STC SA2479CE

This certificate, issued to: Avcon Division/Butler National Corp.

P. O. BOX 748 City-County Airport Newton, KS 67114

Part 25 of the Federal Aviation Regulations.

Original Product--Type Certificate Number: A10CE

Make: Learjet

Model: 35, 35A, 36 and 36A Description of Type Design Change:

The installation of dual openable hatches on the belly of the fuselage per Avcon Master Drawing list 1054, Rev A, dated 15 April, 2005, or later FAA approved revision.

1) These Airplanes are in Restricted Category when the camera pod modification and associated hardware is installed.

2) FAA Approved Flight manual Supplement number 6 change 1 dated June 30, 2005, or later FAA Approved revision is required equipment when this modification is installed.

3) This STC is not applicable only to Learjet Models modified by ECR 1446 or 1559. It applies only to Learjet models 35, 35A, 36 and 36A with a maximum operating pressure altitude of 45,000 feet.

4) Hatch opening during flight operations has not been tested or demonstrated.

5) The installer must determine compatibility of this design change 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.

This certificate and the supporting data, which is the basis for approval, shall remain in effect until surrendered, suspended, revoked or a termination date is otherwise established by the Administrator of the Federal Aviation Administration.

Date of application: January 14, 1988 Date reissued:

Date of issuance: March 31, 1989 Date amended: June 30, 2005 By direction of the Administrator:

(Signature) Grant Youngdahl Program Manager Wichita Aircraft Certification Office

(Title)