What timeframe did we utilize the T7 a main parachute, I am not talking about the reserve parachute but the main parachute
 

https://www.theriggerdepot.com/t-7-assemblies.html

 

Here is a link to The Rigger Depot page with T-7 information.  Below is a copy of part of the text on the page:

 

The T-7 parachute assembly was standardized on  March 13, 1944, but did not see service in-theater until late 1944. Although pack trays remained virtually identical to the T-5, the new single point release harness was introduced. The harness took a step away from the double layered Type VIII black dot webbing and instead used a thicker, single layer 5,000 lb Type X webbing.The earliest T-7s were manufactured with the OD painted hardware, but by early 1945, cadmium became standard.  At this time, a mixture of 4th and 5th model static line snap fasteners were used.The T-7 continued into the postwar era with numerous minor modifications. The T-7 soldiered on until its replacement by the T-10 in 1954.  

I looked at that and nothing specific on the T7A

The T-7A parachute system was adopted in 1948, and rendered obsolete by the T-10 in 1952. In all likelihood though, those dates are probably NOT the information you are actually seeking for a few reasons.

 

1) The "-A" designation gets applied to the system including the main, although the change was primarily in the reserve.  There were no substantial changes in the main assembly at that time. Many packs retained the "T-7" label on the main well past that date, and some even say "T-7 & T-7A."

 

2) Procurement and production of main assemblies 1946-1949 was virtually non-existent. So when you ask when the T-7A was "utilized", it may have been adopted on paper, but actual usage of the T-7A proper doesn't really start until 1950-1951. This was triggered primarily by the Korean War. Prior to Korea they were still using up huge stocks of late WWII production. Chutes had a service life of 8-1/2 years, meaning peacetime requirements were projected to be met with existed stocks all the way through 1953.

 

 3)  Major procurement of new T-7s during that time was also being pushed back, pending acceptance and standardization of first the XT-9, and then later the XT-10 (future T-10). The hope was to transition straight from largely WWII surplus straight to an entirely new model altogether.  Korea threw a wrench in the plan. To meet larger wartime requirements, it triggered a massive parachute buying spree of the existing T-7A style. When the T-10 was eventually standardized for use, actual procurement was delayed because about 50% of the chutes in service were brand new T-7s just purchased. That was roughly $12,000,000 of equipment, a significant dollar amount in the 1950s. To offset the cost of buying entirely new parachutes, T-7As were cobbled together with the new T-10 canopy and deployment bag. These "transitional" assemblies were used as late as 1961. Included is a picture of JKF with these T-7A modified to T-10s from 1961. 

In short, the T-7A Main was standard issue on paper from 1948-1953, manufactured basically 1950-1953, and actually used 1951-1961 in various configurations.

RWW already shared a link from my site, you might also check out reference article I wrote for more details. www.theriggerdepot.com/t-7--t-10-transition

 

 

 

Exactly what I was looking for. Thank you