# Air Tractor AT-400A

- Type: Aircraft model (FAA registry)
- Registry code: 0390203
- Manufacturer (registry): AIR TRACTOR INC
- Model: AT-400A
- Aircraft type: Fixed wing single engine
- Category: Airplane
- Engines: 1 · Turbo-prop
- Seats: 1
- Weight class: Up to 12,499 lb
- Certification: Type certificated
- Data sheet: [TCDS A9SW](https://openairdocs.org/tcds/A9SW) (OpenAirDocs)
- Holder: Air Tractor Inc.
- Registered aircraft: 19
- Page: https://openairdocs.org/model/air-tractor-at-400a

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 2021-05-14](https://openairdocs.org/ad/2021-05-14): TE flap control system · Air Tractor AT-250, AT-300, AT-301 and 19 more. Effective Apr 29, 2021
- [AD 2009-11-05](https://openairdocs.org/ad/2009-11-05): Cracks in the engine mount · Air Tractor AT-400, AT-400A, AT-402 and 9 more. Effective Jun 1, 2009
- [AD 2008-26-01](https://openairdocs.org/ad/2008-26-01): Overturn skid plate kit · Air Tractor AT-250, AT-300, AT-301 and 15 more. Effective Jan 28, 2009
- [AD 2008-09-10](https://openairdocs.org/ad/2008-09-10): Aluminum spar caps · Air Tractor AT-300, AT-301, AT-302 and 2 more. Effective May 8, 2008
- [AD 2005-13-12](https://openairdocs.org/ad/2005-13-12): Front and rear spar of the horizontal stabilizer · Air Tractor AT-300, AT-301, AT-302 and 11 more. Effective Aug 5, 2005
- [AD 2003-07-04](https://openairdocs.org/ad/2003-07-04): Vertical Fin Front Spar Fittings · Air Tractor AT-300, AT-400, AT-400A and 8 more. Effective May 22, 2003
- [AD 98-25-01](https://openairdocs.org/ad/98-25-01): Flap Actuator Overtravel Stop · Air Tractor AT-300, AT-301, AT-302 and 13 more. Effective Jan 19, 1999
- [AD 97-14-05](https://openairdocs.org/ad/97-14-05): Fin Front Spar Attachment Fittings · Air Tractor AT-301, AT-302, AT-400 and 5 more. Effective Aug 25, 1997
- [AD 96-24-08](https://openairdocs.org/ad/96-24-08): Parking Brake Valve · Air Tractor AT-250, AT-300, AT-301 and 7 more. Effective Dec 23, 1996
- [AD 92-07-14](https://openairdocs.org/ad/92-07-14): Wing Structure · Air Tractor AT-300, AT-301, AT-302 and 2 more. Effective May 8, 1992
- [AD 82-06-12](https://openairdocs.org/ad/82-06-12): Main Landing Gear Struts · Air Tractor AT-300, AT-301, AT-302 and 2 more. Effective Mar 25, 1982

Historical (superseded or no longer in force):

- [AD 2008-11-17](https://openairdocs.org/ad/2008-11-17) (historical): Overturn skid plate in the cockpit area · Air Tractor AT-250, AT-300, AT-301 and 14 more. Effective Jul 7, 2008
- [AD 2008-10-12](https://openairdocs.org/ad/2008-10-12) (historical): Cracks in the engine mount · Air Tractor AT-400, AT-400A, AT-402 and 9 more. Effective Jun 12, 2008
- [AD 2003-06-01](https://openairdocs.org/ad/2003-06-01) (historical): Wing centerline splice joint · Air Tractor AT-300, AT-301, AT-302 and 2 more. Effective Apr 4, 2003
- [AD 2002-25-09](https://openairdocs.org/ad/2002-25-09) (historical): Overturn skid plate · Air Tractor AT-250, AT-300, AT-301 and 10 more. Effective Feb 10, 2003
- [AD 2001-10-04 R1](https://openairdocs.org/ad/2001-10-04-R1) (historical): Wing Lower Spar Cap · Air Tractor AT-400, AT-400A, AT-401 and 11 more. Effective Jun 8, 2001
- [AD 96-23-19](https://openairdocs.org/ad/96-23-19) (historical): Flap Actuator Overtravel Stop · Air Tractor AT-300, AT-301, AT-302 and 13 more. Effective Dec 18, 1996

