AD 80-07-09

80-07-09 LEARJET: Amendment 39-3724. Applies to the following models or series and serial number airplanes certificated in all categories:

NOTE: A "series" includes all models in a number series, i.e., 25 series includes Models 25, 25A, 25B, 25C, etc.

MODEL OR SERIES SERIAL NUMBERS 23 (Model) 23-003 through 23-099 24 (Series) 24-100 through 24-357 25 (Series) 25-003 through 25-291 28 (Model) 28-001 through 28-005 29 (Model) 29-001 and 29-002 35 (Series) 35-001 through 35-274 and 35-278 36 (Series) 36-001 through 36-044

COMPLIANCE: Required as indicated unless already accomplished.

To assure that the cabin main entrance upper door will open, in the event of an emergency, accomplish the following:

A) Within the next 150 hours time-in-service after the effective date of this Airworthiness Directive (AD), modify the cabin main entrance upper door by, (1) Drilling access holes, installing new mechanism pivot bolts drilled for safety wire and drilling safety wire holes in surrounding structure, as applicable, and (2) safety wiring the bolts, all in accordance with instructions in Gates Learjet Corporation Airplane Modification Kit Number AMK79-9.

B) Issuance of a special flight permit in accordance with FAR 21.197 is permitted for the purpose of moving affected airplanes to a location where the modification required by this AD can be accomplished.

C) Any equivalent means of compliance with this AD must be approved by the Chief, Wichita Engineering and Manufacturing District Office, Federal Aviation Administration, Room 238, Terminal Building No. 2299, Mid-Continent Airport, Wichita, Kansas 67209; telephone (316) 942-4219.

This amendment becomes effective May 1, 1980.