PGM-63 on 9 May 1963 trials - J. M. Martinac Shipbuilding Corp
Class overview
Builders	Marinette Marine Corp., Marinette, WI J.M. Martinac Shipbuilding Corp., Tacoma, WA Peterson Builders, Sturgeon Bay, WI Tacoma Boat Building Co., Tacoma, WA
Preceded by	PGM-9 class
Succeeded by	Asheville class
Built	1959-1970
Completed	59
General characteristics
Type	Motor gunboat
Displacement	118 tons
Length	101 ft (31 m)
Beam	21 ft (6.4 m)
Draft	6.8–9 ft (2.1–2.7 m)
Propulsion	2 × Mercedes Benz 12V493 TY57 2,200 hp (1,600 kW) diesel engines 2 × shafts
Speed	17 knots (31 km/h; 20 mph)
Complement	17
Armament	1 × 40 mm gun 2 × 20 mm guns 2 × 12.7 mm machine guns 81 mm mortar (some units)

The PGM-39-class gunboats, designated Patrol Gunboat, Motor^[a] by the United States Navy were a class of fifty nine gunboats constructed in various shipyards from 1959–1970. The design was based on the United States Coast Guard Cape-class cutter design with a five-foot (1.5 m) hull extension. It was specifically designed for the U.S. Military Assistance Program and was used by the navies of The Philippines, Indonesia, South Vietnam, Thailand, Burma, Ethiopia, and Ecuador.

The members of this class of gunboats are:
PGM-39 to PGM-46
PGM-51 to PGM-83
PGM-91
PGM-102 to PGM-108
PGM-111 to PGM-117
PGM-122 to PGM-124

The first vessel (PGM-39) of the class was used by the Philippine Navy as BRP Agusan (PG 61). The other Philippine Navy units were PGM-40 as BRP Catanduanes (PG 62), PGM-41 as BRP Romblon (PG 63), PGM-42 as BRP Palawan (PG 64), and PGM-83 as BRP Basilan (PG 60) ex-RVN Hon Troc (HQ 618).

The PGM-39 class has varied weapons mix of 40 mm and 20 mm cannon, 12.7 mm machine guns, and 81mm mortar.

Status of remaining ships

BRP Palawan (PG 64) and BAP Río Chira (PC 12) are still in operation with the Philippine Coast Guard and Peruvian Coast Guard, respectively. Other PGMs are still in service in various capacities. However, the galvanic reaction between the steel hull and aluminum superstructure of the boats in seawater creates maintenance problems which significantly shorten their careers as military vessels.

Successor

The Asheville-class gunboat resulted from modification studies of the PGM-39 class.