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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Approach controller gave an air carrier light transport a descent through the altitude of another aircraft. The air carrier received a TCASII TA and at the same time the controller told the air carrier to maintain 6000 ft for traffic. The air carrier had the other aircraft in sight and climbed back to 6000 ft.
| Attributes | |
| ACN | 388400 |
| Time | |
| Date | 199712 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : bos |
| State Reference | MA |
| Altitude | msl bound lower : 5700 msl bound upper : 6000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : bos |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unknown |
| Flight Phase | cruise other |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 4800 flight time type : 200 |
| ASRS Report | 388400 |
| 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 |
| 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 : 5000 vertical : 800 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Descending through 6000 ft down to 3000 ft saw aircraft on TCASII and visually 1000 ft below. I started to slow descent rate and ATC told us to maintain 6000 ft for traffic. TCASII gave a traffic alert and we were at 5700 ft and climbed up to 6000 ft without any further incursion.
Original NASA ASRS Text
Title: APCH CTLR GAVE AN ACR LTT A DSCNT THROUGH THE ALT OF ANOTHER ACFT. THE ACR RECEIVED A TCASII TA AND AT THE SAME TIME THE CTLR TOLD THE ACR TO MAINTAIN 6000 FT FOR TFC. THE ACR HAD THE OTHER ACFT IN SIGHT AND CLBED BACK TO 6000 FT.
Narrative: DSNDING THROUGH 6000 FT DOWN TO 3000 FT SAW ACFT ON TCASII AND VISUALLY 1000 FT BELOW. I STARTED TO SLOW DSCNT RATE AND ATC TOLD US TO MAINTAIN 6000 FT FOR TFC. TCASII GAVE A TFC ALERT AND WE WERE AT 5700 FT AND CLBED UP TO 6000 FT WITHOUT ANY FURTHER INCURSION.
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.