An air carrier crew failed to cross check the filed flight plan with the route entered in the FMC and were flying an incorrect memorized route previously flown by the First Officer.
Synopsis
An air carrier crew failed to cross check the filed flight plan with the route entered in the FMC and were flying an incorrect memorized route previously flown by the First Officer.
Narrative
Flight to DFW. Received clearance over radio (no PDC). Clearance was as filed; clearance on flight plan read ...JAMEY PER IRW UKW9 to DFW. Takeoff and departure went fine. After JAMEY; we went direct to IRW. ATC questioned our routing. We said JAMEY TO IRW. ATC then cleared us to IRW. They also informed us that our proper clearance was JAMEY PER IRW. ATC said there was no problem or conflict. The Captain then checked the clearance on the flight plan; this is when we realized our mistake. I put the clearance in the box. Both of us missed the mistake while reading through the route page and the legs page before the starting engine checklist. I believe this is a case of seeing what you want to see. I have been flying this trip most of the month. Most of the time the clearance is direct routing (no airways). I think I honestly missed PER and looked at IRW as the next fix after JAMEY. Although this incident did not seem to create a problem for ATC (they cleared us right away to IRW); I realize how important it is to get it right even if you have to double and triple check the clearance after the required checklists are done.
Second reporter narrative
We did not do a leg check or a clearance cross check. ATC then asked if we are navigating to PER. We said no we are flying our filed flight plan; only to find out we filed over PER. ATC then cleared us to TUL and flight plan route. The First Officer's familiarity on the route caused us not to check; he said its ICT to TUL all month. So without checking we took off direct TUL.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.