Based on information in AIP Lithuania:
From January 1, 2005 noise abatement procedures for Kaunas International Airport should be applied in accordance to Regulations on the Limitation of Operation of Civil Subsonic Jet Aeroplanes at the Airports of the Republic of Lithuania approved by Order No. 428/574 issued December 2, 2001 by the Minister of Transport and Communications and the Minister of Environment of the Republic of Lithuania.
Limitation of civil subsonic jet aeroplanes (hereinafter - "aeroplanes") operating to and from the airports of the Republic of Lithuania shall be established by the following regulations.
1. The regulations shall be applied to the aeroplanes with a maximum take-off mass of 34,000 kg or more and with a certified maximum internal accommodation consisting of more than nineteen passenger seats excluding any seats for crew only.
2. Civil subsonic jet aeroplanes fitted with engines having a by-pass ratio of less than two can not operate unless granted noise certification either:
a) to the standards specified in Part II Chapter 3 Volume 1 of Annex 16 to the Convention on International Civil Aviation (hereinafter - " Convention") or
b) to the standards specified in Part II Chapter 2, Volume 1 of Annex 16 to the aforesaid Convention, provided that they were first issued an individual certificate of airworthiness less than 25 years previously.
3. Exemption from the requirements laid down in paragraph 2 of these regulations shall be granted to aeroplanes which do not meet the standards specified in Part II, Chapter 3 Volume 1 of Annex 16 of the Convention, but which can be altered to meet those standards, provided that:
a) suitable conversion equipment exists and is actually available for the aeroplane type in question;
b) aeroplanes fitted with such equipment meet the standards of Part II, Chapter 3, Volume 1 of Annex 16 to the Convention;
c) an air operator has ordered the equipment mentioned in paragraph 3a) by 1 January 2003 and has commissioned itself to install it until 1 January 2004.
4. The Civil Aviation Administration may permit the operation of aeroplanes which do not meet the requirements laid down in paragraph 2 of these regulations at the airports of the Republic of Lithuania. This exemption shall be limited to aeroplanes of historical interest and to:
a) aeroplanes whose operations are of such an exceptional nature that it would be unreasonable to withhold an exemption;
b) aeroplanes on non-revenue flights for the purposes of alteration, repair or maintenance.