SDR 20010510AP008

Service difficulty report · Resistor · Dhav DHC6300

Difficulty date: April 27, 2001
Submitted: April 27, 2001
Operation: General aviation
Make and model: Dhav DHC6300
Aircraft serial: 680
Aircraft time: 7,375 hours, 5,529 cycles
System (JASC): 3040 · Windshield/Door Rain/Ice Removal
Part: Resistor
Part number: F307
Condition: Burned
Location: Windshield Wiper
Stage of operation: DE
How discovered: V
Nature of condition: B
Precautionary procedure: H

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

What was found

WINDSHIELD WIPER DROPPING RESISTOR SHORTED TO GROUND THROUGH DEACTIVATED WINDSHIELD WASHER RESISTOR MOUNT. THE WIPER DROPPING RESISTOR LEAD CHAFFED ON THE WINDSHIELD WASHER RESISTOR MOUNTING BRACKET. THIS RESULTED IN SMOKE IN THE COCKPIT DURING DESCENT WHILE USING WINDSHIELD WIPERS IN THE SLOW MODE. DEHAVILLAND MODIFICATION (MOD 6/1827)DEACTIVATED THE WINDSHIELD WASHER OPTION BY REMOVING THE WASHER SWITCH FROM THE OVERHEAD PANEL AND STOWING OR CAPPING THE POWER WIRE TO THE WASHER RESISTOR.