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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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When a near 90 degree course change was required at the initial approach fix for ILS 17 mdsd, dr, an airbus using autoflt turned short of the fix so as to roll out on course. The resulting route was close to a prohibited area.
| Attributes | |
| ACN | 498931 |
| Time | |
| Date | 200101 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : mdsd.airport |
| State Reference | FO |
| Altitude | msl single value : 3000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : mdsd.tracon tower : den.tower |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 19000 flight time type : 200 |
| ASRS Report | 498931 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : instrument pilot : commercial |
| Events | |
| Anomaly | non adherence : clearance non adherence : published procedure other spatial deviation |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Inbound sdq, descending 3000 ft MSL. Cleared direct to las OM for ILS runway 17. Placed las in 'direct to' box and sequenced remainder of ILS approach. Because of the amount of turn required, computer elected to 'smooth out' the course and failed to fly over las. This brought us close to prohibited area md(P)4. Now I know when to use the 'overfly' button on the FMGS.
Original NASA ASRS Text
Title: WHEN A NEAR 90 DEG COURSE CHANGE WAS REQUIRED AT THE INITIAL APCH FIX FOR ILS 17 MDSD, DR, AN AIRBUS USING AUTOFLT TURNED SHORT OF THE FIX SO AS TO ROLL OUT ON COURSE. THE RESULTING RTE WAS CLOSE TO A PROHIBITED AREA.
Narrative: INBOUND SDQ, DSNDING 3000 FT MSL. CLRED DIRECT TO LAS OM FOR ILS RWY 17. PLACED LAS IN 'DIRECT TO' BOX AND SEQUENCED REMAINDER OF ILS APCH. BECAUSE OF THE AMOUNT OF TURN REQUIRED, COMPUTER ELECTED TO 'SMOOTH OUT' THE COURSE AND FAILED TO FLY OVER LAS. THIS BROUGHT US CLOSE TO PROHIBITED AREA MD(P)4. NOW I KNOW WHEN TO USE THE 'OVERFLY' BUTTON ON THE FMGS.
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.