<< >> NASA ASRS Report 756656, October 2007

A320 first officer reports wake turbulence encounter during climb through FL305; described as moderate with 10-15 degree rolls; with aircraft 8 NM ahead at FL310.

Attributes
ACN	756656
Time
Date	200710
Local Time Of Day	1201 To 1800
Place
Locale Reference	intersection : haakk
State Reference	MI
Altitude	msl single value : 31000
Aircraft 1
Controlling Facilities	artcc : zob.artcc tower : zzz.tower
Operator	common carrier : air carrier
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zob.artcc
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Experience	flight time last 90 days : 90 flight time total : 7200 flight time type : 3101
ASRS Report	756656
Events
Anomaly	inflight encounter : wake turbulence non adherence : required legal separation
Resolutory Action	flight crew : regained aircraft control
Supplementary
Problem Areas	ATC Human Performance Environmental Factor
Primary Problem	Environmental Factor

Narrative:

Cleveland center cleared us to climb to FL370. As we were climbing through FL305 to FL310 we experienced mod wake turbulence rolling aircraft 10 to 15 degrees left and right. After passing FL310 cleveland asks us in a hurried manner to report reaching FL320. We acknowledged his request and he again asked us to confirm passing FL320. We switched range scale for TCAS data and noticed target 2 hundred feet below us at FL310 and 8 miles directly ahead of us. Winds were directly on our tail at 60 KTS. I believe we had a separation error that gave us moderate wake turbulence and could have injured our flight attendants because of the relative smooth ride we had experienced as well as the ATC report of smooth ride.

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Original NASA ASRS Text

Title: A320 FO RPTS WAKE TURBULENCE ENCOUNTER DURING CLIMB THROUGH FL305; DESCRIBED AS MODERATE WITH 10-15 DEG ROLLS; WITH ACFT 8 NM AHEAD AT FL310.

Narrative: CLEVELAND CTR CLRED US TO CLB TO FL370. AS WE WERE CLBING THROUGH FL305 TO FL310 WE EXPERIENCED MOD WAKE TURBULENCE ROLLING ACFT 10 TO 15 DEGS L AND R. AFTER PASSING FL310 CLEVELAND ASKS US IN A HURRIED MANNER TO RPT REACHING FL320. WE ACKNOWLEDGED HIS REQUEST AND HE AGAIN ASKED US TO CONFIRM PASSING FL320. WE SWITCHED RANGE SCALE FOR TCAS DATA AND NOTICED TARGET 2 HUNDRED FEET BELOW US AT FL310 AND 8 MILES DIRECTLY AHEAD OF US. WINDS WERE DIRECTLY ON OUR TAIL AT 60 KTS. I BELIEVE WE HAD A SEPARATION ERROR THAT GAVE US MODERATE WAKE TURBULENCE AND COULD HAVE INJURED OUR FLT ATTENDANTS BECAUSE OF THE RELATIVE SMOOTH RIDE WE HAD EXPERIENCED AS WELL AS THE ATC RPT OF SMOOTH RIDE.

Data retrieved from NASA's ASRS site as of January 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.