B777 captain reported 'dirty socks' odor in passenger cabin which dissipated.

Attributes
ACN	1669195
Time
Date	201907
Aircraft 1
Make Model Name	B777 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 248.75 Flight Crew Total 15334.82 Flight Crew Type 8230.55
Events
Anomaly	Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor

Narrative:

Wet dog/dirty sock very faint odor during cruise flight. Turned off both recirculating fans. Immediately got 2 EICAS messages said smoke detected in both pilot and flight attendants crew rest areas. Restored recirculated fan operation and EICAS messages went away. Purser called about the warning on her panel. Inspected crew rest areas; no smoke or odor found. After block in at ZZZ with engines shut down; strong wet dog/dirty sock odor came back. During deplaning; purser and other flight attendants said aft cabin area smelled like jet fuel. This seemed to be a separate issue; but sent this additional ACARS write up in after block in and verbally notified on radio. Phone call to [maintenance control] was made later to add details verbally.

Original NASA ASRS Text

Title: B777 Captain reported 'dirty socks' odor in passenger cabin which dissipated.

Narrative: Wet dog/dirty sock very faint odor during cruise flight. Turned off both recirculating fans. Immediately got 2 EICAS messages said smoke detected in both pilot and flight attendants crew rest areas. Restored recirculated fan operation and EICAS messages went away. Purser called about the warning on her panel. Inspected crew rest areas; no smoke or odor found. After block in at ZZZ with engines shut down; strong wet dog/dirty sock odor came back. During deplaning; Purser and other flight attendants said aft cabin area smelled like jet fuel. This seemed to be a separate issue; but sent this additional ACARS write up in after block in and verbally notified on radio. Phone call to [Maintenance Control] was made later to add details verbally.

Data retrieved from NASA's ASRS site 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.