<< >> NASA ASRS Report 1693664, October 2019

B767-300ER flight crew reported 'dirty socks' odor present from takeoff; level off; and descent of varying intensities. Anomaly was documented in logbook and assigned to maintenance.

Attributes
ACN	1693664
Time
Date	201910
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	B767-300 and 300 ER
Operating Under FAR Part	Part 121
Flight Phase	Descent Takeoff
Flight Plan	IFR
Component
Aircraft Component	Air Conditioning Compressor
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine Flight Crew Instrument
Person 2
Function	Pilot Flying First Officer
Qualification	Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument
Events
Anomaly	Aircraft Equipment Problem Critical Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor

Narrative:

While operating aircraft X; left seat captain and I detected a 'dirty socks' odor (non-visible) emitting from the conditioned air system. The odor was present from takeoff through level off; and also during the descent through taxi phase. The odor was most intense during the descent phase but varied in strength and seemed to be strongest during large thrust changes. The flight was conducted safely and we arrived to [destination] with no other issues. He notated the issue in the maintenance logbook as suspected aerosolized engine oil in the bleed air system.

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Original NASA ASRS Text

Title: B767-300ER flight crew reported 'dirty socks' odor present from takeoff; level off; and descent of varying intensities. Anomaly was documented in logbook and assigned to Maintenance.

Narrative: While operating Aircraft X; left seat Captain and I detected a 'dirty socks' odor (non-visible) emitting from the conditioned air system. The odor was present from takeoff through level off; and also during the descent through taxi phase. The odor was most intense during the descent phase but varied in strength and seemed to be strongest during large thrust changes. The flight was conducted safely and we arrived to [destination] with no other issues. He notated the issue in the maintenance logbook as suspected aerosolized engine oil in the bleed air system.

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.