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Flight crew of JS4100 descends below cleared altitude when captain is performing administrative duties and first officer misunderstands clearance.
| Attributes | |
| ACN | 637088 |
| Time | |
| Date | 200411 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl bound lower : 5300 msl bound upper : 8000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tracon : zzz.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Jetstream 41 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : multi engine pilot : atp pilot : cfi pilot : instrument |
| Experience | flight time last 90 days : 120 flight time total : 2500 flight time type : 1500 |
| ASRS Report | 637088 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued alert controller : issued new clearance 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:
I (PIC) was on the #2 radio talking to our operations (in-range call) and then was talking to the passenger about our ETA and WX, and the first officer knew this. I then told the first officer that I could take responsibility for the #1 radio. He informed me approach told him (when I was off the #1 radio) to descend from 8000 ft MSL to 5000 ft MSL. At 5300 ft, ATC asked us why we were descending. I stated we were going to 5000 ft. He then came back and said we were supposed to be at 7000 ft. We then started to climb back to 7000 ft. No TA or RA was present.
Original NASA ASRS Text
Title: FLT CREW OF JS4100 DSNDS BELOW CLRED ALT WHEN CAPT IS PERFORMING ADMINISTRATIVE DUTIES AND FO MISUNDERSTANDS CLRNC.
Narrative: I (PIC) WAS ON THE #2 RADIO TALKING TO OUR OPS (IN-RANGE CALL) AND THEN WAS TALKING TO THE PAX ABOUT OUR ETA AND WX, AND THE FO KNEW THIS. I THEN TOLD THE FO THAT I COULD TAKE RESPONSIBILITY FOR THE #1 RADIO. HE INFORMED ME APCH TOLD HIM (WHEN I WAS OFF THE #1 RADIO) TO DSND FROM 8000 FT MSL TO 5000 FT MSL. AT 5300 FT, ATC ASKED US WHY WE WERE DSNDING. I STATED WE WERE GOING TO 5000 FT. HE THEN CAME BACK AND SAID WE WERE SUPPOSED TO BE AT 7000 FT. WE THEN STARTED TO CLB BACK TO 7000 FT. NO TA OR RA WAS PRESENT.
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.