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An air carrier medium large transport climbed in response to a TCASII alert in IMC. There was no traffic.
| Attributes | |
| ACN | 226245 |
| Time | |
| Date | 199211 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : bos |
| State Reference | MA |
| Altitude | msl bound lower : 6000 msl bound upper : 6300 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : bos |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 12785 flight time type : 2785 |
| ASRS Report | 226245 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 120 flight time total : 14900 flight time type : 4700 |
| ASRS Report | 226200 |
| Events | |
| Anomaly | aircraft equipment problem : less severe 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 |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
The flight was on radar vectors by approach control at 6000 ft MSL in IMC. I was flying the aircraft using the autoplt with the altitude hold engaged. We received a TA, followed almost immediately with an RA (climb, climb, climb). The captain attempted to clear the airspace visually while I disconnected the autoplt and started the climb. The intruder was at approximately 11 O'clock, less than one mi, 300 ft below. We received a clear of conflict at about 6300 ft. We then returned to 6000 ft and advised ATC of the occurrence. ATC replied they showed no traffic. Note: above location position of intruder determined from TCASII display. We were IMC and never had visual contact.
Original NASA ASRS Text
Title: AN ACR MLG CLBED IN RESPONSE TO A TCASII ALERT IN IMC. THERE WAS NO TFC.
Narrative: THE FLT WAS ON RADAR VECTORS BY APCH CTL AT 6000 FT MSL IN IMC. I WAS FLYING THE ACFT USING THE AUTOPLT WITH THE ALT HOLD ENGAGED. WE RECEIVED A TA, FOLLOWED ALMOST IMMEDIATELY WITH AN RA (CLB, CLB, CLB). THE CAPT ATTEMPTED TO CLR THE AIRSPACE VISUALLY WHILE I DISCONNECTED THE AUTOPLT AND STARTED THE CLB. THE INTRUDER WAS AT APPROX 11 O'CLOCK, LESS THAN ONE MI, 300 FT BELOW. WE RECEIVED A CLR OF CONFLICT AT ABOUT 6300 FT. WE THEN RETURNED TO 6000 FT AND ADVISED ATC OF THE OCCURRENCE. ATC REPLIED THEY SHOWED NO TFC. NOTE: ABOVE LOCATION POS OF INTRUDER DETERMINED FROM TCASII DISPLAY. WE WERE IMC AND NEVER HAD VISUAL CONTACT.
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.