# Lockheed AT 18 - Type: Aircraft model (FAA registry) - Registry code: 5261558 - Manufacturer (registry): LOCKHEED - Model: AT 18 - Aircraft type: Fixed wing multi engine - Category: Airplane - Engines: 2 · Reciprocating - Seats: 6 - Weight class: 12,500 to 19,999 lb - Certification: Type certificated - Data sheet: [TCDS A-723](https://openairdocs.org/tcds/A-723) (OpenAirDocs) - Holder: Lockheed Martin Aeronautics Company - Registered aircraft: 0 - Page: https://openairdocs.org/model/lockheed-at-18 Model codes come from the FAA registry's reference file. ADs are matched to them by model name and maker. ## ADs that may apply (OpenAirDocs) Matched to this model by model name and maker. Each AD's applicability may narrow it by serial number, part number or equipment. - [AD 2026-13-02](https://openairdocs.org/ad/2026-13-02): Navigation · Airbus Canada Limited Partnership 18, 49-46, 80-A and 555 more. Effective Jul 1, 2026 - [AD 2023-10-02](https://openairdocs.org/ad/2023-10-02): Indicating/Recording System, Navigation · Boeing 18, 23, 35 and 1,060 more. Effective May 26, 2023 - [AD 2005-01-19](https://openairdocs.org/ad/2005-01-19): Mode S transponders · GARMIN International GTX 330D, GTX 330, GTX 33D and 830 more. Effective Feb 23, 2005 - [AD 99-19-08](https://openairdocs.org/ad/99-19-08): AFM - Deicing · Lockheed 14-H, 14-H2, 14-N and 3 more. Effective Dec 27, 1999 - [AD 98-04-32](https://openairdocs.org/ad/98-04-32): AFM - Limitations Section - Icing · Lockheed 14-H, 14-H2, 14-N and 3 more. Effective Mar 25, 1998 - [AD 93-14-12](https://openairdocs.org/ad/93-14-12): Crewmember Protective Breathing Equipment Units · Airbus A300 B2-1A, A300 B2-1C, A300 B2-203 and 201 more. Effective Sep 2, 1993 - [AD 77-10-03](https://openairdocs.org/ad/77-10-03): Fire Resistant Prop Feathering System · Lockheed 18. Effective Jun 16, 1977 - [AD 66-02-01](https://openairdocs.org/ad/66-02-01): Air Conditioners · Beechcraft 56TC, 58, 58A and 39 more. Effective Feb 10, 1966 - [AD 63-21-04](https://openairdocs.org/ad/63-21-04): Elevator Trim Tabs · Air Trading Navy PV-1 and 18. Effective Jan 10, 1964 - [AD 63-03-03](https://openairdocs.org/ad/63-03-03): Main Landing Gear Drag Strut · Lockheed 18. Effective Mar 5, 1963 - [AD 61-22-06](https://openairdocs.org/ad/61-22-06): Elevator Control Mast Castings · Air Trading Army B-34, Navy PV-1 and 18. Effective Nov 21, 1961 - [AD 60-21-02](https://openairdocs.org/ad/60-21-02): Carburetor Preheat Modification · Lockheed 18 - [AD 59-16-02](https://openairdocs.org/ad/59-16-02): Stabilizer Spar · Air Trading Army B-34, Navy PV-1 and 18 - [AD 58-11-03](https://openairdocs.org/ad/58-11-03): Rudder Cable Attachment · Air Trading Navy PV-1 and 18 - [AD 58-11-02](https://openairdocs.org/ad/58-11-02): Landing Gear Drag Strut Yoke · Lockheed 18 - [AD 58-08-03](https://openairdocs.org/ad/58-08-03): CB Fire Extinguisher System · Air Trading Navy PV-1, DC3-G102, DC3-G102A and 13 more - [AD 57-23-01](https://openairdocs.org/ad/57-23-01): Vacuum System Fusible Plug · Lockheed 18 - [AD 52-08-01](https://openairdocs.org/ad/52-08-01): Fuel Tank Seal · Lockheed 18 - [AD 48-42-02](https://openairdocs.org/ad/48-42-02): Fire Prevention Modification · Lockheed 18 - [AD 47-43-11](https://openairdocs.org/ad/47-43-11): Elevator Push-Pull Rod Bolts · Lockheed 18 - [AD 47-43-10](https://openairdocs.org/ad/47-43-10): Fire Extinguisher Bottle Rework · Lockheed 18 - [AD 46-13-03](https://openairdocs.org/ad/46-13-03): Hopper Oil Tanks · Lockheed 18 - [AD 46-13-02](https://openairdocs.org/ad/46-13-02): Dual Fuel System · Lockheed 18 - [AD 46-13-01](https://openairdocs.org/ad/46-13-01): Landing Gear Hose Ferrules · Lockheed 18 ## Registered aircraft None registered with this model now. ## NTSB investigations None matched to aircraft with this model. ## FAA accident and incident reports None matched to aircraft with this model. ## The same model under other registry codes Amateur-built copies and renamed makers get their own codes. - [Lockheed 18](https://openairdocs.org/model/lockheed-18): 2 registered aircraft, registry code 5261602 - [Stengl JW Ttee/Stengl CS Ttee 18](https://openairdocs.org/model/stengl-jw-ttee-stengl-cs-ttee-18): 1 registered aircraft, registry code 056246N - [Swift 18](https://openairdocs.org/model/swift-18): 1 registered aircraft, registry code 056263F - [Wildwood 18](https://openairdocs.org/model/wildwood-18): 1 registered aircraft, registry code 05904F7 - [Taylorcraft 18](https://openairdocs.org/model/taylorcraft-18): 0 registered aircraft, registry code 8850850 - [Umbaugh 18](https://openairdocs.org/model/umbaugh-18): 0 registered aircraft, registry code 9200202 --- OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.