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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Air carrier first officer report on commercial radio. ATC radio communication problem unable to establish radio contact with flight crew in a DC10-30 during an overwater operation.
| Attributes | |
| ACN | 344700 |
| Time | |
| Date | 199608 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zoa |
| State Reference | CA |
| Altitude | msl bound lower : 33000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa |
| Operator | common carrier : air carrier |
| Make Model Name | DC-10 30 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Route In Use | enroute : other oceanic enroute : pacific enroute airway : r576 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 5000 flight time type : 200 |
| ASRS Report | 344700 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | other controllera other other : unspecified |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
We were contacted by hnl commercial radio. Via SELCAL inquiring why we did not respond to their calls. They added that numerous aircraft along our route of flight had attempted to call us. ZHN passed that, due to our bad derok estimate and our failure to respond, 2 other aircraft had to be maneuvered. We were surprised because, in our opinion, we answered each SELCAL, we continuously monitored 121.50, and monitored 128.95 frequently (that frequency turned down several times when making reports due to excessive chatter). We were also within 3 mins of our derok estimate (XA38Z). I think there is a perception among trans-oceanic crews that 128.95 is the required VHF frequency to monitor. 128.95 is 'available,' 121.50 is required. Nobody called us on 121.50. I can't explain why we did not get a SELCAL, or why ATC thought our derok estimate was 'bad.'
Original NASA ASRS Text
Title: ACR FO RPT ON COMMERCIAL RADIO. ATC RADIO COM PROB UNABLE TO ESTABLISH RADIO CONTACT WITH FLC IN A DC10-30 DURING AN OVERWATER OP.
Narrative: WE WERE CONTACTED BY HNL COMMERCIAL RADIO. VIA SELCAL INQUIRING WHY WE DID NOT RESPOND TO THEIR CALLS. THEY ADDED THAT NUMEROUS ACFT ALONG OUR RTE OF FLT HAD ATTEMPTED TO CALL US. ZHN PASSED THAT, DUE TO OUR BAD DEROK ESTIMATE AND OUR FAILURE TO RESPOND, 2 OTHER ACFT HAD TO BE MANEUVERED. WE WERE SURPRISED BECAUSE, IN OUR OPINION, WE ANSWERED EACH SELCAL, WE CONTINUOUSLY MONITORED 121.50, AND MONITORED 128.95 FREQUENTLY (THAT FREQ TURNED DOWN SEVERAL TIMES WHEN MAKING RPTS DUE TO EXCESSIVE CHATTER). WE WERE ALSO WITHIN 3 MINS OF OUR DEROK ESTIMATE (XA38Z). I THINK THERE IS A PERCEPTION AMONG TRANS-OCEANIC CREWS THAT 128.95 IS THE REQUIRED VHF FREQ TO MONITOR. 128.95 IS 'AVAILABLE,' 121.50 IS REQUIRED. NOBODY CALLED US ON 121.50. I CAN'T EXPLAIN WHY WE DID NOT GET A SELCAL, OR WHY ATC THOUGHT OUR DEROK ESTIMATE WAS 'BAD.'
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.