<< >> NASA ASRS Report 144914, May 1990

Flight crew of corp jet departing clt on the hornet SID initiates turn direct hmv after crossing the 50 DME arc of clt, even though they were not so cleared. Flight crew misunderstood SID chart and confused instruction to expect a vector for an actual instruction to proceed on course.

Attributes
ACN	144914
Time
Date	199005
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : clt
State Reference	NC
Altitude	msl bound lower : 22000 msl bound upper : 22000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : ztl
Operator	general aviation : corporate
Make Model Name	Light Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Route In Use	departure sid : sid
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 300 flight time total : 12200 flight time type : 9000
ASRS Report	144914
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	non adherence : published procedure other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were cleared from clt to grr via the hornet 1 SID and the stann vector gate, then direct hmv VOR as filed (this was direct grr). We were vectored to, and we intercepted, the clt 347 degree right. We flew the 347 degree right to the 50 mi fix. In the absence of any other guidance, such as an expect clearance, we went direct hmv. ZTL advised us after about 10 mi that we should have stayed no the 347 degree right until we were vectored or given other clearance. I have included a copy of the SID and have highlighted where the misunderstanding could have occurred. The center controller was very nice in his advisory and I do not believe a traffic conflict arose. I still believe this departure leaves room for interpretation and confusion.

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Original NASA ASRS Text

Title: FLT CREW OF CORP JET DEPARTING CLT ON THE HORNET SID INITIATES TURN DIRECT HMV AFTER CROSSING THE 50 DME ARC OF CLT, EVEN THOUGH THEY WERE NOT SO CLEARED. FLT CREW MISUNDERSTOOD SID CHART AND CONFUSED INSTRUCTION TO EXPECT A VECTOR FOR AN ACTUAL INSTRUCTION TO PROCEED ON COURSE.

Narrative: WE WERE CLRED FROM CLT TO GRR VIA THE HORNET 1 SID AND THE STANN VECTOR GATE, THEN DIRECT HMV VOR AS FILED (THIS WAS DIRECT GRR). WE WERE VECTORED TO, AND WE INTERCEPTED, THE CLT 347 DEG R. WE FLEW THE 347 DEG R TO THE 50 MI FIX. IN THE ABSENCE OF ANY OTHER GUIDANCE, SUCH AS AN EXPECT CLRNC, WE WENT DIRECT HMV. ZTL ADVISED US AFTER ABOUT 10 MI THAT WE SHOULD HAVE STAYED NO THE 347 DEG R UNTIL WE WERE VECTORED OR GIVEN OTHER CLRNC. I HAVE INCLUDED A COPY OF THE SID AND HAVE HIGHLIGHTED WHERE THE MISUNDERSTANDING COULD HAVE OCCURRED. THE CENTER CTLR WAS VERY NICE IN HIS ADVISORY AND I DO NOT BELIEVE A TFC CONFLICT AROSE. I STILL BELIEVE THIS DEP LEAVES ROOM FOR INTERP AND CONFUSION.

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.