Narrative:

A few seconds after V1 the cockpit filled with smoke. I called smoke then captain said continue. Captain [called for] an immediate return and put on his mask. By about 500 feet the captain had his mask on and I asked him to take controls so I could put my mask on then took controls back. At this point the cockpit really got separated. I noticed a lav smoke EICAS message. I started a right turn for a right downwind while climbing to 1500 feet while managing flight path and speed. Captain performed after takeoff checklist on downwind while doing other stuff. We ran no emergency checklist because there was no time. I performed a visual landing and we were probably airborne no longer than 5 minutes. The captain did a great job coordinating everything in such a short period of time. Once we had the aircraft stopped on the runway I made the remain seated PA and we evaluated the situation with fas; fire rescue; and ATC. We concluded there was no fire at this point and performed a normal taxi to gate. At the gate maintenance came on board and immediately indicated they knew what the problem was. They said the engines were borescoped last night and too much of some compound or chemical was put in the engine. This excessive compound/chemical started to burn off just after V1 producing the smoke. If this turns out to be the cause then maintenance needs to update their SOP to include a high power engine run after performing that procedure. This will ensure this will never happen again on a flight full of passengers.

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Original NASA ASRS Text

Title: B757 flight crew reported smoke in the cockpit during takeoff. Oxygen masks were donned and the flight returned to the departure airport.

Narrative: A few seconds after V1 the cockpit filled with smoke. I called smoke then Captain said continue. Captain [called for] an immediate return and put on his mask. By about 500 feet the Captain had his mask on and I asked him to take controls so I could put my mask on then took controls back. At this point the cockpit really got separated. I noticed a LAV SMOKE EICAS message. I started a right turn for a right downwind while climbing to 1500 feet while managing flight path and speed. Captain performed after takeoff checklist on downwind while doing other stuff. We ran no emergency checklist because there was no time. I performed a visual landing and we were probably airborne no longer than 5 minutes. The Captain did a great job coordinating everything in such a short period of time. Once we had the aircraft stopped on the runway I made the remain seated PA and we evaluated the situation with FAs; fire rescue; and ATC. We concluded there was no fire at this point and performed a normal taxi to gate. At the gate maintenance came on board and immediately indicated they knew what the problem was. They said the engines were borescoped last night and too much of some compound or chemical was put in the engine. This excessive compound/chemical started to burn off just after V1 producing the smoke. If this turns out to be the cause then maintenance needs to update their SOP to include a high power engine run after performing that procedure. This will ensure this will never happen again on a flight full of passengers.

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.