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B737-400 first officer reported deviating from ATC assigned speed when they encountered wake turbulence from preceding aircraft on arrival to lax.
| Attributes | |
| ACN | 1024836 |
| Time | |
| Date | 201207 |
| Place | |
| Locale Reference | LAX.Airport |
| State Reference | CA |
| Aircraft 1 | |
| Make Model Name | B737-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Descent |
| Route In Use | STAR SADDE 6 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | Descent |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Events | |
| Anomaly | ATC Issue All Types Deviation - Procedural Clearance Deviation - Speed All Types Inflight Event / Encounter Wake Vortex Encounter |
Narrative:
Upon descent into lax on the sadde 6 arrival we were assigned speed 250 KTS over symon. Shortly after symon; we were given the speed 220 KTS. We then began to get light to moderate wake turbulence due to the aircraft ahead of us showing less than 5 miles separation on our TCAS. The captain began slowing to give us more separation from our traffic. Shortly before smo VOR we were queried on our speed. We were at 200 KTS and stated so. The controller told us to speed up to 220 KTS to which we promptly did. The flight continued the arrival and approach with no further incident. The captain spoke with the supervisor at socal approach over the phone and explained his intentions. The primary cause of this event was our airplane entering an area of wake turbulence from the aircraft ahead of us. Based on our TCAS; it appeared we were less than 5 miles from them. The captain began to slow in order to give space and lessen the turbulence. Our failure was to inform ATC of our speed reduction.
Original NASA ASRS Text
Title: B737-400 First Officer reported deviating from ATC assigned speed when they encountered wake turbulence from preceding aircraft on arrival to LAX.
Narrative: Upon descent into LAX on the SADDE 6 arrival we were assigned speed 250 KTS over SYMON. Shortly after SYMON; we were given the speed 220 KTS. We then began to get light to moderate wake turbulence due to the aircraft ahead of us showing less than 5 miles separation on our TCAS. The Captain began slowing to give us more separation from our traffic. Shortly before SMO VOR we were queried on our speed. We were at 200 KTS and stated so. The Controller told us to speed up to 220 KTS to which we promptly did. The flight continued the arrival and approach with no further incident. The Captain spoke with the supervisor at SoCal Approach over the phone and explained his intentions. The primary cause of this event was our airplane entering an area of wake turbulence from the aircraft ahead of us. Based on our TCAS; it appeared we were less than 5 miles from them. The Captain began to slow in order to give space and lessen the turbulence. Our failure was to inform ATC of our speed reduction.
Data retrieved from NASA's ASRS site as of July 2013 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.