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Air carrier DC9 is issued a rapid descent and turn through an occupied altitude. The DC9 flight crew receive a TCASII RA to climb and comply with instructions. Upon leveling off and starting a descent again, the DC9 received another TCASII RA to climb. Both RA's appeared to be caused by 2 different air carrier's who also were reacting to TCASII RA's.
| Attributes | |
| ACN | 358796 |
| Time | |
| Date | 199701 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : air |
| State Reference | OH |
| Altitude | msl bound lower : 29000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 24000 flight time type : 9000 |
| ASRS Report | 358796 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 6700 flight time type : 1000 |
| ASRS Report | 358797 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : required legal separation non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action other |
| Consequence | Other |
| Miss Distance | horizontal : 15000 vertical : 700 |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Sbound on air 160 degree radial 70 mi south at FL330, asked by ATC to turn 15 degrees left and expedite to FL290. Started a turn and 2000 FPM descent to assigned altitude. At about FL310 received a TCASII RA 'climb, climb.' I started a climb, and 10 seconds later got 'monitor vertical speed.' ATC issued another turn to 090 degrees. Started the turn with descent and received another TCASII RA 'climb, climb.' I started another climb to receive a 'monitor vertical speed.' the first RA was from an air carrier (Z) flight and the second was from another air carrier (a) flight as both flts responded similar RA's in opposite directions. This incident was brought on by a air carrier Y, a 'lifeguard' flight that was also flying to richmond, and probably caused the controller on 133.07 to leave us high and caused the conflict during our descent. Supplemental information from acn 358797: a 'lifeguard' checked on frequency. An effort was made by ATC to expedite the lifeguard en route to ric.
Original NASA ASRS Text
Title: ACR DC9 IS ISSUED A RAPID DSCNT AND TURN THROUGH AN OCCUPIED ALT. THE DC9 FLC RECEIVE A TCASII RA TO CLB AND COMPLY WITH INSTRUCTIONS. UPON LEVELING OFF AND STARTING A DSCNT AGAIN, THE DC9 RECEIVED ANOTHER TCASII RA TO CLB. BOTH RA'S APPEARED TO BE CAUSED BY 2 DIFFERENT ACR'S WHO ALSO WERE REACTING TO TCASII RA'S.
Narrative: SBOUND ON AIR 160 DEG RADIAL 70 MI S AT FL330, ASKED BY ATC TO TURN 15 DEGS L AND EXPEDITE TO FL290. STARTED A TURN AND 2000 FPM DSCNT TO ASSIGNED ALT. AT ABOUT FL310 RECEIVED A TCASII RA 'CLB, CLB.' I STARTED A CLB, AND 10 SECONDS LATER GOT 'MONITOR VERT SPD.' ATC ISSUED ANOTHER TURN TO 090 DEGS. STARTED THE TURN WITH DSCNT AND RECEIVED ANOTHER TCASII RA 'CLB, CLB.' I STARTED ANOTHER CLB TO RECEIVE A 'MONITOR VERT SPD.' THE FIRST RA WAS FROM AN ACR (Z) FLT AND THE SECOND WAS FROM ANOTHER ACR (A) FLT AS BOTH FLTS RESPONDED SIMILAR RA'S IN OPPOSITE DIRECTIONS. THIS INCIDENT WAS BROUGHT ON BY A ACR Y, A 'LIFEGUARD' FLT THAT WAS ALSO FLYING TO RICHMOND, AND PROBABLY CAUSED THE CTLR ON 133.07 TO LEAVE US HIGH AND CAUSED THE CONFLICT DURING OUR DSCNT. SUPPLEMENTAL INFO FROM ACN 358797: A 'LIFEGUARD' CHKED ON FREQ. AN EFFORT WAS MADE BY ATC TO EXPEDITE THE LIFEGUARD ENRTE TO RIC.
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.