Captain reported flight attendant notification of 'chemical or dirty socks' smell during pushback fo...

Attributes
ACN	1659748
Time
Date	201906
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Light	Night
Aircraft 1
Make Model Name	Large Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Flight Plan	IFR
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Flight Deck / Cabin / Aircraft Event Illness Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor

Narrative:

Prior to engine start during push back; the flight attendants called and reported a 'chemical smell or dirty sock smell.' we elected to terminate the push back and were pulled back into the gate. We turned off the packs and the APU bleed air. We deplaned the passengers and crew and accomplished the QRH for smoke odor/fumes. While exiting one passenger began having symptoms of nausea and vomited. We called paramedics. After deplaning 2 fas began having headaches and paramedics treated them in the terminal. No one was transported to the hospital.

Original NASA ASRS Text

Title: Captain reported Flight Attendant notification of 'chemical or dirty socks' smell during pushback for departure. Crew returned to gate for Maintenance. Deplaned with a passenger and two flight attendants experiencing health issues.

Narrative: Prior to engine start during push back; the flight attendants called and reported a 'chemical smell or dirty sock smell.' We elected to terminate the push back and were pulled back into the gate. We turned off the packs and the APU bleed air. We deplaned the passengers and crew and accomplished the QRH for smoke odor/fumes. While exiting one passenger began having symptoms of nausea and vomited. We called Paramedics. After deplaning 2 FAs began having headaches and paramedics treated them in the terminal. No one was transported to the hospital.

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.

Captain reported flight attendant notification of 'chemical or dirty socks' smell during pushback for departure. Crew returned to gate for maintenance. Deplaned with a passenger and two flight attendants experiencing health issues.