CL600 FLT CREW RPTS WAKE TURB ENCOUNTER WITH PRECEDING A320 DEPARTING RWY 7L AT PHX. STICK SHAKER ACTIVATES BRIEFLY.

2007-12 · NASA ASRS report 765382

Date: 2007-12 · Aircraft: Regional Jet CL65; Undifferentiated or Other Model · Phase: takeoff

Anomalies: inflight-event-encounter-wake-vortex-encounter

Synopsis

CL600 FLT CREW RPTS WAKE TURB ENCOUNTER WITH PRECEDING A320 DEPARTING RWY 7L AT PHX. STICK SHAKER ACTIVATES BRIEFLY.

Narrative

GIVEN TAXI INTO POSITION HOLD INSTRUCTIONS FOR RWY 7L AND ASKED TO RPT PRECEDING TFC; AN A320 IN SIGHT. JUST PRIOR TO THE ACFT AHEAD ROTATING WE WERE CLRED FOR TAKEOFF. A STANDING TKOF WAS PERFORMED TO ALLOW FOR SLIGHTLY ADDITIONAL SPACING. ROTATION POINT OF THE A320 WAS NOTED AS FAIRLY DISTANT DOWN THE RWY. OUR ACFT ACCELERATED SLUGGISHLY DUE TO THE HIGH WT (1300 LBS BELOW MGTOW) AND THE LOW THRUST SETTING (85.4%) N1 FLX TKOF. SHORTLY AFTER ROTATION AT V2 PLUS 12 KTS WE ENCOUNTERED WAKE TURBULENCE FROM THE PRECEDING DEP THAT BRIEFLY ACTIVATED THE STICK SHAKER. AN OFFSET WAS MADE TO THE RIGHT OF COURSE AND NO OTHER SUBSTANTIAL TURBULENCE WAS NOTED THE REMAINDER OF THE DEP. THE INCIDENT WAS FAIRLY COMMON FOR EASTBOUND PHX DEPS OTHER THAN THE ACTIVATION OF THE STICK SHAKER. IT ACTUALLY RARELY OCCURS THAT YOU ENCOUNTER ANY WAKE TURBULENCE; AND IN THIS INSTANCE IT WAS ONLY THE ONE JOLT THAT ACTIVATED THE STICK SHAKER. CONTRIBUTING FACTORS INCLUDE: FAILURE FOR FLT CREW TO ALLOW ADDITIONAL SPACING BETWEEN DEPS; TOWER CTLR'S RUSH TO GET DEPS OUT DURING A DEP BANK; FAILURE TO RECOGNIZE FLT PATH OF THE OTHER ACFT AND FAILURE TO TAKE CORRECTIVE COURSE ACTION PRIOR TO ENTERING THE OTHER ACFT'S WAKE.

Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.

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