Narrative:

I was the PF on this leg. On takeoff roll at around 120 KTS smoke filled the cockpit. I reached up and turned off the air conditioning packs and continued the takeoff. The EICAS message read 'lav smoke.' after clean-up; the PNF (captain) pulled out his aom vol 1 and executed the appropriate procedure. The smoke dissipated and the captain verified with the flight attendant that the lav was clear of smoke. Flight attendant confirmed the lav was clear. We continued the flight without further incident.callback conversation with reporter revealed the following information: the reporter stated the emb was designed to be operated with packs on for takeoff; however a design deficiency in a seal allows engine oil into the bleed air system during high power settings. This is most common on the first takeoff of the day. Company procedure has been changed and all takeoffs are performed with packs off to prevent this problem. The captain qualified first officer failed to accomplish this item on the takeoff checklist. The reporter stated they quickly realized their mistake when the oil fumes came into the cockpit and they corrected it. The engine manufacturer is in the process of redesigning the seal.

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Original NASA ASRS Text

Title: EMB145 CREW COMPRISED OF TWO CAPTS FAILS TO TURN PACKS OFF FOR TKOF IAW COMPANY PROC.

Narrative: I WAS THE PF ON THIS LEG. ON TKOF ROLL AT AROUND 120 KTS SMOKE FILLED THE COCKPIT. I REACHED UP AND TURNED OFF THE AIR CONDITIONING PACKS AND CONTINUED THE TKOF. THE EICAS MESSAGE READ 'LAV SMOKE.' AFTER CLEAN-UP; THE PNF (CAPT) PULLED OUT HIS AOM VOL 1 AND EXECUTED THE APPROPRIATE PROC. THE SMOKE DISSIPATED AND THE CAPT VERIFIED WITH THE FLT ATTENDANT THAT THE LAV WAS CLR OF SMOKE. FLT ATTENDANT CONFIRMED THE LAV WAS CLR. WE CONTINUED THE FLT WITHOUT FURTHER INCIDENT.CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE EMB WAS DESIGNED TO BE OPERATED WITH PACKS ON FOR TKOF; HOWEVER A DESIGN DEFICIENCY IN A SEAL ALLOWS ENG OIL INTO THE BLEED AIR SYSTEM DURING HIGH POWER SETTINGS. THIS IS MOST COMMON ON THE FIRST TKOF OF THE DAY. COMPANY PROC HAS BEEN CHANGED AND ALL TKOFS ARE PERFORMED WITH PACKS OFF TO PREVENT THIS PROB. THE CAPT QUALIFIED FO FAILED TO ACCOMPLISH THIS ITEM ON THE TKOF CHKLIST. THE RPTR STATED THEY QUICKLY REALIZED THEIR MISTAKE WHEN THE OIL FUMES CAME INTO THE COCKPIT AND THEY CORRECTED IT. THE ENG MANUFACTURER IS IN THE PROCESS OF REDESIGNING THE SEAL.

Data retrieved from NASA's ASRS site as of January 2009 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.