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Flight crew of a cpr widebody transport test flight mistakenly started climb from high altitude cruise prior to being cleared by ATC.
| Attributes | |
| ACN | 296945 |
| Time | |
| Date | 199502 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : slc |
| State Reference | UT |
| Altitude | msl bound lower : 33000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zlc |
| Operator | general aviation : corporate |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 5000 flight time type : 500 |
| ASRS Report | 296945 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | other |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
While conducting a flight test, I was distracted with a conversation with flight test engineers about the test sequence and misinterpreted ZLC's discussion about our altitude. Apparently they told us we would have to climb or descend for a traffic conflict down the road. We said we'd prefer to climb and said FL350 would be acceptable. They apparently said something about FL350 which I thought was a clearance and I started the climb from FL330. Passing FL340 they asked if we were in a climb and we responded out of FL340 for FL350. Several mins later, ZLC told us we had never been cleared to FL350, but to maintain FL350 since we were there.
Original NASA ASRS Text
Title: FLC OF A CPR WDB TEST FLT MISTAKENLY STARTED CLB FROM HIGH ALT CRUISE PRIOR TO BEING CLRED BY ATC.
Narrative: WHILE CONDUCTING A FLT TEST, I WAS DISTRACTED WITH A CONVERSATION WITH FLT TEST ENGINEERS ABOUT THE TEST SEQUENCE AND MISINTERPRETED ZLC'S DISCUSSION ABOUT OUR ALT. APPARENTLY THEY TOLD US WE WOULD HAVE TO CLB OR DSND FOR A TFC CONFLICT DOWN THE ROAD. WE SAID WE'D PREFER TO CLB AND SAID FL350 WOULD BE ACCEPTABLE. THEY APPARENTLY SAID SOMETHING ABOUT FL350 WHICH I THOUGHT WAS A CLRNC AND I STARTED THE CLB FROM FL330. PASSING FL340 THEY ASKED IF WE WERE IN A CLB AND WE RESPONDED OUT OF FL340 FOR FL350. SEVERAL MINS LATER, ZLC TOLD US WE HAD NEVER BEEN CLRED TO FL350, BUT TO MAINTAIN FL350 SINCE WE WERE THERE.
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.