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Approach controller reports the unnecessary altitude excursion of an medium large transport air carrier aircraft in response to TA TCASII RA which had been pointed out to the air carrier flight crew.
| Attributes | |
| ACN | 253171 |
| Time | |
| Date | 199309 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : dxo airport : dtw |
| State Reference | MI |
| Altitude | msl bound lower : 11000 msl bound upper : 12000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : dtw artcc : zhn |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Small Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller military : 8 controller radar : 12 |
| ASRS Report | 253171 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude altitude deviation : undershoot non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : took evasive action other |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 2000 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Air carrier X was inbound from mizar intersection nebound descending to 11000 from 12000, inbound to dtw. Air carrier X was an medium large transport. An small transport was outbound from dtw, nwbound climbing out of 9800 for 10000 ft. I issued traffic to air carrier X when he was descending out of 11600. At the time, small transport was at 9800. I told air carrier X that the traffic was going to level at 10000 (local departure procedure). He told me he had an RA. Air carrier X then climbed to 12000 ft and passed 2000 ft over small transport who had indeed stopped at 10000 ft. There was no loss of separation. The possibility exists, however, for aircraft in the arrival areas inbound to dtw to be at 11000 ft and 12000 ft. If that had been the case, air carrier X might have climbed into another arrival at 12000 ft. Pilots should not operate TCASII in the RA mode in busy terminal areas (class B airspace). There are too many aircraft, both IFR and VFR, being separated legally by ATC. TCASII does not recognize legal IFR/VFR or VFR/VFR class B separation minima. Especially the 500 ft vertical separation minimum.
Original NASA ASRS Text
Title: APCH CTLR RPTS THE UNNECESSARY ALT EXCURSION OF AN MLG ACR ACFT IN RESPONSE TO TA TCASII RA WHICH HAD BEEN POINTED OUT TO THE ACR FLC.
Narrative: ACR X WAS INBOUND FROM MIZAR INTXN NEBOUND DSNDING TO 11000 FROM 12000, INBOUND TO DTW. ACR X WAS AN MLG. AN SMT WAS OUTBOUND FROM DTW, NWBOUND CLBING OUT OF 9800 FOR 10000 FT. I ISSUED TFC TO ACR X WHEN HE WAS DSNDING OUT OF 11600. AT THE TIME, SMT WAS AT 9800. I TOLD ACR X THAT THE TFC WAS GOING TO LEVEL AT 10000 (LCL DEP PROC). HE TOLD ME HE HAD AN RA. ACR X THEN CLBED TO 12000 FT AND PASSED 2000 FT OVER SMT WHO HAD INDEED STOPPED AT 10000 FT. THERE WAS NO LOSS OF SEPARATION. THE POSSIBILITY EXISTS, HOWEVER, FOR ACFT IN THE ARR AREAS INBOUND TO DTW TO BE AT 11000 FT AND 12000 FT. IF THAT HAD BEEN THE CASE, ACR X MIGHT HAVE CLBED INTO ANOTHER ARR AT 12000 FT. PLTS SHOULD NOT OPERATE TCASII IN THE RA MODE IN BUSY TERMINAL AREAS (CLASS B AIRSPACE). THERE ARE TOO MANY ACFT, BOTH IFR AND VFR, BEING SEPARATED LEGALLY BY ATC. TCASII DOES NOT RECOGNIZE LEGAL IFR/VFR OR VFR/VFR CLASS B SEPARATION MINIMA. ESPECIALLY THE 500 FT VERT SEPARATION MINIMUM.
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.