# STC SE04840NY

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Kilroy Aviation LLC, United States
- Description: Installation of HarcoSemco Exhaust Gas Temperature (EGT) Electrical Harnesses in CFM56-7 engine
- Applied: May 21, 2023
- Status date: February 6, 2024
- Product: Engine
- Certification basis: Part 33
- Data sheets: [TCDS E00055EN](https://openairdocs.org/tcds/E00055EN), [TCDS E00056EN](https://openairdocs.org/tcds/E00056EN)
- Certificate PDF: https://openairdocs.org/files/sha256/84/e7/84e745bf36310b3c9218f93fa0dc61c0e789e8211971d6039eb645d61589e78d
- Approved model list and other attachments: [SE04840NY_AML.pdf](https://openairdocs.org/files/sha256/21/c7/21c74a34122f2c388b4a8a772306a35e5c3eefe364760d4b6b2190fcd850c646)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID197629269320240223151633.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/SE04840NY

## ADs that name it (0)

None.

## Approved models (96, first 50)

- CFM International S.A. CFM56-7B20 ([TCDS E00055EN](https://openairdocs.org/tcds/E00055EN))
- CFM International S.A. CFM56-7B20 ([TCDS E00056EN](https://openairdocs.org/tcds/E00056EN))
- CFM International S.A. CFM56-7B20/2 ([TCDS E00055EN](https://openairdocs.org/tcds/E00055EN))
- CFM International S.A. CFM56-7B20/2 ([TCDS E00056EN](https://openairdocs.org/tcds/E00056EN))
- CFM International S.A. CFM56-7B20/3 ([TCDS E00055EN](https://openairdocs.org/tcds/E00055EN))
- CFM International S.A. CFM56-7B20/3 ([TCDS E00056EN](https://openairdocs.org/tcds/E00056EN))
- CFM International S.A. CFM56-7B20E ([TCDS E00055EN](https://openairdocs.org/tcds/E00055EN))
- CFM International S.A. CFM56-7B20E ([TCDS E00056EN](https://openairdocs.org/tcds/E00056EN))
- CFM International S.A. CFM56-7B22 ([TCDS E00055EN](https://openairdocs.org/tcds/E00055EN))
- CFM International S.A. CFM56-7B22 ([TCDS E00056EN](https://openairdocs.org/tcds/E00056EN))
- CFM International S.A. CFM56-7B22/2 ([TCDS E00055EN](https://openairdocs.org/tcds/E00055EN))
- CFM International S.A. CFM56-7B22/2 ([TCDS E00056EN](https://openairdocs.org/tcds/E00056EN))
- CFM International S.A. CFM56-7B22/3 ([TCDS E00055EN](https://openairdocs.org/tcds/E00055EN))
- CFM International S.A. CFM56-7B22/3 ([TCDS E00056EN](https://openairdocs.org/tcds/E00056EN))
- CFM International S.A. CFM56-7B22/3B1 ([TCDS E00055EN](https://openairdocs.org/tcds/E00055EN))
- CFM International S.A. CFM56-7B22/3B1 ([TCDS E00056EN](https://openairdocs.org/tcds/E00056EN))
- CFM International S.A. CFM56-7B22/B1 ([TCDS E00056EN](https://openairdocs.org/tcds/E00056EN))
- CFM International S.A. CFM56-7B22E ([TCDS E00055EN](https://openairdocs.org/tcds/E00055EN))
- CFM International S.A. CFM56-7B22E ([TCDS E00056EN](https://openairdocs.org/tcds/E00056EN))
- CFM International S.A. CFM56-7B22E/B1 ([TCDS E00055EN](https://openairdocs.org/tcds/E00055EN))
- CFM International S.A. CFM56-7B22E/B1 ([TCDS E00056EN](https://openairdocs.org/tcds/E00056EN))
- CFM International S.A. CFM56-7B24 ([TCDS E00055EN](https://openairdocs.org/tcds/E00055EN))
- CFM International S.A. CFM56-7B24 ([TCDS E00056EN](https://openairdocs.org/tcds/E00056EN))
- CFM International S.A. CFM56-7B24/2 ([TCDS E00055EN](https://openairdocs.org/tcds/E00055EN))
- CFM International S.A. CFM56-7B24/2 ([TCDS E00056EN](https://openairdocs.org/tcds/E00056EN))
- CFM International S.A. CFM56-7B24/3 ([TCDS E00055EN](https://openairdocs.org/tcds/E00055EN))
- CFM International S.A. CFM56-7B24/3 ([TCDS E00056EN](https://openairdocs.org/tcds/E00056EN))
- CFM International S.A. CFM56-7B24/3B1 ([TCDS E00055EN](https://openairdocs.org/tcds/E00055EN))
- CFM International S.A. CFM56-7B24/3B1 ([TCDS E00056EN](https://openairdocs.org/tcds/E00056EN))
- CFM International S.A. CFM56-7B24/B1 ([TCDS E00055EN](https://openairdocs.org/tcds/E00055EN))
- CFM International S.A. CFM56-7B24/B1 ([TCDS E00056EN](https://openairdocs.org/tcds/E00056EN))
- CFM International S.A. CFM56-7B24E ([TCDS E00055EN](https://openairdocs.org/tcds/E00055EN))
- CFM International S.A. CFM56-7B24E ([TCDS E00056EN](https://openairdocs.org/tcds/E00056EN))
- CFM International S.A. CFM56-7B24E/B1 ([TCDS E00055EN](https://openairdocs.org/tcds/E00055EN))
- CFM International S.A. CFM56-7B24E/B1 ([TCDS E00056EN](https://openairdocs.org/tcds/E00056EN))
- CFM International S.A. CFM56-7B26 ([TCDS E00055EN](https://openairdocs.org/tcds/E00055EN))
- CFM International S.A. CFM56-7B26 ([TCDS E00056EN](https://openairdocs.org/tcds/E00056EN))
- CFM International S.A. CFM56-7B26/2 ([TCDS E00055EN](https://openairdocs.org/tcds/E00055EN))
- CFM International S.A. CFM56-7B26/2 ([TCDS E00056EN](https://openairdocs.org/tcds/E00056EN))
- CFM International S.A. CFM56-7B26/3 ([TCDS E00055EN](https://openairdocs.org/tcds/E00055EN))
- CFM International S.A. CFM56-7B26/3 ([TCDS E00056EN](https://openairdocs.org/tcds/E00056EN))
- CFM International S.A. CFM56-7B26/3B1 ([TCDS E00055EN](https://openairdocs.org/tcds/E00055EN))
- CFM International S.A. CFM56-7B26/3B1 ([TCDS E00056EN](https://openairdocs.org/tcds/E00056EN))
- CFM International S.A. CFM56-7B26/3B2 ([TCDS E00055EN](https://openairdocs.org/tcds/E00055EN))
- CFM International S.A. CFM56-7B26/3B2 ([TCDS E00056EN](https://openairdocs.org/tcds/E00056EN))
- CFM International S.A. CFM56-7B26/3B2F ([TCDS E00055EN](https://openairdocs.org/tcds/E00055EN))
- CFM International S.A. CFM56-7B26/3B2F ([TCDS E00056EN](https://openairdocs.org/tcds/E00056EN))
- CFM International S.A. CFM56-7B26/3F ([TCDS E00055EN](https://openairdocs.org/tcds/E00055EN))
- CFM International S.A. CFM56-7B26/3F ([TCDS E00056EN](https://openairdocs.org/tcds/E00056EN))
- CFM International S.A. CFM56-7B26/B1 ([TCDS E00055EN](https://openairdocs.org/tcds/E00055EN))

