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Aircraft STC directory

Twin Commander Aircraft 685 STCs

The Jun 30, 2026 FAA DRS snapshot contains 25 selected supplemental type certificates with status Current whose public applicability data names the Twin Commander Aircraft 685. Use it to identify modification scope and recorded holders—not to determine serial-number effectivity, compatibility, installation approval, or commercial availability.

25
listed Current at snapshot
18
holder directories
7
modification categories
Jun 3, 2025
latest recorded revision

Modification demand surface

Fuel systems8
Other aircraft modifications6
Avionics4
Landing gear and brakes3
Electrical systems2
Flight controls1
Cargo and special mission1

Recorded holders

Floats & Fuel Cells7Kaman Corporation Aircraft Wheel and Brake LLC2BHE & Associates LTD1Metrea Special Aerospace ISR Inc.1Acron Aviation Inc.1S-TEC Corporation1LifePort LLC1Paul/ Lanna Egan LLC1Aircraft Components Inc1Continental Motors, Inc.1Brittain Industries, Inc1Fliegen Works Inc.1FFC Manufacturing1Quiet Flight LLC1Learjet Inc.1Signature Flight Support Corporation1DeVore Aviation Corporation of America, a New Mexico Corporation1SMR Technologies1

Recently revised 685 STCs

Showing the 25 most recently revised records. Each entry links to the FAA source and separates public approval data from private commercial claims.

SA1177GLElectrical systems

Install Aero Medical Products Mfg., Inc. Air Ambulance Stretcher P/N 125 using Installation Kit P/N 800 in accordance with Installation and Operating Instructions, Form EA 109K, dated April 23, 2001, or later FAA approved revisions. The Medical Oxygen System Kit P/N 807 is an FAA approved option. The Inverter/Pump Kit No. 812 may be installed in accordance with Inverter/Pump Installation Instructions, EA Form 170, dated June 9, 2001, or later FAA approved revisions.

FAA holder: Paul/ Lanna Egan LLC

View record