STC SA04750NY

United States of America Department of Transportation Federal Aviation Administration TAIN STRATO Supplemental Type Certificate Number: SA04750NY This certificate issued to: Skyway Group, Inc.

122 Howard Langford Drive Uvalde, Texas 78801 Title 14 Code of Federal Regulations Original Product Type Certificate Number: A1 WI Make: Textron Aviation Inc.

Description of Type Design Change: Model: 525, 525A, 525B Installation of the Electric Flushing Toilet and External Service Panel in accordance with (1) Master Data List (MDL) SWG150-000, Rev IR, dated May 8, 2025, or later FAA approved revision. (2) Instructions for Continued Airworthiness (ICA) SWG150-1000, Rev A, dated April 15, 2025, or later FAA accepted revision, shall be made available to the operator at the time of installation and be incorporated into the operator's maintenance program.

(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 the certificate to alter the product, the holder must give the other person written evidence of that permission.

Limitations and Conditions: Continued on Page 3 of 3).

Date of Application: 10/2/24 Date Reissued:

Date of Issuance: 5/9/25 Date Amended: 3/30/26 see continuation sheet for additional dates By Direction of the Administrator Signature:

Title: Or ODA administrator, ODA-834634-NE

United States of America z Department of Transportation Federal Aviation Administration TAIN STRATO Supplemental Type Certificate (Continuation Sheet) Number: SA04750NY Effective Date: 03/30/26 Limitations and Conditions: (continued from Page 1 of 3):

(3) This STC is applicable to all serial numbers for the Make: Textron Aviation Inc. Models:

525, 525A & 525B.

Certification Basis:

Based on 14 CFR § 21.115 and § 21.101, and the FAA policy for design changes that are identified as not significant in FAA Order 8110.48, the certification basis for Make: Textron Aviation Inc. Model: 525, 525A & 525B is as follows:

(1) The type certification basis for parts not changed or not affected by the change is shown on TCDS A1WI.

(2) The modification certification basis for parts changed or affected by the change since the reference application date, October 2, 2024, is based upon 14 CFR part 25, effective Feb 1, 1965, through amendment 23-54. The certification basis for this modification was determined to be:

23.301(a)(b) amdt 23-48, 23.303, 23.305 amdt 23-45, 23.307(a), 23.321 amdt 23-45,

23.341 amdt 23-48, 23.365(a) (b)(c)(d), 23.561 amdt 23-48, 23.571(c) amdt 23-48,

23.573(b) amdt 23-48, 23.574(a) amdt 23-48, 23.575 amdt 23-48, 23.601,

23.603 amdt 23-23, 23.605(a) amdt 23-23, 23.609(a), 23.611 amdt 23-48,

23.613 amdt 23-45, 23.619 amdt 23-7, 23.625 amdt 23-7, 23.1301(a) (b)(c)(d) amdt 23-20,

23.1309(a)(b) 23-34, 23.1351(a) (b)(1)(i)(2) amdt 23-49, 23.1357(a)(c) amdt 23-43,

23.1359(c) amdt 23-49, 23.1365(a)(b)(d)(e) amdt 23-49, 23.1367(a)(b)(d),

23.1431(a)(b) amdt 23-43, 23.1541(a)(b) amdt 23-21.

--- END --- The ST's supporting documentation (drawings, instructions, specifications, flight manual supplements, etc.) is the property of the STC holder.