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Air carrier medium large transport overshot localizer track when cleared for approach due to the first officer's course indicator froze.
| Attributes | |
| ACN | 268406 |
| Time | |
| Date | 199404 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : dtw |
| State Reference | MI |
| Altitude | msl bound lower : 3000 msl bound upper : 3000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : dtw |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 14300 flight time type : 8100 |
| ASRS Report | 268406 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : clearance other anomaly other other spatial deviation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Detroit metropolitan was conducting simultaneous approachs to runways 3L and 3R. We were on a 320 degree radar vector for the 3R ILS intercept. I (the PNF) had my navigation tuned to the crl VOR and the first officer had this navigation tuned to the 3R ILS. As I was changing my navigation over to the 3R ILS, detroit approach control instructed us to make an immediate right turn to reintercept the 3R ILS. Apparently the first officer's CDI momentarily froze and he flew through the localizer. Using my captain's navigation, we reintercepted the 3R ILS. There were no traffic conflicts that we knew of. I wrote up the first officer's navigation in the aircraft maintenance log.
Original NASA ASRS Text
Title: ACR MLG OVERSHOT LOC TRACK WHEN CLRED FOR APCH DUE TO THE FO'S COURSE INDICATOR FROZE.
Narrative: DETROIT METRO WAS CONDUCTING SIMULTANEOUS APCHS TO RWYS 3L AND 3R. WE WERE ON A 320 DEG RADAR VECTOR FOR THE 3R ILS INTERCEPT. I (THE PNF) HAD MY NAV TUNED TO THE CRL VOR AND THE FO HAD THIS NAV TUNED TO THE 3R ILS. AS I WAS CHANGING MY NAV OVER TO THE 3R ILS, DETROIT APCH CTL INSTRUCTED US TO MAKE AN IMMEDIATE RIGHT TURN TO REINTERCEPT THE 3R ILS. APPARENTLY THE FO'S CDI MOMENTARILY FROZE AND HE FLEW THROUGH THE LOC. USING MY CAPT'S NAV, WE REINTERCEPTED THE 3R ILS. THERE WERE NO TFC CONFLICTS THAT WE KNEW OF. I WROTE UP THE FO'S NAV IN THE ACFT MAINT LOG.
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.