 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Flight crew of medium large transport read back cleared to 10000'. ARTCC controller later climbed the flight back to 11000'.
| Attributes | |
| ACN | 135990 |
| Time | |
| Date | 199002 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : cgt |
| State Reference | IL |
| Altitude | msl bound lower : 10000 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : mia |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent : approach descent other |
| Route In Use | arrival other enroute airway : zau |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : atp pilot : instrument |
| Experience | flight time last 90 days : 200 flight time total : 11000 flight time type : 2100 |
| ASRS Report | 135990 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : commercial pilot : instrument |
| Events | |
| Anomaly | altitude deviation : overshoot |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | other |
Narrative:
Approaching chicago from the south, WX clear, radio frequency fairly uncongested, communications clear. Cruising at 12000' center issued clearance to descend to '1-0-thousand,' and I repeated cleared to '10-thousand.' level at 10000' for 1-2 mins when controller said, 'verify level at 1-1-thousand'! I replied 'no sir, you cleared us to 10-thousand.' he replied, 'climb to 1-1-thousand.' after landing I called center supervisor by phone. He knew of incident and indicated no traffic conflict had resulted and they were disregarding the event. I believe the clearance to 10000' was issued; however, once again the misinterp of '10' and '11' seems to occur more frequently than any other altitudes. The hearing error may have been mine; however, I must emphasize that I am 100 percent sure I repeated back 10 while setting the cockpit altitude alert system). The hearback problem we observe so often with ATC is again evident in this instance.
Original NASA ASRS Text
Title: FLT CREW OF MLG READ BACK CLEARED TO 10000'. ARTCC CTLR LATER CLIMBED THE FLT BACK TO 11000'.
Narrative: APCHING CHICAGO FROM THE S, WX CLR, RADIO FREQ FAIRLY UNCONGESTED, COMS CLR. CRUISING AT 12000' CENTER ISSUED CLRNC TO DSND TO '1-0-THOUSAND,' AND I REPEATED CLRED TO '10-THOUSAND.' LEVEL AT 10000' FOR 1-2 MINS WHEN CTLR SAID, 'VERIFY LEVEL AT 1-1-THOUSAND'! I REPLIED 'NO SIR, YOU CLRED US TO 10-THOUSAND.' HE REPLIED, 'CLB TO 1-1-THOUSAND.' AFTER LNDG I CALLED CENTER SUPVR BY PHONE. HE KNEW OF INCIDENT AND INDICATED NO TFC CONFLICT HAD RESULTED AND THEY WERE DISREGARDING THE EVENT. I BELIEVE THE CLRNC TO 10000' WAS ISSUED; HOWEVER, ONCE AGAIN THE MISINTERP OF '10' AND '11' SEEMS TO OCCUR MORE FREQUENTLY THAN ANY OTHER ALTS. THE HEARING ERROR MAY HAVE BEEN MINE; HOWEVER, I MUST EMPHASIZE THAT I AM 100 PERCENT SURE I REPEATED BACK 10 WHILE SETTING THE COCKPIT ALT ALERT SYSTEM). THE HEARBACK PROB WE OBSERVE SO OFTEN WITH ATC IS AGAIN EVIDENT IN THIS INSTANCE.
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.