B757 captain reported noticing a 'dirty socks' odor after takeoff.

Attributes
ACN	1464686
Time
Date	201707
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Initial Climb
Flight Plan	IFR
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Type 7682
Events
Anomaly	Aircraft Equipment Problem Less Severe Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor

Narrative:

We were cleared for takeoff. I advanced the throttles per normal procedure. Once we lifted off; we could smell a slight odor. As we climbed higher; the odor got stronger. It was the worst between 3;500 to 12;000 feet. This odor would be characterized as 'musty; smelly gym socks'. As we climbed higher (through 15;000 feet MSL); the odor went away. I checked with the flight attendants. They said they could smell it too. I considered this a fume event. There was a previous write up for the same occurrence. The last crew stated it happened on descent. We also experienced the same fumes on descent; but not to the extent of departure.

Original NASA ASRS Text

Title: B757 Captain reported noticing a 'dirty socks' odor after takeoff.

Narrative: We were cleared for takeoff. I advanced the throttles per normal procedure. Once we lifted off; we could smell a slight odor. As we climbed higher; the odor got stronger. It was the worst between 3;500 to 12;000 feet. This odor would be characterized as 'musty; smelly gym socks'. As we climbed higher (through 15;000 feet MSL); the odor went away. I checked with the flight attendants. They said they could smell it too. I considered this a fume event. There was a previous write up for the same occurrence. The last crew stated it happened on descent. We also experienced the same fumes on descent; but not to the extent of departure.

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.