All 96: https://openairdocs.org/stc/SE04840NY/models.md

## 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.

for SE04840NY Kilroy Aviation, LLC 31856 Crosswind Drive, Suite 2 Salisbury, MD 21804 Part 33 Title 14 Code of Federal Regulations * * * See attached FAA Approved Model List (AML) No. SE04840NY for the list of approved engines, applicable installation data, and specific limitations.

1. Installation of HarcoSemco Exhaust Gas Temperature (EGT) Electrical Harnesses in CFM56-7 engine per the Installation Master Drawing List (MDL) document(s) listed on AML No. SE04840NY.

2. Maintenance to be performed in accordance with Instructions for Continued Airworthiness (ICA) document(s) listed on AML No. SE04840NY.

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

(continued on Page 3 of 3) May 21, 2023 February 6, 2024 Christina M. Underwood Manager, East Certification Branch Compliance & Airworthiness Division Aircraft Certification Service 3

SE04840NY 3

SE04840NY Limitations and Conditions (continued):

2. 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.

3. See AML No. SE04840NY for the applicable serial numbers for the engine make-model series.

4. A copy of this certificate and the FAA AML No. SE04840NY must be maintained as part of the permanent records for the modified engine.

Certification Basis:

1. Based on 14 CFR §§ 21.115 and 21.101, and the FAA policy for significant changes in FAA Order 8110.48, this STC is a non-significant change. The certification basis for the engines listed on the AML is as follows:

a. The type certification basis for parts not changed or not affected by the change is as listed on the AML.

b. The type certification basis for parts changed or affected by the change is as listed on the AML.

**END 3 3**

### SE04840NY_AML.pdf

FAA APPROVED MODEL LIST (AML) No SE04840NY Kilroy Aviation, LLC FOR Installation of HarcoSemco EGT Electrical Harnesses in a CFM56-7 engine

Page 1 of 2

ITEM ENGINE MAKE ENGINE MODEL Cert Basis/ Amendment TCDS Installation MDL ICA Model Specific Notes Initial Approve Date Amended Date 1

CFM International, S.A.

