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Air carrier widebody transport altitude deviation crossed smo 1000' below clearance altitude. Hydraulic failure had just been detected.
| Attributes | |
| ACN | 165378 |
| Time | |
| Date | 199012 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : smo airport : lax |
| State Reference | CA |
| Altitude | msl bound lower : 6000 msl bound upper : 7000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : lax |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 4 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise other descent other |
| Route In Use | arrival : profile descent |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 28000 |
| ASRS Report | 165378 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : crossing restriction not met altitude deviation : overshoot non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | flight crew : overcame equipment problem none taken : detected after the fact none taken : anomaly accepted |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We had just noticed a failure of our #1 hydraulic system with a complete loss of fluid. We understood lax approach to say, 'cross smo VOR at or below 7000', maintain 5000'.' we crossed smo at 6000'. Lax approach said they cleared us to cross smo at 7000', then descend to 5000'. Several components failed hydraulically, demanding our attention. Perhaps we didn't hear the controller correctly, perhaps we did!
Original NASA ASRS Text
Title: ACR WDB ALT DEVIATION CROSSED SMO 1000' BELOW CLRNC ALT. HYDRAULIC FAILURE HAD JUST BEEN DETECTED.
Narrative: WE HAD JUST NOTICED A FAILURE OF OUR #1 HYD SYS WITH A COMPLETE LOSS OF FLUID. WE UNDERSTOOD LAX APCH TO SAY, 'CROSS SMO VOR AT OR BELOW 7000', MAINTAIN 5000'.' WE CROSSED SMO AT 6000'. LAX APCH SAID THEY CLRED US TO CROSS SMO AT 7000', THEN DSND TO 5000'. SEVERAL COMPONENTS FAILED HYDRAULICALLY, DEMANDING OUR ATTN. PERHAPS WE DIDN'T HEAR THE CTLR CORRECTLY, PERHAPS WE DID!
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.