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On descent to FL220, B717 initiates a TCASII climb due to fast climbing jet traffic restr to FL210. ZHU controller does not like TCASII procedure.
| Attributes | |
| ACN | 512993 |
| Time | |
| Date | 200105 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : gcv.vortac |
| State Reference | MS |
| Altitude | msl bound lower : 22500 msl bound upper : 23000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zhu.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B717 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : vacating altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zhu.artcc |
| 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 |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 250 flight time total : 7500 flight time type : 1000 |
| ASRS Report | 512993 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | altitude deviation : undershoot conflict : airborne critical non adherence : clearance |
| Independent Detector | atc equipment other atc equipment : radar aircraft equipment : tcas other flight crewa |
| Resolutory Action | controller : issued advisory flight crew : returned to assigned altitude flight crew : took evasive action |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | vertical : 1000 |
| Supplementary | |
| Problem Areas | ATC Human Performance Aircraft |
| Primary Problem | ATC Human Performance |
| Situations | |
| ATC Facility | procedure or policy : zhu.artcc |
Narrative:
During initial descent into msy, we were cleared to descend to FL220. At approximately FL225 we got a TCASII TA, followed by an RA with a climb command. TCASII showed another aircraft climbing beneath us at greater than 1500 FPM. We initiated a climb back to FL230 until clear of conflict. After climb, we advised ATC of situation and that we could not ignore a climb command from a TCASII RA. ATC controller seemed frustrated and mildly upset -- almost as though he expected me to ignore the RA, because other aircraft had been cleared to level at FL210. He said he understood the rules for TCASII RA's but did not like them. He was concerned that a pilot's action in response to an RA will cause a separate conflict to occur. I had no way of knowing if the other aircraft would level at assigned altitude, and will continue to adhere to TCASII RA procedures.
Original NASA ASRS Text
Title: ON DSCNT TO FL220, B717 INITIATES A TCASII CLB DUE TO FAST CLBING JET TFC RESTR TO FL210. ZHU CTLR DOES NOT LIKE TCASII PROC.
Narrative: DURING INITIAL DSCNT INTO MSY, WE WERE CLRED TO DSND TO FL220. AT APPROX FL225 WE GOT A TCASII TA, FOLLOWED BY AN RA WITH A CLB COMMAND. TCASII SHOWED ANOTHER ACFT CLBING BENEATH US AT GREATER THAN 1500 FPM. WE INITIATED A CLB BACK TO FL230 UNTIL CLR OF CONFLICT. AFTER CLB, WE ADVISED ATC OF SIT AND THAT WE COULD NOT IGNORE A CLB COMMAND FROM A TCASII RA. ATC CTLR SEEMED FRUSTRATED AND MILDLY UPSET -- ALMOST AS THOUGH HE EXPECTED ME TO IGNORE THE RA, BECAUSE OTHER ACFT HAD BEEN CLRED TO LEVEL AT FL210. HE SAID HE UNDERSTOOD THE RULES FOR TCASII RA'S BUT DID NOT LIKE THEM. HE WAS CONCERNED THAT A PLT'S ACTION IN RESPONSE TO AN RA WILL CAUSE A SEPARATE CONFLICT TO OCCUR. I HAD NO WAY OF KNOWING IF THE OTHER ACFT WOULD LEVEL AT ASSIGNED ALT, AND WILL CONTINUE TO ADHERE TO TCASII RA PROCS.
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.