Small transport X deviation from SID heading.

Attributes
ACN	300310
Time
Date	199503
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : sna
State Reference	CA
Altitude	msl bound lower : 2000 msl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : sna tower : sna
Operator	general aviation : personal
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Operating Under FAR Part	Part 91
Flight Phase	climbout : initial
Route In Use	departure other departure sid : sid
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 7000 flight time type : 600
ASRS Report	300310
Person 2
Affiliation	government : faa
Function	controller : local
Qualification	controller : non radar
Events
Anomaly	non adherence : published procedure other spatial deviation
Independent Detector	other controllera
Resolutory Action	flight crew : returned to intended course or assigned course other
Consequence	faa : reviewed incident with flight crew
Supplementary
Primary Problem	ATC Human Performance
Air Traffic Incident	other

Narrative:

Small transport X departed sna on runway 19R. Tower cleared us for takeoff behind a 757. We had advised prior to clearance that we would like to offset to the right to avoid wake turbulence. That was ok'ed. We repeated offset request when cleared for takeoff. After takeoff we did offset to the right, keeping the 757 in sight, checked in with socal departure heading 200 degrees. Upon check-in, advised ATC that we were offset to the right and advised our heading deviation from the SID (175 degrees) because of wake turbulence avoidance. They pointed out traffic at 12 O'clock and 2000 ft. We called traffic in sight and climbing well clear. We were then cleared our discretion to 175 degree heading. We did turn and continued the SID (musel 5). The next frequency asked us to contact socal upon landing. Their response was that they had never been told by the tower of our deviation request. They told us we should try to stay on the SID because of local traffic either side of that track and noise monitoring equipment as well. They recommended declining a takeoff clearance in this type of problem. This is not always practical in such a busy, high density airline environment.

Original NASA ASRS Text

Title: SMT X DEV FROM SID HDG.

Narrative: SMT X DEPARTED SNA ON RWY 19R. TWR CLRED US FOR TKOF BEHIND A 757. WE HAD ADVISED PRIOR TO CLRNC THAT WE WOULD LIKE TO OFFSET TO THE R TO AVOID WAKE TURB. THAT WAS OK'ED. WE REPEATED OFFSET REQUEST WHEN CLRED FOR TKOF. AFTER TKOF WE DID OFFSET TO THE R, KEEPING THE 757 IN SIGHT, CHKED IN WITH SOCAL DEP HDG 200 DEGS. UPON CHK-IN, ADVISED ATC THAT WE WERE OFFSET TO THE R AND ADVISED OUR HDG DEV FROM THE SID (175 DEGS) BECAUSE OF WAKE TURB AVOIDANCE. THEY POINTED OUT TFC AT 12 O'CLOCK AND 2000 FT. WE CALLED TFC IN SIGHT AND CLBING WELL CLR. WE WERE THEN CLRED OUR DISCRETION TO 175 DEG HDG. WE DID TURN AND CONTINUED THE SID (MUSEL 5). THE NEXT FREQ ASKED US TO CONTACT SOCAL UPON LNDG. THEIR RESPONSE WAS THAT THEY HAD NEVER BEEN TOLD BY THE TWR OF OUR DEV REQUEST. THEY TOLD US WE SHOULD TRY TO STAY ON THE SID BECAUSE OF LCL TFC EITHER SIDE OF THAT TRACK AND NOISE MONITORING EQUIP AS WELL. THEY RECOMMENDED DECLINING A TKOF CLRNC IN THIS TYPE OF PROB. THIS IS NOT ALWAYS PRACTICAL IN SUCH A BUSY, HIGH DENSITY AIRLINE ENVIRONMENT.

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.