Aircraft STC directory
Lockheed Martin Aeronautics 18 STCs
The Jun 30, 2026 FAA DRS snapshot contains 145 selected supplemental type certificates with status Current whose public applicability data names the Lockheed Martin Aeronautics 18. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.
Modification demand surface
Recently revised 18 STCs
Showing the 100 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.
Short stack installation - Pratt & Whitney R-1830 or Wright R-1820 engines.
FAA holder: Sabreliner Aviation LLC
Nose heater installation, Stewart-Warner Model 940-B24.
FAA holder: Sabreliner Aviation LLC
DC-3 exhaust collector ring and short stack installation.
FAA holder: Sabreliner Aviation LLC
Installation of landing gear doors.
FAA holder: Signature Flight Support Corporation
Installation of alcohol deicing system.
FAA holder: Signature Flight Support Corporation
Installation of empennage saddle-back fairing.
FAA holder: Signature Flight Support Corporation
Installation of tail cone.
FAA holder: Signature Flight Support Corporation
Installation of electric trim tab servo.
FAA holder: Signature Flight Support Corporation
Installation of oxygen system.
FAA holder: Signature Flight Support Corporation
Installation of air conditioner.
FAA holder: Signature Flight Support Corporation
Firewall fluid shutoff valve installation.
FAA holder: Signature Flight Support Corporation
Installation of Scene-A-Ramic cabin windows.
FAA holder: Signature Flight Support Corporation
Installation of Mighty Midget hydraulic selector (flap and gear).
FAA holder: Signature Flight Support Corporation
Installation of cockpit side windows.
FAA holder: Signature Flight Support Corporation
Installation of electric trim actuator.
FAA holder: Signature Flight Support Corporation
Installation of Emergency Fluid Shut-Off Valves.
FAA holder: Signature Flight Support Corporation
Installation of anti-collision lights.
FAA holder: Signature Flight Support Corporation
Installation of 36-inch length picture windows between Stations 279 and 392.
FAA holder: Signature Flight Support Corporation
Installation of flight line nose heater.
FAA holder: Signature Flight Support Corporation
Rudder anti-overbalance springs.
FAA holder: Signature Flight Support Corporation
Main landing gear and tail gear metering pins modified.
FAA holder: Signature Flight Support Corporation
Installation of elevator spring tab, trim tab, nose down spring and elevator bellcrank station 561.
FAA holder: Signature Flight Support Corporation
Hydraulic system pressure increase to 1050 p.s.i.
FAA holder: Signature Flight Support Corporation
Installation of picture windows and/or emergency exit.
FAA holder: Signature Flight Support Corporation
Installation of integrated alcohol system.
FAA holder: Signature Flight Support Corporation
Installed a Lear rotary electric actuator No. 164EK in carburetor air control valve linkage.
FAA holder: Signature Flight Support Corporation
Installation of VOR antenna on vertical fin.
FAA holder: Signature Flight Support Corporation
Fuel tank access port cover wing centersection L-18.
FAA holder: Signature Flight Support Corporation
Installation of anti-ice system.
FAA holder: Signature Flight Support Corporation
Modification to hydraulic system.
FAA holder: Signature Flight Support Corporation
Installation of Dual Jato.
FAA holder: Signature Flight Support Corporation
Installation of de-icer boot vacuum system.
FAA holder: Signature Flight Support Corporation
Installation of short horizontal stabilizer tips and related equipment.
FAA holder: Signature Flight Support Corporation
Installation of flap speed restricting system L-18.
FAA holder: Signature Flight Support Corporation
Increase incidence of horizontal stabilizer.
FAA holder: Signature Flight Support Corporation
Centersection structural rework.
FAA holder: Signature Flight Support Corporation
Rudder and aileron interconnect installation.
FAA holder: Signature Flight Support Corporation
Installation of fuel dump systems.
FAA holder: Signature Flight Support Corporation
Modification of powerplant installation.
FAA holder: Signature Flight Support Corporation
Propeller autofeathering system installation.
FAA holder: Signature Flight Support Corporation
Installation of stall warning system.
FAA holder: Signature Flight Support Corporation
Installation of L712006-502 or503 Airspeed System.
FAA holder: Signature Flight Support Corporation
Stall warning system.
