B727 had less than standard separation behind B757. System error.

Attributes
ACN	279113
Time
Date	199408
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : ewr
State Reference	NJ
Altitude	msl bound lower : 1700 msl bound upper : 1700
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : n90 tower : ewr
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	descent : approach landing : missed approach
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	government : faa
Function	controller : local
Qualification	controller : radar
ASRS Report	279113
Person 2
Affiliation	government : faa
Function	controller : approach
Qualification	controller : radar
Events
Anomaly	conflict : airborne less severe non adherence : published procedure non adherence : required legal separation other anomaly other
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance other other
Consequence	Other
Miss Distance	horizontal : 18000 vertical : 0
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Air carrier X on final following air carrier Y, a B757. Aircraft switched to tower with only 3 mi separation. Air carrier X was sent around by tower. Supervisor notified, no entry made on daily log. Callback conversation with reporter revealed the following information: reporter stated both aircraft were on ILS approachs. Visual approach not in use. Reporter stated N90 constantly ignores wake turbulence separation standards behind B757 and heavy aircraft.

Original NASA ASRS Text

Title: B727 HAD LTSS BEHIND B757. SYS ERROR.

Narrative: ACR X ON FINAL FOLLOWING ACR Y, A B757. ACFT SWITCHED TO TWR WITH ONLY 3 MI SEPARATION. ACR X WAS SENT AROUND BY TWR. SUPVR NOTIFIED, NO ENTRY MADE ON DAILY LOG. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED BOTH ACFT WERE ON ILS APCHS. VISUAL APCH NOT IN USE. RPTR STATED N90 CONSTANTLY IGNORES WAKE TURB SEPARATION STANDARDS BEHIND B757 AND HVY ACFT.

Data retrieved from NASA's ASRS site as of July 2007 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.