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An extremely loud sound precluded internal and external communication. ATC declared an emergency for the flight with clearance to an airport.
| Attributes | |
| ACN | 792988 |
| Time | |
| Date | 200807 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : zzz.vor |
| State Reference | US |
| Altitude | msl single value : 36000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zzz.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | DC-10 30 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : private pilot : instrument pilot : commercial pilot : atp pilot : multi engine |
| Experience | flight time total : 19000 |
| ASRS Report | 792988 |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : landed in emergency condition flight crew : declared emergency flight crew : diverted to another airport |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
Approaching ZZZ VOR; flying at FL360; mach .83 our aircraft experienced an extremely loud sound emanating from the captain's sliding window. While pressurization and all other indications were normal; the sound was so deafening that communication within the cockpit and in particular ATC was most difficult. Suspecting that there was a problem with one of the windows on the aircraft a precautionary series of dscnts was requested to reduce differential pressure and hopefully clear up the problem until landing. Then ATC was appraised of the nature of our problem. After the second request for a lower altitude; ATC said they would treat it as an emergency. They cleared us direct to ZZZ. We requested and were granted a visual approach to runway xx and landed without incident.
Original NASA ASRS Text
Title: AN EXTREMELY LOUD SOUND PRECLUDED INTERNAL AND EXTERNAL COM. ATC DECLARED AN EMER FOR THE FLT WITH CLRNC TO AN ARPT.
Narrative: APCHING ZZZ VOR; FLYING AT FL360; MACH .83 OUR ACFT EXPERIENCED AN EXTREMELY LOUD SOUND EMANATING FROM THE CAPT'S SLIDING WINDOW. WHILE PRESSURIZATION AND ALL OTHER INDICATIONS WERE NORMAL; THE SOUND WAS SO DEAFENING THAT COM WITHIN THE COCKPIT AND IN PARTICULAR ATC WAS MOST DIFFICULT. SUSPECTING THAT THERE WAS A PROB WITH ONE OF THE WINDOWS ON THE ACFT A PRECAUTIONARY SERIES OF DSCNTS WAS REQUESTED TO REDUCE DIFFERENTIAL PRESSURE AND HOPEFULLY CLR UP THE PROB UNTIL LNDG. THEN ATC WAS APPRAISED OF THE NATURE OF OUR PROB. AFTER THE SECOND REQUEST FOR A LOWER ALT; ATC SAID THEY WOULD TREAT IT AS AN EMER. THEY CLRED US DIRECT TO ZZZ. WE REQUESTED AND WERE GRANTED A VISUAL APCH TO RWY XX AND LANDED WITHOUT INCIDENT.
Data retrieved from NASA's ASRS site as of May 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.