Residents in Weston Hills will have to wait longer than originally thought to find out why a US military aircraft crashed in a field near their homes and a school.
Witnesses described the F-15D spiralling out of control and coming down off Broad Gate at about 3.30pm on October 8 last year.
The pilot was recovered by helicopter, having ejected and parachuted to safety, and there were no injuries on the ground.
For days the site remained under close guard and a wide cordon as a board of investigators from RAF Lakenheath began assessing the wreckage of the two-seater £20-million craft.
It was expected a report would be issued by the Air Accidents Investigations Branch in 60 to 90 days – which would have been last month.
However, a spokeman for the USAF told the Spalding Guardian that the complexity of the investigation has made “identifying a timeline impossible”.
SSgt Thomas Trower said: “Due to the need for a thorough report, the investigation operates independently of the base and does not release any information until a full report is available.
“The complexity of the investigation makes identifying a timeline impossible, but as soon as this report is available, our headquarters, U.S. Air Forces in Europe, will release it to the public.
“Our F-15 fighter squadrons are conducting operations throughout the region, and as always, safety is our top priority. The Air Force’s constant and stringent safety standards help ensure the wellbeing of our people and the communities we interact with. Strong relationships have been built between the base and our neighbours in the UK community over many years, and we remain committed to preserving them.”