STC ST09956SC

FAA Form 8110-2 (4/20) SUPERSEDES PREVIOUS EDITION Page 1 of ___

Part of the .

Model: DC-9-81(MD-81), DC-9-82(MD-82), DC-9-83(MD-83), DC-9-87(MD-87), MD-88 Description of Type Design Change:

ST09956SC Aircraft Systems and Manufacturing, Inc. (ASM) 1717 Universal City Blvd.

Universal City, TX 78148 25 Code of Federal Regulations A6WE Boeing Installation of Universal Avionics Systems Corporation (UASC) UNS-1 Flight Management System (FMS) with an option for a UASC UL-601 UniLink data link system in accordance with ASM Master Data List 5578-0000-00 Rev IR dated August 22, 2020 or later ODA approved revision.

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The installer must determine whether this design change is compatible with previously approved modifications. If the holder agrees to permit another person to use this certificate to alter the product, the holder must give the other person written evidence of that permission.

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03/28/2001 09/20/2001 05/29/2003 Amendment 1 08/22/2020 Amendment 2 Robert H. Wilcox ODA administrator ODA-834704-SW 3

FAA Form 8110-2 (4/20) SUPERSEDES PREVIOUS EDITION Page 2 of ___

ST09956SC 3

FAA Form 8110-2 (4/20) Page ___ of ___

ST09956SC Description of Type Design Change (cont'd):

AFMS Document No. 5578-2160-00, Rev C, May 29, 2003 or later FAA approved revision, or 5578-2160-03, Rev IR dated August 22, 2020 or later FAA approved revision is a required part of this modification. Instructions for Continued Airworthiness Document No. 5578-2170-00, Rev B dated June 29, 2006 or later approved revision, or 5578-2170-01, Rev A dated January 10, 2012 or later FAA approved revision, or 5578-2170-03, Rev C dated July 17, 2020 or later FAA approved revision, is a required part of this modification.

Limitations and Conditions (cont'd):

The FAA has reviewed the applicant's assessment showing that this modification does not impact the existing electrical wiring interconnection system instructions for continued airworthiness (EWIS ICA) and found that no additional EWIS ICA tasks are required.

The type certification basis for the airplanes is shown on TCDS A6WE, Revision 30, dated March 25, 2014, for parts not changed or not affected by this change is 14 CFR Part 25 Amendments 25-1 through 25-40, including 14 CFR § 25.1309 (Amdt. No. 25-41), § 25.1351 (Amdt. No. 25-41), and § 26.11 (Amdt. No. 26-0), § 26.33 (Amdt. No 26-3), and § 26.43 and 26.45 (Amdt. No. 26-1).

The certification basis for parts changed or affected by this change is based upon Part 25 as amended through Amendment 25-145.

Regulations at the latest amendment 25-0 through 25-145 14 CFR § 25.29 (b); 25.301(a,b); 25.303; 25.305(a,b); 25.307 (a); 25.365(a,b); 25.561(a,b); 25.581; 25.601;

25.603 (a); 25.605 (a); 25.607; 25.609 (a); 25.611 (a)(b); 25.625 (a)(b)(c); 25.771 (a); 25.777 (a); 25.789;

25.899 (a)(b1); 25.1301 (a); 25.1307 (c); 25.1309 (a)(b)(c)(d)(e); 25.1310; 25.1316 (b); 25.1321 (e); 25.1322 (b)

(d)(e1)(f); 25.1351 (a); 25.1353 (a)(c); 25.1355 (a)(c); 25.1357 (a)(c)(e); 25.1431; 25.1529; 25.1541; 25.1581 (a)

(b)(c); 25.1583 (e); 25.1585 (a)

Regulations at the latest amendment 26-0 through 26-4 14 CFR § 26.11(c), 26.47 and 26.49.

Regulations at an intermediate amendment:

14 CFR § 25.571 (a)(b) Amdt 25-45; 25.613 (a,b,c) Amdt 25-72; 25.773 (a1) Amdt 25-121; 25.869 (a1,4) Amdt 25-72; 25.981 (a3) Amdt 25-102.

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