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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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An air carrier medium large transport aircraft in cruise was cleared to descend 4000 ft. Reporter first officer started descent, but decided to wait and when climbing back to assigned overshot by 500 ft.
| Attributes | |
| ACN | 378170 |
| Time | |
| Date | 199708 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : zla |
| State Reference | CA |
| Altitude | msl bound lower : 28000 msl bound upper : 28500 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla tower : bgm |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other descent other |
| Route In Use | enroute airway : zla |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 6000 flight time type : 4000 |
| ASRS Report | 378170 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Given pilot's discretion from FL280 to FL240. Was going to start down, changed my mind. Went down 100 ft, then used vsi 250 FPM to climb back to FL280. I thought it would capture FL280 -- it did not. It reached FL285 when I saw the problem and then I rapidly descended to FL240. Will avoid situation in the future, will always ensure altitude capture. No traffic conflict, no ATC communication received regarding altitude bust.
Original NASA ASRS Text
Title: AN ACR MLG ACFT IN CRUISE WAS CLRED TO DSND 4000 FT. RPTR FO STARTED DSCNT, BUT DECIDED TO WAIT AND WHEN CLBING BACK TO ASSIGNED OVERSHOT BY 500 FT.
Narrative: GIVEN PLT'S DISCRETION FROM FL280 TO FL240. WAS GOING TO START DOWN, CHANGED MY MIND. WENT DOWN 100 FT, THEN USED VSI 250 FPM TO CLB BACK TO FL280. I THOUGHT IT WOULD CAPTURE FL280 -- IT DID NOT. IT REACHED FL285 WHEN I SAW THE PROB AND THEN I RAPIDLY DSNDED TO FL240. WILL AVOID SIT IN THE FUTURE, WILL ALWAYS ENSURE ALT CAPTURE. NO TFC CONFLICT, NO ATC COM RECEIVED REGARDING ALT BUST.
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.