Narrative:

Mx was finishing up an inspection on aircraft X. After the inspection was complete and I was finished auditing the inspection package; I received a phone call that our aircraft had been 'booked' for a revenue trip. I called for a fuel truck to upload 50K pounds of fuel onto aircraft X and then went outside to wait for the fuel truck.a FBO worker (who supplies our fuel) showed up to take a metro-liner back down to the FBO; so I asked him when a fuel truck would be down to fuel aircraft X. He stated that he was backed up right now; but that he would be down in a bit. He then asked if aircraft X would need de-iced. I told him yes; to please de-ice the wings and tail. He then asked if he should de-ice the engine inlets too and I replied 'yes' a second time.I then went up a flight of stairs into the cockpit to make sure all of the avionics equipment was turned on and warming up as a revenue trip had been booked. When I was exiting the cockpit; but still at the top of the set of stairs; [personnel] in operations texted me and asked if aircraft X needed de-iced before it departed. I responded 'yes' and sent 2 pictures of aircraft X's left wing; which has snow on it. [The ops personnel] then responded 'okay; thanks.'I then went inside to sign off the inspection and in the airworthiness section on the same log page. After that paperwork was completed; I left work and went home. At approximately xa am the next morning; I received a text from chief flight engineer that the on-call weekend mechanic should go into work and look at the engines for possible FOD. I instructed the mechanic to do just that and he found the number 1 engine with FOD to the C1 and C2 disk blades. When I received this news I asked the chief flight engineer if the flight crew had de-iced aircraft X after I left but prior to departure. He stated that the flight crew did not de-ice. He was with the aircraft all day and witnessed it takeoff so he would know.I'm not certain if I violated any fars by signing off the inspection before the aircraft was de-iced but I wanted to document this in case I had and ice from the aircraft caused the damage to the number 1 engine. The number 1 engine is being replaced at this time and we hope to have the aircraft back in service safely within a few days. I have no idea why the flight crew canceled my request to de-ice aircraft X; but I wish they hadn't.

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Original NASA ASRS Text

Title: Two air carrier Technicians and flight crew reported engine damage caused by possible ice FOD during takeoff. Reportedly; the aircraft had been sitting in freezing rain for two days and was not de-iced prior to takeoff.

Narrative: MX was finishing up an inspection on Aircraft X. After the inspection was complete and I was finished auditing the inspection package; I received a phone call that our aircraft had been 'booked' for a revenue trip. I called for a fuel truck to upload 50K LBS of fuel onto Aircraft X and then went outside to wait for the fuel truck.A FBO worker (who supplies our fuel) showed up to take a metro-liner back down to the FBO; so I asked him when a fuel truck would be down to fuel Aircraft X. He stated that he was backed up right now; but that he would be down in a bit. He then asked if Aircraft X would need de-iced. I told him yes; to please de-ice the wings and tail. He then asked if he should de-ice the engine inlets too and I replied 'yes' a second time.I then went up a flight of stairs into the cockpit to make sure all of the avionics equipment was turned on and warming up as a revenue trip had been booked. When I was exiting the cockpit; but still at the top of the set of stairs; [personnel] in Operations texted me and asked if Aircraft X needed de-iced before it departed. I responded 'YES' and sent 2 pictures of Aircraft X's left wing; which has snow on it. [The Ops personnel] then responded 'Okay; thanks.'I then went inside to sign off the inspection and in the Airworthiness section on the same log page. After that paperwork was completed; I left work and went home. At approximately XA AM the next morning; I received a text from Chief Flight Engineer that the on-call weekend mechanic should go into work and look at the engines for possible FOD. I instructed the mechanic to do just that and he found the Number 1 engine with FOD to the C1 and C2 disk blades. When I received this news I asked the Chief Flight Engineer if the flight crew had de-iced Aircraft X after I left but prior to departure. He stated that the flight crew did not de-ice. He was with the aircraft all day and witnessed it takeoff so he would know.I'm not certain if I violated any FARs by signing off the inspection before the aircraft was de-iced but I wanted to document this in case I had and ice from the aircraft caused the damage to the Number 1 engine. The Number 1 engine is being replaced at this time and we hope to have the aircraft back in service safely within a few days. I have no idea why the flight crew canceled my request to de-ice Aircraft X; but I wish they hadn't.

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.