 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
A11 controller involved in operational error when trying to separate C172 and F15 on arrival and a B747 anc departure.
| Attributes | |
| ACN | 485130 |
| Time | |
| Date | 200009 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : anc.vor |
| State Reference | AK |
| Altitude | msl bound lower : 1000 msl bound upper : 2000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : a11.tracon |
| Operator | general aviation : personal |
| Make Model Name | Skyhawk 172/Cutlass 172 |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other |
| Flight Phase | descent : approach |
| Route In Use | approach : charted visual arrival other |
| Flight Plan | VFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : a11.tracon |
| Operator | other |
| Make Model Name | Fighter |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : approach |
| Route In Use | approach : visual |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar pilot : private |
| Experience | controller radar : 20 controller time certified in position1 : 18 flight time total : 60 |
| ASRS Report | 485130 |
| Person 2 | |
| Affiliation | other |
| Function | flight crew : single pilot |
| Qualification | pilot : private |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne critical non adherence : published procedure non adherence : required legal separation other spatial deviation |
| Independent Detector | atc equipment : conflict alert aircraft equipment : tcas other controllera other flight crewa |
| Resolutory Action | controller : issued new clearance controller : issued advisory flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 6000 vertical : 250 |
| Supplementary | |
| Problem Areas | ATC Human Performance Airport Airspace Structure Flight Crew Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Inter Facility Coordination Failure Operational Error |
| Situations | |
| Airspace Structure | class c : anc.c |
Narrative:
A C172 was inbound to anc on a 'post office' arrival. The aircraft was conflicting with 2 flts of F15's (2) inbound to edf providing visual separation. The F15's did not descend as anticipated and aircraft #1 requested a 360 degree turn to remain clear of the F15's. When the aircraft completed the 360 degree turn, a B747 (aircraft #3) departed runway 32 at anc and climbed into aircraft #1. Aircraft #3 received a TCASII RA and descended to 1000 ft MSL to avoid aircraft #1. This also caused further problems with (2) other VFR aircraft transiting the north shoreline. Aircraft #1 was issued traffic at the last min on aircraft #3. Both pilots did not report the traffic in sight and aircraft #3 began an RA descent. Several actions could have been taken to avoid this situation: 1) aircraft #1 could have been issued traffic on aircraft #3 by the local controller position. Aircraft #3 also should have been given traffic. 2) aircraft #1 could have been delayed until the airspace was not so saturated. I believe changing the airspace to class B with specified VFR routes would alleviate this problem.
Original NASA ASRS Text
Title: A11 CTLR INVOLVED IN OPERROR WHEN TRYING TO SEPARATE C172 AND F15 ON ARR AND A B747 ANC DEP.
Narrative: A C172 WAS INBOUND TO ANC ON A 'POST OFFICE' ARR. THE ACFT WAS CONFLICTING WITH 2 FLTS OF F15'S (2) INBOUND TO EDF PROVIDING VISUAL SEPARATION. THE F15'S DID NOT DSND AS ANTICIPATED AND ACFT #1 REQUESTED A 360 DEG TURN TO REMAIN CLR OF THE F15'S. WHEN THE ACFT COMPLETED THE 360 DEG TURN, A B747 (ACFT #3) DEPARTED RWY 32 AT ANC AND CLBED INTO ACFT #1. ACFT #3 RECEIVED A TCASII RA AND DSNDED TO 1000 FT MSL TO AVOID ACFT #1. THIS ALSO CAUSED FURTHER PROBS WITH (2) OTHER VFR ACFT TRANSITING THE N SHORELINE. ACFT #1 WAS ISSUED TFC AT THE LAST MIN ON ACFT #3. BOTH PLTS DID NOT RPT THE TFC IN SIGHT AND ACFT #3 BEGAN AN RA DSCNT. SEVERAL ACTIONS COULD HAVE BEEN TAKEN TO AVOID THIS SIT: 1) ACFT #1 COULD HAVE BEEN ISSUED TFC ON ACFT #3 BY THE LCL CTLR POS. ACFT #3 ALSO SHOULD HAVE BEEN GIVEN TFC. 2) ACFT #1 COULD HAVE BEEN DELAYED UNTIL THE AIRSPACE WAS NOT SO SATURATED. I BELIEVE CHANGING THE AIRSPACE TO CLASS B WITH SPECIFIED VFR ROUTES WOULD ALLEVIATE THIS PROB.
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.