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ARTCC radar controller misspoke altitude for air carrier X to maintain on the pye arrival, then pointed out traffic to the air carrier. The air carrier said he was looking and started a slow descent and separation was lost with aircraft B.
| Attributes | |
| ACN | 341651 |
| Time | |
| Date | 199607 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : sac |
| State Reference | CA |
| Altitude | msl bound lower : 33000 msl bound upper : 34700 |
| Environment | |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa tracon : pdx |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Route In Use | arrival 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 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 2 |
| ASRS Report | 341651 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified |
| Resolutory Action | other |
| Consequence | Other |
| Miss Distance | horizontal : 25680 vertical : 1700 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I cleared aircraft to sfo via pye and the arrival. Then I inadvertently stated maintain FL330 (aircraft was at FL350). I did not catch the readback because aircraft radios were poor. Traffic was quoted at 12 O'clock 5 mi sbound at FL330. At this point aircraft inbound to sfo had not begun descent. He started looking and descended anyways. Controllers are not perfect. Pilots should feel free to question a clearance if it puts them in conflict with another aircraft or even terrain.
Original NASA ASRS Text
Title: ARTCC RADAR CTLR MISSPOKE ALT FOR ACR X TO MAINTAIN ON THE PYE ARR, THEN POINTED OUT TFC TO THE ACR. THE ACR SAID HE WAS LOOKING AND STARTED A SLOW DSCNT AND SEPARATION WAS LOST WITH ACFT B.
Narrative: I CLRED ACFT TO SFO VIA PYE AND THE ARR. THEN I INADVERTENTLY STATED MAINTAIN FL330 (ACFT WAS AT FL350). I DID NOT CATCH THE READBACK BECAUSE ACFT RADIOS WERE POOR. TFC WAS QUOTED AT 12 O'CLOCK 5 MI SBOUND AT FL330. AT THIS POINT ACFT INBOUND TO SFO HAD NOT BEGUN DSCNT. HE STARTED LOOKING AND DSNDED ANYWAYS. CTLRS ARE NOT PERFECT. PLTS SHOULD FEEL FREE TO QUESTION A CLRNC IF IT PUTS THEM IN CONFLICT WITH ANOTHER ACFT OR EVEN TERRAIN.
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.