Service difficulty report · Starter Gen · Lear 60LEAR

Difficulty date
July 22, 2015
Submitted
July 22, 2015
Operation
General aviation
Aircraft
N731RJ
Make and model
Lear 60LEAR
Aircraft serial
406
Aircraft time
2,517 hours, 1,301 cycles
Part
Starter Gen
Part number
400SG138Q2
Part serial
2911
Condition
Damaged
Location
Engine
Stage of operation
NR
How discovered
O
Nature of condition
J
Precautionary procedure
O

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

What was found

ON NORMAL ENGINE START THE STARTER/GENERATOR WAS INTERMITTENT AT DISENGAGING STARTER AND AUTOMATICALLY GOING INTO GENERATE MODE. UPON TROUBLESHOOTING ISSUE FOUND THE V-BAND CLAMP BOLT WAS BROKEN BUT THE V-BAND SAFETY WIRING WAS STILL INTACT. AFTER REMOVAL OF STARTER/GENERATOR FOUND CONNECTOR PLUG RECEPTICAL ON STARTER/GENERATOR BROKEN AND THE ANTI-ROTATION PINS SHEARED OFF. THIS CAUSED THE STARTER/GENERATOR TO SHIFT ON THE QAD ASSEMBLY CAUSING THE CONNECTOR PLUG TO BE DAMAGED AND ALSO DAMAGING THE QAD BEYOND MM LIMITS. IT IS UNKNOWN IF THE ANTI-ROTATION PINS SHEARED OR IF THE V-BAND CLAMP BOLT BROKE FIRST.