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Altitude deviation altitude overshot -- air carrier crew is cleared to FL230 and given an 'expect clearance to' of 10000 ft. The captain puts 10000 ft in the altitude alerter and, of course, the flight crew descends below their cleared altitude.
| Attributes | |
| ACN | 321730 |
| Time | |
| Date | 199511 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : hou |
| State Reference | TX |
| Altitude | msl bound lower : 22000 msl bound upper : 23000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zhu |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 14000 flight time type : 1000 |
| ASRS Report | 321730 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 4400 flight time type : 700 |
| ASRS Report | 321729 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : far non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action other |
| Consequence | faa : reviewed incident with flight crew faa : investigated |
| Miss Distance | horizontal : 3000 vertical : 2000 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We misunderstood the clearance to descend to FL230 and expect to cross lisey intersection at 10000 ft. 10000 ft was put into alerter! On TCASII we first observed traffic and reduced our descent. Center asked if we had our traffic then questioned our altitude as we stopped our descent. Both aircraft had resolution alerts and center reassigned FL200 to them and FL220 to us. We should have had both pilots absolutely sure about our assigned altitude.
Original NASA ASRS Text
Title: ALTDEV ALT OVERSHOT -- ACR CREW IS CLRED TO FL230 AND GIVEN AN 'EXPECT CLRNC TO' OF 10000 FT. THE CAPT PUTS 10000 FT IN THE ALT ALERTER AND, OF COURSE, THE FLC DSNDS BELOW THEIR CLRED ALT.
Narrative: WE MISUNDERSTOOD THE CLRNC TO DSND TO FL230 AND EXPECT TO CROSS LISEY INTXN AT 10000 FT. 10000 FT WAS PUT INTO ALERTER! ON TCASII WE FIRST OBSERVED TFC AND REDUCED OUR DSCNT. CTR ASKED IF WE HAD OUR TFC THEN QUESTIONED OUR ALT AS WE STOPPED OUR DSCNT. BOTH ACFT HAD RESOLUTION ALERTS AND CTR REASSIGNED FL200 TO THEM AND FL220 TO US. WE SHOULD HAVE HAD BOTH PLTS ABSOLUTELY SURE ABOUT OUR ASSIGNED ALT.
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.