STC ST11266DS

Number: ST11266DS

This certificate issued to: American Airlines, Inc., M&E Engineering Division, 3900 North Mingo Road, MD 537/TUL Tulsa, Oklahoma 74116

Part 25 of the Code of Federal Regulations.

Original Product Make: Boeing Type Certificate Number: T00021SE Model: 787-9

Description of Type Design Change: Activation of business class mini-suite doors in accordance with Master Data List, 104760-MDL, Revision A, dated June 20, 2025 or later FAA approved revision and Serial Number Effectivity Report 104760-SNER, Revision A, dated June 9, 2025 or later FAA 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.

For Aircraft Serial Numbers: 66007, 66008, 66009, 66010, 66011, 66012, 66013, 66018, 66019, 66020, 66021:

This STC is contingent on prior or concurrent incorporation of FAA approved Boeing Service Bulletin for Equipment and Furnishings - Passenger Compartment Seats - Replacement of Business Class Seat Door Lower Guide and Bumper, B787-81205-SB250344-00, Issue 001, Dated 23 May 2025.

(Limitations and Conditions continued on page 3 of 3)

Date of Application: April 10, 2024 Date Reissued:

Date of Issuance: June 23, 2025 Date Amended:

Signature Tim Brown

Title: ODA-700094-SW Administrator

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: ST11266DS

Transfer the ownership of Supplemental Type Certificate Number: ST11266DS

To (Name and address of transferee)

From (Name and address of grantor)

FAA Form 8110-2 (3/21) Page 2 of 3

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: ST11266DS

The Airplane Flight Manual Supplement, 104760-AFMS, Revision NEW, dated June 20, 2025 or later FAA approved revision shall be made available to the operator at the time of installation.

The Instructions for Continued Airworthiness, document number 104760-ICA, Revision D, dated June 17, 2025 or later FAA 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 Boeing Model 787-9 aircraft for the change is as follows:

a. The Type Certification basis for Boeing Model 787-9 airplanes is shown on TCDS T00021SE 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, April 10, 2024 is based upon Part 25, as amended by Amendment 25-151. 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 25-151:

25.301, 25.303, 25.305(a)(b), 25.561(b), 25.601, 25.603, 25.605, 25.785(b), 25.789, 25.791(e), 25.803(c), 25.815,

25.853(a), 25.1301(a), 25.1529, 25.1541, 25.1557(d), 25.1581(a)(2), 25.1729

Regulations at the amendment level in TCDS T00021SE:

25.307(a)

Exemptions from 14 CFR Part 25:

Grant of Exemption, Section 25.813(e) Amendment 25-128 – No door may be installed between any passenger seats that is occupiable for takeoff and landing and any passenger emergency exit, such that door crosses any egress path (including aisle, cross aisles and passageways); Exemption 20822, August 14, 2023.

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FAA Form 8110-2 (3/21) Page 3 of 3