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.

Mk VI Ground Proximity Warning System installed.

Installation of the (1) Honeywell MK V Enhanced Ground Proximity Warning System or (2) the Honeywell MK VII EGPWS

Installation of an AV557D cockpit voice recorder.

Installation of the Bendix/King KLN 90B Global Positioning System (GPS) for IFR enroute and approach operation

Installation of Norton radome kit No. 2090XS.

Installation of S-TEC System 20/30 Single and Two Axis Automatic Flight Guidance Systems, Model ST-726-20/30.

Installation of Collins AP-104/FD-109F Flight Control System.

Installation of Mitchell automatic flight system AK422/FD consisting of Century IV autopilot/flight director with command electric trim.

Installation of Collins AP104/FD109H Flight Control System.