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An air carrier LJ24 freighter flight crew descended below their assigned altitude when they thought that the controller said 2300 ft versus 3300 ft.
| Attributes | |
| ACN | 432560 |
| Time | |
| Date | 199903 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : cnl.ils |
| State Reference | AR |
| Altitude | msl bound lower : 2800 msl bound upper : 3300 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : lit.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Learjet 24 |
| Operating Under FAR Part | Part 135 |
| Navigation In Use | ils localizer & glide slope : 4r |
| Flight Phase | descent : approach |
| Route In Use | approach : instrument precision |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 3700 flight time type : 747 |
| ASRS Report | 432530 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : multi engine |
| Experience | flight time last 90 days : 40 flight time total : 1500 flight time type : 400 |
| ASRS Report | 432556 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : far non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Upon descent into lit, we were cleared to 2300 ft MSL. 2300 ft MSL is the initial altitude for the runway 4R ILS. We responded, 'cleared to 2300 ft MSL.' upon descending through 2600 ft MSL, lit approach advised us we were cleared to 3300 ft MSL. We responded, 'that our clearance was to 2300 ft MSL.' ATC then advised us to remain at the altitude we were at (2800 ft MSL) and intercept the ILS runway 4R. ATC also said, 'it was no big deal, there was no traffic in the area.' we were then handed over to tower and no further action was taken or heard of.
Original NASA ASRS Text
Title: AN ACR LJ24 FREIGHTER FLC DSNDED BELOW THEIR ASSIGNED ALT WHEN THEY THOUGHT THAT THE CTLR SAID 2300 FT VERSUS 3300 FT.
Narrative: UPON DSCNT INTO LIT, WE WERE CLRED TO 2300 FT MSL. 2300 FT MSL IS THE INITIAL ALT FOR THE RWY 4R ILS. WE RESPONDED, 'CLRED TO 2300 FT MSL.' UPON DSNDING THROUGH 2600 FT MSL, LIT APCH ADVISED US WE WERE CLRED TO 3300 FT MSL. WE RESPONDED, 'THAT OUR CLRNC WAS TO 2300 FT MSL.' ATC THEN ADVISED US TO REMAIN AT THE ALT WE WERE AT (2800 FT MSL) AND INTERCEPT THE ILS RWY 4R. ATC ALSO SAID, 'IT WAS NO BIG DEAL, THERE WAS NO TFC IN THE AREA.' WE WERE THEN HANDED OVER TO TWR AND NO FURTHER ACTION WAS TAKEN OR HEARD OF.
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.