H25B encounters moderate wake turbulence upset in terminal area at 7000 ft MSL.

Attributes
ACN	762931
Time
Date	200711
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : iad.airport
State Reference	VA
Altitude	msl single value : 7000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : pct.tracon
Operator	general aviation : personal
Make Model Name	BAe 125 Series 800
Operating Under FAR Part	Part 91
Flight Phase	descent : intermediate altitude
Route In Use	arrival star : hyper
Flight Plan	IFR
Person 1
Affiliation	other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 90 flight time total : 11600 flight time type : 2000
ASRS Report	762931
Events
Anomaly	inflight encounter : wake turbulence other anomaly
Independent Detector	other flight crewa
Resolutory Action	flight crew : regained aircraft control
Supplementary
Problem Areas	Environmental Factor
Primary Problem	Environmental Factor

Narrative:

Encountered moderate wake turbulence at 7000 ft; level flight; 250 KIAS. Resulted in approximately 40 degree bank; rolling to the left. Nearest aircraft on TCAS was 8 NM ahead of us. Controller stated we were following an erj; but that a 777 was 20 miles ahead of us. No other clues to the upset.

Original NASA ASRS Text

Title: H25B ENCOUNTERS MODERATE WAKE TURB UPSET IN TERMINAL AREA AT 7000 FT MSL.

Narrative: ENCOUNTERED MODERATE WAKE TURB AT 7000 FT; LEVEL FLT; 250 KIAS. RESULTED IN APPROX 40 DEG BANK; ROLLING TO THE L. NEAREST ACFT ON TCAS WAS 8 NM AHEAD OF US. CTLR STATED WE WERE FOLLOWING AN ERJ; BUT THAT A 777 WAS 20 MILES AHEAD OF US. NO OTHER CLUES TO THE UPSET.

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.