SSN 593 Permit

Permit

SSN 593 Permit (1965)

Type	SSN
Country	USA
Displacement (t)	4,310
Length (m)	84.9
Beam (m)	9.6
Draft (m)	7.7
Height (m)	9.6
Max speed submerged (kn)	28.0
Max speed surfaced (kn)	15.0
Max safe depth (m)	305
Endurance (days)	70
Propeller	1 x 7 bladed propeller
Nuclear reactors	1
Titanium hull	No
Navigation system	SINS Mk 2 (Inertial Navigation System)
Class year	1965

Sensors

Sonar (9)

Name	Type	Platform	Passive range (km)	Active range (km)
BQA-8	cav	sub	—	—
BQQ-1 Active	Hull	sub	—	4.3
BQQ-1 Hull (BQR-7)	Flank	sub	2.6	—
BQQ-1 Sphere (BQS-6A)	Spherical	sub	2.6	—
BQS-14	Mine detection	sub	—	0.9
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-14		—	Yes	—

Launchers (2)

Name	Tubes	Fire control	Max launch depth (m)
533mm Torpedo Tube (forward) 4 Mk 113 Mod 2 305 1962 - 1962: 7 x Mk 16 Mod 0 , 16 x Mk 37 Mod 1 1963 - 1964: 7 x Mk 16 Mod 0 , 14 x Mk 37 Mod 1 , 2 x Mk 45 ASTOR 1965 - 1966: 5 x Mk 16 Mod 0 , 12 x Mk 37 Mod 1 , 2 x Mk 45 ASTOR , 4 x UUM-44A SUBROC 1967 - 1973: 5 x Mk 16 Mod 8 , 12 x Mk 37 Mod 2 , 2 x Mk 45 ASTOR , 4 x UUM-44A SUBROC 1974 - 1977: 14 x Mk 37 Mod 2 , 2 x Mk 45 ASTOR , 7 x Mk 48 Mod 1 , 4 x UUM-44A SUBROC 1978 - 1981: 7 x Mk 37 Mod 2 , 2 x Mk 45 ASTOR , 14 x Mk 48 Mod 2 , 4 x UUM-44A SUBROC 1982 - present: 2 x Mk 45 ASTOR , 17 x Mk 48 Mod 3 , 4 x UUM-44A SUBROC
Signal Ejector	2	—	305

Towed devices (1)

Name	Type	NATO name	Towed decoy	Capabilities	Cable (m)	Depth (m)	Speed (kn)
Floating wire VLF (SUBTASK I)	Trailing wire	—	—	Receive, Radio (VLF, LF, Radio navigation)	549	91 – 37	2.3 – 9.0

Notes

New 7-bladed propeller installed, which reduces speed but improves silencing.