Narrative:

During a normal approach and landing (captain's leg) the #1 reverse abruptly returned to the full reverse position at 90 KTS. The fuel flow pegged off the scale, N1 and N2 began winding down. I advised the captain that #1 appeared to be flamed out. He immediately secured the engine with fuel shutoff switch and continued to control the aircraft and turned off the runway at A2. At that point, narita tower transmitted ' you have smoke.' as we turned onto the parallel taxiway, I confirmed the smoke and sighted a grass fire along the outside of the runway. I then called for firefighting equipment as the captain stopped the aircraft. The interphone rang and the so answered it, but no one responded. He hung up the interphone and it immediately rang again. This time a flight attendant announced that there was smoke on the #1 engine. We completed the engine fire failure checklist for #1 engine and shut down the #2 normally as the firefighting approached the aircraft. At no time was there any indication of fire in the cockpit. We even checked the continuity of the fire detection system. After a series of communications with the tower and company, we finally determined that the engine had separated from the aircraft and coordinated with the company for stairs and buses. During this time, we maintained communications with the lead flight attendant and the captain made a PA to remain seated and stay calm. We then made an announcement to deplane the aircraft through doors 1R and 2R. No one was injured.

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Original NASA ASRS Text

Title: ACR WDB, A 747, SUFFERS ACTUAL LOSS OF #1 ENG WHEN IT DETACHES FROM WING DURING LNDG PROC ROLLOUT REVERSING.

Narrative: DURING A NORMAL APCH AND LNDG (CAPT'S LEG) THE #1 REVERSE ABRUPTLY RETURNED TO THE FULL REVERSE POS AT 90 KTS. THE FUEL FLOW PEGGED OFF THE SCALE, N1 AND N2 BEGAN WINDING DOWN. I ADVISED THE CAPT THAT #1 APPEARED TO BE FLAMED OUT. HE IMMEDIATELY SECURED THE ENG WITH FUEL SHUTOFF SWITCH AND CONTINUED TO CTL THE ACFT AND TURNED OFF THE RWY AT A2. AT THAT POINT, NARITA TWR XMITTED ' YOU HAVE SMOKE.' AS WE TURNED ONTO THE PARALLEL TXWY, I CONFIRMED THE SMOKE AND SIGHTED A GRASS FIRE ALONG THE OUTSIDE OF THE RWY. I THEN CALLED FOR FIREFIGHTING EQUIP AS THE CAPT STOPPED THE ACFT. THE INTERPHONE RANG AND THE SO ANSWERED IT, BUT NO ONE RESPONDED. HE HUNG UP THE INTERPHONE AND IT IMMEDIATELY RANG AGAIN. THIS TIME A FLT ATTENDANT ANNOUNCED THAT THERE WAS SMOKE ON THE #1 ENG. WE COMPLETED THE ENG FIRE FAILURE CHKLIST FOR #1 ENG AND SHUT DOWN THE #2 NORMALLY AS THE FIREFIGHTING APCHED THE ACFT. AT NO TIME WAS THERE ANY INDICATION OF FIRE IN THE COCKPIT. WE EVEN CHKED THE CONTINUITY OF THE FIRE DETECTION SYS. AFTER A SERIES OF COMS WITH THE TWR AND COMPANY, WE FINALLY DETERMINED THAT THE ENG HAD SEPARATED FROM THE ACFT AND COORDINATED WITH THE COMPANY FOR STAIRS AND BUSES. DURING THIS TIME, WE MAINTAINED COMS WITH THE LEAD FLT ATTENDANT AND THE CAPT MADE A PA TO REMAIN SEATED AND STAY CALM. WE THEN MADE AN ANNOUNCEMENT TO DEPLANE THE ACFT THROUGH DOORS 1R AND 2R. NO ONE WAS INJURED.

Data retrieved from NASA's ASRS site as of July 2007 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.