B737-400 flight crew fail to note revised routing on their ACARS pre departure clearance printout.

Attributes
ACN	696523
Time
Date	200605
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : hcm.vortac
State Reference	VA
Altitude	msl single value : 34000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc.artcc
Operator	common carrier : air carrier
Make Model Name	B737-400
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : level
Route In Use	enroute airway : j193.airway
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : flight engineer pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 25 flight time total : 19121 flight time type : 6048
ASRS Report	696523
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	non adherence : clearance other spatial deviation
Independent Detector	other controllera
Resolutory Action	controller : issued advisory flight crew : returned to intended or assigned course
Consequence	faa : reviewed incident with flight crew
Supplementary
Problem Areas	Flight Crew Human Performance FAA Chart Or Publication
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

Center asked if we were proceeding direct to iso. We said we would if he wished. Controller then said he had him direct iso; did we have that? After reviewing flight pan and pre departure clearance; we discovered pre departure clearance showed 'hcm iso' as a revision and; therefore; the route we should have been flying; not flight plan route of...hcm J193 weavr J121 iso.... As cleared; we turned direct iso immediately after verifying ZDC still wanted us to do so.

Original NASA ASRS Text

Title: B737-400 FLT CREW FAIL TO NOTE REVISED ROUTING ON THEIR ACARS PDC PRINTOUT.

Narrative: CTR ASKED IF WE WERE PROCEEDING DIRECT TO ISO. WE SAID WE WOULD IF HE WISHED. CTLR THEN SAID HE HAD HIM DIRECT ISO; DID WE HAVE THAT? AFTER REVIEWING FLT PAN AND PDC; WE DISCOVERED PDC SHOWED 'HCM ISO' AS A REVISION AND; THEREFORE; THE RTE WE SHOULD HAVE BEEN FLYING; NOT FLT PLAN RTE OF...HCM J193 WEAVR J121 ISO.... AS CLRED; WE TURNED DIRECT ISO IMMEDIATELY AFTER VERIFYING ZDC STILL WANTED US TO DO SO.

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.