SHAH ALAM: It appears that both KD Tunku Abdul Rahman and KD Tun Abdul Razak , the two Perdana class submarines – were equipped with new equipment during their major refit a few years back.
From the post on KD TAR refit:
By all accounts – a refit or overhaul – extends a submarine’s life by repairing its hull and modernising its combat capability. It involves examining, repairing and even replacing parts of the hull; replacing worn-out cabling and piping ; and replacing or upgrading major weapons, sensors and communication systems.
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Work on Tunku Abdul Rahman started in 2016 and it was likely completed in 2019 while Tun Abdul Razak went into the yard in 2019 and it came out in 2021.
As RMN (as other navies) never announced whether it had fitted new equipment on both boats during the refit, we must rely on pictures published by RMN itself to spot the new things (though not on the first time). After seeing a number of photographs of both submarines I can surmised that they now have horizontal bumps on the rear of both sides of their conning towers.
I have no idea what it is. It is likely a sonar array of some sorts or even something more benign. The bumps had never been seen on both submarines prior to their refits. Anyone visiting the Eastern Fleet Command Open Day (today and tomorrow) at the Kota Kinabalu naval base can see the bumps on Tunku Abdul Rahman and other things displayed at the jetty (see picture below).
— Malaysian Defence