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Reported descent by an air carrier B737 at FL280 upon receiving a TCASII RA on a LR24 at FL291 as aircraft passed.
| Attributes | |
| ACN | 386640 |
| Time | |
| Date | 199711 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : gso |
| State Reference | NC |
| Altitude | msl bound lower : 28000 msl bound upper : 29100 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : corporate |
| Make Model Name | Learjet 24 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar pilot : private |
| Experience | controller radar : 28 flight time total : 300 |
| ASRS Report | 386640 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 1100 |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
B737 was en route at FL280. Descended lear to FL290 to cross over the B737. The lear leveled at FL291 well before reaching the B737. Both aircraft were issued traffic at 15 mi. Just as the lear passed directly over the B737, the B737 flight crew reported a TCASII alert and said he was descending. This has happened twice this week. Is there any chance that when the 2 aircraft pass directly overhead that the 2 mode C's scramble as they do in the ATC computer?
Original NASA ASRS Text
Title: RPTED DSCNT BY AN ACR B737 AT FL280 UPON RECEIVING A TCASII RA ON A LR24 AT FL291 AS ACFT PASSED.
Narrative: B737 WAS ENRTE AT FL280. DSNDED LEAR TO FL290 TO CROSS OVER THE B737. THE LEAR LEVELED AT FL291 WELL BEFORE REACHING THE B737. BOTH ACFT WERE ISSUED TFC AT 15 MI. JUST AS THE LEAR PASSED DIRECTLY OVER THE B737, THE B737 FLC RPTED A TCASII ALERT AND SAID HE WAS DSNDING. THIS HAS HAPPENED TWICE THIS WK. IS THERE ANY CHANCE THAT WHEN THE 2 ACFT PASS DIRECTLY OVERHEAD THAT THE 2 MODE C'S SCRAMBLE AS THEY DO IN THE ATC COMPUTER?
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.