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During descent from FL350 to FL240 at 250 KTS, rptrs were cleared to hold at sinca. Just prior to leveloff at FL240, rptrs received an amended clearance to FL240. On questioning the controller the rptrs learned they had been given an amended clearance to FL250 that according to the controller was read back. None of the 3 pilots were aware of the FL250 clearance or readback.
| Attributes | |
| ACN | 331240 |
| Time | |
| Date | 199603 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : atl |
| State Reference | GA |
| Altitude | msl bound lower : 24000 msl bound upper : 25000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl tower : phl |
| Operator | common carrier : air carrier |
| Make Model Name | L-1011 Tri-Star All Series |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : flight engineer pilot : commercial pilot : instrument |
| Experience | flight time total : 2500 |
| ASRS Report | 331240 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 125 flight time total : 10000 flight time type : 800 |
| ASRS Report | 331239 |
| Events | |
| Anomaly | altitude deviation : overshoot |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
During descent from FL350 to FL240, 250 KTS, cleared to hold at sinca. Just prior to/at leveloff at FL240. Center questioned our altitude. Center said he had amended our altitude earlier to FL250. He said we should now maintain FL240. We never received or acknowledged the change to maintain FL250.
Original NASA ASRS Text
Title: DURING DSCNT FROM FL350 TO FL240 AT 250 KTS, RPTRS WERE CLRED TO HOLD AT SINCA. JUST PRIOR TO LEVELOFF AT FL240, RPTRS RECEIVED AN AMENDED CLRNC TO FL240. ON QUESTIONING THE CTLR THE RPTRS LEARNED THEY HAD BEEN GIVEN AN AMENDED CLRNC TO FL250 THAT ACCORDING TO THE CTLR WAS READ BACK. NONE OF THE 3 PLTS WERE AWARE OF THE FL250 CLRNC OR READBACK.
Narrative: DURING DSCNT FROM FL350 TO FL240, 250 KTS, CLRED TO HOLD AT SINCA. JUST PRIOR TO/AT LEVELOFF AT FL240. CTR QUESTIONED OUR ALT. CTR SAID HE HAD AMENDED OUR ALT EARLIER TO FL250. HE SAID WE SHOULD NOW MAINTAIN FL240. WE NEVER RECEIVED OR ACKNOWLEDGED THE CHANGE TO MAINTAIN FL250.
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.