. Pratt & Whitney says “we did experience a minor anomaly with a test engine during flight testing. The engine was shut down as a precaution. Examination of the engine revealed that there was no apparent damage and we expect to run it again in the next day or two.”

The company, which plans to supply the first two production conforming engines to Airbus later this summer, adds that “minor anomalies such as this are common in flight test.” Pratt also says reports of a fire on the engine are inaccurate. “As a matter of policy, and for proprietary reasons, we do not reveal which engine was being tested.”

Sister company Pratt & Whitney Canada says during the incident “the Mirabel airport tower notified the crew of Pratt & Whitney’s flying test bed that it noticed a potential abnormal operation of one of its engines shortly after take-off during a routine test flight.  As a precaution, the pilots decided to return to the airport and landed. There was no fire or emergency declared. On landing, no visual damage was apparent.”