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Amended clearance altitude change given at last min to climbing air carrier dc-9. Clearance had been to climb to occupied altitude.
| Attributes | |
| ACN | 279522 |
| Time | |
| Date | 199408 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : msy |
| State Reference | LA |
| Altitude | msl bound lower : 14000 msl bound upper : 14500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zhu tracon : msy tower : tri |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| 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 |
| Flight Plan | IFR |
| 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 : 14000 flight time type : 7200 |
| ASRS Report | 279522 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot conflict : airborne less severe non adherence : required legal separation other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance flight crew : exited adverse environment other |
| Consequence | Other |
| Miss Distance | horizontal : 18000 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
| Situations | |
| ATC Facility | procedure or policy : unspecified |
Narrative:
Airline flight msy-dtw. After takeoff from msy, cleared by msy departure to climb on course to 15000 ft. Climbing through 13000 ft told to contact ZHU 133.5. I contacted hou and said 'flight leaving 14000 ft for 15000 ft.' (we were climbing at 2000 FPM.) center responded 'maintain 14000 ft.' I looked at the first officer who was flying. He immediately lowered the nose, leveling at 14500 ft and immediately descended to 14000 ft. No response from center. I asked center why the 14000 ft restr and he simply replied 'traffic.' I asked him where the traffic was and he said '3 mi behind you and at 15000 ft' he said nothing about us being too close and no indication on our TCASII but I was concerned about our actual separation. There was no way we could have physically leveled off when he told us to.
Original NASA ASRS Text
Title: AMENDED CLRNC ALT CHANGE GIVEN AT LAST MIN TO CLBING ACR DC-9. CLRNC HAD BEEN TO CLB TO OCCUPIED ALT.
Narrative: AIRLINE FLT MSY-DTW. AFTER TKOF FROM MSY, CLRED BY MSY DEP TO CLB ON COURSE TO 15000 FT. CLBING THROUGH 13000 FT TOLD TO CONTACT ZHU 133.5. I CONTACTED HOU AND SAID 'FLT LEAVING 14000 FT FOR 15000 FT.' (WE WERE CLBING AT 2000 FPM.) CTR RESPONDED 'MAINTAIN 14000 FT.' I LOOKED AT THE FO WHO WAS FLYING. HE IMMEDIATELY LOWERED THE NOSE, LEVELING AT 14500 FT AND IMMEDIATELY DSNDED TO 14000 FT. NO RESPONSE FROM CTR. I ASKED CTR WHY THE 14000 FT RESTR AND HE SIMPLY REPLIED 'TFC.' I ASKED HIM WHERE THE TFC WAS AND HE SAID '3 MI BEHIND YOU AND AT 15000 FT' HE SAID NOTHING ABOUT US BEING TOO CLOSE AND NO INDICATION ON OUR TCASII BUT I WAS CONCERNED ABOUT OUR ACTUAL SEPARATION. THERE WAS NO WAY WE COULD HAVE PHYSICALLY LEVELED OFF WHEN HE TOLD US TO.
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.