A md-82 wheel well hydraulic component 'O' ring failed on takeoff allowing hydraulic fluid to enter the aircraft air conditioning system. The odor made the pilots light headed so an emergency was declared and the flight returned to the departure airport.

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Attributes
ACN	1038218
Time
Date	201209
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Daylight
Aircraft 1
Make Model Name	MD-83
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Component
Aircraft Component	Hydraulic System Lines Connectors Fittings
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Less Severe Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor Flight Deck / Cabin / Aircraft Event Illness

Narrative:

On takeoff we noticed an odor like chlorine at 110 KTS. By 1;500 ft; it was more like turpentine. We declared an emergency; accomplished the QRH; smoke/fire/fumes checklist and returned to the airport for an overweight landing.

Original NASA ASRS Text

Title: A MD-82 wheel well hydraulic component 'O' ring failed on takeoff allowing hydraulic fluid to enter the aircraft air conditioning system. The odor made the pilots light headed so an emergency was declared and the flight returned to the departure airport.

Narrative: On takeoff we noticed an odor like Chlorine at 110 KTS. By 1;500 FT; it was more like turpentine. We declared an emergency; accomplished the QRH; smoke/fire/fumes checklist and returned to the airport for an overweight landing.

Data retrieved from NASA's ASRS site as of July 2013 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.