Service difficulty report · Housing · Hiller UH12E

Difficulty date
April 18, 2019
Submitted
June 7, 2019
Operation
General aviation
Aircraft
N9749C
Make and model
Hiller UH12E
Aircraft serial
2146
Aircraft time
20,452 hours
Engine
Allsn 250C20B
Engine time
12,169 hours, 10,802 cycles
Part
Housing
Part number
2354211
Condition
Cracked
Location
Transmission
Component
Transmission · Hiller
Component part number
2370023
Stage of operation
IN
How discovered
V
Nature of condition
O
Precautionary procedure
K

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

What was found

A CRACK WAS FOUND IN TRANSMISSION LOWER HOUSING JUST BELOW THE CYCLIC BELLCRANK BRACKET P/N 33031 MOUNTING FACE. THE CRACK WAS LOCATED IN THE AFT LOWER MOUNTING BOSS FOR THE CYCLIC BRACKET IN THE FILLET OF THE LOWER HOUSING. SEE ATTACHED PICTURES. CORRECTIVE ACTION WAS TO REPLACE THE LOWER HOUSING.

More about the Hiller UH-12E