Military T44 pilot attempting to avoid wake turbulence is asked to exit the runway, then gets permis...

Attributes
ACN	342652
Time
Date	199607
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : las
State Reference	NV
Altitude	agl bound lower : 2000 agl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : las
Operator	other
Make Model Name	Ute
Operating Under FAR Part	other : other
Flight Phase	climbout : takeoff climbout : initial
Route In Use	departure sid : sid
Flight Plan	IFR
Person 1
Affiliation	government : military
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : atp pilot : instrument
Experience	flight time last 90 days : 158 flight time total : 2378 flight time type : 1231
ASRS Report	342652
Person 2
Affiliation	government : military
Function	flight crew : single pilot
Qualification	pilot : military
Events
Anomaly	conflict : airborne less severe other spatial deviation
Independent Detector	other controllera
Resolutory Action	flight crew : became reoriented other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Clearance was received from las clearance which stated 'after departure turn right heading 270 degrees proceed on meade 1 departure, peach springs transition. Student in left seat had 270 degrees set on heading bug. I had 360 degrees for meade 1 departure set in my flight director. We were given takeoff clearance on runway 19L with a wake turbulence caution from departing heavy traffic on runway 25. I replied to tower that we needed a couple of mins delay for wake turbulence. Tower then canceled takeoff clearance and informed us to exit the runway. After exiting the runway I informed tower that I could takeoff if I could get an immediate turn out. Tower stated 'expect that.' subsequently I was again cleared for takeoff. Once we became airborne, it was evident that my student was not going to start an immediate turn to the right, so I took the controls and started the turn. With the thought of wake turbulence still weighing heavily on me, I turned (mistakenly) through the 270 degree heading towards 360 degrees. Tower called helicopter traffic at my 2-3 O'clock position low, which I visually picked up. Then I was handed off to departure. Las departure stated that I needed to be on the 270 degree heading. I immediately started a turn to the left. While in the turn, departure stated 'turn left immediately to 250 degrees for aircraft avoidance.' by the time they finished saying this, I was rolling out on a 250 degree heading. I never saw an aircraft in my vicinity while in the turn or after rolling out. I believe that if there had been no confusion on the ground over wake turbulence during my initial takeoff clearance and the student in the left seat had started an early turn, this may not have occurred. It would have also been extremely helpful if tower could have restated my turn-out instructions upon issuing takeoff clearance. The major factor causing me to turn through 270 degrees was the concern over wake turbulence, which led to a mental error on a fairly complicated 'standard instrument departure.'

Original NASA ASRS Text

Title: MIL T44 PLT ATTEMPTING TO AVOID WAKE TURB IS ASKED TO EXIT THE RWY, THEN GETS PERMISSION TO DEPART WITH IMMEDIATE TURN. TURNS BEYOND CLRNC HEADING AND IS GIVEN IMMEDIATE TURN BACK BY ATC.

Narrative: CLRNC WAS RECEIVED FROM LAS CLRNC WHICH STATED 'AFTER DEP TURN R HDG 270 DEGS PROCEED ON MEADE 1 DEP, PEACH SPRINGS TRANSITION. STUDENT IN L SEAT HAD 270 DEGS SET ON HDG BUG. I HAD 360 DEGS FOR MEADE 1 DEP SET IN MY FLT DIRECTOR. WE WERE GIVEN TKOF CLRNC ON RWY 19L WITH A WAKE TURB CAUTION FROM DEPARTING HVY TFC ON RWY 25. I REPLIED TO TWR THAT WE NEEDED A COUPLE OF MINS DELAY FOR WAKE TURB. TWR THEN CANCELED TKOF CLRNC AND INFORMED US TO EXIT THE RWY. AFTER EXITING THE RWY I INFORMED TWR THAT I COULD TKOF IF I COULD GET AN IMMEDIATE TURN OUT. TWR STATED 'EXPECT THAT.' SUBSEQUENTLY I WAS AGAIN CLRED FOR TKOF. ONCE WE BECAME AIRBORNE, IT WAS EVIDENT THAT MY STUDENT WAS NOT GOING TO START AN IMMEDIATE TURN TO THE R, SO I TOOK THE CTLS AND STARTED THE TURN. WITH THE THOUGHT OF WAKE TURB STILL WEIGHING HEAVILY ON ME, I TURNED (MISTAKENLY) THROUGH THE 270 DEG HDG TOWARDS 360 DEGS. TWR CALLED HELI TFC AT MY 2-3 O'CLOCK POS LOW, WHICH I VISUALLY PICKED UP. THEN I WAS HANDED OFF TO DEP. LAS DEP STATED THAT I NEEDED TO BE ON THE 270 DEG HDG. I IMMEDIATELY STARTED A TURN TO THE L. WHILE IN THE TURN, DEP STATED 'TURN L IMMEDIATELY TO 250 DEGS FOR ACFT AVOIDANCE.' BY THE TIME THEY FINISHED SAYING THIS, I WAS ROLLING OUT ON A 250 DEG HDG. I NEVER SAW AN ACFT IN MY VICINITY WHILE IN THE TURN OR AFTER ROLLING OUT. I BELIEVE THAT IF THERE HAD BEEN NO CONFUSION ON THE GND OVER WAKE TURB DURING MY INITIAL TKOF CLRNC AND THE STUDENT IN THE L SEAT HAD STARTED AN EARLY TURN, THIS MAY NOT HAVE OCCURRED. IT WOULD HAVE ALSO BEEN EXTREMELY HELPFUL IF TWR COULD HAVE RESTATED MY TURN-OUT INSTRUCTIONS UPON ISSUING TKOF CLRNC. THE MAJOR FACTOR CAUSING ME TO TURN THROUGH 270 DEGS WAS THE CONCERN OVER WAKE TURB, WHICH LED TO A MENTAL ERROR ON A FAIRLY COMPLICATED 'STANDARD INST DEP.'

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.

Military T44 pilot attempting to avoid wake turbulence is asked to exit the runway, then gets permission to depart with immediate turn. Turns beyond clearance heading and is given immediate turn back by ATC.