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Air carrier receives clearance to FL230. Readback acknowledged. At handoff requests confirmation of altitude and is told FL200.
| Attributes | |
| ACN | 138399 |
| Time | |
| Date | 199003 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : pdx |
| State Reference | OR |
| Altitude | msl bound lower : 20000 msl bound upper : 28000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zse |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| 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 : 250 flight time total : 16000 |
| ASRS Report | 138399 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | altitude deviation : overshoot |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Deviation |
Narrative:
Reporting into ZSE on frequency 119.65, I was instructed to climb to FL230. I then read back the climb clearance and received an acknowledgement from center. I was suspicious that a wrong altitude had been assigned and talked it over with the copilot. Passing through FL198 I was given a frequency change to ZSE on 126.6, but before switching over to the new frequency I asked the controller to confirm my climb to FL230. He replied that I was cleared to FL200 only. I then immediately stopped the climb, reaching a maximum altitude of FL208, and began a descent to FL200. I then contacted ZSE on frequency 126.6. While the altitude incursion was happening, no traffic conflict was observed or reported by ZSE. Later I initiated a call to the ZSE supervisor to inquire about the incident. He informed me that no traffic conflict occurred, but recommended that I submit a NASA form.
Original NASA ASRS Text
Title: ACR RECEIVES CLRNC TO FL230. READBACK ACKNOWLEDGED. AT HANDOFF REQUESTS CONFIRMATION OF ALT AND IS TOLD FL200.
Narrative: RPTING INTO ZSE ON FREQ 119.65, I WAS INSTRUCTED TO CLB TO FL230. I THEN READ BACK THE CLB CLRNC AND RECEIVED AN ACKNOWLEDGEMENT FROM CENTER. I WAS SUSPICIOUS THAT A WRONG ALT HAD BEEN ASSIGNED AND TALKED IT OVER WITH THE COPLT. PASSING THROUGH FL198 I WAS GIVEN A FREQ CHANGE TO ZSE ON 126.6, BUT BEFORE SWITCHING OVER TO THE NEW FREQ I ASKED THE CTLR TO CONFIRM MY CLB TO FL230. HE REPLIED THAT I WAS CLRED TO FL200 ONLY. I THEN IMMEDIATELY STOPPED THE CLB, REACHING A MAX ALT OF FL208, AND BEGAN A DSCNT TO FL200. I THEN CONTACTED ZSE ON FREQ 126.6. WHILE THE ALT INCURSION WAS HAPPENING, NO TFC CONFLICT WAS OBSERVED OR RPTED BY ZSE. LATER I INITIATED A CALL TO THE ZSE SUPVR TO INQUIRE ABOUT THE INCIDENT. HE INFORMED ME THAT NO TFC CONFLICT OCCURRED, BUT RECOMMENDED THAT I SUBMIT A NASA FORM.
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.