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An air carrier medium large transport flight crew performs a takeoff when the visibility is below charted minimums for the specific runway in use. First officer reporter later admits error.
| Attributes | |
| ACN | 384190 |
| Time | |
| Date | 199710 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : dsm |
| State Reference | IA |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : takeoff |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial pilot : cfi |
| Experience | flight time last 90 days : 200 flight time total : 1700 flight time type : 500 |
| ASRS Report | 384190 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | non adherence : far 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 other |
Narrative:
Our operations specifications specify that we can depart with 1/4 mi visibility with adequate visual reference. We had that. IFR takeoff runway 5 said we needed 300 ft 1 mi. We departed with 1/2 mi visibility. In retrospect, I believe that charted minimums override operations specifications.
Original NASA ASRS Text
Title: AN ACR MLG FLC PERFORMS A TKOF WHEN THE VISIBILITY IS BELOW CHARTED MINIMUMS FOR THE SPECIFIC RWY IN USE. FO RPTR LATER ADMITS ERROR.
Narrative: OUR OPS SPECS SPECIFY THAT WE CAN DEPART WITH 1/4 MI VISIBILITY WITH ADEQUATE VISUAL REF. WE HAD THAT. IFR TKOF RWY 5 SAID WE NEEDED 300 FT 1 MI. WE DEPARTED WITH 1/2 MI VISIBILITY. IN RETROSPECT, I BELIEVE THAT CHARTED MINIMUMS OVERRIDE OPS SPECS.
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.