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A B737-300LR PIC's report on possible RF interference and the aircraft's attempt of a turn while trying to follow a displaced CDI while in contact with ZID, in.
| Attributes | |
| ACN | 463514 |
| Time | |
| Date | 200002 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : rod.vortac |
| State Reference | OH |
| Altitude | msl single value : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other other vortac |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 18500 flight time type : 600 |
| ASRS Report | 463514 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : less severe inflight encounter other other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : cdi other flight crewa other flight crewb |
| Resolutory Action | other |
| Supplementary | |
| Problem Areas | Passenger Human Performance Aircraft |
| Primary Problem | Aircraft |
Narrative:
Crossing rod, CDI (course deviation indicator) rotated to 90 degrees (standby) position and showed inoperative flags. No annunciation on FMC or overhead of any problem. FMC appeared to be trying to navigation to a fix behind us. Switched to VOR navigation. Flight attendant reported passenger watching broadcast tv on portable unit. Tv turned off. Navigation problems coincided with operations time of tv. Returned to LNAV without further problems.
Original NASA ASRS Text
Title: A B737-300LR PIC'S RPT ON POSSIBLE RF INTERFERENCE AND THE ACFT'S ATTEMPT OF A TURN WHILE TRYING TO FOLLOW A DISPLACED CDI WHILE IN CONTACT WITH ZID, IN.
Narrative: XING ROD, CDI (COURSE DEV INDICATOR) ROTATED TO 90 DEGS (STANDBY) POS AND SHOWED INOP FLAGS. NO ANNUNCIATION ON FMC OR OVERHEAD OF ANY PROB. FMC APPEARED TO BE TRYING TO NAV TO A FIX BEHIND US. SWITCHED TO VOR NAV. FLT ATTENDANT RPTED PAX WATCHING BROADCAST TV ON PORTABLE UNIT. TV TURNED OFF. NAV PROBS COINCIDED WITH OPS TIME OF TV. RETURNED TO LNAV WITHOUT FURTHER PROBS.
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.