STC ST04538AT

Title: (for) Christina M. Underwood Manager, Atlanta ACO Branch Compliance and Airworthiness Division Aircraft Certification Service ST04538AT Avionics Support Group, Inc.

13155 SW 132 Avenue Miami, FL 33186 Part 25 the Federal Aviation Regulations The Boeing Company MD-11F Installation of the Cobham Aviator 200S INMARSAT SATCOM Communication System and external HELGA Low Gain Antenna in accordance with the Master Drawing List, 221234-MDL Rev E, dated July 14, 2022 or later FAA approved revision.

(See Continuation Sheet 3 of 4) September 2, 2021 July 15, 2022 4 A22WE

ST04538AT 4

ST04538AT Limitations and Conditions - cont.:

1. The installer must determine whether this design change is compatible with previously approved modifications.

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.

3. This modification has been determined to be a no acoustic change in accordance with 14 CFR 21.93(b).

4. Instructions for Continued Airworthiness (ICA) document 221234-ICA Rev IR, dated November 16, 2021 or later FAA Approved revision and Airplane Flight Manual Supplement (AFMS) document 221234-FMS, Rev IR, dated July 12, 2022 or later FAA approved must be made available to the operator at the time of installation.

ST04538AT 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 Boeing MD-11F series aircraft is as follows:

a. The type certification basis for Boeing MD-11F airplane is shown on TCDS A22WE 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, September 2, 2021, is based upon part 25 as amended by Amendment 25-146. 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 25-146 § 25.29 § 25.251 § 25.301 § 25.303 § 25.305 § 25.307 § 25.571 § 25.581 § 25.601 § 25.603 § 25.605 § 25.609 § 25.611 § 25.613 § 25.771 § 25.773 § 25.777 § 25.869 § 25.1301 § 25.1307 § 25.1309 § 25.1322 § 25.1351 § 25.1353 § 25.1357 § 25.1360 § 25.1431 § 25.1459 § 25.1529 § 25.1541 § 25.1581 § 25.1713

Regulations at an intermediate amendment None

Regulations at the amendment level in TCDS A22WE § 25.561

14 CFR Part 26 Regulations Based on 14 CFR 21.101(g), applicable provision 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 date of this STC, compliance has been found for the following regulation:

14 CFR 26.11 and 14 CFR 26.47

--------------------------END--------------------------- 4 4