Service difficulty report · Relay · Dhav DHC3

Difficulty date
January 10, 2013
Submitted
September 14, 2015
Operation
General aviation
Make and model
Dhav DHC3
Aircraft time
33,178 hours
Engine
Pwa PT6A34
Propeller
Hartzl HCB3TN3
Part
Relay
Part number
MS24192D1
Condition
Misinstalled
Location
Master Relay
Stage of operation
NR
How discovered
9
Nature of condition
W
Precautionary procedure
O

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

What was found

(CAN) AFTER WIRING THE AVIONICS MASTER RELAY, PN MS24192-D1, IAW WITH A LSTC, THE CIRCUIT WAS TESTED AND THE CIRCUIT BREAKER IMMEDIATELY POPPED. UPON INVESTIGATION, IT WAS FOUND THAT THE RELAY WAS WIRED INCORRECTLY DUE TO THE LABELING ON THE RELAY. THE X1 AND X2 WIRES WERE HOOKED UP TO THE RELAY COVER MOUNTING STUDS INSTEAD OF THE X1 AND X2 POSTS CAUSING A DEAD SHORT. THE X1 AND X2 MARKING ON THE RELAY LABEL DO NOT LINE UP WITH THE CORRECT POST BUT INSTEAD LINE UP WITH THE COVER MOUNTING POSTS WHICH CAN LEAD TO IT BEING INCORRECTLY WIRED.