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A B727 freighter. After takeoff the aircraft experienced a moderate shuddering and loud reverberating noise caused by a ruptured air distribution duct. Aircraft returned to the field.
| Attributes | |
| ACN | 421478 |
| Time | |
| Date | 199811 |
| Day | Thu |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : oak |
| State Reference | CA |
| Altitude | agl bound lower : 0 agl bound upper : 2500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | other other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 100 flight time total : 450 flight time type : 140 |
| ASRS Report | 421478 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : declared emergency none taken : detected after the fact other |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
On nov/xa/98 log page xyz taking off from oak to den, our crew had to make a return to oak airport. Shortly after liftoff, we experienced a moderate shuddering and a loud reverberating noise emanating down the whole left side of the aircraft. After leveling off at approximately 2500 ft AGL and notifying ATC, I was sent back by the captain to check the cargo and L1 door. They both checked out ok and I didn't hear or feel anything out of the ordinary from around either. I then returned to my station, completed the landing data and we returned to land. After landing and returning to the ground facility, the first officer got up from his station and went and opened the L1 door while I was communicating to operations on the VHF. He said he thought the escape rope was possibly caught in the L1 door because it was frayed near the connection (where the rope connects to the ceiling). I disagree with this now and then, but that was the only idea of what could be causing the noise, which we later found to be a blown duct making the noise.
Original NASA ASRS Text
Title: A B727 FREIGHTER. AFTER TKOF THE ACFT EXPERIENCED A MODERATE SHUDDERING AND LOUD REVERBERATING NOISE CAUSED BY A RUPTURED AIR DISTRIBUTION DUCT. ACFT RETURNED TO THE FIELD.
Narrative: ON NOV/XA/98 LOG PAGE XYZ TAKING OFF FROM OAK TO DEN, OUR CREW HAD TO MAKE A RETURN TO OAK ARPT. SHORTLY AFTER LIFTOFF, WE EXPERIENCED A MODERATE SHUDDERING AND A LOUD REVERBERATING NOISE EMANATING DOWN THE WHOLE L SIDE OF THE ACFT. AFTER LEVELING OFF AT APPROX 2500 FT AGL AND NOTIFYING ATC, I WAS SENT BACK BY THE CAPT TO CHK THE CARGO AND L1 DOOR. THEY BOTH CHKED OUT OK AND I DIDN'T HEAR OR FEEL ANYTHING OUT OF THE ORDINARY FROM AROUND EITHER. I THEN RETURNED TO MY STATION, COMPLETED THE LNDG DATA AND WE RETURNED TO LAND. AFTER LNDG AND RETURNING TO THE GND FACILITY, THE FO GOT UP FROM HIS STATION AND WENT AND OPENED THE L1 DOOR WHILE I WAS COMMUNICATING TO OPS ON THE VHF. HE SAID HE THOUGHT THE ESCAPE ROPE WAS POSSIBLY CAUGHT IN THE L1 DOOR BECAUSE IT WAS FRAYED NEAR THE CONNECTION (WHERE THE ROPE CONNECTS TO THE CEILING). I DISAGREE WITH THIS NOW AND THEN, BUT THAT WAS THE ONLY IDEA OF WHAT COULD BE CAUSING THE NOISE, WHICH WE LATER FOUND TO BE A BLOWN DUCT MAKING THE NOISE.
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.