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Flight crew of air carrier large transport lost communications with center for 20 min during high altitude cruise.
| Attributes | |
| ACN | 274428 |
| Time | |
| Date | 199406 |
| Day | Thu |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | atc facility : 1vh |
| State Reference | IN |
| Altitude | msl bound lower : 33000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 75 flight time total : 18800 flight time type : 550 |
| ASRS Report | 274428 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
While in cruise in an area of thunderstorms we were keeping a careful radar watch of the various buildups. A call to center to request a higher altitude brought a strong reaction from the controller 'where have you been for the last 20 min?' what a question! Neither of us had left our seats during the previous 20 min. No flight attendants had visited the cockpit during this time. We had not adjusted the volume controls...in short we both were at a total loss to explain the lack of or loss of communications.
Original NASA ASRS Text
Title: FLC OF ACR LGT LOST COMS WITH CTR FOR 20 MIN DURING HIGH ALT CRUISE.
Narrative: WHILE IN CRUISE IN AN AREA OF TSTMS WE WERE KEEPING A CAREFUL RADAR WATCH OF THE VARIOUS BUILDUPS. A CALL TO CTR TO REQUEST A HIGHER ALT BROUGHT A STRONG REACTION FROM THE CTLR 'WHERE HAVE YOU BEEN FOR THE LAST 20 MIN?' WHAT A QUESTION! NEITHER OF US HAD LEFT OUR SEATS DURING THE PREVIOUS 20 MIN. NO FLT ATTENDANTS HAD VISITED THE COCKPIT DURING THIS TIME. WE HAD NOT ADJUSTED THE VOLUME CTLS...IN SHORT WE BOTH WERE AT A TOTAL LOSS TO EXPLAIN THE LACK OF OR LOSS OF COMS.
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.