TC reported Rear DT car 'B4' door not proven closed. TC recycled 4 times - ok. Fault did not recur n ext station. ~~~~~ * ,N *

'[Level 3] [NSEWL] T346(3615) Train Door Not Proven Closed at TPG EB:
Rear DT car "B4" train doors was not proven closed. TC cycled train doors few times to clear fault. Staff (TPG) feedback fault self cleared and fault did not recur at the next station. ID: 2.5 mins. (sent at 20:28 15-Nov-2023)

1. Fault confirmed/Fault cannot be duplicated
Fault was unable to be duplicated in depot. Doors were not isolated but with isolation stickers , and doors were able to operate in depot.

2. What was found from ER/Fault Trace
 FC 933/936 at car 3616 – Saloon door B1 not B4 as reported
 Close Operation Timeout CLE at time of fault/Open in motion

3. Troubleshooting details

Probable Causal Factors
These are 5 identified causal factors based on FTA:

A. Door Rollers
Likely
Found 3616 B1 LHS/RHS outer roller rubber delaminated from the roller itself. Refer to the video below.

B. External Obstruction
Unlikely
Checked and found no FOD nor signs of FOD scratch marks.

C. Door lock switch or door close switch faulty
Unlikely
DMI and DIR able to light and extinguish accordingly during door cyclic test. DLS red line checked satis when door is close, and securing nuts were tight. DLS cushion rubber intact. DCS distance from actuating plate satis. Door locking device went down fully after door close command.

D. Internal obstruction
Unlikely
No door rubbing marks observed. Weather strips in good condition. No abnormal noise heard during cyclic test
E. Door motor faulty
Unlikely
Motor was able to open/close doors with no abnormalities nor unusual sounds.

4. Rectification details
- Replaced main rollers on 3616 B1 LHS/RHS door.
- Door operation was smooth without wobbling, cyclic test ok with DIR/DMI able to extinguish
- Door static test timing within criteria.
- Door push/pull resistance force satis.
- Door mating strip distance satis.
- Serviced J-rail and guide rail preventively.
PREVENTIVE MEASURES
Checked 3616 B4 door operation -Satis

DONE BY: AZLI/ZAIDI/IDRIS 16.11.2023