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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Cpr small transport en route sat-shv at 17000 ft is having problems with VHF communication with center, unreadable. Is picking up ice rapidly and because of communication problems, uses emergency procedure on transponder and descends to 15000 ft. Another aircraft relayed to center the icing problem. Radio being repaired in shv.
| Attributes | |
| ACN | 348239 |
| Time | |
| Date | 199609 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : lfk |
| State Reference | TX |
| Altitude | msl bound lower : 15000 msl bound upper : 17000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zhu |
| Operator | general aviation : corporate |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other other |
| Route In Use | enroute airway : zhu |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 20 flight time total : 7800 flight time type : 200 |
| ASRS Report | 348239 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Events | |
| Anomaly | aircraft equipment problem : less severe inflight encounter : weather |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : exited adverse environment flight crew : declared emergency |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
While en route from sat to shv on V212 at 17000 ft, center reported unable to understand radio transmission from aircraft due to radio static. Center reported unreadable transmission, although flight that morning had no radio problems. Attempts with 2 different mikes on both radios gave no improvement. Ice was encountered. A radio call was made to request a lower altitude. Center could not understand. Ice was building very fast. I squawked 7700 for approximately 2 mins, then changed to 7600, and descended to 15000 ft. Center asked nature of our emergency, but was unable to understand our radio. A second aircraft copied our call and told center it was due to ice. I felt that to remain at 17000 ft in heavy ice was unwise. Hence, the descent and the 7700 and 7600 squawk. Tower at shv reported radio loud and clear, but ground control reported barely readable. Radios are in radio shop for repair.
Original NASA ASRS Text
Title: CPR SMT ENRTE SAT-SHV AT 17000 FT IS HAVING PROBS WITH VHF COM WITH CTR, UNREADABLE. IS PICKING UP ICE RAPIDLY AND BECAUSE OF COM PROBS, USES EMER PROC ON XPONDER AND DSNDS TO 15000 FT. ANOTHER ACFT RELAYED TO CTR THE ICING PROB. RADIO BEING REPAIRED IN SHV.
Narrative: WHILE ENRTE FROM SAT TO SHV ON V212 AT 17000 FT, CTR RPTED UNABLE TO UNDERSTAND RADIO XMISSION FROM ACFT DUE TO RADIO STATIC. CTR RPTED UNREADABLE XMISSION, ALTHOUGH FLT THAT MORNING HAD NO RADIO PROBS. ATTEMPTS WITH 2 DIFFERENT MIKES ON BOTH RADIOS GAVE NO IMPROVEMENT. ICE WAS ENCOUNTERED. A RADIO CALL WAS MADE TO REQUEST A LOWER ALT. CTR COULD NOT UNDERSTAND. ICE WAS BUILDING VERY FAST. I SQUAWKED 7700 FOR APPROX 2 MINS, THEN CHANGED TO 7600, AND DSNDED TO 15000 FT. CTR ASKED NATURE OF OUR EMER, BUT WAS UNABLE TO UNDERSTAND OUR RADIO. A SECOND ACFT COPIED OUR CALL AND TOLD CTR IT WAS DUE TO ICE. I FELT THAT TO REMAIN AT 17000 FT IN HVY ICE WAS UNWISE. HENCE, THE DSCNT AND THE 7700 AND 7600 SQUAWK. TWR AT SHV RPTED RADIO LOUD AND CLR, BUT GND CTL RPTED BARELY READABLE. RADIOS ARE IN RADIO SHOP FOR REPAIR.
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.