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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Controller misjudged distance between aircraft and climbs air carrier through altitude of another air carrier resulting in less than standard separation.
| Attributes | |
| ACN | 200256 |
| Time | |
| Date | 199201 |
| Day | Fri |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | atc facility : swl |
| State Reference | MD |
| Altitude | msl bound lower : 32500 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : developmental |
| Experience | controller non radar : 1 controller radar : 1 |
| ASRS Report | 200256 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| ASRS Report | 200255 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 14100 vertical : 1800 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X was climbing to FL350. Air carrier Y was level FL330. As air carrier X climbed through FL340 his climb slowed. Air carrier Y was turned and then later cleared to FL310 to provide separation. Air carrier Y was 200 mi south of air carrier X when air carrier X's clearance was changed from FL310 to FL350 and air carrier Y was deemed to be no factor. Supplemental information from acn 200255. Air carrier X was climbing sbound to FL350. At FL340 he slowed his rate of climb to aircraft limitations and WX. This brought air carrier Y into conflict at FL330. A turn was issued to air carrier Y and then descent to FL310. A report out of FL325 was requested and received from air carrier Y. This was intended to give us vertical separation but we only had 1800 ft according to the computer readout. At the time of the occurrence I felt I had separation.
Original NASA ASRS Text
Title: CTLR MISJUDGED DISTANCE BTWN ACFT AND CLBS ACR THROUGH ALT OF ANOTHER ACR RESULTING IN LTSS.
Narrative: ACR X WAS CLBING TO FL350. ACR Y WAS LEVEL FL330. AS ACR X CLBED THROUGH FL340 HIS CLB SLOWED. ACR Y WAS TURNED AND THEN LATER CLRED TO FL310 TO PROVIDE SEPARATION. ACR Y WAS 200 MI S OF ACR X WHEN ACR X'S CLRNC WAS CHANGED FROM FL310 TO FL350 AND ACR Y WAS DEEMED TO BE NO FACTOR. SUPPLEMENTAL INFO FROM ACN 200255. ACR X WAS CLBING SBOUND TO FL350. AT FL340 HE SLOWED HIS RATE OF CLB TO ACFT LIMITATIONS AND WX. THIS BROUGHT ACR Y INTO CONFLICT AT FL330. A TURN WAS ISSUED TO ACR Y AND THEN DSCNT TO FL310. A RPT OUT OF FL325 WAS REQUESTED AND RECEIVED FROM ACR Y. THIS WAS INTENDED TO GIVE US VERT SEPARATION BUT WE ONLY HAD 1800 FT ACCORDING TO THE COMPUTER READOUT. AT THE TIME OF THE OCCURRENCE I FELT I HAD SEPARATION.
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.