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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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ZDC controller B757 through holding pattern of another air carrier without ensuring required separation.
| Attributes | |
| ACN | 476649 |
| Time | |
| Date | 200006 |
| Day | Thu |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | navaid : fak.vortac |
| State Reference | VA |
| Altitude | msl single value : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level cruise : holding |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zdc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | cruise : level cruise : holding |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | pilot : private |
| Experience | controller radar : 17 controller time certified in position1 : 0.8 flight time total : 55 |
| ASRS Report | 476649 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | airspace violation : entry altitude deviation : excursion from assigned altitude conflict : airborne less severe inflight encounter : weather non adherence : required legal separation non adherence : published procedure |
| Independent Detector | atc equipment other atc equipment : radar aircraft equipment : tcas other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : returned to original clearance flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 18000 vertical : 600 |
| Supplementary | |
| Problem Areas | ATC Human Performance Airspace Structure Flight Crew Human Performance Weather |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Both aircraft holding in 2 different holding patterns. Air carrier #2 cleared to lga via alternate route -- ccv.swv.sie.camrn.lga -- as instructed by area manager in charge. The route was due to thunderstorms along normal route. Air carrier #2 route was through the holding pattern of air carrier #1. Air carrier #1 was issued a 350 degree heading to clear air carrier #2. Air carrier #1 did not acknowledge the clearance and I did not realize this. When I observed air carrier #1 turning west in the pattern, I issued vectors to both aircraft. The aircraft were slow turning even though I asked for expeditious compliance. Air carrier #1 climbed due to TCASII alert. Other factors were -- no supervisor in area, and no help available due to late night staffing. Contributing to the missed readback was the fact I was having trouble putting the route in on air carrier #2 on the new dsr equipment. Supplemental information from acn 476926: following holding at fak (flat rock) for approximately 1 hour, reclred by ZDC to lga. We turned to an approximately heading of 100 degrees and had been on that heading for a short time when ATC directed an immediate right turn to a heading of 180 degrees. At the same time we received an RA on TCASII. The other aircraft stated that they had received a TCASII RA and had climbed slightly.
Original NASA ASRS Text
Title: ZDC CTLR B757 THROUGH HOLDING PATTERN OF ANOTHER ACR WITHOUT ENSURING REQUIRED SEPARATION.
Narrative: BOTH ACFT HOLDING IN 2 DIFFERENT HOLDING PATTERNS. ACR #2 CLRED TO LGA VIA ALTERNATE RTE -- CCV.SWV.SIE.CAMRN.LGA -- AS INSTRUCTED BY AREA MGR IN CHARGE. THE RTE WAS DUE TO TSTMS ALONG NORMAL RTE. ACR #2 RTE WAS THROUGH THE HOLDING PATTERN OF ACR #1. ACR #1 WAS ISSUED A 350 DEG HDG TO CLR ACR #2. ACR #1 DID NOT ACKNOWLEDGE THE CLRNC AND I DID NOT REALIZE THIS. WHEN I OBSERVED ACR #1 TURNING W IN THE PATTERN, I ISSUED VECTORS TO BOTH ACFT. THE ACFT WERE SLOW TURNING EVEN THOUGH I ASKED FOR EXPEDITIOUS COMPLIANCE. ACR #1 CLBED DUE TO TCASII ALERT. OTHER FACTORS WERE -- NO SUPVR IN AREA, AND NO HELP AVAILABLE DUE TO LATE NIGHT STAFFING. CONTRIBUTING TO THE MISSED READBACK WAS THE FACT I WAS HAVING TROUBLE PUTTING THE RTE IN ON ACR #2 ON THE NEW DSR EQUIP. SUPPLEMENTAL INFO FROM ACN 476926: FOLLOWING HOLDING AT FAK (FLAT ROCK) FOR APPROX 1 HR, RECLRED BY ZDC TO LGA. WE TURNED TO AN APPROX HEADING OF 100 DEGS AND HAD BEEN ON THAT HEADING FOR A SHORT TIME WHEN ATC DIRECTED AN IMMEDIATE R TURN TO A HEADING OF 180 DEGS. AT THE SAME TIME WE RECEIVED AN RA ON TCASII. THE OTHER ACFT STATED THAT THEY HAD RECEIVED A TCASII RA AND HAD CLBED SLIGHTLY.
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.