Flight crew of an medium large transport air carrier aircraft delayed their tower takeoff clearance to avoid possible wake turbulence from a departing B757 aircraft.

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Attributes
ACN	267258
Time
Date	199403
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : bos
State Reference	MA
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	ground : holding
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	climbout : takeoff climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	267258
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	non adherence : clearance other anomaly other
Independent Detector	other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation
Situations
ATC Facility	procedure or policy : unspecified

Narrative:

Near maximum gross weight takeoff. Preceding aircraft to takeoff was air carrier Y 757. Tower cleared us to takeoff 30 seconds after 757 liftoff. Air carrier Y was only 2 mi away on TCASII screen. Tower personnel are not cognizant of 757 wake turbulence intensity (apparently they do not read published incidents in ASRS). Due to our gross weight. We would have lifted off beyond 757 liftoff point and thus be directly in its wake pattern. Plus, no wind condition would have no dissipation effect. 757 should be given 'heavy' designation and all tower operators educated accordingly.

Original NASA ASRS Text

Title: FLC OF AN MLG ACR ACFT DELAYED THEIR TWR TKOF CLRNC TO AVOID POSSIBLE WAKE TURB FROM A DEPARTING B757 ACFT.

Narrative: NEAR MAX GROSS WT TKOF. PRECEDING ACFT TO TKOF WAS ACR Y 757. TWR CLRED US TO TKOF 30 SECONDS AFTER 757 LIFTOFF. ACR Y WAS ONLY 2 MI AWAY ON TCASII SCREEN. TWR PERSONNEL ARE NOT COGNIZANT OF 757 WAKE TURB INTENSITY (APPARENTLY THEY DO NOT READ PUBLISHED INCIDENTS IN ASRS). DUE TO OUR GROSS WT. WE WOULD HAVE LIFTED OFF BEYOND 757 LIFTOFF POINT AND THUS BE DIRECTLY IN ITS WAKE PATTERN. PLUS, NO WIND CONDITION WOULD HAVE NO DISSIPATION EFFECT. 757 SHOULD BE GIVEN 'HVY' DESIGNATION AND ALL TWR OPERATORS EDUCATED ACCORDINGLY.

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.