A gii encountered a B757's wake at 1300 ft after departing sna and involuntarily descended to 900 ft...

Attributes
ACN	824957
Time
Date	200902
Local Time Of Day	1201-1800
Place
Locale Reference	SNA.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Gulfstream II (G1159)
Operating Under FAR Part	Part 135
Flight Phase	Initial Climb
Route In Use	Other Noise Abatement
Flight Plan	IFR
Aircraft 2
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	Initial Climb
Flight Plan	IFR
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 105 Flight Crew Total 2200 Flight Crew Type 6300
Events
Anomaly	Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Published Material / Policy Inflight Event / Encounter Loss Of Aircraft Control Inflight Event / Encounter Wake Vortex Encounter

Narrative:

We departed sna at XA00Z. We had 7 passengers on a chartered flight. Just prior to our departure; a B757 departed on runway 19L. We departed on runway 19L and used our normal noise abatement departure procedures for sna. At 1300 ft MSL we encountered wake turbulence from the B757 and our altitude decreased to 900 ft MSL. We continued our departure with no further wake turbulence encounters. After we landed; the tower gave us a phone number to call; after shutdown I called the number and spoke with an FAA inspector. He informed me that a homeowner near the sna airport had reported a low flying aircraft and it was determined that this was our aircraft. I told him about the wake turbulence encounter and that it had caused a decrease in our altitude during our departure. He thanked me for the information and we concluded our discussion.

Original NASA ASRS Text

Title: A GII encountered a B757's wake at 1300 ft after departing SNA and involuntarily descended to 900 ft.

Narrative: We departed SNA at XA00Z. We had 7 passengers on a chartered flight. Just prior to our departure; a B757 departed on Runway 19L. We departed on Runway 19L and used our normal noise abatement departure procedures for SNA. At 1300 ft MSL we encountered wake turbulence from the B757 and our altitude decreased to 900 ft MSL. We continued our departure with no further wake turbulence encounters. After we landed; the tower gave us a phone number to call; after shutdown I called the number and spoke with an FAA inspector. He informed me that a homeowner near the SNA airport had reported a low flying aircraft and it was determined that this was our aircraft. I told him about the wake turbulence encounter and that it had caused a decrease in our altitude during our departure. He thanked me for the information and we concluded our discussion.

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.