An air carrier airbus crew flying the mountain 5 departure (vector) from sea, wa, turns before the required 8 DME fix to the published vector heading.

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Attributes
ACN	564105
Time
Date	200210
Day	Tue
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : sea.airport
State Reference	WA
Altitude	msl single value : 4000
Environment
Flight Conditions	IMC
Light	Dawn
Aircraft 1
Controlling Facilities	tracon : s46.tracon
Operator	common carrier : air carrier
Make Model Name	A310
Operating Under FAR Part	Part 121
Navigation In Use	other
Route In Use	departure sid : moutain 5
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 90 flight time total : 10000 flight time type : 2000
ASRS Report	564105
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 90 flight time total : 5600 flight time type : 1500
ASRS Report	564110
Events
Anomaly	altitude deviation : crossing restriction not met non adherence : clearance non adherence : published procedure other spatial deviation
Independent Detector	other controllerb
Resolutory Action	none taken : detected after the fact
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Departed sea via mountain 5 SID. This SID requires crossing 341 degree radial sea above 4000 ft at 8 DME and then turn to 070 degree heading for vectors. FMS/navigation function started turn 070 degrees approximately 6.5 DME, rolled out 7.2 - 7.4 DME on 070 degree radial. Controller correctly stated we should not have started turn until 8 DME from sea. Use of navigation fine for departure so long as turn to 070 degrees is not allowed to start until 8 DME. Aircraft turn to 070 degrees will vary and may remain within noise abatement (SID) corridor or, as in this case, may turn too early. Recommend note on SID for FMS equipped aircraft. To not use navigation for departure due to possible early turn. Supplemental information from acn 564110: this situation results from reliance on FMS to fly the correct course. Need a way to specify points as required flyover points. Also, the perception that if the FMS says it's time to turn -- turn! Callback conversation with reporter acn 564105 revealed the following information: the departure is in the FMS database and was not manually loaded by the crew.

Original NASA ASRS Text

Title: AN ACR AIRBUS CREW FLYING THE MOUNTAIN 5 DEP (VECTOR) FROM SEA, WA, TURNS BEFORE THE REQUIRED 8 DME FIX TO THE PUBLISHED VECTOR HDG.

Narrative: DEPARTED SEA VIA MOUNTAIN 5 SID. THIS SID REQUIRES XING 341 DEG RADIAL SEA ABOVE 4000 FT AT 8 DME AND THEN TURN TO 070 DEG HDG FOR VECTORS. FMS/NAV FUNCTION STARTED TURN 070 DEGS APPROX 6.5 DME, ROLLED OUT 7.2 - 7.4 DME ON 070 DEG RADIAL. CTLR CORRECTLY STATED WE SHOULD NOT HAVE STARTED TURN UNTIL 8 DME FROM SEA. USE OF NAV FINE FOR DEP SO LONG AS TURN TO 070 DEGS IS NOT ALLOWED TO START UNTIL 8 DME. ACFT TURN TO 070 DEGS WILL VARY AND MAY REMAIN WITHIN NOISE ABATEMENT (SID) CORRIDOR OR, AS IN THIS CASE, MAY TURN TOO EARLY. RECOMMEND NOTE ON SID FOR FMS EQUIPPED ACFT. TO NOT USE NAV FOR DEP DUE TO POSSIBLE EARLY TURN. SUPPLEMENTAL INFO FROM ACN 564110: THIS SIT RESULTS FROM RELIANCE ON FMS TO FLY THE CORRECT COURSE. NEED A WAY TO SPECIFY POINTS AS REQUIRED FLYOVER POINTS. ALSO, THE PERCEPTION THAT IF THE FMS SAYS IT'S TIME TO TURN -- TURN! CALLBACK CONVERSATION WITH RPTR ACN 564105 REVEALED THE FOLLOWING INFO: THE DEP IS IN THE FMS DATABASE AND WAS NOT MANUALLY LOADED BY THE CREW.

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.