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Cpr light transport made go around from OM at the start of IAP ILS approach because the flight crew could not resolve a discrepancy in navigational instrument indication and aircraft position.
| Attributes | |
| ACN | 81681 |
| Time | |
| Date | 198802 |
| Day | Wed |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : gsp |
| State Reference | SC |
| Altitude | msl bound lower : 1600 msl bound upper : 1600 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl |
| Operator | general aviation : corporate |
| Make Model Name | Light Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent : approach landing : go around other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 14000 flight time type : 10 |
| ASRS Report | 81681 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 75 flight time total : 9700 flight time type : 10 |
| ASRS Report | 81680 |
| Events | |
| Anomaly | non adherence : published procedure other spatial deviation |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : became reoriented other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Departure delayed because of low ceilings and visibility at gsp. After there was an improving trend, we departed mob. Crew was tired because of long duty day. Upon arrival at gsp we were directed to hold as another aircraft was on approach. After 1 turn in the pattern we were clrd for an ILS 3 approach, G/south and localizer information appeared normal. However, after passing the outer compass locator, the localizer appeared to lose its sensitivity. A missed approach was executed to evaluate the problem. The first officer noted that the navigation/LORAN switch was inadvertently left in LORAN. Another approach was accomplished west/O further incident. Corrective actions: on previous aircraft LORAN would disengage when an ILS frequency was selected. Our aircraft is being changed so that it will do the same thing. Navigation/LORAN check to be added to checklist. It would help if approach control remained open at night to alert crew of localizer deviation. Add xchk of instruments to checklist.
Original NASA ASRS Text
Title: CPR LTT MADE GO AROUND FROM OM AT THE START OF IAP ILS APCH BECAUSE THE FLT CREW COULD NOT RESOLVE A DISCREPANCY IN NAVIGATIONAL INSTRUMENT INDICATION AND ACFT POSITION.
Narrative: DEP DELAYED BECAUSE OF LOW CEILINGS AND VIS AT GSP. AFTER THERE WAS AN IMPROVING TREND, WE DEPARTED MOB. CREW WAS TIRED BECAUSE OF LONG DUTY DAY. UPON ARR AT GSP WE WERE DIRECTED TO HOLD AS ANOTHER ACFT WAS ON APCH. AFTER 1 TURN IN THE PATTERN WE WERE CLRD FOR AN ILS 3 APCH, G/S AND LOC INFO APPEARED NORMAL. HOWEVER, AFTER PASSING THE OUTER COMPASS LOCATOR, THE LOC APPEARED TO LOSE ITS SENSITIVITY. A MISSED APCH WAS EXECUTED TO EVALUATE THE PROB. THE F/O NOTED THAT THE NAV/LORAN SWITCH WAS INADVERTENTLY LEFT IN LORAN. ANOTHER APCH WAS ACCOMPLISHED W/O FURTHER INCIDENT. CORRECTIVE ACTIONS: ON PREVIOUS ACFT LORAN WOULD DISENGAGE WHEN AN ILS FREQ WAS SELECTED. OUR ACFT IS BEING CHANGED SO THAT IT WILL DO THE SAME THING. NAV/LORAN CHK TO BE ADDED TO CHKLIST. IT WOULD HELP IF APCH CTL REMAINED OPEN AT NIGHT TO ALERT CREW OF LOC DEV. ADD XCHK OF INSTRUMENTS TO CHKLIST.
Data retrieved from NASA's ASRS site as of August 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.