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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Altitude deviation. Miscom between ATC and flight crew. Clearance to 10000 ft and flight crew misheard as 11000 ft. Controller intervened when flight crew climbed past 10000 ft.
| Attributes | |
| ACN | 338559 |
| Time | |
| Date | 199606 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : tys |
| State Reference | TN |
| Altitude | msl bound lower : 10000 msl bound upper : 10500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : tys |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute airway : tys |
| 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 : 9000 flight time type : 2500 |
| ASRS Report | 338559 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 200 flight time total : 7000 flight time type : 300 |
| ASRS Report | 338450 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On departure, we were given a 180 degree turn and clearance to 10000 ft. The first officer mistakenly understood 11000 ft and put that in the altitude alert. While hand-flying, turning, cleaning up and doing checklists, I missed his mistake and climbed to 10500 ft when ATC notified us of our error. Supplemental information from acn 338450: at 10500 ft, the controller said confirm climb to 10000 ft and I said 'sorry I thought we were cleared to 11000 ft, we are correcting back to 10000 ft.' I think I made this mistake because departure control cleared us to 'one-zero thousand ft,' instead of 'ten thousand ft' and I thought I heard 'one-one thousand ft.' the phrases 'ten' and 'eleven' are better and clearer than 'one-zero' or 'one- one.'
Original NASA ASRS Text
Title: ALTDEV. MISCOM BTWN ATC AND FLC. CLRNC TO 10000 FT AND FLC MISHEARD AS 11000 FT. CTLR INTERVENED WHEN FLC CLBED PAST 10000 FT.
Narrative: ON DEP, WE WERE GIVEN A 180 DEG TURN AND CLRNC TO 10000 FT. THE FO MISTAKENLY UNDERSTOOD 11000 FT AND PUT THAT IN THE ALT ALERT. WHILE HAND-FLYING, TURNING, CLEANING UP AND DOING CHKLISTS, I MISSED HIS MISTAKE AND CLBED TO 10500 FT WHEN ATC NOTIFIED US OF OUR ERROR. SUPPLEMENTAL INFO FROM ACN 338450: AT 10500 FT, THE CTLR SAID CONFIRM CLB TO 10000 FT AND I SAID 'SORRY I THOUGHT WE WERE CLRED TO 11000 FT, WE ARE CORRECTING BACK TO 10000 FT.' I THINK I MADE THIS MISTAKE BECAUSE DEP CTL CLRED US TO 'ONE-ZERO THOUSAND FT,' INSTEAD OF 'TEN THOUSAND FT' AND I THOUGHT I HEARD 'ONE-ONE THOUSAND FT.' THE PHRASES 'TEN' AND 'ELEVEN' ARE BETTER AND CLEARER THAN 'ONE-ZERO' OR 'ONE- ONE.'
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.