STC SA1573NM

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Number: SA1573NM This certificate issued to: Learjet Inc.

1255 E. Aero Park Blvd.

Tucson, AZ 85706 Part 25 of the Federal Aviation Regulations Original Product -Type Terlificate Number: A10CE Make: Gates Learjet Model: 35A Description of Type Design Change:

Replacement of the existing fan speed indicators (N1), turbine speed indicators (N2), and interstage turbine temperature indicators (ITT) with Intercontinental Dynamics Corporation (IDC) indicators as indicated on Combs Gates Denver Drawing list DOC 1-2043, revision B, FAA approved December 22, 1983 or later FAA approved revision.

1. FAA approved Airplane Flight Manual Supplement, dated December 22, 1983, or later FAA approved revision is required.

2. This approval should not be extended to other aircraft of this model on which other previously approved modifications are incorporated unless it is determined that the interrelationship between this change and any other previously approved modification will introduce no adverse effect upon the airworthiness of the aircraft.

Date of Application: June 15, 1983 Date Reissued: January 4, 1995, March 7, 2002 Date of Issuance: December 23, 1983 Date Amended:

FEDERAL By Direction of the Administrator oro David T. Grossman (Signature) Acting Manager Denver Aircraft Certification Office.

Northwest Mountain Region, Denver, Colorado (Title)