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A320 crew set qnh above the transition altitude.
| Attributes | |
| ACN | 474893 |
| Time | |
| Date | 200006 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : okk.vor |
| State Reference | IN |
| Altitude | msl bound lower : 23650 msl bound upper : 24000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : cfi pilot : flight engineer pilot : multi engine |
| Experience | flight time last 90 days : 200 flight time total : 11000 flight time type : 1200 |
| ASRS Report | 474893 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : instrument pilot : commercial pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 220 flight time total : 4000 flight time type : 390 |
| ASRS Report | 474490 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : published procedure non adherence : clearance non adherence : company policies non adherence : far other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued alert flight crew : returned to assigned altitude |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We had just briefed approach and preset altimeter setting before returning FCU to qne (29.92). A momentary distraction resulted in a gradual driftdown of 350 ft to FL236.5 instead of FL240. ATC queried our altitude, which we promptly corrected by 1) resetting altimeter to qne, and 2) adjusting altitude back to FL240. No conflict or further concern was expressed by ATC. Remainder of flight operated normally and without incident. Supplemental information from acn 474490: level at FL240, I was giving the approach briefing for runway 4R for ord. In the brief, I gave and set the local altimeter setting for ord, but did not reset it back to standard 29.92. This caused a gradual driftdown to FL236.4. ATC asked us if we were level at FL240 and we corrected immediately setting in the correct altimeter setting of 29.92 (qne) and climbing back to FL240. When we reached FL240 we informed ATC. After that, operations normal all the way to ord.
Original NASA ASRS Text
Title: A320 CREW SET QNH ABOVE THE TRANSITION ALT.
Narrative: WE HAD JUST BRIEFED APCH AND PRESET ALTIMETER SETTING BEFORE RETURNING FCU TO QNE (29.92). A MOMENTARY DISTR RESULTED IN A GRADUAL DRIFTDOWN OF 350 FT TO FL236.5 INSTEAD OF FL240. ATC QUERIED OUR ALT, WHICH WE PROMPTLY CORRECTED BY 1) RESETTING ALTIMETER TO QNE, AND 2) ADJUSTING ALT BACK TO FL240. NO CONFLICT OR FURTHER CONCERN WAS EXPRESSED BY ATC. REMAINDER OF FLT OPERATED NORMALLY AND WITHOUT INCIDENT. SUPPLEMENTAL INFO FROM ACN 474490: LEVEL AT FL240, I WAS GIVING THE APCH BRIEFING FOR RWY 4R FOR ORD. IN THE BRIEF, I GAVE AND SET THE LCL ALTIMETER SETTING FOR ORD, BUT DID NOT RESET IT BACK TO STANDARD 29.92. THIS CAUSED A GRADUAL DRIFTDOWN TO FL236.4. ATC ASKED US IF WE WERE LEVEL AT FL240 AND WE CORRECTED IMMEDIATELY SETTING IN THE CORRECT ALTIMETER SETTING OF 29.92 (QNE) AND CLBING BACK TO FL240. WHEN WE REACHED FL240 WE INFORMED ATC. AFTER THAT, OPS NORMAL ALL THE WAY TO ORD.
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.