STC ST11121SC

FAA Form 8110-2 (03/21) United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: ST11121SC This certificate issued to:

Original Product Type Certificate Number: A16WE Description of Type Design Change:

Delta G Design, Inc.

100 Research Pkwy., Suite 3287-B Waco, TX 76704 Part 25 the Federal Aviation Regulations Installation of a AMT-3800 Antenna or HGA-7001 Antenna (structural provisions only) in accordance with Delta G Design Master Data List DGD-E38001-MD-01, Rev. E, dated June 19, 2021, or later FAA approved revision. Maintained per Delta G Design and Instructions for Continued Airworthiness DGD- E38001-IC-01, Rev. E, dated July 27, 2021, or later FAA accepted revision.

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 a product, the holder must give the other person written evidence of that permission. This certificate is for structural provisions only. EMI and functional testing is required as part of a separate approval when associated component parts are installed.

Certification Basis: Continued on page 3,4, and 5.

The Boeing Company 737-300, -400, -500, -600, -700, -700C, -800, -900, April 12, 2011 December 10, 2012 January 13, 2021;

February 7, 2014; December 15, 2020;

July 28, 2021 Jim Grigg Manager, Fort Worth ACO Branch Compliance and Airworthiness Division Aircraft Certification Service Page 1 of 5 -900ER

FAA Form 8110-2 (03/21) Page 2 of 5 United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: ST11121SC

FAA Form 8110-2 (03/21) Page 3 of 5 United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: ST11121SC Certification Basis:

1. Based on 14 CFR § 21.115 and 21.101(b)(1) and FAA Order 8110.48, the certification basis for the listed series of the Boeing 737 models modified by the installation of a Honeywell AMT 3800 SATCOM Antenna is as follows:

a. The type certification basis for the listed series of Boeing 737 airplanes is shown on TCDS A16WE 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 12, 2011, is based upon part 25 as amended by Amendment 25-129.

Based on 14 CFR § 21.115 and 21.101(b)(1), and FAA Order 8110.48, the certification basis for this modification was determined to be:

Regulations at the latest amendment 25-0 through 25-129 14 CFR § 25.23, 25.251(a)(b), 25.301(a)(b), 25.303, 25.305(a)(b)(e), 25.307(a), 25.321(b)(c)(d),

25.333, 25.341(a), 25.351, 25.561(c), 25.581(b)(c), 25.601, 25.603, 25.605(a), 25.607, 25.609,

25.625(a), 25.1401(b), 25.1519, 25.1529 Regulations at an intermediate amendment 14 CFR § 25.901(c) Amendment 25-126 Regulations at the amendment level in TCDS A16WE 14 CFR § 25.365(a)(b)(d) Amendment 25-0 14 CFR § 25.611 Amendment 25-23 14 CFR § 25.841(a) Amendment 25-38 14 CFR § 25.613(a)(b), 25.1419(a) Amendment 25-72 14 CFR § 25.571(a)(b)(e) Amendment 25-86 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 amended STC must demonstrate compliance with the applicable sections. As of the issuance date of this amended STC, compliance has been found for the following regulations: 14 CFR § 26.11(c) and

26.47 (Amendment Nos. 26-0 through 26-1).

(Continued on Page 4)

FAA Form 8110-2 (03/21) Page 4 of 5 United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: ST11121SC Certification Basis (continued):

2. The installation of a HGA-7001 Antenna, amended by December 15, 2020 and adding an installation location of the AMT-3800 antenna on the Boeing 737-800, amended by July 28, 2021 have been shown to comply with the following list of the Federal Aviation Regulations:

Regulations that meet amendment level 25-0

25.23, 25.365(a)(b)(d)(e), 25.601, 25.609, 25.1519 Regulations that meet amendment level 25-23

25.301(a), 25.611 Regulations that meet amendment level 25-46

25.603, 25.605(a) Regulations that meet amendment level 25-54

25.1529 Regulations that meet amendment level 25-72

25.307(a), 25.613(a)(b) Regulations that meet amendment level 25-77

25.251(b) Regulations that meet amendment level 25-86

25.305(a)(b)(e), 25.321(c), 25.571(a)(1)(3)(b)(5)(i)(ii)

25.351, 25.561(a)(b)(c) Regulations that meet amendment level 25-91 (Continued on Page 5)

FAA Form 8110-2 (03/21) Page 5 of 5 United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: ST11121SC Certification Basis (continued):

Regulations that meet amendment level 25-132

25.1529 App. H Regulation 26.47(c), amendment 26-0 Equivalent Level Of Safety Memo SA02869AC-T-F-1 for § 25.251(b) Equivalent Level Of Safety Memo SA02941AC for § 25.251(b) ----------------------------------------------------END--------------------------------------------------