# STC ST04831NY

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: Kilroy Aviation LLC, United States
- Description: Installation of Vortex Control Technologies Finlets
- Applied: March 8, 2022
- Status date: February 19, 2026
- Product: Aircraft, Large Airplane
- Certification basis: Part 25
- Data sheets: [TCDS A16WE](https://openairdocs.org/tcds/A16WE)
- Certificate PDF: https://openairdocs.org/files/sha256/7f/02/7f0239bfc638e29150a9a2e0b5c7ec5b8140a7434da1bf43542dcb210d896672
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID192256647220260306154854.0001
- DRS record last changed: March 6, 2026
- Page: https://openairdocs.org/stc/ST04831NY

## ADs that name it (0)

None.

## Approved models (3)

- The Boeing Company 737-700 Series ([TCDS A16WE](https://openairdocs.org/tcds/A16WE))
- The Boeing Company 737-800 Series ([TCDS A16WE](https://openairdocs.org/tcds/A16WE))
- The Boeing Company 737-900ER Series ([TCDS A16WE](https://openairdocs.org/tcds/A16WE))

## 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  This certificate issued to:

BB__ BB_.

Original Product 7\SH&HUWLILFDWH1XPEHU Make:

VHHFRQWLQXDWLRQVKHHW IRUDGGLWLRQDOGDWHV By Direction of the Administrator Signature:

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ilroy Aviation, LLC 16192 Coastal Highway Lewes, DE 19958 25 Title 14 Code of Federal Regulations A16WE The Boeing Company 737-700, -800, -900ER Series

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 a product,the holder must give this person written evidence of that permission. (See continuation sheet 3) 03/08/2022 05/03/2024 05/23/2023 02/19/2026 ✔ James N. Olmsted Lead ODA Administrator ODA-834775-NE 5

1. Installation of Vortex Control Technologies' Finlets in Boeing 737 aircraft model-series per Kilroy Aviation, LLC, Master Data Index Listing (MDIL) Document # J523-0020-001, Revision J, dated September 05, 2025, or later FAA approved revision.

(See continuation sheet 3) Digitally signed by James N Olmsted Date: 2026.02.19 15:55:02 -05'00'

Number  (IIHFWLYH'DWH I Transferr Endorsementt Transfer the ownership of Supplemental Type Certificate Number:

Too (Name and address of transferee):

Date oI transfer:

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

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate  (Continuation Sheet) Number  (IIHFWLYH'DWH  $Q\DOWHUDWLRQRIWKLVFHUWLILFDWHLVSXQLVKDEOH E\D ILQH RIQRW H[FHHGLQJRULPSULVRQPHQWQRWH[FHHGLQJ \HDUVRUERWK7KLVFHUWLILFDWH PD\ EHWUDQVIHUUHGRUPDGH DYDLODEOHWR WKLUGSHUVRQVE\OLFHQVLQJDJ UHHPHQWVLQDFFRUGDQFHZLWK&)53RVVHVVLRQ RIWKLV6XSSOHPHQWDO7\SH &HUWLILFDWH 67& GRFXPHQWE\SHUVRQVRWKHUWKDQ WKH 67&KROGHUGR HVQRWFRQVWLWXWHULJKWVWRWKHGHVLJQGDWD QRUWRDOWHUDQ DLUFU DIW DLUFUDIWHQJLQH KROGHU$Q 67&KROGHUZKRDOORZVDSHUVRQWRXVHWKH67&WRDOWHUDQDLUFUDIWDLUFUDIWHQJLQHRUSURSHOOHUPXVWSURYLGH WKDWSHUVRQZLWKZULWWHQ SHUPLVVLRQ DFFHSWDEOHWR WKH)$$ 5HI &)5  )$$  3DJH BBBRI BBB ST04831NY 02/19/2026 Additional date(s) amended: 10/12/2023, 2/26/2024, 7/11/2025, 9/25/2025.

Description of Type Design Change: (continued)

2. Maintenance to be performed in accordance with Instructions for Continued Airworthiness (ICA), Kilroy Aviation document #, either:

a. J522-ICA, revision D dated October 30, 2023, or later FAA-accepted revision, or

b. J625-ICA, revision B, dated December 15, 2025 or later FAA-accepted revision.

3. Aircraft is to be operated in accordance with Airplane Flight Manual Supplement (AFMS), Kilroy Aviation document #, either:

a. J523-AFMS, revision C, FAA-approved February 14, 2024, or

b. J625-AFMS, revision B, FAA-approved on February 18, 2026.

Limitations and Conditions: (continued)

3. A copy of this certificate and documents cited in this certificate must be maintained as part of the permanent records of the modified aircraft.

4. Mandatory replacement time and/or intervals are defined in the FAA-approved "Airworthiness Limitation Section" (ALS) within the Kilroy Aviation ICA document #:

a. J522-ICA, revision D, ALS FAA-approved October 12, 2023, or

b. J625-ICA, revision B, ALS FAA-approved February 18, 2026.

5. Comply with the Certificate Limitations Section of the Kilroy Aviation AFMS document #:

a. J523-AFMS, revision C, FAA-approved February 14, 2024, or

b. J625-AFMS, revision B, FAA-approved on February 18, 2026.

6. This modification has been reviewed and it has been determined that it does not require a revision to the EWIS ICA and is deemed acceptable for installation by the FAA. Reference 14 CFR §26.11, Amendment 26-7.

7. This STC is applicable to all serial numbers for The Boeing Company Models:

737-700, -800 and -900ER.

