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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Air carrier Y climb to occupied altitude had less than standard separation from air carrier X. System error.
| Attributes | |
| ACN | 243352 |
| Time | |
| Date | 199306 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : gve |
| State Reference | VA |
| Altitude | msl bound lower : 28000 msl bound upper : 28000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| 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 cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | climbout : intermediate altitude cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 5 |
| ASRS Report | 243352 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified |
| Resolutory Action | controller : issued new clearance other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 28800 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X and air carrier Y departed bwi and dca, en route requesting same altitude (same type aircraft). Air carrier Y was reduced to achieve spacing for climb behind air carrier X. Air carrier X was climbed to FL270 handed off to R32 and climbed to FL280. Air carrier Y was intended to climb to FL270, but incorrectly said FL280, apparently while looking at air carrier X data block of FL280. When air carrier Y mode C showed FL274, I inquired of pilot his altitude. He responded leveling FL280. I cleared him to maintain FL270 and vectored him, thought it might be 5 mi but took action regardless (as conflict alert had activated).
Original NASA ASRS Text
Title: ACR Y CLB TO OCCUPIED ALT HAD LTSS FROM ACR X. SYS ERROR.
Narrative: ACR X AND ACR Y DEPARTED BWI AND DCA, ENRTE REQUESTING SAME ALT (SAME TYPE ACFT). ACR Y WAS REDUCED TO ACHIEVE SPACING FOR CLB BEHIND ACR X. ACR X WAS CLBED TO FL270 HANDED OFF TO R32 AND CLBED TO FL280. ACR Y WAS INTENDED TO CLB TO FL270, BUT INCORRECTLY SAID FL280, APPARENTLY WHILE LOOKING AT ACR X DATA BLOCK OF FL280. WHEN ACR Y MODE C SHOWED FL274, I INQUIRED OF PLT HIS ALT. HE RESPONDED LEVELING FL280. I CLRED HIM TO MAINTAIN FL270 AND VECTORED HIM, THOUGHT IT MIGHT BE 5 MI BUT TOOK ACTION REGARDLESS (AS CONFLICT ALERT HAD ACTIVATED).
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.