Narrative:

The vibration write-up on aircraft X stated that flight attendant felt vibration under her feet at about row 20, while inspecting inside the aft cargo compartment I noticed the aft blowout panel had been damaged. Upon removal I noticed that a sense line had been vibrating against the floorboard by the markings visible against the floorboard. That location was approximately where row 20 lies, which made it very obvious that was the cause of the vibration the flight attendant felt. I was not aware of the airframe inspection and although not used, I feel confident that the problem was corrected accordingly. For future reference I am now aware of this inspection and will use it. Note also in the write-up the pilot noted no vibration in flight deck.

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Original NASA ASRS Text

Title: A B737-400 HAD FLOOR VIBRATION RPTED BY CABIN ATTENDANT AT ROW 20. FOUND AND CORRECTED UNSECURED SENSE LINE. FAILED TO ACCOMPLISH AIRFRAME VIBRATION CONDITIONAL CHK PER MAINT MANUAL.

Narrative: THE VIBRATION WRITE-UP ON ACFT X STATED THAT FLT ATTENDANT FELT VIBRATION UNDER HER FEET AT ABOUT ROW 20, WHILE INSPECTING INSIDE THE AFT CARGO COMPARTMENT I NOTICED THE AFT BLOWOUT PANEL HAD BEEN DAMAGED. UPON REMOVAL I NOTICED THAT A SENSE LINE HAD BEEN VIBRATING AGAINST THE FLOORBOARD BY THE MARKINGS VISIBLE AGAINST THE FLOORBOARD. THAT LOCATION WAS APPROX WHERE ROW 20 LIES, WHICH MADE IT VERY OBVIOUS THAT WAS THE CAUSE OF THE VIBRATION THE FLT ATTENDANT FELT. I WAS NOT AWARE OF THE AIRFRAME INSPECTION AND ALTHOUGH NOT USED, I FEEL CONFIDENT THAT THE PROB WAS CORRECTED ACCORDINGLY. FOR FUTURE REF I AM NOW AWARE OF THIS INSPECTION AND WILL USE IT. NOTE ALSO IN THE WRITE-UP THE PLT NOTED NO VIBRATION IN FLT DECK.

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.