## Information bulletins (advisory) (5)

- [SAIB CE-16-27](https://openairdocs.org/saib/CE-16-27): Flight Controls, Trailing Edge (TE) Flap Control System. Issued Oct 31, 2016
- [SAIB CE-11-57](https://openairdocs.org/saib/CE-11-57): Powerplant, Engine Mount Section. Issued Sep 14, 2011
- [SAIB CE-11-41](https://openairdocs.org/saib/CE-11-41): Fuselage, Wing Attach Fittings. Issued Jun 29, 2011
- [SAIB CE-11-30](https://openairdocs.org/saib/CE-11-30): Aircraft Structures. Issued May 9, 2011
- [SAIB CE-04-23](https://openairdocs.org/saib/CE-04-23): . Issued Dec 2, 2003

## Registered aircraft (19)

- [N23416](https://openairdocs.org/aircraft/N23416): [Woodley Aerial Leasing LLC](https://openairdocs.org/faa-owner/WOODLEY%20AERIAL%20LEASING%20LLC), [Walnut, IL](https://openairdocs.org/faa-place/IL/Walnut), built 1981, S/N 301-0385
- [N2347P](https://openairdocs.org/aircraft/N2347P): [Dakota Air Spray LLC](https://openairdocs.org/faa-owner/DAKOTA%20AIR%20SPRAY%20LLC), [Huron, SD](https://openairdocs.org/faa-place/SD/Huron), built 1981, S/N 301-0388
- [N23813](https://openairdocs.org/aircraft/N23813): [Davis Blake A](https://openairdocs.org/faa-owner/DAVIS%20BLAKE%20A), [Bellevue, TX](https://openairdocs.org/faa-place/TX/Bellevue), built 1982, S/N 400A-0433
- [N2394N](https://openairdocs.org/aircraft/N2394N): [Associated Aerial Applicators Inc](https://openairdocs.org/faa-owner/ASSOCIATED%20AERIAL%20APPLICATORS%20INC), [La Salle, CO](https://openairdocs.org/faa-place/CO/La%20Salle), built 1982, S/N 400A-0446
- [N23951](https://openairdocs.org/aircraft/N23951): [Rowland Dusters LLC](https://openairdocs.org/faa-owner/ROWLAND%20DUSTERS%20LLC), [Raymondville, TX](https://openairdocs.org/faa-place/TX/Raymondville), S/N 400A-0447
- [N3157B](https://openairdocs.org/aircraft/N3157B): [Marlow Aviation LLC](https://openairdocs.org/faa-owner/MARLOW%20AVIATION%20LLC), [Lamoni, IA](https://openairdocs.org/faa-place/IA/Lamoni), S/N 400A-0449
- [N3160X](https://openairdocs.org/aircraft/N3160X): [Woodley Aerial Leasing LLC](https://openairdocs.org/faa-owner/WOODLEY%20AERIAL%20LEASING%20LLC), [Walnut, IL](https://openairdocs.org/faa-place/IL/Walnut), built 1983, S/N 301-0479
- [N331KE](https://openairdocs.org/aircraft/N331KE): [Crop Air LLC](https://openairdocs.org/faa-owner/CROP%20AIR%20LLC), [Eaton, CO](https://openairdocs.org/faa-place/CO/Eaton), built 1982, S/N 400A-0460
- [N3650D](https://openairdocs.org/aircraft/N3650D): [Woodley Aerial Leasing LLC](https://openairdocs.org/faa-owner/WOODLEY%20AERIAL%20LEASING%20LLC), [Walnut, IL](https://openairdocs.org/faa-place/IL/Walnut), built 1980, S/N 302-0240
- [N3655B](https://openairdocs.org/aircraft/N3655B): [Woodley Aerial Leasing LLC](https://openairdocs.org/faa-owner/WOODLEY%20AERIAL%20LEASING%20LLC), [Walnut, IL](https://openairdocs.org/faa-place/IL/Walnut), built 1980, S/N 301-0291
- [N3657T](https://openairdocs.org/aircraft/N3657T): [Central Planes Aviation Inc](https://openairdocs.org/faa-owner/CENTRAL%20PLANES%20AVIATION%20INC), [Sauk Centre, MN](https://openairdocs.org/faa-place/MN/Sauk%20Centre), built 1980, S/N 301-0316
- [N400DQ](https://openairdocs.org/aircraft/N400DQ): [Oregon Trail Air Service LLC](https://openairdocs.org/faa-owner/OREGON%20TRAIL%20AIR%20SERVICE%20LLC), [Nyssa, OR](https://openairdocs.org/faa-place/OR/Nyssa), S/N 301-0343
- [N4350J](https://openairdocs.org/aircraft/N4350J): [Phoenix Equipment Lc](https://openairdocs.org/faa-owner/PHOENIX%20EQUIPMENT%20LC), [Nickerson, KS](https://openairdocs.org/faa-place/KS/Nickerson), built 1982, S/N 400A-0463
- [N497GA](https://openairdocs.org/aircraft/N497GA): [Tri-State Aerial LLC](https://openairdocs.org/faa-owner/TRI-STATE%20AERIAL%20LLC), [Canton, SD](https://openairdocs.org/faa-place/SD/Canton), built 1984, S/N 400A-0502
- [N73006](https://openairdocs.org/aircraft/N73006): [Mid Continent Aircraft Corp](https://openairdocs.org/faa-owner/MID%20CONTINENT%20AIRCRAFT%20CORP), [Hayti, MO](https://openairdocs.org/faa-place/MO/Hayti), built 1985, S/N 400A-0501
- [N73085](https://openairdocs.org/aircraft/N73085): [Woodley Aerial Leasing LLC](https://openairdocs.org/faa-owner/WOODLEY%20AERIAL%20LEASING%20LLC), [Walnut, IL](https://openairdocs.org/faa-place/IL/Walnut), built 1985, S/N 301-0636
- [N73127](https://openairdocs.org/aircraft/N73127): [Georges Aircraft Repair](https://openairdocs.org/faa-owner/GEORGES%20AIRCRAFT%20REPAIR), [Vernon, TX](https://openairdocs.org/faa-place/TX/Vernon), built 1987, S/N 301-0667
- [N8791S](https://openairdocs.org/aircraft/N8791S): [Woodley Aerial Leasing LLC](https://openairdocs.org/faa-owner/WOODLEY%20AERIAL%20LEASING%20LLC), [Walnut, IL](https://openairdocs.org/faa-place/IL/Walnut), built 1979, S/N 301-0194
- [N8907S](https://openairdocs.org/aircraft/N8907S): [Woodley Aerial Leasing LLC](https://openairdocs.org/faa-owner/WOODLEY%20AERIAL%20LEASING%20LLC), [Walnut, IL](https://openairdocs.org/faa-place/IL/Walnut), built 1979, S/N 301-0230

