 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
A B757-200 in cruise at FL340 cabin attendant reported a thumping sound under cabin floor. In 1-2 mins sound dissipated. On ground found ground pneumatic service door missing.
| Attributes | |
| ACN | 695566 |
| Time | |
| Date | 200605 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | intersection : lajug |
| State Reference | TN |
| Altitude | msl single value : 34000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 695566 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| ASRS Report | 695567 |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : published procedure non adherence : far |
| Independent Detector | other other : 3 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other other |
| Factors | |
| Maintenance | performance deficiency : non compliance with legal requirements |
| Supplementary | |
| Problem Areas | Environmental Factor Chart Or Publication Aircraft Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
En route at cruise altitude we entered light turbulence. Shortly thereafter; a flight attendant reported a thumping sound beneath the cabin floor. She described it as random; and it quit after 1-2 mins. The sound did not recur. After landing; during her walkaround; my first officer discovered the left pneumatic ground service connector door was missing. Also; there was physical damage to the area immediately aft of the missing door. I informed my dispatcher of the possibility of a dropped object in-flight over tennessee (based upon the timing of the reported thumping).
Original NASA ASRS Text
Title: A B757-200 IN CRUISE AT FL340 CABIN ATTENDANT RPTED A THUMPING SOUND UNDER CABIN FLOOR. IN 1-2 MINS SOUND DISSIPATED. ON GND FOUND GND PNEUMATIC SVC DOOR MISSING.
Narrative: ENRTE AT CRUISE ALT WE ENTERED LIGHT TURB. SHORTLY THEREAFTER; A FLT ATTENDANT RPTED A THUMPING SOUND BENEATH THE CABIN FLOOR. SHE DESCRIBED IT AS RANDOM; AND IT QUIT AFTER 1-2 MINS. THE SOUND DID NOT RECUR. AFTER LNDG; DURING HER WALKAROUND; MY FO DISCOVERED THE L PNEUMATIC GND SVC CONNECTOR DOOR WAS MISSING. ALSO; THERE WAS PHYSICAL DAMAGE TO THE AREA IMMEDIATELY AFT OF THE MISSING DOOR. I INFORMED MY DISPATCHER OF THE POSSIBILITY OF A DROPPED OBJECT INFLT OVER TENNESSEE (BASED UPON THE TIMING OF THE RPTED THUMPING).
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.