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Flight crew were confused when the next ARTCC controller, to which they were just handed off, stopped their descent back to their previous en route altitude to go back to the next higher altitude.
| Attributes | |
| ACN | 440811 |
| Time | |
| Date | 199906 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : ilc.vortac |
| State Reference | UT |
| Altitude | msl bound lower : 28400 msl bound upper : 29000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zlc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other other vortac |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zlc.artcc |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : flight engineer pilot : cfi |
| Experience | flight time last 90 days : 220 flight time total : 9500 flight time type : 6300 |
| ASRS Report | 440811 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : multi engine pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 9000 flight time type : 7000 |
| ASRS Report | 440910 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued alert controller : issued new clearance flight crew : returned to assigned altitude |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | other |
Narrative:
While talking to ZLC on frequency 133.6, we had requested and received a clearance to climb from FL280 to FL310. As climb was completed, a frequency change was given to go to 125.57. Shortly after checking in, a descent was given back to FL280. Somewhat surprised, we asked for confirmation that we were to descend back to FL280. It was confirmed and off we went. At FL284, we were told to climb immediately to FL290. Traffic did appear on the TCASII screen but no warnings or resolutions were given by the TCASII computer. If we were only cleared to FL290 and not FL280, in the future, it would be nice to hear something to the effect of 'wrong direction altitude.'
Original NASA ASRS Text
Title: FLC WERE CONFUSED WHEN THE NEXT ARTCC CTLR, TO WHICH THEY WERE JUST HANDED OFF, STOPPED THEIR DSCNT BACK TO THEIR PREVIOUS ENRTE ALT TO GO BACK TO THE NEXT HIGHER ALT.
Narrative: WHILE TALKING TO ZLC ON FREQ 133.6, WE HAD REQUESTED AND RECEIVED A CLRNC TO CLB FROM FL280 TO FL310. AS CLB WAS COMPLETED, A FREQ CHANGE WAS GIVEN TO GO TO 125.57. SHORTLY AFTER CHKING IN, A DSCNT WAS GIVEN BACK TO FL280. SOMEWHAT SURPRISED, WE ASKED FOR CONFIRMATION THAT WE WERE TO DSND BACK TO FL280. IT WAS CONFIRMED AND OFF WE WENT. AT FL284, WE WERE TOLD TO CLB IMMEDIATELY TO FL290. TFC DID APPEAR ON THE TCASII SCREEN BUT NO WARNINGS OR RESOLUTIONS WERE GIVEN BY THE TCASII COMPUTER. IF WE WERE ONLY CLRED TO FL290 AND NOT FL280, IN THE FUTURE, IT WOULD BE NICE TO HEAR SOMETHING TO THE EFFECT OF 'WRONG DIRECTION ALT.'
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.