Exhibit 31.1

Rule 13a-14(d) Certification

I, In-Young Chase, certify that:

1. I have reviewed this annual report on Form 10-K, and all reports on Form 8-K containing distribution or servicing reports filed in respect of periods included in the year covered by this annual report, of MS Structured Asset Corp. on behalf of SATURNS Trust No. 2005-3;

2. Based on my knowledge, the information in these reports, taken as a whole, does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading as of the last day of the period covered by this annual report;

3. Based on my knowledge the distribution or servicing information required to be provided to the depositor by the trustee under the pooling and servicing, or similar, agreement, for inclusion in these reports is included in these reports;

4. I am responsible for reviewing the activities performed by the depositor and the trustee under the pooling and servicing, or similar, agreement and based upon my knowledge and the annual compliance review required under that agreement, and except as disclosed in the Compliance Statement, the depositor and trustee have each fulfilled their obligations under that agreement; and

5. The reports disclose all significant deficiencies relating to the compliance by the trustee and the depositor with the minimum servicing or similar standards based upon the report provided by an independent public accountant, after conducting a review in compliance with the Uniform Single Attestation Program for Mortgage Bankers or similar procedure, as set forth in the pooling and servicing, or similar, agreement, that is included in these reports.

In giving the certifications above, I have reasonably relied on information provided to me by the following unaffiliated party: U.S. Bank as successor-in-interest to Bank of America, National Association and its officers and agents.

By: /s/ In-Young Chase

Name: In-Young Chase

Title: Vice President

Date: March 26, 2013

MS STRUCTURED SATURNS SERIES 2005-3 10-K