CFM56-7B20 CFM56-7B20/2 CFM56-7B20/3 CFM56-7B20E CFM56-7B22 CFM56-7B22/2 CFM56-7B22/B1 CFM56-7B22/3 CFM56-7B22/3B1 CFM56-7B22E CFM56-7B22E/B1 CFM56-7B24 CFM56-7B24/2 CFM56-7B24/B1 CFM56-7B24/3 CFM56-7B24/3B1 CFM56-7B24E CFM56-7B24E/B1 CFM56-7B26/3 CFM56-7B26 CFM56-7B26/2 CFM56-7B26/B1 CFM56-7B26/3B1 CFM56-7B26/3B2F CFM56-7B26/3F CFM56-7B26/B2 CFM56-7B26E CFM56-7B26E/B1 CFM56-7B26E/B2 CFM56-7B26E/B2F CFM56-7B26E/F CFM56-7B27 CFM56-7B27A CFM56-7B27AE CFM56-7B27/3 CFM56-7B27/3F CFM56-7B26/3B2 CFM56-7B27/B1 CFM56-7B27/B3 CFM56-7B27/2 CFM56-7B27/3B1 CFM56-7B27/3B3 CFM56-7B27A/3 CFM56-7B27E/B1 CFM56-7B27/3B1F CFM56-7B27E/B3 CFM56-7B27E CFM56-7B27E/F CFM56-7B27E/B1F Note 6 E00055EN Rev 10 HarcoSemco, LLC S-3839, Rev E, 01/17/2024 (note 3) Kilroy Aviation Document No.

J588-ICA, Rev. “-”, dated July 13, 2023 (note 4) E 1, 2, 5 02/06/2024 N/A 2

CFM International, S.A.

CFM56-7B20 CFM56-7B20/2 CFM56-7B20/3 CFM56-7B20E CFM56-7B22 CFM56-7B22/2 CFM56-7B22/B1 CFM56-7B22/3 CFM56-7B22/3B1 CFM56-7B22E CFM56-7B22E/B1 CFM56-7B24 CFM56-7B24/2 CFM56-7B24/B1 CFM56-7B24/3 CFM56-7B24/3B1 CFM56-7B24E CFM56-7B24E/B1 CFM56-7B26/3 CFM56-7B26 CFM56-7B26/2 CFM56-7B26/B1 CFM56-7B26/3B1 CFM56-7B26/3B2F CFM56-7B26/3F CFM56-7B26/B2 CFM56-7B26E CFM56-7B26E/B1 CFM56-7B26E/B2 CFM56-7B26E/B2F CFM56-7B26E/F CFM56-7B27 CFM56-7B27A CFM56-7B27AE CFM56-7B27/3 CFM56-7B27/3F CFM56-7B26/3B2 CFM56-7B27/B1 CFM56-7B27/B3 CFM56-7B27/2 CFM56-7B27/3B1 CFM56-7B27/3B3 CFM56-7B27A/3 CFM56-7B27E/B1 CFM56-7B27/3B1F CFM56-7B27E/B3 CFM56-7B27E CFM56-7B27E/F CFM56-7B27E/B1F Note 6 E00056EN Rev 10 HarcoSemco, LLC S-3839, Rev E, 01/17/2024 (note 3) Kilroy Aviation Document No.

J588-ICA, Rev. “-”, dated July 13, 2023 (note 4) E 1, 2, 5 02/06/2024 N/A

FAA APPROVED MODEL LIST (AML) No SE04840NY Kilroy Aviation, LLC FOR Installation of HarcoSemco EGT Electrical Harnesses in a CFM56-7 engine

Page 2 of 2

General Notes:

E- Engine, SUR-Surrendered, SUS-Suspended, REV-Revoked

1. No change to airplane Instructions for Continued Airworthiness nor Airworthiness Limitations.

2. No change to Airplane Flight Manual

3. Or later FAA-approved revision

4. Or later FAA-accepted revision

5. This STC is applicable only to serial numbers for CFM56-7 series engines that have undergone modifications as specified in these CFM International service bulletins:

SB 72-0022 R.01 SB 72-0093 R.00 SB 73-0058 R.01 SB 73-0085 R.01 SB 73-0089 R.01 SB 73-0198 R.01

6. 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 this modification is as follows:

a. The type certification basis for parts not changed or not affected by the change is shown on the TCDS listed in the table above.

b. The certification basis for parts changed or affected by the change since the reference date of application, May 21, 2023, is based on Part 33 as amended by 33-29 and is as follows:

Regulations at amendment 33-0 through 33-29:

§33.4 [Amdt 33-9], §33.15(a)(b) [Amdt 33-10], §33.17(a) [Amdt 33-29], §33.29(a) [Amdt 33-26], §33.75 [Amdt 33-10], §33.89(b) [Amdt 33-10].

FAA Approved:

For Christina M. Underwood Manager, East Certification Branch Compliance & Airworthiness Division Aircraft Certification Service

## Every issue (1)

- February 6, 2024: Issued, Current. [certificate](https://openairdocs.org/files/sha256/84/e7/84e745bf36310b3c9218f93fa0dc61c0e789e8211971d6039eb645d61589e78d), [SE04840NY_AML.pdf](https://openairdocs.org/files/sha256/21/c7/21c74a34122f2c388b4a8a772306a35e5c3eefe364760d4b6b2190fcd850c646)

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