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An air carrier flight crew responded to a controller's request to stop their descent. An F18 came within 1 mi horizontally and 500 ft vertically of the reporting flight crew's aircraft.
| Attributes | |
| ACN | 325957 |
| Time | |
| Date | 199512 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : hyp |
| State Reference | CA |
| Altitude | msl bound lower : 12600 msl bound upper : 12600 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | arrival other arrival star : star enroute airway : zoa |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | other |
| Make Model Name | Fighter |
| Operating Under FAR Part | other : other |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : commercial |
| Experience | flight time last 90 days : 99 flight time total : 13500 flight time type : 3400 |
| ASRS Report | 325957 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : cfi pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 150 flight time total : 5900 flight time type : 700 |
| ASRS Report | 325956 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 6000 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
While inbound to sjc on hyp.HYP3 arrival, ATC cleared us to cross papee intersection at or below 13000 ft (normally 16000 ft). We were then cleared to 11000 ft. As we were descending through 12600 ft, we were told to stop our descent at 13000 ft due to the F18 traffic, 3 O'clock, 2 mi, and sbound at 12000 ft! We weren't able to arrest the descent and start our climb until 12500 ft. The PNF informed ATC that we were already descending through 12600 ft, but that we would climb back up to 13000 ft. This exchange occurred again, as we bottomed out at 12500 ft and began our climb. We notified ATC when level at 13000 ft, at which time he cleared us back down to 11000 ft and thanked us for our help.
Original NASA ASRS Text
Title: AN ACR FLC RESPONDED TO A CTLR'S REQUEST TO STOP THEIR DSCNT. AN F18 CAME WITHIN 1 MI HORIZLY AND 500 FT VERTLY OF THE RPTING FLC'S ACFT.
Narrative: WHILE INBOUND TO SJC ON HYP.HYP3 ARR, ATC CLRED US TO CROSS PAPEE INTXN AT OR BELOW 13000 FT (NORMALLY 16000 FT). WE WERE THEN CLRED TO 11000 FT. AS WE WERE DSNDING THROUGH 12600 FT, WE WERE TOLD TO STOP OUR DSCNT AT 13000 FT DUE TO THE F18 TFC, 3 O'CLOCK, 2 MI, AND SBOUND AT 12000 FT! WE WEREN'T ABLE TO ARREST THE DSCNT AND START OUR CLB UNTIL 12500 FT. THE PNF INFORMED ATC THAT WE WERE ALREADY DSNDING THROUGH 12600 FT, BUT THAT WE WOULD CLB BACK UP TO 13000 FT. THIS EXCHANGE OCCURRED AGAIN, AS WE BOTTOMED OUT AT 12500 FT AND BEGAN OUR CLB. WE NOTIFIED ATC WHEN LEVEL AT 13000 FT, AT WHICH TIME HE CLRED US BACK DOWN TO 11000 FT AND THANKED US FOR OUR HELP.
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.