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“Deterrence through Detection” UNCLASSIFIED

33. A major constraint on the SLAF and SLN joint maritime effort is the mission

incompatibility of available helicopters (Bell 212, Bell 412, Mi-17). Not only are these
limited by respective radius of action (ROA), endurance, stability in adverse weather,
night vision functions, but also tests and trails have confirmed incompatibility of landing
7
onboard SLN OPVs due to concerns over ‘D and T values ’.

34. However, the partnership between SLN and SLAF exemplifies an appreciation in

a joint approach at addressing contemporary maritime security challenges. Through the
introduction of advanced aerial surveillance platforms, specialized training, and joint
operational frameworks, the two forces have bolstered Sri Lanka’s ability to monitor
and protect its maritime domain. While challenges such as resource limitations persist,
the collaborative efforts between SLN and SLAF continue to strengthen Sri Lanka’s
maritime security infrastructure, ensuring a resilient and adaptive defence posture in
the region.

7
‘D & T’ (Diameter and Tonnage) values provide an approximation into integration of helos onboard. For
integration of helos onbaord surface vessels: D & T value of helicopter < D & T value of landing deck.

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UNCLASSIFIED “Deterrence through Detection”