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Reporter descended through clouds knowing the bases were 1000 ft (AGL) and the visibility 3 mi using a localizer he did not trust and was in fact erroneous.
| Attributes | |
| ACN | 278370 |
| Time | |
| Date | 199407 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : mht |
| State Reference | NH |
| Altitude | agl bound lower : 1000 agl bound upper : 1000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : mht artcc : zfw |
| Operator | common carrier : air taxi |
| Make Model Name | Small Transport, Low Wing, 2 Recip Eng |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : single pilot |
| Qualification | pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 75 flight time total : 2100 flight time type : 600 |
| ASRS Report | 278370 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : clearance other spatial deviation |
| Independent Detector | other other : unspecified cockpit |
| Resolutory Action | aircraft : equipment problem dissipated flight crew : became reoriented |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
Approaching mht airport on ILS runway 35 approach control vectored me on to localizer. I noticed that the localizer needle was not ctring showing right of course. GS indicator appeared inoperative (flag). Identify confirmed proper frequency. Decided to use no GS minimums. WX was 3 mi 1000 ft sky obscured fog and haze. Realized by 2 mi from field was receiving erroneous information from ILS. Looked up, saw airport at my 1-2 O'clock position. At that time tower asked my intentions. Told them I had field in sight and was landing. Had something wrong with navigation radio. Prior to landing switched through frequencys and reset proper frequency navigation worked properly (localizer and GS). I believe with the age of the equipment installed, that there must have been something keeping the navigation from working properly. When I dialed through the channels and reset the frequency, I must have cleaned out or made a better connection for that frequency. I do not believe there was any danger, because WX was VFR, although marginal, I used GS out minimums, and in a controled environment.
Original NASA ASRS Text
Title: RPTR DSNDED THROUGH CLOUDS KNOWING THE BASES WERE 1000 FT (AGL) AND THE VISIBILITY 3 MI USING A LOC HE DID NOT TRUST AND WAS IN FACT ERRONEOUS.
Narrative: APCHING MHT ARPT ON ILS RWY 35 APCH CTL VECTORED ME ON TO LOC. I NOTICED THAT THE LOC NEEDLE WAS NOT CTRING SHOWING R OF COURSE. GS INDICATOR APPEARED INOP (FLAG). IDENT CONFIRMED PROPER FREQ. DECIDED TO USE NO GS MINIMUMS. WX WAS 3 MI 1000 FT SKY OBSCURED FOG AND HAZE. REALIZED BY 2 MI FROM FIELD WAS RECEIVING ERRONEOUS INFO FROM ILS. LOOKED UP, SAW ARPT AT MY 1-2 O'CLOCK POS. AT THAT TIME TWR ASKED MY INTENTIONS. TOLD THEM I HAD FIELD IN SIGHT AND WAS LNDG. HAD SOMETHING WRONG WITH NAV RADIO. PRIOR TO LNDG SWITCHED THROUGH FREQS AND RESET PROPER FREQ NAV WORKED PROPERLY (LOC AND GS). I BELIEVE WITH THE AGE OF THE EQUIP INSTALLED, THAT THERE MUST HAVE BEEN SOMETHING KEEPING THE NAV FROM WORKING PROPERLY. WHEN I DIALED THROUGH THE CHANNELS AND RESET THE FREQ, I MUST HAVE CLEANED OUT OR MADE A BETTER CONNECTION FOR THAT FREQ. I DO NOT BELIEVE THERE WAS ANY DANGER, BECAUSE WX WAS VFR, ALTHOUGH MARGINAL, I USED GS OUT MINIMUMS, AND IN A CTLED ENVIRONMENT.
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.