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Flight crew of a beech 2, model 1900 airliner, descended below authority/authorized minimums during an ILS approach due to misinterp of a NOTAM limiting the approach to a higher altitude. A successful landing was made after breaking out at approximately 100 ft above the runway.
| Attributes | |
| ACN | 384360 |
| Time | |
| Date | 199710 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : pdx |
| State Reference | OR |
| Altitude | agl bound lower : 126 agl bound upper : 226 |
| Environment | |
| Flight Conditions | IMC |
| Light | Dawn |
| Aircraft 1 | |
| Controlling Facilities | tower : pdx tracon : mex |
| Operator | common carrier : air carrier |
| Make Model Name | Beech 1900 |
| Operating Under FAR Part | Part 135 |
| Navigation In Use | Other |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | other other : other pilot : commercial pilot : instrument |
| Experience | flight time last 90 days : 300 flight time total : 1600 flight time type : 1100 |
| ASRS Report | 384360 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : commercial |
| Events | |
| Anomaly | non adherence : clearance non adherence : published procedure other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Weather |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Deviated from MDA (480 ft) while on approach to pdx on ILS runway 10L ivdg to full ILS decision ht 226 ft (and to 126 ft after sighting the ALS on runway 10L). I believe this was due to the poor wording of the fdc NOTAM stating 'ILS runway 10L minimums not applicable MDA 480 ft.' captain and I thought the MDA applied only to the straight-in runway 10L localizer, and therefore, carried on with the full ILS runway 10L approach to minimums, followed by uneventful landing.
Original NASA ASRS Text
Title: FLC OF A BEECH 2, MODEL 1900 AIRLINER, DSNDED BELOW AUTH MINIMUMS DURING AN ILS APCH DUE TO MISINTERP OF A NOTAM LIMITING THE APCH TO A HIGHER ALT. A SUCCESSFUL LNDG WAS MADE AFTER BREAKING OUT AT APPROX 100 FT ABOVE THE RWY.
Narrative: DEVIATED FROM MDA (480 FT) WHILE ON APCH TO PDX ON ILS RWY 10L IVDG TO FULL ILS DECISION HT 226 FT (AND TO 126 FT AFTER SIGHTING THE ALS ON RWY 10L). I BELIEVE THIS WAS DUE TO THE POOR WORDING OF THE FDC NOTAM STATING 'ILS RWY 10L MINIMUMS NOT APPLICABLE MDA 480 FT.' CAPT AND I THOUGHT THE MDA APPLIED ONLY TO THE STRAIGHT-IN RWY 10L LOC, AND THEREFORE, CARRIED ON WITH THE FULL ILS RWY 10L APCH TO MINIMUMS, FOLLOWED BY UNEVENTFUL LNDG.
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.