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A B737-300 climbs above the assigned crossing altitude prior to the sjc VOR during the loop 9 departure procedure.
| Attributes | |
| ACN | 429388 |
| Time | |
| Date | 199902 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : sjc.vor |
| State Reference | CA |
| Altitude | msl bound lower : 12000 msl bound upper : 15000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : o90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other other vortac |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure sid : loop 9 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : cfi pilot : flight engineer |
| Experience | flight time last 90 days : 200 |
| ASRS Report | 429388 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance non adherence : published procedure |
| Independent Detector | atc equipment other atc equipment : radar - mode c other controllera |
| Resolutory Action | controller : issued new clearance controller : issued advisory flight crew : overrode automation |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We departed sjc sbound on the loop 9 departure. The captain was flying. The autoplt was engaged with LNAV. ATC gave us the clearance 'turn right to the sjc VOR, cross it at 12000 ft, then climb and maintain FL230.' while turning, the autoplt rolled out 30 degrees prematurely as if it was on an intercept. The captain disconnected the autoplt and hand flew the aircraft. In the meantime he had dialed in 230 degrees in the MCP window for the next higher altitude. The FMS was programmed to level at 12000 ft until the VOR, but when he disconnected the autoplt we received no aural warning approaching 12000 ft because FL230 was now set. The aircraft climbed to approximately 15000 ft about 2 mi prior to the VOR. ATC called and queried us and then cleared us to FL230. In the future, I would not engage the FMS until clear of the departure area and maybe even cruise. I'm new to the FMS and I don't think it's all that great.
Original NASA ASRS Text
Title: A B737-300 CLBS ABOVE THE ASSIGNED XING ALT PRIOR TO THE SJC VOR DURING THE LOOP 9 DEP PROC.
Narrative: WE DEPARTED SJC SBOUND ON THE LOOP 9 DEP. THE CAPT WAS FLYING. THE AUTOPLT WAS ENGAGED WITH LNAV. ATC GAVE US THE CLRNC 'TURN R TO THE SJC VOR, CROSS IT AT 12000 FT, THEN CLB AND MAINTAIN FL230.' WHILE TURNING, THE AUTOPLT ROLLED OUT 30 DEGS PREMATURELY AS IF IT WAS ON AN INTERCEPT. THE CAPT DISCONNECTED THE AUTOPLT AND HAND FLEW THE ACFT. IN THE MEANTIME HE HAD DIALED IN 230 DEGS IN THE MCP WINDOW FOR THE NEXT HIGHER ALT. THE FMS WAS PROGRAMMED TO LEVEL AT 12000 FT UNTIL THE VOR, BUT WHEN HE DISCONNECTED THE AUTOPLT WE RECEIVED NO AURAL WARNING APCHING 12000 FT BECAUSE FL230 WAS NOW SET. THE ACFT CLBED TO APPROX 15000 FT ABOUT 2 MI PRIOR TO THE VOR. ATC CALLED AND QUERIED US AND THEN CLRED US TO FL230. IN THE FUTURE, I WOULD NOT ENGAGE THE FMS UNTIL CLR OF THE DEP AREA AND MAYBE EVEN CRUISE. I'M NEW TO THE FMS AND I DON'T THINK IT'S ALL THAT GREAT.
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.