Quick Links Menu.

Illustration for T-AO 166-167 in the Fiscal Year 1966 building program publicity pamphlet.

Illustration for T-AO 166-167 in the Fiscal Year 1966 building program publicity pamphlet.
Click on this photograph for links to larger images of this class.

Class: T2-SE-A1 JUMBO (T-AO 166)
Design: SCB Project Nos. 713.65, 713.66, and 713.67, conversion of MC T2-SE-A1
Note: These data are for unmodified T-AO 49 class tankers.
Displacement (tons): 5,630 light, 21,880 full
Dimensions (feet): 524' oa, 503' wl x 68' e x 30' max nav
Armament: none
Accommodations: 12 officers, 35 unlicensed
Speed (kts.): 15
Propulsion (HP): 8,250
Machinery: Steam turbo-electric, 2 boilers (450psi/730deg), 1 screw

Construction:
T-AONameReclasBuilderKeelLaunchSvc
166Not selected----------
167Not selected----------

Disposition:
T-AONameTInactStrikeDisposalFateMA Sale
166Not selectedT----25 May 1965Canc--
167Not selectedT----25 May 1965Canc--

Class Notes:
During 1961 the Navy developed a program to maintain the size of its force of fleet replenishment oilers by jumboizing eight of its newer T3's while also building new ships of the AO, AOR, and AOE types. The T3's would have their tank sections replaced and would be thoroughly rehabilitated for extended service life. In 1961 the Navy contracted with the Maryland Shipbuilding and Drydock Co. to assist in developing plans for the jumboized T3's based on their extensive experience with jumboizing commercial tankers. AO 105-109 were jumboized under FY 1963 and FY 1964, and AO 51, 98, and 99 followed in FY 1965 with a more elaborate conversion that was roughly equivalent to a new AOR.

The FY 1965 program also included the jumboization of two T2 tankers for MSTS. Approved characteristics for a T2 Tanker (T-AO) Jumbo, limited conversion, SCB Project No. 713.65, were promulgated on 27 February 1964 and updated as SCB Project No. 713.66 on 3 September 1964. The two ships were first authorized in September 1964 under FY 1965 (pamphlet dated 30 April 1964) but were cancelled on 25 May 1965. They were then requested in FY 1966 (pamphlet 15 June 1965) and FY 1967 (pamphlet 15 June 1966). The FY 1967 pamphlet stated that "This limited conversion (Project No. 713.67) is part of the continued modernization of the MSTS nucleus fleet. It consists of modifying an existing T2 Tanker by fitting in a new mid-ship section ... to increase petroleum cargo capacity by 60,000 barrels to a total of 209,000 barrels. The MSTS tanker is a point-to-point ship engaged in a pipeline type of operation." (The capacity of the T-AO 149 class, rated as T5's, was 186,500 barrels and that of the later T-AO 168 class was 225,000 barrels.) The MSTS T2s active when the proposal was first made in 1964 were all but one (AO 74) of the T-AO 49 class (Sun Shipbuilding T2-SE-A1) plus six survivors of the T-AO 111 class (Marinship T2-SE-A2). The photo in the pamphlet is of a T-AO 49 class ship.

No MSTS T2's were ultimately jumboized, and instead the FY 1968 program as of February 1966 included a larger new construction T-AO with plans to build eventually nine of the ships to replace the remaining World War II T2 tankers then being used by MSTS. However high Vietnam War expenditures caused funding in FY 1968 and 1969 for Navy shipbuilding to evaporate and the new tankers were dropped before the submission of the FY 1968 budget. Instead the Navy turned to a build-and-charter program that resulted in the nine SEALIFT (T-AO 168) class tankers (q.v.).

Ship Notes:
T-AONameMCNotes
166Ship not selected
167Ship not selected

Page Notes:
Compiled: 18 Sep 2021
© Stephen S. Roberts, 2021