What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: DURING APPROACH WHEN FLAPS 1 SELECTEDNO RESPONSE FROM FLAPS. AIRCRAFT EMERGENCY LANDED SAFELY AT CLT. PERFORMED FIM TASK 27-59-00-810-804 TE FLAP SUPPORT NO. 4 SKEW PROBLEM FOR MAINTENANCE MESSAGE 27-53252 FLAP 4 SKEW. MEASURED THE DISTANCE FROM THE BALLSCREW NUT TO THE YOKE ON TRANSMISSIONS NUMBER 4 AND NUMBER. 5. BOTH MEASUREMENTS MATCHED. NO DAMAGE NOTED ON BALLSCREW AND GIMBAL, TRANSMISSION, CARRIAGE AND ROLLERS OR FLAP TRACK. REPLACED INBOARD FLAP INBOARD SKEW SENSOR NUMBER 4. PER AMM 27-59-01. OPS CHKS GOOD.