SDR 2022F00091

Service difficulty report · Spar Cap · Skrsky S76B

Difficulty date
December 23, 2021
Submitted
February 2, 2022
Operation
General aviation
Aircraft
N7644S
Make and model
Skrsky S76B
Aircraft serial
760314
Aircraft time
9,513 hours, 23,416 cycles
Engine
Pwa PT6B36
Engine time
8,653 hours, 12,070 cycles
Part
Spar Cap
Part number
7620105002128
Part serial
NA
Condition
Cracked
Location
Zone 300
Part time
9,513 hours, 23,416 cycles
Component
Tail Rotor Pylo · Skrsky · NA
Component part number
7607020534011
Stage of operation
IN
How discovered
V
Nature of condition
P
Precautionary procedure
K

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

What was found

DURING COMPLIANCE WITH SIKORSKY SERVICE BULLETIN 76-015, A CRACK WAS DISCOVERED RADIATING AROUND THE UPPER LEFT HORIZONTAL STABILIZER ATTACHMENT FITTING BOLT HOLE. THE CRACK WAS INITIALLY DISCOVERED VISUALLY AND CONFIRMED WITH DYE-PENETRANT INSPECTION. THE CRACK IS LIMITED TO THE AFT SPAR CAP ANGLE, SIKORSKY P/N: 76201-05002-128. THIS CRACK IS APPROXIMATELY 5.00 INCHES ABOVE THE AREA THAT IS AFFECTED BY SB 76-015. IN COMMUNICATION WITH SIKORSKY, IT HAS BEEN DETERMINED THAT THE AFT SPAR CAP ANGLE REQUIRES REPLACEMENT.