What was found
WHILE PERFORMING AN EDDY CURRENT INSPECTION OF THE .3750 DIAMETER BOLT HOLES ON THE LOWER SPAR CAP, 3 SMALL CRACKS WERE INDICATED. AD HAS BEEN ISSUED ADDRESSING THE ABOVE PROBLEM, HOWEVER IT DOES NOT ADDRESS AIRCRAFT OF THIS MODEL BELOW 4000 TT. I AM CONCERNED THAT THE TIME INTERVAL BEFORE PERFORMING THE INITIAL INSPECTION MAY BE TOO HIGH. WOULD SUGGEST LOWERING THIS TIME. I ALSO FEEL THAT A REPETITIVE INSPECTION INTERVAL NEEDS TO BE ESTABLISHED, EVEN AFTER COMPLIANCE OF THE AD. A ROUTINE INSPECTION OF THE SPAR CAP WILL ALLOW AN OPERATOR TO KNOW IF THE WINGS INTEGRITY HAS BEEN COMPROMISED AND IS IN EFFECT RIDING ON THE FAIL SAFE PLATE.