<< >> NASA ASRS Report 270853, May 1994

Corp aircraft encounters wake from 747 at rotation when cleared intersection takeoff behind landing widebody transport.

Attributes
ACN	270853
Time
Date	199405
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : msp
State Reference	MN
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zny
Operator	general aviation : corporate
Make Model Name	King Air C90 E90
Operating Under FAR Part	Part 91
Flight Phase	climbout : takeoff ground : holding
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B747 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	landing other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 150 flight time total : 4000 flight time type : 2000
ASRS Report	270853
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Events
Anomaly	conflict : ground less severe non adherence : required legal separation non adherence : published procedure other anomaly other
Independent Detector	other controllera other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Tower told us to taxi into position and hold after boeing 747 landed. Once there, tower told us to apply takeoff power and be ready for immediate traffic on final. Once B747 was 3/4 clear, tower gave us immediate takeoff. Upon rotation tail of B747 was near edge of runway, but clear. In hindsight, I probably should not have accepted takeoff clearance and taxied clear of runway. Callback conversation with reporter revealed the following information: reporter states that the empennage of the 747 was not completely clear of the runway as they were cleared. Tower told 747 to expedite. They pwred up to clear the runway and reporter aircraft got into wake from the power up. Reporter aircraft was making an intersection takeoff.

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Original NASA ASRS Text

Title: CORP ACFT ENCOUNTERS WAKE FROM 747 AT ROTATION WHEN CLRED INTXN TKOF BEHIND LNDG WDB.

Narrative: TWR TOLD US TO TAXI INTO POS AND HOLD AFTER BOEING 747 LANDED. ONCE THERE, TWR TOLD US TO APPLY TKOF PWR AND BE READY FOR IMMEDIATE TFC ON FINAL. ONCE B747 WAS 3/4 CLR, TWR GAVE US IMMEDIATE TKOF. UPON ROTATION TAIL OF B747 WAS NEAR EDGE OF RWY, BUT CLR. IN HINDSIGHT, I PROBABLY SHOULD NOT HAVE ACCEPTED TKOF CLRNC AND TAXIED CLR OF RWY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THAT THE EMPENNAGE OF THE 747 WAS NOT COMPLETELY CLR OF THE RWY AS THEY WERE CLRED. TWR TOLD 747 TO EXPEDITE. THEY PWRED UP TO CLR THE RWY AND RPTR ACFT GOT INTO WAKE FROM THE PWR UP. RPTR ACFT WAS MAKING AN INTXN TKOF.

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.