What was found
ON FLIGHT 4111 CREW REPORTED ON APPROACH, AFTER LANDING GEAR DEPLOYMENT SHOWING DOWN AND LOCK, GPWS WARNING TOO LOW GEAR AC WAS IN POSITIVE CLEARANCE WITH GROUND. CREW ABORTED APPROACH AND DECLARED EMERGENCY. CREW HAD TOWER CONFIRM LANDING GEAR DEPLOYMENT. AC LANDED SAFELY AND TAXIED TO THE GATE WITHOUT FURTHER INCIDENT. AC REMOVED FROM SERVICE C/A MEL 34-20. REMOVED AND REPLACED RADIO ALTIMETER IAW AMM 34-31-01, OPS TEST GOOD. AC RETURNED TO SERVICE MEL RESTORED. (K)