Service difficulty report · Blade · Doug 600N

Difficulty date
May 27, 2001
Submitted
July 5, 2001
Operation
General aviation
Make and model
Doug 600N
Aircraft time
1,583 hours
Engine
Allsn 250C47M
Part
Blade
Part number
369D21102523
Condition
Cracked
Location
Main Rotor
Part time
642 hours, 16,555 cycles
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

(CAN) A/C STOPPED FOR REFUELING, DUE TO THE TQ EVENTS THAT HAD BEEN ACCUMULATED, (160) THE PILOTS CARRIED OUT A BLADE TORQUE EVENT INSPECTION I.A.W. SB600N-031. THEY FOUND THE WHITE BLADE TO BE CRACKED, BOTTOM SIDE, 12.5" O/B OF THE LAST BOLT ON THE BLADE GRIP, 2.25" I/B OF THE SERIAL # DATA PLATE, MID WAY IN THE BLADE, CRACK WAS MEASURED TO BE .75" LONG, BUT THE PILOTS CONFIRMED THAT THE CRACK WAS LONGER WITH THE BLADE SUPPORTED OFF THE DROOP STOP RING, AND WAS SAID TO RUN TO .25" FROM THE TRAILING EDGE, ESTIMATING THE CRACK TO BE 2.5" TO 3.0" LONG IN LENGTH.

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