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Large transport aircraft with descent clearance in foreign airspace was cleared to climb back to altitude due to conflicting traffic.
| Attributes | |
| ACN | 369670 |
| Time | |
| Date | 199705 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : sllp |
| State Reference | FO |
| Altitude | msl bound lower : 21500 msl bound upper : 23000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Route In Use | enroute airway : sllp |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unknown |
| Flight Phase | climbout : intermediate altitude |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 60 flight time total : 8000 flight time type : 1500 |
| ASRS Report | 369670 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Deviation Inter Facility Coordination Failure |
Narrative:
30 mi north of la paz, on J1, we were cleared to 15000 ft. We were handed off from mazatlan center to la paz approach, and they cleared us to 11000 ft. After passing la paz VOR, approach asked us our altitude. I replied, passing 22600 ft for 11000 ft. Approach asked us to maintain 23000 ft for traffic. I told them we would go through the altitude, but we would level off and climb back up. We immediately stopped the descent and climbed back to 23000 ft from 21500 ft. There was another aircraft which departed san jose del cabo and had been cleared up to 28000 ft. That aircraft was in view. They were told to level off at 21000 ft. I called traffic in sight, and that we were passing abeam them. Approach at that time, cleared us down to 11000 ft. 2 airplanes headed for the same fix, one climbing, and one descending, with no altitude restr. There was a misjudgement or lack of communications among the controllers in the timing/clearance for altitude restr.
Original NASA ASRS Text
Title: LGT ACFT WITH DSCNT CLRNC IN FOREIGN AIRSPACE WAS CLRED TO CLB BACK TO ALT DUE TO CONFLICTING TFC.
Narrative: 30 MI N OF LA PAZ, ON J1, WE WERE CLRED TO 15000 FT. WE WERE HANDED OFF FROM MAZATLAN CTR TO LA PAZ APCH, AND THEY CLRED US TO 11000 FT. AFTER PASSING LA PAZ VOR, APCH ASKED US OUR ALT. I REPLIED, PASSING 22600 FT FOR 11000 FT. APCH ASKED US TO MAINTAIN 23000 FT FOR TFC. I TOLD THEM WE WOULD GO THROUGH THE ALT, BUT WE WOULD LEVEL OFF AND CLB BACK UP. WE IMMEDIATELY STOPPED THE DSCNT AND CLBED BACK TO 23000 FT FROM 21500 FT. THERE WAS ANOTHER ACFT WHICH DEPARTED SAN JOSE DEL CABO AND HAD BEEN CLRED UP TO 28000 FT. THAT ACFT WAS IN VIEW. THEY WERE TOLD TO LEVEL OFF AT 21000 FT. I CALLED TFC IN SIGHT, AND THAT WE WERE PASSING ABEAM THEM. APCH AT THAT TIME, CLRED US DOWN TO 11000 FT. 2 AIRPLANES HEADED FOR THE SAME FIX, ONE CLBING, AND ONE DSNDING, WITH NO ALT RESTR. THERE WAS A MISJUDGEMENT OR LACK OF COMS AMONG THE CTLRS IN THE TIMING/CLRNC FOR ALT RESTR.
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.