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Flight crew of a DHC8-200 climbed in response to a TCASII RA during vector to final. Reporter just above the floor of class B airspace and the other aircraft was just below over a GA airport.
| Attributes | |
| ACN | 452416 |
| Time | |
| Date | 199910 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : pxr.vortac |
| State Reference | AZ |
| Altitude | msl bound lower : 4300 msl bound upper : 4700 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : p50.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Dash 8-200 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | ils localizer only : 26r other vortac |
| Flight Phase | descent : intermediate altitude |
| Route In Use | approach : instrument non precision arrival : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Bonanza 35 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise : level |
| Flight Plan | None |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 7000 flight time type : 1000 |
| ASRS Report | 452416 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : multi engine pilot : instrument |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment : tcas |
| Resolutory Action | controller : issued advisory flight crew : took precautionary avoidance action |
| Consequence | Other |
| Miss Distance | horizontal : 1000 vertical : 400 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
Narrative:
Phx approach vectored us to downwind runway 26R at 5000 ft, then right turn 170 degrees, descend to 4000 ft MSL, which brought us over ffz. First officer maintained a slow descent, knowing the floor of class B was 4000 ft. From over ffz a 230 degree heading assigned to intercept runway 26R localizer. At intercept, as wings were leveled, 4300 ft, TCASII commanded climb, followed by phx notification of traffic 3 O'clock position, 3900 ft. In the climb to a maximum of 4700 ft, traffic was sighted. The sebound bonanza appeared to be at 3900 ft, just below class B airspace. I was not aware that we were assigned an altitude at the base of class B. I will maintain 500 ft from now on. TCASII volume made cockpit and radio communications impossible at a critical time.
Original NASA ASRS Text
Title: FLC OF A DHC8-200 CLBED IN RESPONSE TO A TCASII RA DURING VECTOR TO FINAL. RPTR JUST ABOVE THE FLOOR OF CLASS B AIRSPACE AND THE OTHER ACFT WAS JUST BELOW OVER A GA ARPT.
Narrative: PHX APCH VECTORED US TO DOWNWIND RWY 26R AT 5000 FT, THEN R TURN 170 DEGS, DSND TO 4000 FT MSL, WHICH BROUGHT US OVER FFZ. FO MAINTAINED A SLOW DSCNT, KNOWING THE FLOOR OF CLASS B WAS 4000 FT. FROM OVER FFZ A 230 DEG HDG ASSIGNED TO INTERCEPT RWY 26R LOC. AT INTERCEPT, AS WINGS WERE LEVELED, 4300 FT, TCASII COMMANDED CLB, FOLLOWED BY PHX NOTIFICATION OF TFC 3 O'CLOCK POS, 3900 FT. IN THE CLB TO A MAX OF 4700 FT, TFC WAS SIGHTED. THE SEBOUND BONANZA APPEARED TO BE AT 3900 FT, JUST BELOW CLASS B AIRSPACE. I WAS NOT AWARE THAT WE WERE ASSIGNED AN ALT AT THE BASE OF CLASS B. I WILL MAINTAIN 500 FT FROM NOW ON. TCASII VOLUME MADE COCKPIT AND RADIO COMS IMPOSSIBLE AT A CRITICAL TIME.
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.