<< >> NASA ASRS Report 395862, March 1998

Flight crew of C550 encounters wake turbulence from a DC10 which was held level and padded them prior to their clearance to climb.

Attributes
ACN	395862
Time
Date	199803
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : lrp
State Reference	PA
Altitude	msl bound lower : 16500 msl bound upper : 18000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zny
Operator	general aviation : corporate
Make Model Name	Citation II S2/Bravo
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : on vectors
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	DC-10 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 110 flight time total : 8000 flight time type : 2300
ASRS Report	395862
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	inflight encounter other
Independent Detector	other flight crewa
Resolutory Action	none taken : insufficient time
Consequence	Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

We departed reading, PA, and were being issued vectors for our climb. ZNY was also vectoring a DC10 at FL180 above us. Controller issued a TA regarding the DC10 at 12 O'clock, FL180 and cleared us to climb to FL230. He advised that we were '5.5 mi behind the DC10, caution wake turbulence.' at 16500 ft MSL, we encountered a brief period of turbulence consisting of a rapid shuddering sensation followed by a roll to the left of approximately 10-15 degrees. Center should have offset our flight paths so as not to cross directly beneath the heavy DC10. Callback conversation with reporter revealed the following information: reporter states that he will not accept a clearance behind a heavy aircraft with such minimal separation. He had not encountered wake turbulence from a heavy aircraft before. He feels ATC could have vectored his aircraft so it was not directly in trail of the DC10.

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Original NASA ASRS Text

Title: FLC OF C550 ENCOUNTERS WAKE TURB FROM A DC10 WHICH WAS HELD LEVEL AND PADDED THEM PRIOR TO THEIR CLRNC TO CLB.

Narrative: WE DEPARTED READING, PA, AND WERE BEING ISSUED VECTORS FOR OUR CLB. ZNY WAS ALSO VECTORING A DC10 AT FL180 ABOVE US. CTLR ISSUED A TA REGARDING THE DC10 AT 12 O'CLOCK, FL180 AND CLRED US TO CLB TO FL230. HE ADVISED THAT WE WERE '5.5 MI BEHIND THE DC10, CAUTION WAKE TURB.' AT 16500 FT MSL, WE ENCOUNTERED A BRIEF PERIOD OF TURB CONSISTING OF A RAPID SHUDDERING SENSATION FOLLOWED BY A ROLL TO THE L OF APPROX 10-15 DEGS. CTR SHOULD HAVE OFFSET OUR FLT PATHS SO AS NOT TO CROSS DIRECTLY BENEATH THE HVY DC10. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THAT HE WILL NOT ACCEPT A CLRNC BEHIND A HVY ACFT WITH SUCH MINIMAL SEPARATION. HE HAD NOT ENCOUNTERED WAKE TURB FROM A HVY ACFT BEFORE. HE FEELS ATC COULD HAVE VECTORED HIS ACFT SO IT WAS NOT DIRECTLY IN TRAIL OF THE DC10.

Data retrieved from NASA's ASRS site as of July 2007 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.