FAA holder: Signature Flight Support Corporation
Increase gross weight to 22,050 pounds takeoff and 20,500 pounds landing.
FAA holder: Signature Flight Support Corporation
Installation of PV-1 oil tank modified to 20 US gallons.
FAA holder: Signature Flight Support Corporation
Installation of airspeed system.
FAA holder: Signature Flight Support Corporation
Installation of Grimes rotating beacon P/N G5-790B or G-6965-2.
FAA holder: Signature Flight Support Corporation
A section of the forward spar inside fuselage altered.
FAA holder: Signature Flight Support Corporation
Cockpit side windows enlarged and structure altered.
FAA holder: Signature Flight Support Corporation
The anti-icer system altered to incorporate all anti-icer fluid into one tank rather than the original four-tank system.
FAA holder: Signature Flight Support Corporation
Installation of 200 amp generator system.
FAA holder: Signature Flight Support Corporation
Alter cabin windows on R.H. side of fuselage.
FAA holder: Signature Flight Support Corporation
Alter cabin windows on R.H. side of fuselage.
FAA holder: Signature Flight Support Corporation
Warren McArthur chair model 225 installed in cockpit for pilot and co-pilot chairs.
FAA holder: Signature Flight Support Corporation
Installation of radar antenna, radome nose and fairing.
FAA holder: Signature Flight Support Corporation
Installation of Sperry A-12 autopilot.
FAA holder: Signature Flight Support Corporation
Installation of L-18 radome kit.
FAA holder: Signature Flight Support Corporation
Installation of exhaust trough and short stack using standard nacelle.
FAA holder: Signature Flight Support Corporation
Installation of auxiliary electric hydraulic pump.
FAA holder: Signature Flight Support Corporation
Installation of 100,000 BTU Janitrol Heater in nose. (LOCKHEED 18 S/N 2477; 2309 only).
FAA holder: Signature Flight Support Corporation
Installation of flush loop antenna.
FAA holder: Signature Flight Support Corporation
Installation of Surface Combustion Corporation Janitrol heater Model S100, 100,000 BTU output.
FAA holder: Signature Flight Support Corporation
Installation of extended tail cone fairing.
FAA holder: Signature Flight Support Corporation
Modification of flap and trailing edge.
FAA holder: Signature Flight Support Corporation
Installation of new engine nacelle cowling and related equipment.
FAA holder: Signature Flight Support Corporation
Installation of right and left cockpit dome windows.
FAA holder: Signature Flight Support Corporation
Installation of 200 amp generator system.
FAA holder: Signature Flight Support Corporation
Installation of windshield and propeller anti-ice system.
FAA holder: Signature Flight Support Corporation
Installation of Janitrol S-200 heater, P/N 20C65, System (derated to 150 BTU).
FAA holder: Signature Flight Support Corporation
Installation of wheel well doors.
FAA holder: Signature Flight Support Corporation
Installation of fuel flow system.
FAA holder: Signature Flight Support Corporation
Installation of cabin seats.
FAA holder: Signature Flight Support Corporation
Installation of three place couch.
FAA holder: Signature Flight Support Corporation
Installation of cockpit seats.
FAA holder: Signature Flight Support Corporation
Installation of 'Two Shot C02 System Installation.'.
FAA holder: Signature Flight Support Corporation
Installation of Bendix radar RDR-1 system not covered by SA4-72 (Lear Radome Installation).
FAA holder: Signature Flight Support Corporation
Installation of Edison continuous fire detection system.
FAA holder: Signature Flight Support Corporation
Installation of horizontal stabilizer short fiberglass tip.
FAA holder: Signature Flight Support Corporation
Installation of airspeed system.
FAA holder: Signature Flight Support Corporation
Installation of Warren McArthur chair Model 225 or 239 for pilot and co-pilot.
FAA holder: Signature Flight Support Corporation
Installation of airspeed system.
FAA holder: Signature Flight Support Corporation
Installation of picture window.
FAA holder: Signature Flight Support Corporation
Installation of fuel flow indicator.
FAA holder: Signature Flight Support Corporation
Installation of picture windows.
FAA holder: Signature Flight Support Corporation
Empennage modifications.
FAA holder: Signature Flight Support Corporation
Installation of electrical system.
FAA holder: Signature Flight Support Corporation