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Cpr small transport aircraft mishears their descent clearance as 10000 ft versus issued altitude of 11000 ft. Center misses the readback. Checking in with approach, flight crew reads descent to 10000 ft and this controller misses the number as well. Reaching 10400 ft, approach indicates the clearance was to 11000 ft. They climb to 11000 ft.
| Attributes | |
| ACN | 427970 |
| Time | |
| Date | 199902 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : cid.airport |
| State Reference | IA |
| Altitude | msl bound lower : 10400 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.artcc tower : cid.tower |
| Operator | general aviation : corporate |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : multi engine pilot : cfi pilot : commercial |
| Experience | flight time last 90 days : 140 flight time total : 24380 flight time type : 430 |
| ASRS Report | 427970 |
| Person 2 | |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : multi engine pilot : instrument pilot : commercial pilot : cfi |
| Experience | flight time last 90 days : 140 flight time total : 18265 flight time type : 4960 |
| ASRS Report | 427976 |
| Events | |
| Anomaly | altitude deviation : overshoot |
| Independent Detector | other controllerb |
| Resolutory Action | controller : issued new clearance flight crew : returned to original clearance |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance |
| Primary Problem | Ambiguous |
Narrative:
Aircraft in descent into cid for landing. ZAU cleared us down to 11000 ft and handed us over to cedar rapids approach control. I thought he said 10000 ft. I checked in with the cedar rapids controller and said 'our of 15000 ft for 10000 ft.' the cid controller read back 10000 ft and we continued to descend. At 10400 ft, cid called us and said we were supposed to stop at 11000 ft. We acknowledged and climbed back to 11000 ft. No other aircraft were involved. Upon landing, the tower had us call them on the phone and said we broke our altitude and were in violation. The tower should have caught the error.
Original NASA ASRS Text
Title: CPR SMT ACFT MISHEARS THEIR DSCNT CLRNC AS 10000 FT VERSUS ISSUED ALT OF 11000 FT. CTR MISSES THE READBACK. CHKING IN WITH APCH, FLC READS DSCNT TO 10000 FT AND THIS CTLR MISSES THE NUMBER AS WELL. REACHING 10400 FT, APCH INDICATES THE CLRNC WAS TO 11000 FT. THEY CLB TO 11000 FT.
Narrative: ACFT IN DSCNT INTO CID FOR LNDG. ZAU CLRED US DOWN TO 11000 FT AND HANDED US OVER TO CEDAR RAPIDS APCH CTL. I THOUGHT HE SAID 10000 FT. I CHKED IN WITH THE CEDAR RAPIDS CTLR AND SAID 'OUR OF 15000 FT FOR 10000 FT.' THE CID CTLR READ BACK 10000 FT AND WE CONTINUED TO DSND. AT 10400 FT, CID CALLED US AND SAID WE WERE SUPPOSED TO STOP AT 11000 FT. WE ACKNOWLEDGED AND CLBED BACK TO 11000 FT. NO OTHER ACFT WERE INVOLVED. UPON LNDG, THE TWR HAD US CALL THEM ON THE PHONE AND SAID WE BROKE OUR ALT AND WERE IN VIOLATION. THE TWR SHOULD HAVE CAUGHT THE 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.