Service difficulty report · Electrical Sys · Urocop EC130B4

Difficulty date
July 1, 2009
Submitted
October 23, 2009
Operation
General aviation
Make and model
Urocop EC130B4
Aircraft time
1,640 hours
Engine
Tmeca ARRIUS2B1
Part
Electrical Sys
Condition
Malfunctioned
Location
Carousel Switch
Part time
1,730 hours
Component
Carousel Switch
Component part number
83450001
Stage of operation
IN
How discovered
9
Nature of condition
S
Precautionary procedure
K

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

What was found

INVESTIGATION REVEALED THAT THE CAROUSEL RELAY PROVIDES AN UNANTICIPATED 6 TO 9 VOLTS VDC TO PIN C OF THE UTILITY CONNECTION ON THE BELLY OF THE AIRFRAME WHEN IT SHOULD ONLY BE SUPPLING 28 VDC TO PIN E OF THE CONNECTION. THIS ERRANT VOLTAGE INS`T ENOUGH TO OPEN A WATER BUCKET BUT IT HAS BEEN DEMONSTRATED TO OPEN A REMOTE HOOK. AN EMERGENCY NOTICE HAS BEEN SENT TO ALL COMPANY PILOTS INSTRUCTING THEM TO USE EXTREME CAUTION TO AVOID ACTIVATION OF THE CAROUSEL SWITCH. MFG HAS BEEN INFORMED OF THIS SITUATATION.

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