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An FA2000 encountered a B757 wake vortex at about 9000 ft on the lax riivr to runway 25L. The reporter was using a HUD to remain above the traffic.
| Attributes | |
| ACN | 824822 |
| Time | |
| Date | 200902 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | LAX.Airport |
| State Reference | CA |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | Falcon 2000 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Initial Approach |
| Route In Use | STAR RIIVR |
| Flight Plan | IFR |
| Person 1 | |
| Function | First Officer Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 100 Flight Crew Total 5500 Flight Crew Type 400 |
| Events | |
| Anomaly | Inflight Event / Encounter Loss Of Aircraft Control Inflight Event / Encounter Wake Vortex Encounter |
Narrative:
Cleared for RIIVR2 arrival; ILS runway 25L at lax; socal approach cautioned that there was a B757 10NM in front going to same runway. Had B757 lights in sight. I was flying with a HUD and kept the flight path marker (FPM) above the B757. We normally fly our descents using an FMS provided 2.5 degree descent angle until established on the ILS glide slope. The 2.5 degree descent angle was keeping the FPM above the B757 traffic. Our aircraft was on autopilot. We felt and commented on the 'nibbles' of wake turbulence. Captain was implying I should take pre-emptive; evasive action. We had a 25 knot headwind and I momentarily was trying to figure out an alternative source of the 'nibbles' when we entered the wake and were rocked and yawed noticeably. I disconnected autopilot and flew above the FMS provided flight path. Captain and I discussed that placing the FPM above the B757 is not enough; one must reference the B757 glide path defined by the B757 and the landing area and stay above this line (assuming the 757 is flying a constant gp). No further wake was encountered on this approach. Time; altitude and distance from lax are all approximate to the best of my recollection.
Original NASA ASRS Text
Title: An FA2000 encountered a B757 wake vortex at about 9000 ft on the LAX RIIVR to Runway 25L. The reporter was using a HUD to remain above the traffic.
Narrative: Cleared for RIIVR2 arrival; ILS Runway 25L at LAX; SOCAL approach cautioned that there was a B757 10NM in front going to same runway. Had B757 lights in sight. I was flying with a HUD and kept the flight path marker (FPM) above the B757. We normally fly our descents using an FMS provided 2.5 degree descent angle until established on the ILS glide slope. The 2.5 degree descent angle was keeping the FPM above the B757 traffic. Our aircraft was on autopilot. We felt and commented on the 'nibbles' of wake turbulence. Captain was implying I should take pre-emptive; evasive action. We had a 25 knot headwind and I momentarily was trying to figure out an alternative source of the 'nibbles' when we entered the wake and were rocked and yawed noticeably. I disconnected autopilot and flew above the FMS provided flight path. Captain and I discussed that placing the FPM above the B757 is not enough; one must reference the B757 glide path defined by the B757 and the landing area and stay above this line (assuming the 757 is flying a constant GP). No further wake was encountered on this approach. Time; altitude and distance from LAX are all approximate to the best of my recollection.
Data retrieved from NASA's ASRS site as of April 2012 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.