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TCASII RA creates need for evasive action descent. An altitude deviation altitude excursion, speed deviation occurs as a result.
| Attributes | |
| ACN | 318670 |
| Time | |
| Date | 199510 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : ord |
| State Reference | IL |
| Altitude | msl bound lower : 9200 msl bound upper : 10000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tracon : ord |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Route In Use | enroute other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | other : unknown |
| Flight Phase | cruise other |
| Route In Use | enroute other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : commercial pilot : cfi pilot : atp pilot : instrument |
| Experience | flight time last 90 days : 112 flight time total : 9800 flight time type : 112 |
| ASRS Report | 318670 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 50 flight time total : 10500 flight time type : 300 |
| ASRS Report | 318683 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : published procedure non adherence : required legal separation other anomaly |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action |
| Consequence | other |
| Supplementary | |
| Primary Problem | Ambiguous |
| Air Traffic Incident | Pilot Deviation |
Narrative:
10000 ft at 300 KIAS assigned, direct to ord, received an RA on TCASII. No TA given before. Command 'descend, descend' given, followed immediately by 'descend, descend now.' RA was at 12 O'clock position, 10000 ft, estimate less than 5 mi. Disconnected autoplt and initiated 1500 ft to 2000 ft vertical speed descent. Leveled off at 9200 ft and slowed to 250 KIAS. Advised ATC and reclred to 8000 ft MSL. No visual contact ever on aircraft and no injuries from maneuver but a few anxious passenger. Supplemental information from acn 318683: 5 mi southwest of pappi intersection, the first officer was flying using the autoplt. I told him to 'do whatever TCASII said.' the first officer took over manually and started a positive descent. Both cabin signs were on, the flight attendants were still up. The flight attendants in the rear galley were lifted off their feet by the sudden descent. No injuries.
Original NASA ASRS Text
Title: TCASII RA CREATES NEED FOR EVASIVE ACTION DSCNT. AN ALTDEV ALT EXCURSION, SPD DEV OCCURS AS A RESULT.
Narrative: 10000 FT AT 300 KIAS ASSIGNED, DIRECT TO ORD, RECEIVED AN RA ON TCASII. NO TA GIVEN BEFORE. COMMAND 'DSND, DSND' GIVEN, FOLLOWED IMMEDIATELY BY 'DSND, DSND NOW.' RA WAS AT 12 O'CLOCK POS, 10000 FT, ESTIMATE LESS THAN 5 MI. DISCONNECTED AUTOPLT AND INITIATED 1500 FT TO 2000 FT VERT SPD DSCNT. LEVELED OFF AT 9200 FT AND SLOWED TO 250 KIAS. ADVISED ATC AND RECLRED TO 8000 FT MSL. NO VISUAL CONTACT EVER ON ACFT AND NO INJURIES FROM MANEUVER BUT A FEW ANXIOUS PAX. SUPPLEMENTAL INFO FROM ACN 318683: 5 MI SW OF PAPPI INTXN, THE FO WAS FLYING USING THE AUTOPLT. I TOLD HIM TO 'DO WHATEVER TCASII SAID.' THE FO TOOK OVER MANUALLY AND STARTED A POSITIVE DSCNT. BOTH CABIN SIGNS WERE ON, THE FLT ATTENDANTS WERE STILL UP. THE FLT ATTENDANTS IN THE REAR GALLEY WERE LIFTED OFF THEIR FEET BY THE SUDDEN DSCNT. NO INJURIES.
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.