# STC SA2740SW

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: Blackhawk Modifications Inc., United States
- Description: Installation of P&W Canada PT6A-135 engines and bleed air conditioning and pressurization system.
- Applied: January 29, 1976
- Status date: September 5, 2003
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS 3A20](https://openairdocs.org/tcds/3A20)
- Certificate PDF: https://openairdocs.org/files/sha256/20/10/201015ae4c32bb72e53ae1b7dc6cc322a1f12e17fcbaa87179e50bf884df4ec2
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/881564585866844686256DF800750A19.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA2740SW

## ADs that name it (0)

None.

## Approved models (6)

- Beechcraft Corporation 65-90 ([TCDS 3A20](https://openairdocs.org/tcds/3A20))
- Beechcraft Corporation 65-A90 ([TCDS 3A20](https://openairdocs.org/tcds/3A20))
- Beechcraft Corporation B90 ([TCDS 3A20](https://openairdocs.org/tcds/3A20))
- Beechcraft Corporation C90 ([TCDS 3A20](https://openairdocs.org/tcds/3A20))
- Beechcraft Corporation C90A ([TCDS 3A20](https://openairdocs.org/tcds/3A20))
- Beechcraft Corporation E90 ([TCDS 3A20](https://openairdocs.org/tcds/3A20))

## What the certificate says

This is OCR from the scanned FAA certificate. OCR can misread letters and numbers.

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Project Number SA7431SC-A, PWH Number $A27405W This certificate issued to: Blackhawk Modifications, Inc., a Nevada Corporation 1800 E. Sahara Drive Las Vegas, NV 89108 Certifies that the change in the type design for the following preduct with the limitations and conditions therefer as specified hereen meets the airwerthiness requireneats of Surt 3 of the Civil Air Regulations.

Original Product Type Certificate Vamber: 3A20 Autie : Raytheon Aircraft Co.

Model: 65-90; 65-A90; B90; C90; C90A; E90 Description of Type Design Change:

Option 1: Installation of Pratt & Whitney Canada PT6A-135 engines and bleed air conditioning and pressurization system in accordance with Taurus-King Air Drawing List RO4-16, Rev. K dated February 6, 1979, or later FAA approved revision.

(See continuation sheet 3 of 3) Limitations and Conditions: . FAA Approved Airplane Flight Manual Supplement (AFMS) dated April 28, 1978, is required for Beech Model 65-A90. (Option 1) (See continuation sheet 3 of 3) Administrater of the Federal Aviation Administration Date of Application: January 29, 1976 Date Reissued: 11-13-02 Lute of suance: March 24, 1978 Date Amended: 5-1-78; 11-27-78; 2-23-79; 3-31-81:

1-9-03; 9-5-03, Rev. 6 ÇEDERAL AVIATION By Direction of the Administrator Thill Thit (Signature) TOMINISTRATO S. Frances Cox. Manager Special Certification Office, Southwest Region (Title)

FAA Form 8110-2 (10-6B) Page 1 of 3

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: SA27405W Date of Issuance: March 24. 1978 Date Amended: September 5. 2003 Description of Type Design Change: (Continued):

Option 2: Installation of Pratt & Whitney Canada PT6A-135A engines in accordance with Blackhawk Modification, Inc. Drawing No. 18001-01, dated September 20, 2002, "Installation Instructions", or later FAA approved revision.

Option 3: Installation of Pratt & Whitney Canada PT6A-135A engines and Hartzell four bladed HC-D4N-3C/D9290SK or HC-E4N-3N/D8990SK propellers in accordance with Blackhawk Modifications, Inc., Drawing No. 19003-01, Rev. IR, dated August 4, 2003, "Installation Instructions", or later FAA approved revision.

Limitations and Conditions: (Continued):

1. FAA Approved AFMS dated February 23, 1979, is required for Beech Model B90.

(Option 1)

2. FAA Approved AFMS dated February 23, 1979, is required for Beech Model C90.

(Option 1) The following Beech Kit is eligible for the Model 65-A90, P/N 90-4026. The following Beech Kits are not eligible with this installation P/N 90-4031, P/N 90-4031-1, P/N 90-4032, P/N 90-4032-1, and P/N 90-4035. M4C Autopilots in accordance with STC SA296CE and SA547CE with SAGA modifications, Mitchell Century III in accordance with STC SA761SW and SAGA modifications and H14 autopilot as factory installed by Beech are approved. Mitchell Century IV in accordance with STC SA3042SW-D and SAGA modifications is approved.

(Option 1)

4. The Center of Gravity limits are restricted to those shown on the Airplane Flight Manual (AFM).

5. Each modified airplane must be flight checked in accordance with SAGA Report RO4-37 dated 11/1/78, or later FAA approved revision. (Option 1)

6. FAA Approved AFMS Document No. AFMS 19001, dated January 9, 2003, or later FAA approved revision is required for the Raytheon (Beech) C90 airplane with Pratt & Whitney Canada PT6A-135A engines. (Option 2) /. FAA Approved AFMS Document No. AFMS 19003-00, Rev. IR, dated September 5, 2003, or later FAA approved revision is required for the Raytheon (Beech) C90, C90A, or E90 airplane with Pratt & Whitney Canada PT6A-135A engines.

(Option 3) Compatibility of this design change with previously approved modifications must be determined by the installer. If the holder agrees to permit another person to use this certificate to alter the product, the holder shall give the other person written evidence of that permission.

d00, or imprisonment not exceeding 3 years, or both FAA Form 8110-2-1110-691 Page 3 of 3 This certificate may be transferred in accordance with FAR 2147.

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) (Address of transferee) (Number and street) (City, State, and ZIP code) from (Name of grantor) (Print or type) (Address of grantor) (Number & street) (City, State, and ZIP code) Extent of Authority (if licensing agreement):

Signature of grantor (In ink) :

## Every issue (1)

- September 5, 2003: Amended, Current. [certificate](https://openairdocs.org/files/sha256/20/10/201015ae4c32bb72e53ae1b7dc6cc322a1f12e17fcbaa87179e50bf884df4ec2)

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