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B737 flight overshoots its assigned altitude of FL330 when the PIC read back the wrong altitude to ARTCC controller at ZOA, ca.
| Attributes | |
| ACN | 509720 |
| Time | |
| Date | 200104 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : mod.vor |
| State Reference | CA |
| Altitude | msl bound lower : 31000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | A300 |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 509720 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance |
| Resolutory Action | controller : issued advisory flight crew : returned to assigned altitude |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance ATC Facility ATC Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
FL350, received clearance from oak to descend to FL310. I read back 'air carrier XXXX, descend and maintain FL310.' 60 mi east of mod, descending through FL324, ATC said 'air carrier XXXX, turn right 40 degrees, maintain 330.' I said 'we were cleared to 310, do you want us to climb back up to FL330?' ATC said 'yes, you were cleared to FL330.' I said 'I read back FL310.' ATC did not respond. Upon leveloff at FL330, ATC cleared us direct mod with no further comments. The initial clearance from ATC was slightly garbled. I thought I heard FL310, so I read that back to ATC. I accepted hs lack of response as clarification of his clearance to FL310. Next time there is any hesitation on my part, I will ask ATC for clarification.
Original NASA ASRS Text
Title: B737 FLT OVERSHOOTS ITS ASSIGNED ALT OF FL330 WHEN THE PIC READ BACK THE WRONG ALT TO ARTCC CTLR AT ZOA, CA.
Narrative: FL350, RECEIVED CLRNC FROM OAK TO DSND TO FL310. I READ BACK 'ACR XXXX, DSND AND MAINTAIN FL310.' 60 MI E OF MOD, DSNDING THROUGH FL324, ATC SAID 'ACR XXXX, TURN R 40 DEGS, MAINTAIN 330.' I SAID 'WE WERE CLRED TO 310, DO YOU WANT US TO CLB BACK UP TO FL330?' ATC SAID 'YES, YOU WERE CLRED TO FL330.' I SAID 'I READ BACK FL310.' ATC DID NOT RESPOND. UPON LEVELOFF AT FL330, ATC CLRED US DIRECT MOD WITH NO FURTHER COMMENTS. THE INITIAL CLRNC FROM ATC WAS SLIGHTLY GARBLED. I THOUGHT I HEARD FL310, SO I READ THAT BACK TO ATC. I ACCEPTED HS LACK OF RESPONSE AS CLARIFICATION OF HIS CLRNC TO FL310. NEXT TIME THERE IS ANY HESITATION ON MY PART, I WILL ASK ATC FOR CLARIFICATION.
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.