A return land mandated by fumes in cockpit of a B-727-100 freighter during a night operation.

Attributes
ACN	297472
Time
Date	199502
Day	Thu
Local Time Of Day	0001 To 0600
Place
Locale Reference	atc facility : bna
State Reference	TN
Altitude	msl bound lower : 20000 msl bound upper : 29000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zme
Operator	common carrier : air carrier
Make Model Name	B727-100
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude other other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 150 flight time total : 9000 flight time type : 4500
ASRS Report	297472
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical non adherence : published procedure
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency none taken : unable other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Passing FL200 en route to FL330, crew smelled strange odor coming from air conditioning system. Requested leveloff at FL290, smell became more intense irritating eyes, noses and throats. Crew donned oxygen masks and requested expedited descent to bna. Uneventful landing at bna. Maintenance discovered hydraulic system over-serviced, seeping into oversvced system.

Original NASA ASRS Text

Title: A RETURN LAND MANDATED BY FUMES IN COCKPIT OF A B-727-100 FREIGHTER DURING A NIGHT OP.

Narrative: PASSING FL200 ENRTE TO FL330, CREW SMELLED STRANGE ODOR COMING FROM AIR CONDITIONING SYS. REQUESTED LEVELOFF AT FL290, SMELL BECAME MORE INTENSE IRRITATING EYES, NOSES AND THROATS. CREW DONNED OXYGEN MASKS AND REQUESTED EXPEDITED DSCNT TO BNA. UNEVENTFUL LNDG AT BNA. MAINT DISCOVERED HYD SYS OVER-SERVICED, SEEPING INTO OVERSVCED SYS.

Data retrieved from NASA's ASRS site as of July 2007 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.