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An md super 80 on arrival tracks at FL310 experienced erratic ADF indications from both system. Cabin check revealed 2 laptop computers, 4 clearance delivery players, 4 cassette players, and 1 personal video computer in operation.
| Attributes | |
| ACN | 403798 |
| Time | |
| Date | 199805 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : diw |
| State Reference | NC |
| Altitude | msl bound lower : 31000 msl bound upper : 31000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc tower : stl |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Super 80 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors enroute : other oceanic enroute airway : zdc |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 403798 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | other flight crewa other other : unspecified |
| Resolutory Action | other |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
Trying to navigation south of dixon on the arrival tracks unable to maintain course. Both ADF needles at times either did not move or were 40-50 degrees in error. ATC gave us vectors to intercept the arrival for fll. An inspection of the cabin revealed 2 laptop computers, 4 clearance delivery players, 4 cassette players, and 1 personal video computer in operation. We still wrote up the ADF and it was placarded after our diversion into mia. Callback conversation with reporter revealed the following information: the reporter stated there was no doubt that the combination of cabin electronic devices and number of devices caused ADF interference and erratic operation. The reporter said the center advised the flight was on course but the ADF system were commanding a left or right 40 degree turn. The reporter said the center gave the flight vectors to fll. The reporter stated the passenger were not requested to turn off the devices because they would only sneak turning on the devices again.
Original NASA ASRS Text
Title: AN MD SUPER 80 ON ARR TRACKS AT FL310 EXPERIENCED ERRATIC ADF INDICATIONS FROM BOTH SYS. CABIN CHK REVEALED 2 LAPTOP COMPUTERS, 4 CD PLAYERS, 4 CASSETTE PLAYERS, AND 1 PERSONAL VIDEO COMPUTER IN OP.
Narrative: TRYING TO NAV S OF DIXON ON THE ARR TRACKS UNABLE TO MAINTAIN COURSE. BOTH ADF NEEDLES AT TIMES EITHER DID NOT MOVE OR WERE 40-50 DEGS IN ERROR. ATC GAVE US VECTORS TO INTERCEPT THE ARR FOR FLL. AN INSPECTION OF THE CABIN REVEALED 2 LAPTOP COMPUTERS, 4 CD PLAYERS, 4 CASSETTE PLAYERS, AND 1 PERSONAL VIDEO COMPUTER IN OP. WE STILL WROTE UP THE ADF AND IT WAS PLACARDED AFTER OUR DIVERSION INTO MIA. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THERE WAS NO DOUBT THAT THE COMBINATION OF CABIN ELECTRONIC DEVICES AND NUMBER OF DEVICES CAUSED ADF INTERFERENCE AND ERRATIC OP. THE RPTR SAID THE CTR ADVISED THE FLT WAS ON COURSE BUT THE ADF SYS WERE COMMANDING A L OR R 40 DEG TURN. THE RPTR SAID THE CTR GAVE THE FLT VECTORS TO FLL. THE RPTR STATED THE PAX WERE NOT REQUESTED TO TURN OFF THE DEVICES BECAUSE THEY WOULD ONLY SNEAK TURNING ON THE DEVICES AGAIN.
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.