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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Flight crew reports EMI interference being present by static in headsets and radio altitude flag displayed.
| Attributes | |
| ACN | 269992 |
| Time | |
| Date | 199404 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : chs |
| State Reference | SC |
| Altitude | msl bound lower : 10000 msl bound upper : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zjx |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : flight engineer pilot : atp pilot : instrument |
| Experience | flight time last 90 days : 150 flight time total : 6600 flight time type : 500 |
| ASRS Report | 269992 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence other other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : overcame equipment problem other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
During climb out on flight from jax to phl, the first officer had an off flag in his radar altimeter. After level off, both pilots started to get some static in their headsets. I, as the first officer, asked the a flight attendant to check for use of personal computers and clearance delivery's. At this time, we had two personal computer in use and possibly two clearance delivery players. The makes and location of the computers and clearance delivery players are as follows: seat 8C - clearance delivery, seat 8F - clearance delivery, seat 1A - pc, seat 5C - pc. We asked the a flight attendant to ask the people with the clearance delivery players to turn them off. After they turned them off, the flag went out but continued to come on intermittently. We thought the lap top computers may be causing it to be intermittent if turned on and off. We had both turned on and off with no flag. Both were left on with no flag appearing. It appears that the flag came on due strictly from the use of clearance delivery players. These clearance delivery players were both on when the flight attendant initially checked, and we assumed it came on intermittently because one of the passenger turned it back on after she ask them to turn them off. With both pcs on, we had the passenger turn on their clearance delivery's one at a time, seat 8F then 8C. This time no flag. We had 8F turn his off. Still no flag. I feel that the flag was attributed to the clearance delivery's since it went out when turned off.
Original NASA ASRS Text
Title: FLC RPTS EMI INTERFERENCE BEING PRESENT BY STATIC IN HEADSETS AND RADIO ALT FLAG DISPLAYED.
Narrative: DURING CLBOUT ON FLT FROM JAX TO PHL, THE FO HAD AN OFF FLAG IN HIS RADAR ALTIMETER. AFTER LEVEL OFF, BOTH PLTS STARTED TO GET SOME STATIC IN THEIR HEADSETS. I, AS THE FO, ASKED THE A FA TO CHK FOR USE OF PERSONAL COMPUTERS AND CD'S. AT THIS TIME, WE HAD TWO PERSONAL COMPUTER IN USE AND POSSIBLY TWO CD PLAYERS. THE MAKES AND LOCATION OF THE COMPUTERS AND CD PLAYERS ARE AS FOLLOWS: SEAT 8C - CD, SEAT 8F - CD, SEAT 1A - PC, SEAT 5C - PC. WE ASKED THE A FA TO ASK THE PEOPLE WITH THE CD PLAYERS TO TURN THEM OFF. AFTER THEY TURNED THEM OFF, THE FLAG WENT OUT BUT CONTINUED TO COME ON INTERMITTENTLY. WE THOUGHT THE LAP TOP COMPUTERS MAY BE CAUSING IT TO BE INTERMITTENT IF TURNED ON AND OFF. WE HAD BOTH TURNED ON AND OFF WITH NO FLAG. BOTH WERE LEFT ON WITH NO FLAG APPEARING. IT APPEARS THAT THE FLAG CAME ON DUE STRICTLY FROM THE USE OF CD PLAYERS. THESE CD PLAYERS WERE BOTH ON WHEN THE FA INITIALLY CHKED, AND WE ASSUMED IT CAME ON INTERMITTENTLY BECAUSE ONE OF THE PAX TURNED IT BACK ON AFTER SHE ASK THEM TO TURN THEM OFF. WITH BOTH PCS ON, WE HAD THE PAX TURN ON THEIR CD'S ONE AT A TIME, SEAT 8F THEN 8C. THIS TIME NO FLAG. WE HAD 8F TURN HIS OFF. STILL NO FLAG. I FEEL THAT THE FLAG WAS ATTRIBUTED TO THE CD'S SINCE IT WENT OUT WHEN TURNED OFF.
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.