Controller did not issue cautionary wake turbulence advisory to an H60 passing the wake of a B757 be...

Attributes
ACN	1151619
Time
Date	201402
Local Time Of Day	0001-0600
Place
Locale Reference	SCT.TRACON
State Reference	CA
Aircraft 1
Make Model Name	S-70/UH-60 Blackhawk/Seahawk/Pavehawk/Knighthawk
Flight Phase	Final Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Route In Use	Other Instrument Approach
Flight Plan	IFR
Person 1
Function	Departure
Qualification	Air Traffic Control Fully Certified
Experience	Air Traffic Control Radar 23
Events
Anomaly	ATC Issue All Types Deviation - Procedural Published Material / Policy

Narrative:

H60 apparently entered into the protected 'remnant' airspace behind the B757. Traffic was exchanged and reported in sight and the H60 was told to maintain visual separation from the B757; but I guess I was supposed to say caution wake turbulence. The helicopter was within the 'remnant' airspace which is supposedly defined as 2;500 ft laterally from the path of the B757. There is no way for a controller to tell where this 'remnant' exists; therefore there is no way to ensure that another aircraft remains outside of this so-called 'remnant'! Lesson learned; I'll just say 'caution wake turbulence' in every transmission! Or; give us a tool to let us know where this protected airspace exists.

Original NASA ASRS Text

Title: Controller did not issue cautionary wake turbulence advisory to an H60 passing the wake of a B757 because the Controller had no way of determining 2;500 feet remnant airspace.

Narrative: H60 apparently entered into the protected 'Remnant' airspace behind the B757. Traffic was exchanged and reported in sight and the H60 was told to maintain visual separation from the B757; but I guess I was supposed to say caution wake turbulence. The helicopter was within the 'Remnant' airspace which is supposedly defined as 2;500 FT laterally from the path of the B757. There is no way for a controller to tell where this 'Remnant' exists; therefore there is no way to ensure that another aircraft remains outside of this so-called 'Remnant'! Lesson learned; I'll just say 'caution wake turbulence' in every transmission! Or; give us a tool to let us know where this protected airspace exists.

Data retrieved from NASA's ASRS site 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.

Controller did not issue cautionary wake turbulence advisory to an H60 passing the wake of a B757 because the controller had no way of determining 2;500 feet remnant airspace.