Train doors not proven closed at Front DT car A3 door. TC opened and closed once to clear fault. Sta ff(CLE) checked and confirmedthat Front DT car A3 door hada 5cm gap. Staff(CLE) assist to push closed the train door ERS-10 ~~~~~ Train doors not proven closed at Front D   1. Fault confirmed/Fault cannot be duplicated Fault was able to duplicate in depot 2. What was found from ER/Fault Trace? From ER: 19:10 DIR remained lit, TC cycled door 3 times to clear fault 19:16 Door isolated, no fault recurrence thereafter. 3. Troubleshooting details Probable causal factor There are 5 identified causal factors based on FTA: A. Door Roller Likely In depot, 3514 A3 door was jammed at ajar position when opening. Manual push/pull force test failed. Found 3514 A3 RHS door roller pitted, door function test satis after rollers were replaced. B. External Obstruction Unlikely No signs of FOD was found. No scratch mark observed at door guide rail. C. Internal Obstruction Unlikely No door rubbing marks observed. Weather strips are secured. Condition of weather strips are good. No abnormal noise from J-rail. D. Door manifold/actuator faulty Unlikely No air leakages from actuator and manifold in open/closed position. E. Door close sensing switch rigging Unlikely Conducted 10/20mm gauge test - passed. 4. Rectification details Replaced all rollers at 3514 A3 door. Preventively clean up J-rail and guide rail. Door cyclic test 20x û satis, door operation was smooth Perform 10/20mm gauge test û Passed. Door open/close timing û ok. Door manual force check û ok. Function check door operation û SATIS. DIRBS checked - sealed. N.A LAI MANG KONG/ZAIDI/07.07.2024