<< >> NASA ASRS Report 802317, August 2008

Descent prior to an issued crossing restr puts a crj into an encounter with wake turbulence of the preceding aircraft.

Attributes
ACN	802317
Time
Date	200808
Place
Locale Reference	airport : clt.airport
State Reference	NC
Altitude	msl single value : 4000
Aircraft 1
Controlling Facilities	tower : clt.tower tower : sfo.tower
Operator	common carrier : air carrier
Make Model Name	Regional Jet 700 ER&LR
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	802317
Events
Anomaly	altitude deviation : excursion from assigned altitude inflight encounter : wake turbulence non adherence : clearance
Independent Detector	other flight crewa
Resolutory Action	flight crew : returned to original clearance
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance

Narrative:

Were cleared visual runway 23 cross 11 mi out at 4000 ft. PF immediately started down out of 4000 ft. I corrected him and he began a climb back toward 4000 ft and we entered wake turbulence from the aircraft in front of us. He was startled and I assumed control and went back to 4000 ft. First officer is fairly new and did not comprehend what the clearance was. He said he thought we were cleared for a visual and he could descend when he wanted to. Said he did not hear her say cross 11 mi out at 4000 ft.

Related reports:

• Wake turbulence encounter due to crossing arrival rtes.
• A crew reports wake turbulence encounter near hln at FL340 f...

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Original NASA ASRS Text

Title: DSCNT PRIOR TO AN ISSUED CROSSING RESTR PUTS A CRJ INTO AN ENCOUNTER WITH WAKE TURBULENCE OF THE PRECEDING ACFT.

Narrative: WERE CLEARED VISUAL RWY 23 CROSS 11 MI OUT AT 4000 FT. PF IMMEDIATELY STARTED DOWN OUT OF 4000 FT. I CORRECTED HIM AND HE BEGAN A CLB BACK TOWARD 4000 FT AND WE ENTERED WAKE TURBULENCE FROM THE ACFT IN FRONT OF US. HE WAS STARTLED AND I ASSUMED CTL AND WENT BACK TO 4000 FT. FO IS FAIRLY NEW AND DID NOT COMPREHEND WHAT THE CLRNC WAS. HE SAID HE THOUGHT WE WERE CLEARED FOR A VISUAL AND HE COULD DSND WHEN HE WANTED TO. SAID HE DID NOT HEAR HER SAY CROSS 11 MI OUT AT 4000 FT.

Data retrieved from NASA's ASRS site as of May 2009 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.