Compressor local fault. MR pressure: 8 bar. ~~~~~ 3543 - Compressor local fault. MR pressure: 8 bar. L3.
No sign of charging up. EB able to release now.
Standby for updates. (sent at 19:11 23-Oct-2023) .

L3 3544 air dryer replaced.
Security/function check - OK.
Air dryer able to purge at 2 min interval.
Checked on TIMS, no fault occur.

OPS 20 raised for further investigation.

 Aliff/Redzwan
24/10/2023

#3544 Air dryer S/N :
OLD : 01514-039
NEW : 0151 13880

To follow up.

L3 543/544 pneumatic test MR charged up slow with high leak rate when doors opened. Air leak 1.4 bar/5 min.
(Opened on #543 A/S & #544 B/S doors). 0.88 bar/5 min when all doors were closed.
ER showed #3543 cab occupied with LMRG activated for 4 mins when doors opened at station for 1.5 min. (#543 A/S, #544 B/S).
LMRG extinguished 2 min 50 sec after doors closed.
Both DT air dryer fault when train in depot.
3543 & 3544 Replaced both air dryer.
No loss of line voltage.
Found #2544 B1/B2/B4 doors manifold leaking. Replaced manifolds.
Further checked/found #2543 #1E B/S levelling valve, #3543 horn pipeline filter & #1543/#2544 MPV leaking.
Replaced the above-mentioned componenets.
Checked both DT CKAK/CK/AUXAR coils & contacts, CFR2 NC contacts & CCSW - OK.
LMRG checked - Satis.

Pneumatic Test Results :   #3543              #3544
Cut-in                 :   8.62 bar           8.59 bar
Cut-out                :   10.21 bar          10.38 bar
Charge-up time         :   2 min 28 sec       2 min 35 sec
Air Leak               :             0.48 bar/5 min

 Celine Tan
31/10/2023