At the end of a long duty day; a B737-400 flight crew flies the wrong departure.

Attributes
ACN	668027
Time
Date	200508
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : sea.airport
State Reference	WA
Altitude	msl single value : 5000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tracon : s46.tracon tower : bfi.tower
Operator	common carrier : air carrier
Make Model Name	B737-400
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Route In Use	departure sid : sea
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	668027
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	668030
Events
Anomaly	non adherence : clearance non adherence : published procedure other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued new clearance controller : issued advisory
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Departing to the north at sea; crew thought clearance read 'mountain departure;' begun right turn to 070 degrees. Controller asks what departure we were assigned. We stated the 'mountain departure.' we then were told to turn left to a heading of 360 degrees. No conflict or further statement from controller. Upon review of our pre departure clearance on page 2; we were assigned the SEA3 departure. Contributing factors: long duty day; 4 legs; fatigue; previous night's departure for cyyc; we were assigned the mountain departure.

Original NASA ASRS Text

Title: AT THE END OF A LONG DUTY DAY; A B737-400 FLT CREW FLIES THE WRONG DEP.

Narrative: DEPARTING TO THE N AT SEA; CREW THOUGHT CLRNC READ 'MOUNTAIN DEP;' BEGUN R TURN TO 070 DEGS. CTLR ASKS WHAT DEP WE WERE ASSIGNED. WE STATED THE 'MOUNTAIN DEP.' WE THEN WERE TOLD TO TURN L TO A HDG OF 360 DEGS. NO CONFLICT OR FURTHER STATEMENT FROM CTLR. UPON REVIEW OF OUR PDC ON PAGE 2; WE WERE ASSIGNED THE SEA3 DEP. CONTRIBUTING FACTORS: LONG DUTY DAY; 4 LEGS; FATIGUE; PREVIOUS NIGHT'S DEP FOR CYYC; WE WERE ASSIGNED THE MOUNTAIN DEP.

Data retrieved from NASA's ASRS site as of January 2009 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.