Service difficulty report · Pressure Switch · Saab 340B

Difficulty date
December 9, 2008
Submitted
October 23, 2009
Operation
General aviation
Make and model
Saab 340B
Aircraft time
37,839 hours
Engine
Ge CT75A2
Propeller
Rotol R3894123F25
Part
Pressure Switch
Part number
GPP125012
Condition
Malfunctioned
Location
Hyd Pump
Stage of operation
IN
How discovered
V
Nature of condition
O
Precautionary procedure
K

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

HYD PRESSURE SWITCH CONTROLLING THE HYD PUMP WOULD NOT ACTUATE THE PUMP UNTIL THE HYD PRESSURE DROPPED BELOW 1900 PSI. THE HYD PRESSURE WARNING LIGHT ILLUMINATED AT 2100 PSI. THIS IS THE SECOND SWITCH TO FAIL AS THE PREVIOUS ONE HAD 196 HOURS ON IT. THE BATCH DATE ON THE BOX IS DECEMBER 24, 2007.

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