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An exterior cabin window separated on descent, and reporter elected to continue descent beyond assigned altitude without ATC clearance being unable to communication due to frequency saturation.
| Attributes | |
| ACN | 277359 |
| Time | |
| Date | 199407 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : ptv |
| State Reference | CA |
| Altitude | msl bound lower : 10000 msl bound upper : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other descent other |
| Route In Use | enroute airway : zoa |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 270 flight time total : 5000 flight time type : 500 |
| ASRS Report | 277359 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Aircraft was on initial descent for the fresno airport. Aircraft leveled at 12000 ft, the assigned altitude. An exterior cabin window separated in flight and a precautionary descent was initiated to reduce cabin differential pressure. ZOA frequency was congested and no descent clearance could be obtained until approximately 10000 ft MSL. Aircraft was then cleared to 3000 ft MSL and switched to fresno approach. Aircraft landed uneventfully.
Original NASA ASRS Text
Title: AN EXTERIOR CABIN WINDOW SEPARATED ON DSCNT, AND RPTR ELECTED TO CONTINUE DSCNT BEYOND ASSIGNED ALT WITHOUT ATC CLRNC BEING UNABLE TO COM DUE TO FREQ SATURATION.
Narrative: ACFT WAS ON INITIAL DSCNT FOR THE FRESNO ARPT. ACFT LEVELED AT 12000 FT, THE ASSIGNED ALT. AN EXTERIOR CABIN WINDOW SEPARATED IN FLT AND A PRECAUTIONARY DSCNT WAS INITIATED TO REDUCE CABIN DIFFERENTIAL PRESSURE. ZOA FREQ WAS CONGESTED AND NO DSCNT CLRNC COULD BE OBTAINED UNTIL APPROX 10000 FT MSL. ACFT WAS THEN CLRED TO 3000 FT MSL AND SWITCHED TO FRESNO APCH. ACFT LANDED UNEVENTFULLY.
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.