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Loss of lateral vertical separation between an air carrier B737 approaching FL230 in a climb to FL270 and another air carrier at FL230.
| Attributes | |
| ACN | 383254 |
| Time | |
| Date | 199710 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : gve |
| State Reference | VA |
| Altitude | msl bound lower : 23000 msl bound upper : 23500 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc tower : zzz |
| Operator | common carrier : air carrier |
| Make Model Name | B737-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude cruise other |
| Route In Use | enroute : on vectors |
| 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 |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 12000 flight time type : 9000 |
| ASRS Report | 383254 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action other |
| Consequence | Other |
| Miss Distance | horizontal : 18000 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
We were climbing to cleared altitude of FL270. Approaching FL230, we were given an immediate left 30 degree turn for traffic. Next an air carrier aircraft was also given a 30 degree left turn for traffic. As we began our turn we received a 'climb crossing climb' RA from our TCASII. The vsi commanded a climb increase to approximately 1800 FPM. The first officer visually spotted 'intruder' aircraft and verified distance of approximately 3 NM at cpa, as indicated on TCASII display. Our altitude at cpa was approximately 23500 ft (approximately 500 ft above other aircraft). I felt that ATC should have recognized conflict earlier and was glad to have TCASII equipment on board.
Original NASA ASRS Text
Title: LOSS OF LATERAL VERT SEPARATION BTWN AN ACR B737 APCHING FL230 IN A CLB TO FL270 AND ANOTHER ACR AT FL230.
Narrative: WE WERE CLBING TO CLRED ALT OF FL270. APCHING FL230, WE WERE GIVEN AN IMMEDIATE L 30 DEG TURN FOR TFC. NEXT AN ACR ACFT WAS ALSO GIVEN A 30 DEG L TURN FOR TFC. AS WE BEGAN OUR TURN WE RECEIVED A 'CLB XING CLB' RA FROM OUR TCASII. THE VSI COMMANDED A CLB INCREASE TO APPROX 1800 FPM. THE FO VISUALLY SPOTTED 'INTRUDER' ACFT AND VERIFIED DISTANCE OF APPROX 3 NM AT CPA, AS INDICATED ON TCASII DISPLAY. OUR ALT AT CPA WAS APPROX 23500 FT (APPROX 500 FT ABOVE OTHER ACFT). I FELT THAT ATC SHOULD HAVE RECOGNIZED CONFLICT EARLIER AND WAS GLAD TO HAVE TCASII EQUIP ON BOARD.
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.