<< >> NASA ASRS Report 894096, June 2010

An ARTCC controller reported when he descended a C750 behind a B777 the C750 experienced uncommanded roll and lost 800 ft; even though there was 10 miles separation.

Attributes
ACN	894096
Time
Date	201006
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Aircraft 1
Make Model Name	Citation X (C750)
Flight Phase	Descent
Flight Plan	IFR
Aircraft 2
Make Model Name	B777 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Person 1
Function	Supervisor / CIC
Events
Anomaly	Inflight Event / Encounter Wake Vortex Encounter Inflight Event / Encounter Loss Of Aircraft Control

Narrative:

C750 was in a descent to FL200. B777 was in front 10 ahead on the same airway already level at FL200. Immediately upon reaching FL200 C750 reported a 50 degree roll and loss of 800 ft of altitude. Immediately below and in the vicinity of C750 were other aircraft [so the outcome] could have been disastrous.

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Original NASA ASRS Text

Title: An ARTCC Controller reported when he descended a C750 behind a B777 the C750 experienced uncommanded roll and lost 800 FT; even though there was 10 miles separation.

Narrative: C750 was in a descent to FL200. B777 was in front 10 ahead on the same airway already level at FL200. Immediately upon reaching FL200 C750 reported a 50 degree roll and loss of 800 FT of altitude. Immediately below and in the vicinity of C750 were other aircraft [so the outcome] could have been disastrous.

Data retrieved from NASA's ASRS site as of April 2012 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.