Heavy Transport
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Situational Awareness
Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Flight Crew Overcame Equipment Problem; General Maintenance Action
Aircraft
Fume event. intermittent air system odor inflight w/pack 1 MELed INOP & packs 2 & 3 on. Pack outlet temps were the following: #2=33F; #3=133F. Cockpit trim air valve temp=110F. Odor not noticeable when pack #2 temp was below 0 degrees F and cockpit trim air valve below 70 F. Odor was that of dirty socks mixed with an oily smell.Cause: possible air conditioning system contamination from engine bleed air.Suggestions: more frequent maintenance of the air conditioning system.
Heavy Transport aircraft Captain reported 'dirty socks odor mixed with oily smell' during flight.