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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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An medium large transport air carrier was mistakenly issued a descent to FL270 instead of FL280. The controller pointed out traffic at FL270. The descending medium large transport air carrier received a TCASII RA at FL275 and started a climb. After landing, the flight crew learned that the controller had in fact issued them the wrong altitude.
| Attributes | |
| ACN | 361424 |
| Time | |
| Date | 199702 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : ave |
| State Reference | CA |
| Altitude | msl bound lower : 27200 msl bound upper : 28000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Route In Use | enroute airway : zla |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unknown |
| 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 : 240 flight time total : 17000 flight time type : 4500 |
| ASRS Report | 361424 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial pilot : cfi |
| Experience | flight time last 90 days : 240 flight time total : 6500 flight time type : 3500 |
| ASRS Report | 361748 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified aircraft equipment other aircraft equipment : unspecified other controllera |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | horizontal : 6000 vertical : 300 |
Narrative:
Initially cleared to descend to FL240, controller then revised clearance to descend to FL270. At about FL275 controller pointed out traffic at FL270. At FL272 we got a 'climb, climb' RA from TCASII. Controller asked us our altitude we stated that we had been at FL272 and were now climbing to respond to RA. He said that we had been cleared to FL280. We responded with 'no sir you cleared us to FL270.' he told us tapes were being pulled there was a discrepancy. We had traffic on TCASII. On ground in lax we were instructed to call center. They informed us that we had been cleared to FL270 and had done as instructed.
Original NASA ASRS Text
Title: AN MLG ACR WAS MISTAKENLY ISSUED A DSCNT TO FL270 INSTEAD OF FL280. THE CTLR POINTED OUT TFC AT FL270. THE DSNDING MLG ACR RECEIVED A TCASII RA AT FL275 AND STARTED A CLB. AFTER LNDG, THE FLC LEARNED THAT THE CTLR HAD IN FACT ISSUED THEM THE WRONG ALT.
Narrative: INITIALLY CLRED TO DSND TO FL240, CTLR THEN REVISED CLRNC TO DSND TO FL270. AT ABOUT FL275 CTLR POINTED OUT TFC AT FL270. AT FL272 WE GOT A 'CLB, CLB' RA FROM TCASII. CTLR ASKED US OUR ALT WE STATED THAT WE HAD BEEN AT FL272 AND WERE NOW CLBING TO RESPOND TO RA. HE SAID THAT WE HAD BEEN CLRED TO FL280. WE RESPONDED WITH 'NO SIR YOU CLRED US TO FL270.' HE TOLD US TAPES WERE BEING PULLED THERE WAS A DISCREPANCY. WE HAD TFC ON TCASII. ON GND IN LAX WE WERE INSTRUCTED TO CALL CTR. THEY INFORMED US THAT WE HAD BEEN CLRED TO FL270 AND HAD DONE AS INSTRUCTED.
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.