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An air carrier light transport descended below its assigned altitude causing less than standard separation.
| Attributes | |
| ACN | 226106 |
| Time | |
| Date | 199211 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : gmn airport : bfl |
| State Reference | CA |
| Altitude | msl bound lower : 9600 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : mbs |
| Operator | common carrier : air carrier |
| Make Model Name | Light Transport |
| Flight Phase | descent other |
| Route In Use | enroute airway : bfl |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 90 flight time total : 3000 flight time type : 200 |
| ASRS Report | 226106 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne less severe non adherence : clearance non adherence : required legal separation |
| Independent Detector | other controllera |
| 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:
We were proceeding direct to the locator OM for the ILS 30R bfl when approach cleared us from 16000 to 10000. IFR traffic was called to us at 2 O'clock and converging. Distracted by the search for traffic, we descended 400 ft below our assigned altitude before ATC pointed out our mistake. Corrective action was immediately taken. IFR separation was violated. The traffic was in sight by the time our mistake was discovered. Contributing factors were: the hotel that morning had missed my wake-up call. Forcing me to skip a shower, shave, breakfast and coffee and making us rush to make a departure. We were operating on reduced rest, making us less than sharp.
Original NASA ASRS Text
Title: AN ACR LTT DSNDED BELOW ITS ASSIGNED ALT CAUSING LTSS.
Narrative: WE WERE PROCEEDING DIRECT TO THE LOCATOR OM FOR THE ILS 30R BFL WHEN APCH CLRED US FROM 16000 TO 10000. IFR TFC WAS CALLED TO US AT 2 O'CLOCK AND CONVERGING. DISTRACTED BY THE SEARCH FOR TFC, WE DSNDED 400 FT BELOW OUR ASSIGNED ALT BEFORE ATC POINTED OUT OUR MISTAKE. CORRECTIVE ACTION WAS IMMEDIATELY TAKEN. IFR SEPARATION WAS VIOLATED. THE TFC WAS IN SIGHT BY THE TIME OUR MISTAKE WAS DISCOVERED. CONTRIBUTING FACTORS WERE: THE HOTEL THAT MORNING HAD MISSED MY WAKE-UP CALL. FORCING ME TO SKIP A SHOWER, SHAVE, BREAKFAST AND COFFEE AND MAKING US RUSH TO MAKE A DEP. WE WERE OPERATING ON REDUCED REST, MAKING US LESS THAN SHARP.
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.