Air carrier flight crew reported a fume event described as 'Dirty socks' during preflight. After Maintenance performed checks; the aircraft was removed from service.
Synopsis
Air carrier flight crew reported a fume event described as 'Dirty socks' during preflight. After Maintenance performed checks; the aircraft was removed from service.
Narrative
Upon arriving at Aircraft X in ZZZ; the FO (First Officer) found the APU running and the APU bleed off. After ascertaining that the ground air was not connected; FO turned on the APU bleed to cool the aircraft. Immediately; the FO smelled dirty sock and announced that. The CA (Captain); who was entering the cockpit behind the FO; remarked that she immediately smelled it; also. The CA then walked back through the aircraft and determined that the smell permeated the whole plane. The inflight crew had not yet arrived at the plane; it was just the pilots at this point. We turned the bleed off; called Maintenance Control; and the CA wrote up a fume event in the aircraft logbook and began work on the required fume report. We probably did not get out of the airplane as quickly as we should have. When the tech arrived; he turned the bleed back on to perform his checks; and we exited the aircraft to reduce our exposure. The tech came up the jet bridge to chat with us and verified that in his opinion it was a valid fume event and the aircraft would be taken out of service. CA experienced some headache symptoms; FO had a bit of irritated sinus/throat feelings; but both of us felt well enough to continue when Operations swapped airplanes about an hour later. We proceeded to destination uneventfully.
Second reporter narrative
[Report narrative contained no additional information.]
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.