Service difficulty report · Pressure Switch · Dhav DHC6

Difficulty date
February 2, 2004
Submitted
March 1, 2004
Operation
General aviation
Make and model
Dhav DHC6
Part
Pressure Switch
Part number
6607P953
Condition
Out Of Tolerance
Location
Hyd System
Stage of operation
NR
How discovered
9
Nature of condition
O
Precautionary procedure
O

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

What was found

(CAN) PRESSURE SWITCH HAS A CALIBRATION VARIANCE THAT FALLS OUTSIDE OF THE DRAWING SPECIFICATION. THE ACTUATION OF THE UNIT HAS A TIGHTER TOLERANCE FROM ACTUATION, THAN SPECIFIED. THE SWITCH IS DESIGNED TO DEACTUATE, ON DECREASING PRESSURE, AT A VALUE 150 TO 300 PSI BELOW THE ACTUATION POINT. (DEACTUATION IS LOWER THAN THE 150 PSI BENCH MARK. THIS, IN NO WAY, HAS AFFECTED THE RELIABILITY OF THE UNIT.) THERE IS NO CONCERN OF UNITS FUNCTIONALITY OR QUALITY CHARACTERISTICS. IF THE TIGHTER TOLERANCE IS ACCEPTABLE/PREFERRED, CUSTOMERS MAY CONTINUE TO USE THEM.