# STC SA12370NY

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Bighorn Airways, Inc., United States
- Description: Installation of a Garmin G700 Avionics System
- Applied: December 12, 2024
- Status date: May 13, 2026
- Product: Aircraft, Small Airplane
- Certification basis: Part 23
- Data sheets: [TCDS A16EU](https://openairdocs.org/tcds/A16EU)
- Certificate PDF: https://openairdocs.org/files/sha256/8c/a9/8ca995ee778a46b673aefa056d1158734abdca623a9b2b0cc598677339922224
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID108928788620260624152451.0001
- DRS record last changed: June 24, 2026
- Page: https://openairdocs.org/stc/SA12370NY

## ADs that name it (0)

None.

## Approved models (1)

- General Atomics AeroTec Systems GmbH Dornier 228-202 ([TCDS A16EU](https://openairdocs.org/tcds/A16EU))

## 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:

Certifies that the change in the type design for the following product with the limitations and conditions of BB__ BB_.

Original Product 7\SH&HUWLILFDWH1XPEHU Make:

VHHFRQWLQXDWLRQVKHHW IRUDGGLWLRQDOGDWHV By Direction of the Administrator Signature:

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ighorn Airways, Inc.

912 West Brundage Lane Sheridan, WY 82801 therefore as specified hereon meets the airworthiness requirements of Part 23 Title 14 Code of Federal Regulations A16EU General Atomics AeroTec Systems GmbH Dornier 228-202

1. The installer must determine whether thisdesign 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 t his person written evidence of that permission.

(Limitations and Conditions continued on page 3 of 4) 12/12/2024 04/29/2026 Michael P. Linegang Manager, East Certification Branch Compliance and Airworthiness Division Aircraft Certification Service 4

1. Installation of a Garmin G700 Avionics System in a Dornier 228-202 per Kilroy Aviation, LLC, Master Data List, Installation (MDL-I), # J621-S1222-003, Revision E, March 4, 2026, or later FAA-approved revision.

(Description of Type Design change continued on page 3 of 4) 05/13/2026 Limitations and Conditions:

Number   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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umber SA12370NY (IIHFWLYH'DWH 05/13/2026 Description of Type Design Change: (continued)

2. Maintenance is to be performed in accordance with Instructions for Continued Airworthiness (ICA), Kilroy Aviation, LLC, # J621-S1222-019, Revision IR, dated January 14, 2026, or later FAA-accepted revision.

3. Aircraft is to be operated in accordance with Airplane Flight Manual Supplement (AFMS), Kilroy Aviation, LLC, # J621-S1222-018, Revision IR, FAA-approved March 18, 2026.

Limitations and Conditions: (continued)

3. This STC is applicable to all serial numbers for the General Atomics AeroTec Systems GmbH Dornier 228-202 aircraft.

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

5. The aircraft must be operated in accordance with the "Limitations" section of the AFMS, Kilroy Aviation, LLC, # J621-S1222-018, revision cited above.

6. There are no Airworthiness Limitations in the of ICA associated with this type design change.

Certification Basis:

Based on 14 CFR §§ 21.115, 21.101, 21.17(a) and the FAA policy for significant changes per FAA Order 8110.48, the certification basis for the General Atomics AeroTec Systems GmbH model Dornier 228-202 aircraft is as follows:

a. The type certification basis for parts not changed or not affected by this change for Dornier 228-202 is listed on TCDS A16EU.

b. The type certification basis for parts changed or affected by this change since the reference date of application, December 12, 2024 is based upon part 23 as amended by Amendment 23-65. 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:

(See continuation sheet 4) 34

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate  (Continuation Sheet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ertification Basis: (continued) Regulations at the amendment level in TCDS:

23.29(b)[23-21], 23.301[Initial], 23.303[Initial], 23.305 (a)(b)[Initial], 23.307(a) [Initial], 23.561 (a,b,d,e)[23-7], 23.601[Initial], 23.603 [23-23], 23.605(a)[23-23],

23.609 [Initial], 23.611 [23-7], 23.613 [23-23], 23.615 [23-7], 23.619 [23-7],

23.623(a) [23-7], 23.625(a) [23-7], 23.627 [Initial], 23.771(a) [23-14], 23.831 [Initial],

23.853(a) [23-23], 23.863 [23-23], 23.867(a,b,c) [23-7], 23.1327 [23-20], 23.1335 [23-20],

23.1351(a,b(1)(ii)(iii),b(3)) [23-20], 23.1353(b,c,f) [23-21], 23.1357 [23-20],

23.1365 [23-14], 23.1367 [Initial], 23.1381 [Initial], 23.1541 [23-21], 23.1547 [23-20] Regulations at an intermediate amendment:

23.773 [23-45C], 23.777(a,b,g) [23-62], 23.779(b)(2) [23-51], 23.781 [23-33],

23.1203(d) [23-51], 23.1301(a,b,c) [23-62], 23.1303 [23-62], 23.1305(a,c,e) [23-52],

23.1306(a,b) [23-61], 23.1307 [23-49], 23.1308(a,b,c) [23-57], 23.1309 [23-62],

23.1310 [23-62], 23.1311 [23-62], 23.1321 [23-49], 23.1322 [23-43], 23.1323(a,b) [23-62],

23.1329 [23-49], 23.1331 [23-62], 23.1337(b,c,d,e) [23-51], 23.1359 [23-49],

23.1431 [23-62], 23.1457(a,b,c) [23-58], 23.1459 [23-58], 23.1501 [23-21], 23.1523 [23-34],

23.1525 [23-45], 23.1527 [23-45], 23.1529 [23-26], 23.1543 [23-50], 23.1545 [23-50],

23.1555 [23-62], 23.1559 [23-62], 23.1563 [23-62], 23.1567(a,e) [23-62], 23.1581 [23-50],

23.1583 [23-50], 23.1585 [23-62], 23.1587 [23-62], 23.1589 [23-50] Regulations from 14CFR Part 25:

25.853(a) [25-83] -----------END------------- 44 Number SA12370NY (IIHFWLYH'DWH 05/13/2026

## Every issue (2)

- May 13, 2026: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/8c/a9/8ca995ee778a46b673aefa056d1158734abdca623a9b2b0cc598677339922224)
- April 29, 2026: Issued, Historical. [certificate](https://openairdocs.org/files/sha256/45/89/4589bdff30d9cb079aeadaaf57bb15bdd01ec3e46a90fdae0515c1efa5e04d6f)

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