STC ST04498AT

ST04498AT Aircraft Reconfig Technologies, LLC 8010 Piedmont Triad Parkway Greensboro, NC 27409 Part 25 Federal Aviation Regulations A28NM Airbus A321-271NX (Limitations and Conditions continued on page 3) 5/8/25 7/20/26 Jose Pevida - ODA Administrator Lead ODA-100214-CE 4 Interior Reconfiguration of an Airbus A321-271NX aircraft in accordance with Aircraft Reconfig Technologies, LLC Master Data List 24T032L001, Revision A, dated 20 Jul 2026, or later FAA approved revisions. (Description of Type Design Change continued on page 3).

ST04498AT 07/20/26 4

ST04498AT 07/20/26 (Description of Type Design Change continued) Aircraft Reconfig Technologies Instructions for Continued Airworthiness 24T032R009, Revision 00, dated 29 May 2026, or later FAA accepted revisions are a required part of this STC.

(Limitations and Conditions continued)

1) This approval should not be extended to other aircraft of this model on which other previously approved modifications are incorporated unless it is determined by the installer that the interrelationship between this change and any of those other previously approved modifications will produce no adverse effect upon the airworthiness of that airplane.

2) If the holder agrees to permit another person to use this certificate to alter the product, the holder shall give the other person written evidence of that permission.

Certification Basis Based on 14 §§ CFR 21.115 and 21.101, and the FAA policy for significant changes in FAA Order 8110.48, the certification basis for the Airbus A321-271NX aircraft is as follows:

a. The type certification basis for the Airbus A321-271NX aircraft is shown on TCDS A28NM for parts not changed or not affected by the change.

b. The certification basis for parts changed or affected by the change since the reference date of application, 08 May 2025 is based upon Part 25 as amended by Amendment 25-153. Based on 14 §§ CFR 21.115 and 21.101, and the FAA policy for significant changes in FAA Order 8110.48, the certification basis for this modification was determined to be:

Regulations at the latest amendment 25-0 through 25-153:

25.1, 25.301, 25.303, 25.305(a)(b), 25.562(a)(b)(c), 25.601, 25.603, 25.605(a), 25.609,

25.611(a), 25.613(a)(b), 25.619, 25.625, 25.789(a), 25.793, 25.803(a), 25.813(a)(d)(c)(e),

25.815, 25.853(a)(c)(d)(e)(g)(h), 25.854(a), 25.899, 25.981(d), 25.1360(a), 25.1411(a)(b),

25.1423(c), 25.1438(c), 25.1529, 25.1541(a)(1)(b), 25.1557(a), 25.1561(b)(c)(e),

25.1583(c)(1)(2), 25.1713(c).

(Certification Basis continued on next page) 3 4 Add Page

ST04498AT 07/20/26 (Certification Basis continued)

Regulations at an intermediate amendment: None.

Regulations at amendment level in TCDS A28NM:

25.29, 25.307(a)(d), 25.365(e)(2)(g), 25.561(a)(b)(3)(c), 25.571(b),

25.785(a)(b)(c)(d)(e)(h)(1)(i)(1)(3), 25.787(a)(b), 25.791, 25.811(b)(c)(d), 25.812(a)(1)(e),

25.831(a)(b)(c)(e), 25.851(a), 25.1301, 25.1309(a)(b)(g), 25.1351(a)(1), 25.1353(a),

25.1357(a)(c), 25.1431(a)(c), 25.1447.

14 CFR Part 26 Regulations

Based on 14 CFR 21.101(g), applicable provisions of 14 CFR part 26 are included in the certification basis. For any future 14 CFR part 26 amendment, the holder of this STC must demonstrate compliance with the applicable sections. As of the issuance date of this STC, compliance has been found for the regulations (Amdt 26-0 through 26-7):

26.11(c), 26.47(c) -------------------------------------------------------END------------------------------------------------ 4 4 Add Page