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An md-S80 crew reported receiving a TCASII RA after complying with a request from a C90 TRACON controller to maintain best rate up to 10000 ft. Reviewing the RA with the controller revealed his perception that he thought an md-S80 could out run a B737.
| Attributes | |
| ACN | 459920 |
| Time | |
| Date | 200001 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : ord.vor |
| State Reference | IL |
| Altitude | msl bound lower : 9000 msl bound upper : 10000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : c90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Super 80 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | climbout : initial climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : c90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : instrument pilot : commercial |
| ASRS Report | 459920 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 459919 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation other anomaly other |
| Independent Detector | aircraft equipment : tcas other flight crewa other flight crewb |
| Resolutory Action | flight crew : took evasive action |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 7500 vertical : 2500 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
Narrative:
Departure controller assigned best rate to 10000 ft -- 320 KTS at 10000 ft. As captain accelerated, we received RA to climb 2000 FPM due to traffic at our 9 O'clock position. Traffic closed to approximately 1.25 mi before passing behind us, 2500 ft below. Originally showed altitude difference of approximately 1500 ft. Advised departure controller of deviation from plan -- rest normal. Controller stated he thought our speed increase would separate us from B737 departure from midway. Good plan, but a little too ambitious. Following RA resulted in adequate separation and safety. Without it, separation would've been interesting.
Original NASA ASRS Text
Title: AN MD-S80 CREW RPTED RECEIVING A TCASII RA AFTER COMPLYING WITH A REQUEST FROM A C90 TRACON CTLR TO MAINTAIN BEST RATE UP TO 10000 FT. REVIEWING THE RA WITH THE CTLR REVEALED HIS PERCEPTION THAT HE THOUGHT AN MD-S80 COULD OUT RUN A B737.
Narrative: DEP CTLR ASSIGNED BEST RATE TO 10000 FT -- 320 KTS AT 10000 FT. AS CAPT ACCELERATED, WE RECEIVED RA TO CLB 2000 FPM DUE TO TFC AT OUR 9 O'CLOCK POS. TFC CLOSED TO APPROX 1.25 MI BEFORE PASSING BEHIND US, 2500 FT BELOW. ORIGINALLY SHOWED ALT DIFFERENCE OF APPROX 1500 FT. ADVISED DEP CTLR OF DEV FROM PLAN -- REST NORMAL. CTLR STATED HE THOUGHT OUR SPD INCREASE WOULD SEPARATE US FROM B737 DEP FROM MIDWAY. GOOD PLAN, BUT A LITTLE TOO AMBITIOUS. FOLLOWING RA RESULTED IN ADEQUATE SEPARATION AND SAFETY. WITHOUT IT, SEPARATION WOULD'VE BEEN INTERESTING.
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.