Leaving seattle, a cpr crew turns before the 8 DME point on the mountain 5 departure.

Attributes
ACN	564148
Time
Date	200210
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sea.airport
State Reference	WA
Altitude	msl single value : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : s46.tracon tower : sea.tower
Operator	general aviation : corporate
Make Model Name	Falcon 50
Operating Under FAR Part	Part 91
Navigation In Use	other other vortac
Flight Phase	climbout : intermediate altitude
Route In Use	departure sid : mountain five
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 75 flight time total : 6000 flight time type : 25
ASRS Report	564148
Person 2
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	non adherence : published procedure non adherence : clearance other spatial deviation
Independent Detector	other controllerb
Resolutory Action	controller : issued advisory flight crew : returned to original clearance
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were departing sea on the mountain 5 SID. When we reached 4000 ft, we started our turn outbound to join our route. We misinterped the SID, and turned out (right) before we reached 8 DME as per the SID. Departure control reminded us, and we corrected. We had departed from runway 34R, and should have briefed each other better on the SID.

Original NASA ASRS Text

Title: LEAVING SEATTLE, A CPR CREW TURNS BEFORE THE 8 DME POINT ON THE MOUNTAIN 5 DEP.

Narrative: WE WERE DEPARTING SEA ON THE MOUNTAIN 5 SID. WHEN WE REACHED 4000 FT, WE STARTED OUR TURN OUTBOUND TO JOIN OUR RTE. WE MISINTERPED THE SID, AND TURNED OUT (R) BEFORE WE REACHED 8 DME AS PER THE SID. DEP CTL REMINDED US, AND WE CORRECTED. WE HAD DEPARTED FROM RWY 34R, AND SHOULD HAVE BRIEFED EACH OTHER BETTER ON THE SID.

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.