Service difficulty report · Wire · Bombdr DHC8400

Difficulty date
November 26, 2013
Submitted
September 14, 2015
Operation
General aviation
Make and model
Bombdr DHC8400
Aircraft time
2,367 hours
Engine
Pwc PW150A
Part
Wire
Condition
Shorted
Location
Connector
Part time
2,051 hours
Stage of operation
LD
How discovered
O
Nature of condition
J
Precautionary procedure
H

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

What was found

(CAN) NR 2 AC GEN CAUTION ON LANDING. INITIAL RUN SHOWED NO LOAD ON NR 1 AC GEN BUSS, ALL THE LOAD WAS BEING HANDLED BY THE NR 2 GEN (INDICTATED AS 116 VOLTS ON ALL THREE PHASES ON NR 1 WITH LOAD OF 0.01, ON NR 2 VOLTAGE WAS 114 VOLTS WITH A LOAD OF 0.19 ON ALL PHASES) WHEN POWER LEVER WAS BROUGHT FROM FLIGHT IDLE TO DISC OR DISC TO FLIGHT IDLE, NR 2 AC GEN CAUTION LIGHT ILLUMINATED AND NR 2 LOAD FELL TO ZERO ON ALL PHASES AND NR 1 LOAD CLIMBED TO 0.21 WITH VOLTAGE REMAINING AT 116 VOLTS. SWAPPED GCUÏ¿½S ,NO CHANGE. SWAPPED BACK REPLACED #2 AC GENERATOR AND RAN A/C AGAIN, GOT BETTER SHARING OF OUTPUT LOADS ON EACH INDIVIDUAL BUS BUT THE SAME RESULT WITH THE POWER LEVER ADVANCEMENT OR RETARDING WITH THE NR 2 AC GEN CAUTION LIGHT, STILL ILLUMINATING AND LOAD INDICATION ON ELECTRICAL PAGE. UPON FUTHER TROUBLESHOOTING FOUND PIN C OF CONNECTOR 9811-718 SHORTING TO GND. SHIELD TERMINATION SOLDER SLEEVE REMOVED FROM WIRE AND FOUND WIRE EXPOSED AND SHORTING THROUGH THE SOLDER SELEEVE TO GROUND. WIRE W20002B-12-1 IS TO BE RETERMINATED AT CONNECTOR 9811-P718.