A90 controller described a probable loss of wake separation when a 'large' aircraft was permitted to...

Attributes
ACN	1114190
Time
Date	201309
Local Time Of Day	0601-1200
Place
Locale Reference	A90.TRACON
State Reference	NH
Aircraft 1
Make Model Name	Dash 8-100
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Route In Use	Visual Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	HS 125 Series
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Route In Use	Visual Approach
Flight Plan	IFR
Person 1
Function	Approach Departure
Qualification	Air Traffic Control Fully Certified
Events
Anomaly	ATC Issue All Types Deviation - Procedural Published Material / Policy

Narrative:

Approaches to parallel runways were in use; runway's 33L/33R. Runway 33R is a short runway; only 2;500 ft long; used primarily for (small) aircraft only. In this situation a DH8 (large) was landing on 33R and the H25A was landing on 33L (small). The DH8 had to slow to his final approach speed early in the approach in order to successfully land on the small runway and compression was excessive. Plus; it was unusual to have a large aircraft landing on runway 33R and wake turbulence was overlooked. The parallel runways are considered same runway for wake turbulence and the H25A was less than 4 miles when the DH8 landed on 33R. Do not allow large aircraft to land on 33R. They have to go so slow to successfully land that it does not make the operation any more efficient than if they had gone to 33L.

Original NASA ASRS Text

Title: A90 Controller described a probable loss of wake separation when a 'large' aircraft was permitted to land on Runway 33R; the reporter suggested that 'large' aircraft be prohibited from using Runway 33R.

Narrative: Approaches to parallel runways were in use; Runway's 33L/33R. Runway 33R is a short runway; only 2;500 FT long; used primarily for (small) aircraft only. In this situation a DH8 (large) was landing on 33R and the H25A was landing on 33L (small). The DH8 had to slow to his final approach speed early in the approach in order to successfully land on the small runway and compression was excessive. Plus; it was unusual to have a large aircraft landing on Runway 33R and wake turbulence was overlooked. The parallel runways are considered same runway for wake turbulence and the H25A was less than 4 miles when the DH8 landed on 33R. Do not allow large aircraft to land on 33R. They have to go so slow to successfully land that it does not make the operation any more efficient than if they had gone to 33L.

Data retrieved from NASA's ASRS site as of July 2013 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.

A90 controller described a probable loss of wake separation when a 'large' aircraft was permitted to land on runway 33R; the reporter suggested that 'large' aircraft be prohibited from using runway 33R.