The use of Hand-held fire extinguishers containing Halon in Aircraft will become prohibited end of 2025 and you will need to replace all them.

D204-575/D205-576 Cabin Heating Systems, Transport Canada STC SH92-20 Issue 2 dated 14 May 1992 EASA.IM.R.S.01398 TCCA STC SH92-20, ISSUE 2; FAA

Reduction of seating configuration to 9 passengers.

Installation of Serviceability Kit: Auxiliary cowl latches, cockpit door wear pads and cabin door handle.

Replace existing nickel cadium battery with Teledyne Gill G-6381 series lead acid battery.

Installation of H.D.P.E. cabin door rails.

Nine place seating configuration.

Replacement of existing landing and/or hover light bulbs with Light Emitting Diode (LED) lighting system

Installation of MASS Systems Fire Extinguisher Cartridge asreplacement for Walter Kidde Aerospace fire extinguisher cartridges in fire extinguisher bottles installed in the airplane models noted on the EASA approved model list dtd 02 April 2008 (which excludes aircraft models not validated by EASA)... EASA.IM.A.S.01853 FAA STC ST00961LA

Installation of Bleed Air cabin heating system.