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The NDB runway 15 approach to ism is flown using an incorrectly programmed GPS as a reference resulting in descent from assigned altitude without awareness of exact location.
| Attributes | |
| ACN | 590678 |
| Time | |
| Date | 200308 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : ism.airport |
| State Reference | FL |
| Altitude | msl bound lower : 1200 msl bound upper : 2000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : mco.tracon |
| Operator | general aviation : personal |
| Make Model Name | Skynight 320 |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other other ndb |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument non precision |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument pilot : multi engine pilot : cfi pilot : commercial |
| Experience | flight time last 90 days : 21 flight time total : 1489 flight time type : 632 |
| ASRS Report | 590678 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : far non adherence : published procedure non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
I was cleared for the NDB runway 15 into ism and told to maintain 2000 ft until established. I had the approach loaded into my GPS to monitor the approach. The GPS was showing me 1 mi from vinel, so I began a descent. Upon reaching 1200 ft, I realized that instead of 'distance,' the GPS was showing ete, so I was not actually 1 mi outside of vinel as I had thought. I changed the GPS to show distance and continued and made a normal landing. I was within 10 mi of ism, so no minimums were broken. I was also in VMC and could see the ground. During my en route phase of flight, I had set the flight plan in the GPS to show ete and forgot to change it back to 'distance' before starting the approach.
Original NASA ASRS Text
Title: THE NDB RWY 15 APCH TO ISM IS FLOWN USING AN INCORRECTLY PROGRAMMED GPS AS A REF RESULTING IN DSCNT FROM ASSIGNED ALT WITHOUT AWARENESS OF EXACT LOCATION.
Narrative: I WAS CLRED FOR THE NDB RWY 15 INTO ISM AND TOLD TO MAINTAIN 2000 FT UNTIL ESTABLISHED. I HAD THE APCH LOADED INTO MY GPS TO MONITOR THE APCH. THE GPS WAS SHOWING ME 1 MI FROM VINEL, SO I BEGAN A DSCNT. UPON REACHING 1200 FT, I REALIZED THAT INSTEAD OF 'DISTANCE,' THE GPS WAS SHOWING ETE, SO I WAS NOT ACTUALLY 1 MI OUTSIDE OF VINEL AS I HAD THOUGHT. I CHANGED THE GPS TO SHOW DISTANCE AND CONTINUED AND MADE A NORMAL LNDG. I WAS WITHIN 10 MI OF ISM, SO NO MINIMUMS WERE BROKEN. I WAS ALSO IN VMC AND COULD SEE THE GND. DURING MY ENRTE PHASE OF FLT, I HAD SET THE FLT PLAN IN THE GPS TO SHOW ETE AND FORGOT TO CHANGE IT BACK TO 'DISTANCE' BEFORE STARTING THE APCH.
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.