STC ST00276BO

249 Vanderbilt Avenue Norwood, MA 02062

Part 25 of the Federal Aviation Regulations.

Original Product Type Certificate Number: A16SW Make: Raytheon Aircraft Company Model: 400A Description of Type Design Change:

Installation of Pratt & Whitney Engine Services Data Transmission Unit (DTU) in accordance with Pratt & Whitney Engine Services Master Document List DTU-T-100-6, Rev D, dated May 29, 2008 or later FAA-approved revision.

Pratt & Whitney Engine Services Installation Instructions DTU-G-010-9 is applicable to this installation.

1. Instructions for Continued Airworthiness (ICA) DTU-G-260-9, Rev A, dated April 4, 2008 or later FAA- accepted revision, shall be made available to the operator at the time of installation.

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

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.

Date of application : November 5, 2007

Date of issuance : September 26, 2008

( Signature) Robert G. Mann Manager Boston Aircraft Certification Office

( Title)

FAA Form 8110-2-1(10-69) Page 2 of 2

Number ST00276BO

Certification Basis :

Model 400A Based on 14 CFR §§ 21.115 and 21.101, the certification basis for the Installation of Pratt & Whitney Engine Services Data Transmission Unit (DTU) in Raytheon Aircraft Company Model 400A is as referenced on TCDS A16SW, Revision 22, dated September 22, 2006.

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