A dash 8 immediately after takeoff returned to the field due to #2 engine fuel filter bypass light illuminated caused by a failed pressure switch.

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Attributes
ACN	478310
Time
Date	200007
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : zzz.tracon
Operator	common carrier : air carrier
Make Model Name	Dash 8-100
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Route In Use	departure : other published ifr departure
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 2200 flight time type : 150
ASRS Report	478310
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : filter by pass light other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance flight crew : diverted to another airport
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

After takeoff, #2 fuel filter by-pass light came on. We advised ATC and returned for landing without incidence. Callback conversation with reporter revealed the following information: the reporter stated the aircraft was a dehavilland dash 8-100 with pratt and whitney pwc PW122 engines. The reporter said the filter bypass pressure switch failed causing a false warning.

Original NASA ASRS Text

Title: A DASH 8 IMMEDIATELY AFTER TKOF RETURNED TO THE FIELD DUE TO #2 ENG FUEL FILTER BYPASS LIGHT ILLUMINATED CAUSED BY A FAILED PRESSURE SWITCH.

Narrative: AFTER TKOF, #2 FUEL FILTER BY-PASS LIGHT CAME ON. WE ADVISED ATC AND RETURNED FOR LNDG WITHOUT INCIDENCE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE ACFT WAS A DEHAVILLAND DASH 8-100 WITH PRATT AND WHITNEY PWC PW122 ENGS. THE RPTR SAID THE FILTER BYPASS PRESSURE SWITCH FAILED CAUSING A FALSE WARNING.

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.