SSBN 627 James Madison

James Madison

SSBN 627 James Madison (1964)

Type	SSBN
Country	USA
Displacement (t)	8,250
Length (m)	130.0
Beam (m)	10.0
Draft (m)	8.7
Height (m)	10.0
Max speed submerged (kn)	21.0
Max speed surfaced (kn)	16.0
Max safe depth (m)	305
Endurance (days)	60
Propeller	1 x 7 bladed propeller
Nuclear reactors	1
Titanium hull	No
Navigation system	SINS Mk 2 (Inertial Navigation System)
Class year	1964

Sensors

Sonar (8)

Name	Type	Platform	Passive range (km)	Active range (km)
BQA-8	cav	sub	—	—
BQR-2B	Hull	sub	1.3	—
BQR-7	Hull	sub	2.6	—
BQS-4	Hull	sub	—	1.7
BSH-2	ssp	sub	—	—
DUUG-1	Active Intercept		—	—
UQG-1	com	sub	—	—
UQN-1B	Echo sounder	sub	—	—

Radar (1)

Name	NATO name	Air search	Surface search	Fire control
BPS-11A		—	Yes	—

Launchers (3)

Name	Tubes	Fire control	Max launch depth (m)
533mm Torpedo Tube (forward) 4 Mk 113 Mod 5 305 1956 - 1959: 4 x Mk 16 Mod 1 , 8 x Mk 37 Mod 0 1960 - 1966: 4 x Mk 16 Mod 1 , 0 x Mk 37 Mod 0 , 8 x Mk 37 Mod 1 1967 - 1970: 4 x Mk 16 Mod 7 , 8 x Mk 37 Mod 2 , 0 x Mk 37 Mod 3 1971 - 1973: 12 x Mk 48 Mod 1 1974 - 1976: 12 x Mk 48 Mod 2 1977 - 1982: 12 x Mk 48 Mod 3 1983 - 1987: 12 x Mk 48 Mod 4 1988 - present: 12 x Mk 48 Mod 5 ADCAP
Missile Launcher 16 — 125 1959 - 1961: 16 x Polaris A-1 1962 - 1963: 16 x Polaris A-2 1964 - present: 16 x Polaris A-3
Signal Ejector	2	—	305

Extendable devices (9)

Name	NATO name	Capabilities	Max depth (m)	Max speed (kn)
AT-317B Radio Antenna	—	Radio (VLF), Radio navigation	—	7.5
BPS-12 Radar	—	Radar	—	7.5
BRA-15 Radio Antenna	—	Radio (LF, MF, HF), Radio navigation	—	7.5
BRA-16 Radio Antenna	—	Radio (VLF), Radio navigation	—	7.5
BRA-9 Radio Antenna	—	Radio (LF, MF, HF), Radio navigation	—	7.5
BRD-6 RDF	—	Direction finder	—	7.5
Snorkel	—	Snorkel	—	7.5
Type 2D attack periscope	—	Periscope (attack)	—	7.5
Type 8 search periscope	—	Periscope (observation)	—	7.5

Towed devices (2)

Name	Type	NATO name	Towed decoy	Capabilities	Cable (m)	Depth (m)	Speed (kn)
BRA-8 (Imp.)	Trailing buoy	—	—	Receive, Radio (VLF, LF, Radio navigation)	450	396 – 61	3.0 – 12.0
Floating wire VLF (SUBTASK III)	Trailing wire	—	—	Receive, Radio (VLF, LF, MF, HF, Radio navigation)	549	91 – 37	2.3 – 9.0