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Pilot read back the wrong altitude which resulted in the aircraft descending below minimum safe altitude.
| Attributes | |
| ACN | 169351 |
| Time | |
| Date | 199101 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : slc |
| State Reference | UT |
| Altitude | msl bound lower : 12000 msl bound upper : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : slc tower : ttn |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other descent other |
| Route In Use | arrival other enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| ASRS Report | 169351 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : handoff position |
| Qualification | controller : developmental |
| Events | |
| Anomaly | non adherence : required legal separation non adherence : published procedure other spatial deviation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | Other |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
On the date above I was providing OJT on the jordan arrival sector. We accepted an automated handoff on medium large transport from salt lake center sector 32. On initial contact the developmental issued a clearance to medium large transport to turn right heading 020 degree intercept the slc 180 right and descend and maintain 13000 ft. The pilot read back the clearance. Several mins later we both observed medium large transport at 12000 ft in a 13000 ft MVA. After reviewing the tape it was found that medium large transport was issued 13000 ft but read back 12000 ft. Neither myself nor the developmental caught the error. I believe that the lack of stars into slc and the vague LOA between salt lake TRACON and salt lake center, require the arrival controller to give too many instructions to too many aircraft. Most readback errors are caught and corrected, some are not. The need for most of these readbacks could be eliminated by using stars and/or procedures that are more 'black and white'. Please feel free to call me for more information regarding this and other errors.
Original NASA ASRS Text
Title: PLT READ BACK THE WRONG ALT WHICH RESULTED IN THE ACFT DESCENDING BELOW MINIMUM SAFE ALT.
Narrative: ON THE DATE ABOVE I WAS PROVIDING OJT ON THE JORDAN ARR SECTOR. WE ACCEPTED AN AUTOMATED HDOF ON MLG FROM SALT LAKE CTR SECTOR 32. ON INITIAL CONTACT THE DEVELOPMENTAL ISSUED A CLRNC TO MLG TO TURN R HDG 020 DEG INTERCEPT THE SLC 180 R AND DSND AND MAINTAIN 13000 FT. THE PLT READ BACK THE CLRNC. SEVERAL MINS LATER WE BOTH OBSERVED MLG AT 12000 FT IN A 13000 FT MVA. AFTER REVIEWING THE TAPE IT WAS FOUND THAT MLG WAS ISSUED 13000 FT BUT READ BACK 12000 FT. NEITHER MYSELF NOR THE DEVELOPMENTAL CAUGHT THE ERROR. I BELIEVE THAT THE LACK OF STARS INTO SLC AND THE VAGUE LOA BTWN SALT LAKE TRACON AND SALT LAKE CTR, REQUIRE THE ARR CTLR TO GIVE TOO MANY INSTRUCTIONS TO TOO MANY ACFT. MOST READBACK ERRORS ARE CAUGHT AND CORRECTED, SOME ARE NOT. THE NEED FOR MOST OF THESE READBACKS COULD BE ELIMINATED BY USING STARS AND/OR PROCS THAT ARE MORE 'BLACK AND WHITE'. PLEASE FEEL FREE TO CALL ME FOR MORE INFO REGARDING THIS AND OTHER ERRORS.
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.