Narrative:

13 yr employee -- captain/flight instructor/IOE instructor. 3 month employee -- first officer on IOE training, 27 hours experience in type and with company. I was flying a visual approach to runway 34R at seatac. The approach was normal, on airspeed and on altitude. During the flare, power was pulled off and the aircraft ballooned a little bit. The airspeed got a little slow, about 4-5 KTS below vref. The landing that ensued was moderately firm but not abnormally hard. After the initial landing, the aircraft bounced into the air. The captain then put his hands on the controls and told me to 'check.' during our 17 hours of previous training 'check' had always meant to pull back on the yoke a little bit. I pulled back on the yoke slightly and the aircraft settled to the ground. During the postflt, damage to the underside of aircraft was noticed. Metal was worn on the underside, 2 antennas were destroyed. The damaged area was between the area behind the flaps up to the drain mast. The tail skid was not damaged. The aircraft was at a heavy landing weight. Flight attendants and passenger did not seem to notice that the aircraft had been damaged.

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Original NASA ASRS Text

Title: AN ACR B737-400 FO SCRAPED THE BELLY ON LNDG. ACFT DAMAGE FUSELAGE SKIN, 2 ANTENNAS. ERROR ADMITTED.

Narrative: 13 YR EMPLOYEE -- CAPT/FLT INSTRUCTOR/IOE INSTRUCTOR. 3 MONTH EMPLOYEE -- FO ON IOE TRAINING, 27 HRS EXPERIENCE IN TYPE AND WITH COMPANY. I WAS FLYING A VISUAL APCH TO RWY 34R AT SEATAC. THE APCH WAS NORMAL, ON AIRSPD AND ON ALT. DURING THE FLARE, PWR WAS PULLED OFF AND THE ACFT BALLOONED A LITTLE BIT. THE AIRSPD GOT A LITTLE SLOW, ABOUT 4-5 KTS BELOW VREF. THE LNDG THAT ENSUED WAS MODERATELY FIRM BUT NOT ABNORMALLY HARD. AFTER THE INITIAL LNDG, THE ACFT BOUNCED INTO THE AIR. THE CAPT THEN PUT HIS HANDS ON THE CTLS AND TOLD ME TO 'CHK.' DURING OUR 17 HRS OF PREVIOUS TRAINING 'CHK' HAD ALWAYS MEANT TO PULL BACK ON THE YOKE A LITTLE BIT. I PULLED BACK ON THE YOKE SLIGHTLY AND THE ACFT SETTLED TO THE GND. DURING THE POSTFLT, DAMAGE TO THE UNDERSIDE OF ACFT WAS NOTICED. METAL WAS WORN ON THE UNDERSIDE, 2 ANTENNAS WERE DESTROYED. THE DAMAGED AREA WAS BTWN THE AREA BEHIND THE FLAPS UP TO THE DRAIN MAST. THE TAIL SKID WAS NOT DAMAGED. THE ACFT WAS AT A HVY LNDG WT. FLT ATTENDANTS AND PAX DID NOT SEEM TO NOTICE THAT THE ACFT HAD BEEN DAMAGED.

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.