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Medium large transport aircraft after takeoff received TCASII TA on traffic at the 12 O'clock position and 2000 ft. Their clearance was to 3000 ft, but they leveled at 1500 ft until clear of traffic. When changing to departure controller he assured the flight crew that the traffic was possibly under tower control.
| Attributes | |
| ACN | 352751 |
| Time | |
| Date | 199611 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : abe |
| State Reference | PA |
| Altitude | msl bound lower : 1500 msl bound upper : 1500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : abe tower : boi |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unknown |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 8000 flight time type : 4000 |
| ASRS Report | 352751 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 100 flight time total : 12000 flight time type : 7000 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : far other anomaly other other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Pilot Deviation other |
Narrative:
Shortly after takeoff at abe with clearance to climb to 3000 ft MSL we received a TCASII warning and observed TCASII traffic at 12 O'clock depicted at 2000 ft. We leveled at 1500 ft, searched for traffic which we never saw, then continued climb after conflict resolved. The alert sounded after tower had switched us to departure control, who stated he hadn't observed traffic and assured us it was under 'tower's control.' it appears that the traffic was uncontrolled and encroached on the airspace without letting anyone know. All ground system missed him, and a near miss or worse could have resulted had TCASII not alerted us to discontinue climb.
Original NASA ASRS Text
Title: MLG ACFT AFTER TKOF RECEIVED TCASII TA ON TFC AT THE 12 O'CLOCK POS AND 2000 FT. THEIR CLRNC WAS TO 3000 FT, BUT THEY LEVELED AT 1500 FT UNTIL CLR OF TFC. WHEN CHANGING TO DEP CTLR HE ASSURED THE FLC THAT THE TFC WAS POSSIBLY UNDER TWR CTL.
Narrative: SHORTLY AFTER TKOF AT ABE WITH CLRNC TO CLB TO 3000 FT MSL WE RECEIVED A TCASII WARNING AND OBSERVED TCASII TFC AT 12 O'CLOCK DEPICTED AT 2000 FT. WE LEVELED AT 1500 FT, SEARCHED FOR TFC WHICH WE NEVER SAW, THEN CONTINUED CLB AFTER CONFLICT RESOLVED. THE ALERT SOUNDED AFTER TWR HAD SWITCHED US TO DEP CTL, WHO STATED HE HADN'T OBSERVED TFC AND ASSURED US IT WAS UNDER 'TWR'S CTL.' IT APPEARS THAT THE TFC WAS UNCTLED AND ENCROACHED ON THE AIRSPACE WITHOUT LETTING ANYONE KNOW. ALL GND SYS MISSED HIM, AND A NEAR MISS OR WORSE COULD HAVE RESULTED HAD TCASII NOT ALERTED US TO DISCONTINUE CLB.
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.