What was found
FLIGHT 4145, RECEIVED GEAR DISAGREE ON GEAR EXTENSION. QRH COMPLETED FOR GEAR UP DISAGREE AND HYD 3 LOW PRESSURE CAUTION GEAR EXTENDED AND LOCKED WITH MANUAL EXTENSION. HYD 3 SHOWED LESS THAT 5 PERCENT FLUID AND ZERO PRESSURE. EMERGENCY DECLARED AND COMPLETED NORMAL LANDING. REPLACED LEFT HYDRAULIC PUMP NR 3A IAW AMM 29-12-03. REPLACED RIGHT HYDRAULIC PUMP NR 3B IAW AMM 29-12-03. OPS AND LEAK CHECKED GOOD. BLEED HYDRAULIC SYSTEM NR 3 IAW AMM 29-10-00. COMPLETED INSPECTION OF HYDRAULIC SYSTEM NR 3 IAW AMM 05-51-34. COMPLIED WITH PA 05-018G. GEAR DISAGREE CAUSED BY HYDRAULIC SYSTEM NR 3 FLUID LOSS. ALL CHECKED GOOD.