After P-50H class in service, the coast guard need large patrol boat with the real helicopter deck. they buy 2 corvettes from ST Marine Singapore and install old weapons and sensor by Ayutthaya Navy. CG-5 Lina entered service in 1992 and fitted as a flagship of Ayutthaya Coast Guard.
Ayutthaya Lina Class : Corvette Helicopter Deck
General specifications:
length: 72.1 m
beam: 9.5 m
draft: 2.4 m
displacement (max): 950 t
max speed: 24 kts
range: 3,000 nm @ 14 kts
complement: 79
Propulsion: 2× MTU 20V1163 TB83 diesel engines
2xshafts with controllable pitch propellers
Sensors:
1xAN/SPS-10 surface search radar radar (old)
1× Decca 1226 navigation radars radar (old)
Communication systems:
UHF antennas
Link11
Armament:
2xBofors 40/70 gun (old)
2xM2HB machine guns (old)
1x6 tons Helicopter Deck
In 2006 Lina Class refit because AN/SPS-10 and Decca 1226 out of order, by install 1xAN/SPS-67(V)3 serface search and navigation radar, 1xAN/SPS-73(V)12 navigation radar, 1xSatcom, 2xOerlikon 20 mm GAM-BO1 machine gun and 2x1.5 tons cranes.