Service difficulty report · Control Unit · Dhav DHC8202

Difficulty date
January 28, 2005
Submitted
March 3, 2005
Operation
General aviation
Make and model
Dhav DHC8202
Aircraft time
7,244 hours
Engine
Pwa PW123D
Propeller
Hamstd 14SF23
Part
Control Unit
Part number
2401
Part serial
TR00328
Condition
Malfunctioned
Location
Pulse Light
Stage of operation
IN
How discovered
O
Nature of condition
M, B
Precautionary procedure
K

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

What was found

(CAN) THE TECH WAS WORKING ON A DEICE PROBLEM AND WHILE STANDING OUTSIDE THE AC SUDDENLY SAW THE PULSELITE START WORKING ON THERE OWN. HE WENT IN THE AC AND SAW THAT THE PULSELITE SWITCH WAS NOT TO THE ON POSITION. HE CLOSED THE POWER TO THE AC. HE WENT TO THE PULSELITE CONTROL UNIT AND NOTICED A BURNED ODOR. HE WENT TO TOUCH THE PULSELITE CONTROL BOX BUT IT WAS VERY HOT AND COULD NOT TOUCH IT. NOTE: THE TECHNICIAN HAD REMOVED THE GROUND WIRE AND THE PULSELITE CONTROL BOX TO GAIN ACCESS TO ANOTHER BOX ON A SYSTEM THAT HE WAS WORKING ON.