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Air carrier medium large transport on ASR approach to runway 21 at sat given premature descent to MDA, resulting in conflict with obstacle.
| Attributes | |
| ACN | 139193 |
| Time | |
| Date | 199003 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : sat |
| State Reference | TX |
| Altitude | msl bound lower : 1800 msl bound upper : 1900 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : sat artcc : zjx |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport |
| Flight Phase | descent : approach |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 150 flight time total : 11000 flight time type : 2000 |
| ASRS Report | 139193 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot other anomaly other other spatial deviation |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Received clearance to descend to MDA on ASR 21 approach by approach control. Descending below overcast noticed red lighted towers passing below left side of aircraft. Seemed closer than would be normal. Approach plate showed tower to be 1459' MSL clearance allowed descent to 1280' MSL before passing obstruction. No DME available for runway 21 for crew to accurately determine location. Must rely only on ATC for sep and vertical navigation. No backup for ATC error.
Original NASA ASRS Text
Title: ACR MLG ON ASR APCH TO RWY 21 AT SAT GIVEN PREMATURE DESCENT TO MDA, RESULTING IN CONFLICT WITH OBSTACLE.
Narrative: RECEIVED CLRNC TO DSND TO MDA ON ASR 21 APCH BY APCH CTL. DSNDING BELOW OVCST NOTICED RED LIGHTED TWRS PASSING BELOW L SIDE OF ACFT. SEEMED CLOSER THAN WOULD BE NORMAL. APCH PLATE SHOWED TWR TO BE 1459' MSL CLRNC ALLOWED DSCNT TO 1280' MSL BEFORE PASSING OBSTRUCTION. NO DME AVAILABLE FOR RWY 21 FOR CREW TO ACCURATELY DETERMINE LOCATION. MUST RELY ONLY ON ATC FOR SEP AND VERTICAL NAV. NO BACKUP FOR ATC ERROR.
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.