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Flight crew of an medium large transport refused clearance to a higher altitude due to TCASII traffic display.
| Attributes | |
| ACN | 299378 |
| Time | |
| Date | 199503 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : elx |
| State Reference | MI |
| Altitude | msl bound lower : 23000 msl bound upper : 25500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| Make Model Name | Citation I/SP |
| Operating Under FAR Part | other : unknown |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Super 80 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Experience | controller non radar : 6 controller radar : 5 |
| ASRS Report | 299378 |
| Person 2 | |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | non adherence : clearance other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Miss Distance | vertical : 2300 |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
C501 was climbing slowly swbound. Mode C indicated out of FL253, so I issued a climb to air carrier X, an md-80, to climb to FL250, perfectly legal. Air carrier X asked if I showed traffic. I replied 'affirmative, out of 25 1/2.' air carrier X opted to remain at FL230, 2300 ft below traffic, due to an RA. Aircraft were 100 percent separated. Yet TCASII countermanded a clearance. I view this as 1 more incident highlighting TCASII 'second-guessing' a traffic situation.
Original NASA ASRS Text
Title: FLC OF AN MLG REFUSED CLRNC TO A HIGHER ALT DUE TO TCASII TFC DISPLAY.
Narrative: C501 WAS CLBING SLOWLY SWBOUND. MODE C INDICATED OUT OF FL253, SO I ISSUED A CLB TO ACR X, AN MD-80, TO CLB TO FL250, PERFECTLY LEGAL. ACR X ASKED IF I SHOWED TFC. I REPLIED 'AFFIRMATIVE, OUT OF 25 1/2.' ACR X OPTED TO REMAIN AT FL230, 2300 FT BELOW TFC, DUE TO AN RA. ACFT WERE 100 PERCENT SEPARATED. YET TCASII COUNTERMANDED A CLRNC. I VIEW THIS AS 1 MORE INCIDENT HIGHLIGHTING TCASII 'SECOND-GUESSING' A TFC SIT.
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.