 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
F100 crew had less than desired spacing with a VFR target at 12500 ft. That was not detected on ATC radar.
| Attributes | |
| ACN | 520802 |
| Time | |
| Date | 200108 |
| Day | Tue |
| Aircraft 1 | |
| Controlling Facilities | tracon : d10.tracon tower : mia.tower |
| Operator | common carrier : air carrier |
| Make Model Name | Fokker 100 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : d10.tracon |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| ASRS Report | 520802 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne critical other anomaly other |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : took evasive action none taken : detected after the fact other |
| Consequence | other |
| Miss Distance | vertical : 500 |
| Supplementary | |
| Problem Areas | Airspace Structure FAA ATC Facility |
| Primary Problem | ATC Facility |
| Air Traffic Incident | other |
| Situations | |
| ATC Facility | radar equipment : d10.tracon |
Narrative:
TCASII RA. Descending through 13000 ft on the cedar creek arrival, we received a TCASII RA for a target that was displayed as 500 ft below us at the 1 O'clock position. The TCASII commanded a climb. The autoplt was disconnected and a climb was commenced. The captain notified approach that we were climbing as a result of the RA. Approach responded that there were no aircraft in our area except a target on the surface below us. Once the resolution was over, I continued descent to 11000 ft. About 2 mins later, approach told that we had been correct and that he was now painting a VFR aircraft that would have been 500 ft below us when we took action. Although we were VFR, it was hazy with visibility less than 10 mi. I think the TCASII saved us from a possible collision with the other aircraft. TCASII is a great safety system.
Original NASA ASRS Text
Title: F100 CREW HAD LESS THAN DESIRED SPACING WITH A VFR TARGET AT 12500 FT. THAT WAS NOT DETECTED ON ATC RADAR.
Narrative: TCASII RA. DSNDING THROUGH 13000 FT ON THE CEDAR CREEK ARR, WE RECEIVED A TCASII RA FOR A TARGET THAT WAS DISPLAYED AS 500 FT BELOW US AT THE 1 O'CLOCK POS. THE TCASII COMMANDED A CLB. THE AUTOPLT WAS DISCONNECTED AND A CLB WAS COMMENCED. THE CAPT NOTIFIED APCH THAT WE WERE CLBING AS A RESULT OF THE RA. APCH RESPONDED THAT THERE WERE NO ACFT IN OUR AREA EXCEPT A TARGET ON THE SURFACE BELOW US. ONCE THE RESOLUTION WAS OVER, I CONTINUED DSCNT TO 11000 FT. ABOUT 2 MINS LATER, APCH TOLD THAT WE HAD BEEN CORRECT AND THAT HE WAS NOW PAINTING A VFR ACFT THAT WOULD HAVE BEEN 500 FT BELOW US WHEN WE TOOK ACTION. ALTHOUGH WE WERE VFR, IT WAS HAZY WITH VISIBILITY LESS THAN 10 MI. I THINK THE TCASII SAVED US FROM A POSSIBLE COLLISION WITH THE OTHER ACFT. TCASII IS A GREAT SAFETY SYS.
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.