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BAE4100 flight crew overshot their altitude in descent when the first officer misunderstands their clearance and missets the altitude alerter. The PIC is busy with the logbook and fails to catch the error in the altitude alert until 700 ft past their altitude.
| Attributes | |
| ACN | 380900 |
| Time | |
| Date | 199709 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : csn |
| State Reference | VA |
| Altitude | msl bound lower : 9300 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc |
| Operator | common carrier : air carrier |
| Make Model Name | Jetstream 41 |
| Operating Under FAR Part | Part 135 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | enroute : direct enroute other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 380900 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 240 flight time total : 3300 flight time type : 1000 |
| ASRS Report | 380911 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance non adherence other other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : became reoriented |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We were flying at 11000 ft from lyh direct csn. It was a bumpy flight. PF requested that PNF request 9000 ft from ATC. PNF was filling out flight log at this time but requested 9000 ft from ATC. ATC, now cleared us to 10000 ft. PNF read back clearance to 10000 ft and returned to filling out flight log. PF thought he was cleared to 9000 ft (correct altitude for direction of flight) and started his descent. PNF looked up from paperwork, noticed the altitude deviation and immediately told the PF who corrected the deviation within seconds. There were no conflicts with other traffic. Supplemental information from acn 380911: PF heard 9000 ft set 9000 ft in altitude select. PNF did not notice the altitude and continued on filling logbook.
Original NASA ASRS Text
Title: BAE4100 FLC OVERSHOT THEIR ALT IN DSCNT WHEN THE FO MISUNDERSTANDS THEIR CLRNC AND MISSETS THE ALT ALERTER. THE PIC IS BUSY WITH THE LOGBOOK AND FAILS TO CATCH THE ERROR IN THE ALT ALERT UNTIL 700 FT PAST THEIR ALT.
Narrative: WE WERE FLYING AT 11000 FT FROM LYH DIRECT CSN. IT WAS A BUMPY FLT. PF REQUESTED THAT PNF REQUEST 9000 FT FROM ATC. PNF WAS FILLING OUT FLT LOG AT THIS TIME BUT REQUESTED 9000 FT FROM ATC. ATC, NOW CLRED US TO 10000 FT. PNF READ BACK CLRNC TO 10000 FT AND RETURNED TO FILLING OUT FLT LOG. PF THOUGHT HE WAS CLRED TO 9000 FT (CORRECT ALT FOR DIRECTION OF FLT) AND STARTED HIS DSCNT. PNF LOOKED UP FROM PAPERWORK, NOTICED THE ALTDEV AND IMMEDIATELY TOLD THE PF WHO CORRECTED THE DEV WITHIN SECONDS. THERE WERE NO CONFLICTS WITH OTHER TFC. SUPPLEMENTAL INFO FROM ACN 380911: PF HEARD 9000 FT SET 9000 FT IN ALT SELECT. PNF DID NOT NOTICE THE ALT AND CONTINUED ON FILLING LOGBOOK.
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.