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TCASII parameters triggered by high climb rate of intruding aircraft. Evasive action initiated. No near midair collision.
| Attributes | |
| ACN | 292927 |
| Time | |
| Date | 199501 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : mod |
| State Reference | CA |
| Altitude | msl bound lower : 28000 msl bound upper : 28400 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Route In Use | enroute airway : zoa |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unknown |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 10400 flight time type : 500 |
| ASRS Report | 292927 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | aircraft : equipment problem dissipated flight crew : took evasive action flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
In level flight at FL280, received TCASII RA for intruding aircraft. TCASII commanded a climb. I left my assigned altitude and followed the TCASII RA for 400 ft climb to FL284. Conflict was caused by an aircraft climbing below me to FL270. His high rate of climb created the RA. The TCASII system has no way of knowing that the intruder aircraft is assigned FL270 or is planning on a leveloff. This type of conflict (TCASII conflict) is not uncommon. After climbing out of my assigned altitude I advised ATC and returned to FL280 after the RA was resolved. ATC should avoid, if possible. Climbing 1 aircraft directly into the flight path of another with only 1000 ft clearance.
Original NASA ASRS Text
Title: TCASII PARAMETERS TRIGGERED BY HIGH CLB RATE OF INTRUDING ACFT. EVASIVE ACTION INITIATED. NO NMAC.
Narrative: IN LEVEL FLT AT FL280, RECEIVED TCASII RA FOR INTRUDING ACFT. TCASII COMMANDED A CLB. I LEFT MY ASSIGNED ALT AND FOLLOWED THE TCASII RA FOR 400 FT CLB TO FL284. CONFLICT WAS CAUSED BY AN ACFT CLBING BELOW ME TO FL270. HIS HIGH RATE OF CLB CREATED THE RA. THE TCASII SYS HAS NO WAY OF KNOWING THAT THE INTRUDER ACFT IS ASSIGNED FL270 OR IS PLANNING ON A LEVELOFF. THIS TYPE OF CONFLICT (TCASII CONFLICT) IS NOT UNCOMMON. AFTER CLBING OUT OF MY ASSIGNED ALT I ADVISED ATC AND RETURNED TO FL280 AFTER THE RA WAS RESOLVED. ATC SHOULD AVOID, IF POSSIBLE. CLBING 1 ACFT DIRECTLY INTO THE FLT PATH OF ANOTHER WITH ONLY 1000 FT CLRNC.
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.