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Air carrier X TCASII RA same altitude assigned had less than standard separation with small aircraft Y. System error.
| Attributes | |
| ACN | 246161 |
| Time | |
| Date | 199307 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : pom |
| State Reference | CA |
| Altitude | msl bound lower : 3000 msl bound upper : 3000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : ont artcc : zbw |
| Operator | common carrier : air carrier |
| Make Model Name | Light Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft, Low Wing, 1 Eng, Retractable Gear |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : departure |
| Qualification | controller : radar |
| Experience | controller military : 7 controller radar : 10 |
| ASRS Report | 246161 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 5400 vertical : 100 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
While working departure control, 4 of 5 aircraft were on vectors. A fast behind a slow departed ont. A fast behind a slow departed poc. The slow aircraft was direct pom VOR at 4000 ft which precluded the climb of air carrier X. In an attempt to vector air carrier X away from other conflicting traffic, air carrier X received a TCASII RA with small aircraft Y, and descended to avoid. Several factors contributed to the event: too many aircraft were released at one time in poor WX conditions. Fast aircraft were released too close behind slow aircraft. Questionable separation provided by both towers involved. Lack of communication between radar team members concerning plan of action to separate 5 aircraft. Small aircraft Y did not comply with initial departure instruction to fly heading 210 degrees on departure.
Original NASA ASRS Text
Title: ACR X TCASII RA SAME ALT ASSIGNED HAD LTSS WITH SMA Y. SYS ERROR.
Narrative: WHILE WORKING DEP CTL, 4 OF 5 ACFT WERE ON VECTORS. A FAST BEHIND A SLOW DEPARTED ONT. A FAST BEHIND A SLOW DEPARTED POC. THE SLOW ACFT WAS DIRECT POM VOR AT 4000 FT WHICH PRECLUDED THE CLB OF ACR X. IN AN ATTEMPT TO VECTOR ACR X AWAY FROM OTHER CONFLICTING TFC, ACR X RECEIVED A TCASII RA WITH SMA Y, AND DSNDED TO AVOID. SEVERAL FACTORS CONTRIBUTED TO THE EVENT: TOO MANY ACFT WERE RELEASED AT ONE TIME IN POOR WX CONDITIONS. FAST ACFT WERE RELEASED TOO CLOSE BEHIND SLOW ACFT. QUESTIONABLE SEPARATION PROVIDED BY BOTH TWRS INVOLVED. LACK OF COM BTWN RADAR TEAM MEMBERS CONCERNING PLAN OF ACTION TO SEPARATE 5 ACFT. SMA Y DID NOT COMPLY WITH INITIAL DEP INSTRUCTION TO FLY HDG 210 DEGS ON DEP.
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.