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Altitude deviation altitude overshot - air carrier crew descended below their clearance altitude then recovered just as the controller queried.
| Attributes | |
| ACN | 301770 |
| Time | |
| Date | 199504 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : jfk |
| State Reference | NY |
| Altitude | msl bound lower : 1100 msl bound upper : 1500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : n90 tower : den |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | instruction : instructor oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 120 flight time total : 12000 |
| ASRS Report | 301770 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain instruction : trainee |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot altitude deviation : excursion from assigned altitude non adherence : clearance |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
IOE captain flying left seat with check airman PIC in right seat. While being vectored to the jfk runway 4R localizer by approach control, we were cleared to descend and maintain 1500 ft. The PF (left seat) descended below the assigned altitude by approximately 400 ft. Ny approach questioned the altitude deviation and the PF immediately climbed to maintain 1500 ft. The aircraft altitude alert system was inoperative - deferred maintenance item - and both pilots were fatigued after an all night 14 hour duty flight. The altitude alert system should always be operational to aid in prevention of inadvertent altdevs.
Original NASA ASRS Text
Title: ALTDEV ALT OVERSHOT - ACR CREW DSNDED BELOW THEIR CLRNC ALT THEN RECOVERED JUST AS THE CTLR QUERIED.
Narrative: IOE CAPT FLYING L SEAT WITH CHK AIRMAN PIC IN R SEAT. WHILE BEING VECTORED TO THE JFK RWY 4R LOC BY APCH CTL, WE WERE CLRED TO DSND AND MAINTAIN 1500 FT. THE PF (L SEAT) DSNDED BELOW THE ASSIGNED ALT BY APPROX 400 FT. NY APCH QUESTIONED THE ALT DEV AND THE PF IMMEDIATELY CLBED TO MAINTAIN 1500 FT. THE ACFT ALT ALERT SYS WAS INOP - DEFERRED MAINT ITEM - AND BOTH PLTS WERE FATIGUED AFTER AN ALL NIGHT 14 HR DUTY FLT. THE ALT ALERT SYS SHOULD ALWAYS BE OPERATIONAL TO AID IN PREVENTION OF INADVERTENT ALTDEVS.
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.