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Air carrier mdt on SID had a TCASII alert that commanded a descent. The descent caused the mdt to miss its crossing altitude at sjc VOR. The other aircraft was not seen visually and the reporter did not state if ATC had called out the traffic.
| Attributes | |
| ACN | 206978 |
| Time | |
| Date | 199204 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : sjc |
| State Reference | CA |
| Altitude | msl bound lower : 6700 msl bound upper : 7000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zua |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | departure other departure sid : sid enroute airway : oak |
| 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 : 4000 flight time type : 850 |
| ASRS Report | 206978 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : published procedure other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 12000 vertical : 300 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Mdt departing sjc on loupe 8 SID. At about 7000 ft MSL turning right through 240 degree towards sjc VOR, TCASII said 'reduce climb.' traffic was on TCASII screen 300 ft above at 9 O'clock. TCASII immediately followed with 'descend' and showed a 200 FPM requirement. (We had been climbing at 3000 FPM.) we descended about 300 ft. We never saw traffic. We missed requirement to cross sjc at 12000 FPM. Advised ATC. No further events.
Original NASA ASRS Text
Title: ACR MDT ON SID HAD A TCASII ALERT THAT COMMANDED A DSCNT. THE DSCNT CAUSED THE MDT TO MISS ITS XING ALT AT SJC VOR. THE OTHER ACFT WAS NOT SEEN VISUALLY AND THE RPTR DID NOT STATE IF ATC HAD CALLED OUT THE TFC.
Narrative: MDT DEPARTING SJC ON LOUPE 8 SID. AT ABOUT 7000 FT MSL TURNING R THROUGH 240 DEG TOWARDS SJC VOR, TCASII SAID 'REDUCE CLB.' TFC WAS ON TCASII SCREEN 300 FT ABOVE AT 9 O'CLOCK. TCASII IMMEDIATELY FOLLOWED WITH 'DSND' AND SHOWED A 200 FPM REQUIREMENT. (WE HAD BEEN CLBING AT 3000 FPM.) WE DSNDED ABOUT 300 FT. WE NEVER SAW TFC. WE MISSED REQUIREMENT TO CROSS SJC AT 12000 FPM. ADVISED ATC. NO FURTHER EVENTS.
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.