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Flight crew of an large transport air carrier aircraft stopped descent early and leveled off before assigned descent altitude in response to a TCASII RA. Altitude undershoot.
| Attributes | |
| ACN | 253125 |
| Time | |
| Date | 199310 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : phx |
| State Reference | AZ |
| Altitude | msl bound lower : 11000 msl bound upper : 11350 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | descent other |
| Route In Use | enroute airway : phx |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Small Aircraft, High Wing, 1 Eng, Fixed Gear |
| Flight Phase | cruise other |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 83 flight time total : 11907 |
| ASRS Report | 253125 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | altitude deviation : undershoot conflict : airborne less severe non adherence : clearance other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 850 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
While descending to assigned altitude of 11000 ft, our TCASII issued a TA for traffic at 12:30 O'clock followed shortly by an RA 'decrease rate of descent' which we complied with. We also told phx approach control that we were leveling above 11000 ft due to the TCASII RA. The controller seemed to want us to level at 11000 prior to the conflict with the VFR traffic at 10500 MSL!
Original NASA ASRS Text
Title: FLC OF AN LGT ACR ACFT STOPPED DSCNT EARLY AND LEVELED OFF BEFORE ASSIGNED DSCNT ALT IN RESPONSE TO A TCASII RA. ALT UNDERSHOOT.
Narrative: WHILE DSNDING TO ASSIGNED ALT OF 11000 FT, OUR TCASII ISSUED A TA FOR TFC AT 12:30 O'CLOCK FOLLOWED SHORTLY BY AN RA 'DECREASE RATE OF DSCNT' WHICH WE COMPLIED WITH. WE ALSO TOLD PHX APCH CTL THAT WE WERE LEVELING ABOVE 11000 FT DUE TO THE TCASII RA. THE CTLR SEEMED TO WANT US TO LEVEL AT 11000 PRIOR TO THE CONFLICT WITH THE VFR TFC AT 10500 MSL!
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.