 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Amended clearance altitude change places air carrier medium large transport within 4 mi and 900 ft of a crossing air carrier aircraft. Controller realizes error and issues climb turn instructions to air carrier X and descent turn to air carrier Y.
| Attributes | |
| ACN | 365040 |
| Time | |
| Date | 199703 |
| Day | Mon |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : jan |
| State Reference | MS |
| Altitude | msl bound lower : 31900 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zme |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other descent other |
| Route In Use | enroute other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| 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 : atp |
| Experience | flight time last 90 days : 60 flight time total : 2400 flight time type : 60 |
| ASRS Report | 365040 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 160 flight time total : 14000 flight time type : 160 |
| ASRS Report | 364933 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure 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 : 24000 vertical : 900 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Heading sbound (180 degrees) toward jan. Cleared by ZME to descend out of cruise altitude (FL330) down to FL240. Acknowledged and began descent. Approaching FL320, ZME gave command to immediately climb to FL330 followed by a command to turn 90 degrees right. TCASII showed another aircraft 900 ft below our altitude of FL320 and about 4 NM off our left wing. Visual of this aircraft showed him heading about 270 degrees. We immediately climbed back to FL330 and turned right. Following this maneuver, ZME cleared us back toward jan at FL330. When we queried him about lower altitude he said to expect descent to FL240 in about 1 min for traffic below us.
Original NASA ASRS Text
Title: AMENDED CLRNC ALT CHANGE PLACES ACR MLG WITHIN 4 MI AND 900 FT OF A XING ACR ACFT. CTLR REALIZES ERROR AND ISSUES CLB TURN INSTRUCTIONS TO ACR X AND DSCNT TURN TO ACR Y.
Narrative: HDG SBOUND (180 DEGS) TOWARD JAN. CLRED BY ZME TO DSND OUT OF CRUISE ALT (FL330) DOWN TO FL240. ACKNOWLEDGED AND BEGAN DSCNT. APCHING FL320, ZME GAVE COMMAND TO IMMEDIATELY CLB TO FL330 FOLLOWED BY A COMMAND TO TURN 90 DEGS R. TCASII SHOWED ANOTHER ACFT 900 FT BELOW OUR ALT OF FL320 AND ABOUT 4 NM OFF OUR L WING. VISUAL OF THIS ACFT SHOWED HIM HDG ABOUT 270 DEGS. WE IMMEDIATELY CLBED BACK TO FL330 AND TURNED R. FOLLOWING THIS MANEUVER, ZME CLRED US BACK TOWARD JAN AT FL330. WHEN WE QUERIED HIM ABOUT LOWER ALT HE SAID TO EXPECT DSCNT TO FL240 IN ABOUT 1 MIN FOR TFC BELOW US.
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.