A CL65 in descent at 10000 ft. On auxiliary power unit start; jet 'a' fuel fumes through the air con...

Attributes
ACN	686027
Time
Date	200601
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 10000
Environment
Flight Conditions	IMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : zzz.tracon
Operator	common carrier : air carrier
Make Model Name	Regional Jet CL65 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	descent : approach
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 250 flight time total : 7860 flight time type : 31
ASRS Report	686027
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical other anomaly
Independent Detector	other flight crewa other flight crewb
Resolutory Action	other
Consequence	other
Supplementary
Problem Areas	Aircraft Chart Or Publication
Primary Problem	Aircraft

Narrative:

Upon descent into ZZZ; APU produced jet a fumes from air conditioning system immediately after start-up. We then immediately shut down the APU and fumes dissipated. Landed in ZZZ minutes later with no further incident. Maintenance called; APU inspected. APU deferred.callback conversation with reporter revealed the following information: the reporter stated the airplane was in descent at 10000 ft; 20 miles from the airport and the auxiliary power unit was started and selected for pneumatics for the air conditioning packs. The fumes from jet a fuel were in the cabin and cockpit almost immediately and the auxiliary power unit was shut down. The reporter indicated that on landing; maintenance control was called and advised of the fuel fumes in the cabin and cockpit and the decision was made to defer the auxiliary power unit as inoperative per the MEL. The auxiliary power unit was a garrett gtcp 36-150. The reporter stated there was one other incident in the fleet of fuel fumes entering the cabin and cockpit but has no information on the fix on the previous incident and this incident.

Original NASA ASRS Text

Title: A CL65 IN DSCNT AT 10000 FT. ON AUX POWER UNIT START; JET 'A' FUEL FUMES THROUGH THE AIR CONDITIONING SYSTEM WERE DETECTED IN THE COCKPIT AND CABIN ALMOST IMMEDIATELY. THE APU WAS SHUT DOWN IMMEDIATELY AND THE FUMES DISSIPATED.

Narrative: UPON DSCNT INTO ZZZ; APU PRODUCED JET A FUMES FROM AIR CONDITIONING SYSTEM IMMEDIATELY AFTER START-UP. WE THEN IMMEDIATELY SHUT DOWN THE APU AND FUMES DISSIPATED. LANDED IN ZZZ MINUTES LATER WITH NO FURTHER INCIDENT. MAINT CALLED; APU INSPECTED. APU DEFERRED.CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE AIRPLANE WAS IN DSCNT AT 10000 FT; 20 MILES FROM THE ARPT AND THE AUX POWER UNIT WAS STARTED AND SELECTED FOR PNEUMATICS FOR THE AIR CONDITIONING PACKS. THE FUMES FROM JET A FUEL WERE IN THE CABIN AND COCKPIT ALMOST IMMEDIATELY AND THE AUX POWER UNIT WAS SHUT DOWN. THE RPTR INDICATED THAT ON LNDG; MAINT CTL WAS CALLED AND ADVISED OF THE FUEL FUMES IN THE CABIN AND COCKPIT AND THE DECISION WAS MADE TO DEFER THE AUX POWER UNIT AS INOP PER THE MEL. THE AUX POWER UNIT WAS A GARRETT GTCP 36-150. THE RPTR STATED THERE WAS ONE OTHER INCIDENT IN THE FLEET OF FUEL FUMES ENTERING THE CABIN AND COCKPIT BUT HAS NO INFO ON THE FIX ON THE PREVIOUS INCIDENT AND THIS INCIDENT.

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.

A CL65 in descent at 10000 ft. On auxiliary power unit start; jet 'a' fuel fumes through the air conditioning system were detected in the cockpit and cabin almost immediately. The APU was shut down immediately and the fumes dissipated.