| At approximately 1000 feet asl and five miles from the threshold, the flight crew had the approach lights and the PAPI in sight. |
| The FAA issued an advisory notice to airport operators after the accident to keep PAPI units running to prevent contamination. |
| Since the PAPI was located about 500 feet west of the threshold, the co-pilot saw the runway threshold at a distance of? |
| When the captain saw that the PAPI was indicating that the altitude was too low, he initiated a missed approach. |
| It was not evident whether the PAPI was positioned on the right or the left side of the runway. |
| During the turn onto final leg, the first officer observed the PAPI and advised the captain that the aircraft was too low. |