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate  (Continuation Sheet) Number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imitations and Conditions: (continued)

8. Configurations using these documents are not eligible for Foreign Validation. These documents will not be issued for future installations:

a. J522-ICA, Instructions for Continued Airworthiness,

b. J523-AFMS, Airplane Flight Manual Supplement.

Certification Basis:

1. Based on 14 CFR §§21.115 and 14 CFR 21.101 and the FAA Order 8110.48A, the Certification Basis for The Boeing Company Model-Series 737-700, -800, and -900ER aircraft is as follows:

a. The type certification basis for Boeing 737-700, -800, and -900ER as 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 March 8, 2022, is based upon Part 25 as amended by Amendment 25-108 and is as follows:

Regulations at amendment 25-0 through 25-108:

25.21(a,c,d) [Amdt 25-72], 25.23 [Amdt. 25-0], 25.29(b) [Amdt. 25-72], 25.171[Amdt 25-7],

25.173 (a,b,c,d) [Amdt 25-7], 25.175 (a,b,c,d) [Amdt 25-108], 25.177(c) [Amdt 25-108],

25.181(b) [Amdt 25-108], 25.251 (a)(b)(c)(d) [Amdt. 25-77], 25.301(a)(b) [Amdt. 25-23],

25.303 [Amdt. 25-23], 25.305 (a)(b)(c)(e)(f) [Amdt. 25-86], 25.307 [Amdt. 25-72], 25.365

(e)[Amdt. 25-0], 25.571(a)(b)(c)(d) [Amdt. 25-86], 25.571(e)(1)[Amdt. 25-96], 25.581

(a)(b) [Amdt. 25-23], 25.601 [Amdt. 25-0], 25.603 [Amdt. 25-46], 25.605 [Amdt.

25-46], 25.607 [Amdt. 25-23], 25.609(a)(b) [Amdt. 25-0], 25.611 [Amdt. 25-0], 25.613 [Amdt. 25-72], 25.629(b) [Amdt. 25-77], 25.841(a) [Amdt. 25-87], 25.901(c) [Amdt.

25-40], 25.903 (c) [Amdt. 25-100], 25.1301(a)(b)(c)(d) [Amdt. 25-0], 25.1309(b)(d) [Amdt. 25-41], 25.1419(a) [Amdt. 25-72], 25.1501 [Amdt. 25-42], 25.1529 [Amdt.

25-54], 25.1581(a)(d) [Amdt. 25-72], 25.1585(a123)(b) [Amdt 25-105], 25.1587(b3i)(b3ii) [Amdt 25-108].

(continued on next page) 45 02/19/2026 ST04831NY

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

c. Applicable 14 CFR Part 26 regulations at the latest amendment 26-0 through 26-7:

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 latest amendment date of this STC, compliance has been found for the following regulations:

14 CFR § 26.11(c) [Amdt. 26-7]; § 26.47(c) [Amdt. 26-7].

d. This modification has been substantiated to support No Acoustical Change verification per 14 CFR §21.93(b).

e. Equivalent Level of Safety:

ELOS Memorandum SA09849NY-T-F-1; 14 CFR 25.251(b) [Amdt. 25-77];

Equivalent Level of Safety (ELOS) for Vibration/Buffeting Compliance Criteria, Aft Lower Fuselage Finlet Installation on Boeing 737-800.

ELOS Memorandum ST09730NY-T-F-1; 14 CFR 25.251(b) [Amdt. 25-77];

Equivalent Level of Safety (ELOS) for Vibration/Buffeting Compliance Criteria, Aft Lower Fuselage Finlet Installation on Boeing 737-900/900ER.

ELOS Memorandum SA10076NY-T-F-1-25.251(b); 14 CFR 25.251(b) [Amdt. 25-77];

Equivalent Level of Safety (ELOS) for Vibration/Buffeting Compliance Criteria, Aft Lower Fuselage Finlet and Vortex Generator Installation on Boeing 737-800.

ELOS Memorandum ODA-KA-S1215-25.251(b); 14 CFR 25.251(b) [Amdt. 25-77];

Equivalent Level of Safety (ELOS) Finding for Vibration/Buffeting Compliance Criteria, Finlet Installation on Boeing 737-800, ODA Project # ODA-KA-S1215 END 55 02/19/2026 ST04831NY

## Every issue (7)

- February 19, 2026: Amended, Current. [certificate](https://openairdocs.org/files/sha256/7f/02/7f0239bfc638e29150a9a2e0b5c7ec5b8140a7434da1bf43542dcb210d896672)
- September 25, 2025: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/62/0c/620c027d3d7c0fd664e8e35d2d5c5e6222fc426b3d42ab2e058988f1b6671052)
- July 11, 2025: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/ec/c5/ecc5ae6ac20ff222c46fc6a91493242b649f84203aa3a4774e6aa8bd79a6e558)
- May 3, 2024: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/a6/ea/a6eaf9bdbac53c3f8c50dcc9b7bfe183ef8ffa3d80d411b69a5cc8996de7230f)
- February 26, 2024: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/ea/4e/ea4e8e5a393b38f446474e6f39f58f5f53767556782d750469c2d715936a4c89)
- October 12, 2023: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/f4/13/f4136828b8ebfed1978ebf574a00f73b6ef2c33b6a46e83094b7785891c79d65)
- May 23, 2023: Issued, Historical. [certificate](https://openairdocs.org/files/sha256/37/74/377446b94d4d70d1c6d00383538745fa65a9a52da682309bf58fe8b044ec5218)

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