Failed recirculation fan causes acrid fumes to enter cabin and forces emergency divert.

Attributes
ACN	674241
Time
Date	200510
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 36000
Environment
Flight Conditions	VMC
Weather Elements	Rain
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	common carrier : air carrier
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	674241
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical other anomaly
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency flight crew : overcame equipment problem
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

At cruise; a recirculation fan failed. Acrid fumes entered cabin and flight deck. Checklist items complied with. Squawked 7700 and declared an emergency with center. Diverted. Overweight landing was uneventful. Crash fire rescue equipment equipment scanned brakes. They were ok. Taxied to gate. Recirculation fan placarded. Flight redispatched.

Original NASA ASRS Text

Title: FAILED RECIRCULATION FAN CAUSES ACRID FUMES TO ENTER CABIN AND FORCES EMER DIVERT.

Narrative: AT CRUISE; A RECIRCULATION FAN FAILED. ACRID FUMES ENTERED CABIN AND FLT DECK. CHKLIST ITEMS COMPLIED WITH. SQUAWKED 7700 AND DECLARED AN EMER WITH CENTER. DIVERTED. OVERWT LNDG WAS UNEVENTFUL. CFR EQUIP SCANNED BRAKES. THEY WERE OK. TAXIED TO GATE. RECIRCULATION FAN PLACARDED. FLT REDISPATCHED.

Data retrieved from NASA's ASRS site as of January 2009 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.