# STC ST11257DS - Type: Supplemental type certificate - Status: Current, Issued - Holder: American Airlines Inc, United States - Description: Modification of Airbus A321-253NX aircraft to re-pitch several rows of main cabin seats - Applied: March 5, 2020 - Status date: July 18, 2020 - Product: Aircraft, Large Airplane - Certification basis: Part 21, Part 25, Part 26 - Data sheets: [TCDS A28NM](https://openairdocs.org/tcds/A28NM) - Certificate PDF: https://openairdocs.org/files/sha256/ad/6a/ad6a9f1cb26d4087cc8144f7d1a712efaf9322baa2a9135a3eac21a336f1b732 - FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/B94E9020EDC818C5862585DF00464D25.0001 - DRS record last changed: December 5, 2025 - Page: https://openairdocs.org/stc/ST11257DS ## ADs that name it (0) None. ## Approved models (1) - Airbus SAS A321-253NX ([TCDS A28NM](https://openairdocs.org/tcds/A28NM)) ## What the certificate says Read from the PDF's text layer, without the form's printed wording; the layout is lost and the order can differ. The PDF is the record. Number: ST11257DS This certificate issued to: American Airlines, Inc. 3900 N. Mingo Road Engineering Dept., MD 208 Tulsa, OK 74116 Part 25 of the Federal Aviation Regulations. Original Product – Type Certificate Number: A28NM Make: Airbus Model: A321-253NX Modification of Airbus A321-253NX aircraft to re-pitch several rows of main cabin seats in accordance with Master Data List, 103418-MDL, Revision A, dated July 18, 2020 or later ODA-700094-SW approved revision. This approval should not be incorporated in any aircraft of this specific model until compatibility of this modification with previously approved modifications has been determined by the installer. 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. (Limitations and Conditions continued on page 3 of 3) Date of Application: March 05, 2020 Date Reissued: Date of Issuance: July 18, 2020 Date Amended: Signature Cheryl L. Hurst Title: ODA-700094-SW Administrator FAA Form 8110-2 (5/14) Page 1 of 3 Transfer the ownership of Supplemental Type Certificate Number: ST11257DS To (Name and address of transferee) From (Name and address of grantor) FAA Form 8110-2 (5/14) Page 2 of 3 United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: ST11257DS This STC is contingent on prior or concurrent installation of BE Aerospace Service Bulletin 25-1073382-01, American Airlines A321-200 NX and Oasis Retrofit Meridian Headrest Cover Change, BMFT Lockout, Recline Lockout, Recline Change, “Literature Only” Placard Addition, Rev New dated June 17, 2020, or later approved revision The Instructions for Continued Airworthiness, Document Number 103418-ICA, Revision A, dated May 27, 2020 or later FAA/ODA accepted revision shall be made available to the operator at the time of installation. The aircraft shall be maintained in accordance with the applicable Instructions for Continued Airworthiness. A revised EWIS ICA is not required for this STC. Certification Basis: Based on 14 CFR 21.115 and 21.101, and the FAA policy for non-significant changes in FAA Order 8110.48, the certification basis for the Airbus Model A321-253NX aircraft for the change is as follows: a. The Type Certification basis for Airbus Model-253NX Series airplanes 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, March 05, 2020 is based upon Part 25, as amended by Amendment 25-146 and Part 26 as amended by Amendment 26- 6. Based on 14 CFR 21.115 and 21.101, and the FAA policy for non-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 25-146 25.301, 25.303, 25.365(g), 25.562(a)(b)(c)(5)(6)(8), 25.601, 25.603, 25.605, 25.609, 25.611(a), 25.619, 25.789(a), 25.803(a), 25.812(e)(1), 25.813(c)(1)(i)(2)(i)(3)(i), 25.815, 25.817, 25.853(a)(d), 25.1411(f), 25.1423(c), 25.1447(a)(c)(1), 25.1529, 25.1541 Regulations at an intermediate amendment level 25.613 Amendment 72, 25.869(a)(4) Amendment 72, 25.981(a)(3)(d) Amendment 125 Regulations at the amendment level in TCDS A28NM 25.21(a)(1), 25.29, 25.305(a)(b), 25.307(a), 25.561, 25.625, 25.785(a)(b)(d)(e)(i)(1)(3), 25.787(a), 25.791, 25.811(b), 25.1301(a)(b)(c)(d), 25.1309(a)(b)(d)(g), 25.1353(a)(b), 25.1357(a)(c), 25.1431(a)(c) 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 amendments, the holder of this STC must demonstrate compliance with the applicable sections. As of the issuance of this STC, compliance has been found for the following regulations 14 CFR § 26.11(c)(d)(5) (Amendment 26-0). -------------------------------------------------------------- END ----------------------------------------------------------------- FAA Form 8110-2 (5/14) Page 3 of 3 ## Every issue (1) - July 18, 2020: Issued, Current. [certificate](https://openairdocs.org/files/sha256/ad/6a/ad6a9f1cb26d4087cc8144f7d1a712efaf9322baa2a9135a3eac21a336f1b732) --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.