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Coupled approach, all autoplts engaged, all locs centered. Disconnected at 100 ft because aircraft would have landed to the left of runway. Interference from cellular phone or computer on board the aircraft is suspected by reporter.
| Attributes | |
| ACN | 321746 |
| Time | |
| Date | 199511 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : pit |
| State Reference | PA |
| Altitude | agl bound lower : 100 agl bound upper : 1000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Dawn |
| Aircraft 1 | |
| Controlling Facilities | tower : pit |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 15000 flight time type : 1600 |
| ASRS Report | 321746 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
While doing a coupled autoplt approach with 3 autoplts engaged, both pilots noticed at 1 1/2 mi from airport that we were lined up left. Checked all 3 navigation locs for deviations and all were centered. At 100 ft AGL, I disconnected autoplts because we would have landed to the left of the runway. All 3 locs were centered, no flags, and land 3 on asa was displayed. Wrote up problem in logbook and ILS system checked good -- no further write-ups. I was told this may be a classic situation of interference from a cellular telephone or computer. Had this been a CAT III with 50 ft alert ht in 300 or 600 ft RVR, we would be dead. Call if you like, and good luck. Recommendations: when I brief my flight attendants I make sure that they really check for telephone use and computer use below 10000 ft, but passenger will still do what they want.
Original NASA ASRS Text
Title: COUPLED APCH, ALL AUTOPLTS ENGAGED, ALL LOCS CTRED. DISCONNECTED AT 100 FT BECAUSE ACFT WOULD HAVE LANDED TO THE L OF RWY. INTERFERENCE FROM CELLULAR PHONE OR COMPUTER ON BOARD THE ACFT IS SUSPECTED BY RPTR.
Narrative: WHILE DOING A COUPLED AUTOPLT APCH WITH 3 AUTOPLTS ENGAGED, BOTH PLTS NOTICED AT 1 1/2 MI FROM ARPT THAT WE WERE LINED UP L. CHKED ALL 3 NAV LOCS FOR DEVS AND ALL WERE CTRED. AT 100 FT AGL, I DISCONNECTED AUTOPLTS BECAUSE WE WOULD HAVE LANDED TO THE L OF THE RWY. ALL 3 LOCS WERE CTRED, NO FLAGS, AND LAND 3 ON ASA WAS DISPLAYED. WROTE UP PROB IN LOGBOOK AND ILS SYS CHKED GOOD -- NO FURTHER WRITE-UPS. I WAS TOLD THIS MAY BE A CLASSIC SIT OF INTERFERENCE FROM A CELLULAR TELEPHONE OR COMPUTER. HAD THIS BEEN A CAT III WITH 50 FT ALERT HT IN 300 OR 600 FT RVR, WE WOULD BE DEAD. CALL IF YOU LIKE, AND GOOD LUCK. RECOMMENDATIONS: WHEN I BRIEF MY FLT ATTENDANTS I MAKE SURE THAT THEY REALLY CHK FOR TELEPHONE USE AND COMPUTER USE BELOW 10000 FT, BUT PAX WILL STILL DO WHAT THEY WANT.
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.