B737-800
Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP)
Flight Crew Total 16000
Aircraft Equipment Problem Less Severe; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Air Traffic Control Provided Assistance; Flight Crew Returned To Departure Airport; Flight Crew Landed in Emergency Condition; Flight Crew Requested ATC Assistance / Clarification
Aircraft
First leg of trip. Captain's leg. AML (Maintenance Log) Review showed aircraft had just had an engine change. On takeoff; noticed odor/ fumes. As climbing out it became stronger. Cabin crew called to say they had odor/ fumes in the cabin. I assumed Pilot Flying duties while Captain coordinated with Cabin; OPS; and ATC. [ATC was notified of the situation]; CFR (crash; fire; rescue) notified. As flight progressed; odor/ fumes became less pronounced. Landed on XX; CFR said no heat signatures; followed us to gate. Normal deplaning. Cause: Engine change. Mechanic that met us said Maintenance was supposed to have done a high power run up- not sure if it was completed. Suggestions: Ensure aircraft is airworthy after major maintenance.
B737-800 First Officer reported an air return due to a fume event during initial climb.