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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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ZTL exercises extra diligence to validate clearance acknowledgement when perceiving an air carrier has taken another air carrier's climb clearance.
| Attributes | |
| ACN | 525087 |
| Time | |
| Date | 200109 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : ztl.artcc |
| State Reference | GA |
| Altitude | msl bound lower : 27000 msl bound upper : 33000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl.artcc artcc : ztl.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | EMB ERJ 145 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : ztl.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Experience | controller limited radar : 19.5 controller non radar : 19.5 controller radar : 19.5 controller time certified in position1 : 19 |
| ASRS Report | 525087 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance non adherence : published procedure |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued alert other |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | Environmental Factor Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Air carrier X (bna to ewr via vxv) was assigned FL270 by the previous controller, requesting FL330. I was working about 8 to 10 other aircraft at the time, including north bound air carrier Y requesting FL350. When I cleared the air carrier Y aircraft to FL330, it sounded to me as if two people answered my last transmission. Consequently, I immediately broadcast something like, 'it sounded as if two people answered that last transmission. That clearance was for air carrier Y.' when I unkeyed my microphone, I heard someone say 'blocked' indicating that my transmission had been blocked by an aircraft, so I then transmitted something like, 'the last clearance to FL330 was for air carrier Y, I have not cleared any other aircraft to FL330 in the last few mins.' the air carrier Y pilot then acknowledged the clearance. A couple mins later, I observed aircraft X climbing and I asked him to say assigned attitude,
Original NASA ASRS Text
Title: ZTL EXERCISES EXTRA DILIGENCE TO VALIDATE CLRNC ACKNOWLEDGEMENT WHEN PERCEIVING AN ACR HAS TAKEN ANOTHER ACR'S CLB CLRNC.
Narrative: ACR X (BNA TO EWR VIA VXV) WAS ASSIGNED FL270 BY THE PREVIOUS CTLR, REQUESTING FL330. I WAS WORKING ABOUT 8 TO 10 OTHER ACFT AT THE TIME, INCLUDING N BOUND ACR Y REQUESTING FL350. WHEN I CLEARED THE ACR Y ACFT TO FL330, IT SOUNDED TO ME AS IF TWO PEOPLE ANSWERED MY LAST XMISSION. CONSEQUENTLY, I IMMEDIATELY BROADCAST SOMETHING LIKE, 'IT SOUNDED AS IF TWO PEOPLE ANSWERED THAT LAST XMISSION. THAT CLRNC WAS FOR ACR Y.' WHEN I UNKEYED MY MIC, I HEARD SOMEONE SAY 'BLOCKED' INDICATING THAT MY XMISSION HAD BEEN BLOCKED BY AN ACFT, SO I THEN TRANSMITTED SOMETHING LIKE, 'THE LAST CLRNC TO FL330 WAS FOR ACR Y, I HAVE NOT CLEARED ANY OTHER ACFT TO FL330 IN THE LAST FEW MINS.' THE ACR Y PLT THEN ACKNOWLEDGED THE CLRNC. A COUPLE MINS LATER, I OBSERVED ACFT X CLBING AND I ASKED HIM TO SAY ASSIGNED ATTITUDE,
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.