Narrative:

First officer takeoff, maximum weight, 7 KTS tailwind on runway 32L. Well after V1, we heard 2 thumps, felt 2 thumps, no yaw. I took my right hand from my lap and touched the throttles, didn't grab them, before I realized that we were well past V1 and there was absolutely no reason to abort. If I had aborted, we'd have gone off the runway without doubt. Pretty scary -- either my incompetence or a subject to discuss in training? No tire debris, dead animal on runway at ord, tires ok landing nrt. No apparent engine damage, no engine anomalies on gauges during incident.

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Original NASA ASRS Text

Title: B747-400 CREW HEARD AND FELT 2 THUMPS ON A MAX GROSS WT TKOF AT ORD.

Narrative: FO TKOF, MAX WT, 7 KTS TAILWIND ON RWY 32L. WELL AFTER V1, WE HEARD 2 THUMPS, FELT 2 THUMPS, NO YAW. I TOOK MY R HAND FROM MY LAP AND TOUCHED THE THROTTLES, DIDN'T GRAB THEM, BEFORE I REALIZED THAT WE WERE WELL PAST V1 AND THERE WAS ABSOLUTELY NO REASON TO ABORT. IF I HAD ABORTED, WE'D HAVE GONE OFF THE RWY WITHOUT DOUBT. PRETTY SCARY -- EITHER MY INCOMPETENCE OR A SUBJECT TO DISCUSS IN TRAINING? NO TIRE DEBRIS, DEAD ANIMAL ON RWY AT ORD, TIRES OK LNDG NRT. NO APPARENT ENG DAMAGE, NO ENG ANOMALIES ON GAUGES DURING INCIDENT.

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.