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Potential conflict ensues when 2 military fgt's lock weapons tracking system on to air carrier medium large transport. Fgt's leave assigned altitude in altitude deviation altitude excursion.
| Attributes | |
| ACN | 188363 |
| Time | |
| Date | 199108 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : rdu |
| State Reference | NC |
| Altitude | msl bound lower : 24000 msl bound upper : 25000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc artcc : zny |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Aircraft 2 | |
| Operator | other |
| Make Model Name | Fighter |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 8000 flight time type : 2000 |
| ASRS Report | 188363 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 188364 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : required legal separation non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 9000 vertical : 400 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
While level at FL250, awaiting higher, center issued routine TA at 2-3 O'clock, FL260, about 5 mi, 2 military fgt's. Shortly thereafter, our TCASII issued a TA, concurrent with a yellow caution display on the radar of the targets off our right. At this same time, center called and asked if we had a visual on the fgt's at which time we saw them off our right coming towards us. This was immediately followed by a TCASII descend command at which time the radar displayed the fgt's as only 400 ft above us with range less than 3 mi. We advised center that we were descending from FL250 and were immediately given clearance to FL240. Subsequent telephone conversation with washington ARTCC revealed that the fgt's apparently were using us for a practice 'lock-on' of their weapons system and somehow left their assigned altitude.
Original NASA ASRS Text
Title: POTENTIAL CONFLICT ENSUES WHEN 2 MIL FGT'S LOCK WEAPONS TRACKING SYS ON TO ACR MLG. FGT'S LEAVE ASSIGNED ALT IN ALTDEV ALT EXCURSION.
Narrative: WHILE LEVEL AT FL250, AWAITING HIGHER, CENTER ISSUED ROUTINE TA AT 2-3 O'CLOCK, FL260, ABOUT 5 MI, 2 MIL FGT'S. SHORTLY THEREAFTER, OUR TCASII ISSUED A TA, CONCURRENT WITH A YELLOW CAUTION DISPLAY ON THE RADAR OF THE TARGETS OFF OUR R. AT THIS SAME TIME, CENTER CALLED AND ASKED IF WE HAD A VISUAL ON THE FGT'S AT WHICH TIME WE SAW THEM OFF OUR R COMING TOWARDS US. THIS WAS IMMEDIATELY FOLLOWED BY A TCASII DSND COMMAND AT WHICH TIME THE RADAR DISPLAYED THE FGT'S AS ONLY 400 FT ABOVE US WITH RANGE LESS THAN 3 MI. WE ADVISED CENTER THAT WE WERE DSNDING FROM FL250 AND WERE IMMEDIATELY GIVEN CLRNC TO FL240. SUBSEQUENT TELEPHONE CONVERSATION WITH WASHINGTON ARTCC REVEALED THAT THE FGT'S APPARENTLY WERE USING US FOR A PRACTICE 'LOCK-ON' OF THEIR WEAPONS SYS AND SOMEHOW LEFT THEIR ASSIGNED ALT.
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.