<< >> NASA ASRS Report 537194, February 2002

WW23 refuses takeoff clearance behind B757 and is delayed for a B737 and is delayed for a B737 which accepts the departure spacing.

Attributes
ACN	537194
Time
Date	200202
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : las.airport
State Reference	NV
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : las.tower
Operator	general aviation : personal
Make Model Name	IAI1123 Westwind
Operating Under FAR Part	Part 91
Flight Phase	ground : takeoff roll
Flight Plan	IFR
Aircraft 2
Controlling Facilities	tower : las.tower
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	climbout : takeoff
Flight Plan	IFR
Person 1
Affiliation	other
Function	flight crew : first officer
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 50 flight time total : 4500 flight time type : 600
ASRS Report	537194
Person 2
Affiliation	other
Function	flight crew : captain oversight : pic
Events
Anomaly	non adherence : published procedure
Independent Detector	other flight crewa
Resolutory Action	controller : issued new clearance flight crew : took evasive action other
Supplementary
Problem Areas	Flight Crew Human Performance ATC Human Performance Airport
Primary Problem	ATC Human Performance
Situations
ATC Facility	procedure or policy : las.tower

Narrative:

We were cleared for takeoff behind a B757 only 45 seconds after his liftoff. We refused to take off until more time elapsed. Tower canceled takeoff clearance and cleared a B737 to go, then cleared us again and we took off. We hit a bump at 200 ft, but no roll. I feel minimum of 2 mins from liftoff of B757, B767, B747, etc, should be mandated. B757's are notorious for wake turbulence. If we had departed when cleared, we may have been out of control at 100 ft.

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Original NASA ASRS Text

Title: WW23 REFUSES TKOF CLRNC BEHIND B757 AND IS DELAYED FOR A B737 AND IS DELAYED FOR A B737 WHICH ACCEPTS THE DEP SPACING.

Narrative: WE WERE CLRED FOR TKOF BEHIND A B757 ONLY 45 SECONDS AFTER HIS LIFTOFF. WE REFUSED TO TAKE OFF UNTIL MORE TIME ELAPSED. TWR CANCELED TKOF CLRNC AND CLRED A B737 TO GO, THEN CLRED US AGAIN AND WE TOOK OFF. WE HIT A BUMP AT 200 FT, BUT NO ROLL. I FEEL MINIMUM OF 2 MINS FROM LIFTOFF OF B757, B767, B747, ETC, SHOULD BE MANDATED. B757'S ARE NOTORIOUS FOR WAKE TURB. IF WE HAD DEPARTED WHEN CLRED, WE MAY HAVE BEEN OUT OF CTL AT 100 FT.

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.