 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
MD80 given clearance to 2000 ft on IAP ILS approach runway 12 to sat. Altitude was 800 ft below the MVA. Flight crew deviation. Tower issued low altitude alert.
| Attributes | |
| ACN | 371871 |
| Time | |
| Date | 199703 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : sat |
| State Reference | TX |
| Altitude | msl bound lower : 2000 msl bound upper : 3000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tracon : sat tower : sat artcc : ztl |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Super 80 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | cruise other descent : approach |
| Route In Use | arrival other enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 371871 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : published procedure non adherence : clearance other anomaly other other spatial deviation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Pilot Deviation Operational Deviation |
Narrative:
Sat approach control, ILS runway 12R sat. While being vectored for the runway 12R approach at sat, we heard and read back a new lower altitude of 2000 ft for the initial approach instead of 3000 ft. The 2000 ft assignment was heard by captain, first officer and air carrier jump seat rider. We were subsequently shifted over to the tower who stated that our altitude was low and that the MVA was 2800 ft and initial approach altitude was 3000 ft. We quickly ascended to 3000 ft. Adding to this confusion was a vector for the ILS intercept that caused us to fly through the ILS localizer, and then had to reintercept the localizer from the west side of the approach. WX was 10 mi visibility with 2400 ft broken, 3100 ft overcast. We had visual contact with the ground almost immediately after descending below 3000 ft MSL.
Original NASA ASRS Text
Title: MD80 GIVEN CLRNC TO 2000 FT ON IAP ILS APCH RWY 12 TO SAT. ALT WAS 800 FT BELOW THE MVA. FLC DEV. TWR ISSUED LOW ALT ALERT.
Narrative: SAT APCH CTL, ILS RWY 12R SAT. WHILE BEING VECTORED FOR THE RWY 12R APCH AT SAT, WE HEARD AND READ BACK A NEW LOWER ALT OF 2000 FT FOR THE INITIAL APCH INSTEAD OF 3000 FT. THE 2000 FT ASSIGNMENT WAS HEARD BY CAPT, FO AND ACR JUMP SEAT RIDER. WE WERE SUBSEQUENTLY SHIFTED OVER TO THE TWR WHO STATED THAT OUR ALT WAS LOW AND THAT THE MVA WAS 2800 FT AND INITIAL APCH ALT WAS 3000 FT. WE QUICKLY ASCENDED TO 3000 FT. ADDING TO THIS CONFUSION WAS A VECTOR FOR THE ILS INTERCEPT THAT CAUSED US TO FLY THROUGH THE ILS LOC, AND THEN HAD TO REINTERCEPT THE LOC FROM THE W SIDE OF THE APCH. WX WAS 10 MI VISIBILITY WITH 2400 FT BROKEN, 3100 FT OVCST. WE HAD VISUAL CONTACT WITH THE GND ALMOST IMMEDIATELY AFTER DSNDING BELOW 3000 FT MSL.
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.