## NTSB investigations (15)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB CEN25LA303](https://openairdocs.org/ntsb/CEN25LA303), Aug 3, 2025: Air Tractor AT-400A (N3157B), Lamoni, IA, substantial damage. Probable cause: The pilot’s failure to maintain airplane control during an aborted takeoff.
- [NTSB ERA22LA255](https://openairdocs.org/ntsb/ERA22LA255), Jun 1, 2022: Air Tractor AT-400A (N3658T), Pemberton Township, NJ, substantial damage. Probable cause: The pilot’s improper landing flare, which resulted in a hard, bounced landing and a subsequent loss of control.
- [NTSB GAA19CA163](https://openairdocs.org/ntsb/GAA19CA163), Mar 11, 2019: Air Tractor AT 400A (N400DQ), Parma, ID, substantial damage. Probable cause: The pilot's failure to maintain directional control during landing in variable wind conditions, which resulted in the right wing impacting muddy terrain.
- [NTSB CEN13LA239](https://openairdocs.org/ntsb/CEN13LA239), Apr 24, 2013: Air Tractor AT-301 (N23416), Bowling Green, MO, substantial damage. Probable cause: The failure of the engine supercharger's rear bearing, which resulted in the loss of engine power.
- [NTSB CHI08CA257](https://openairdocs.org/ntsb/CHI08CA257), Aug 16, 2008: Air Tractor AT-400A (N7307W), Luverne, MN, substantial damage. Probable cause: The failure of the compressor turbine blades which resulted in the loss of power. Factors associated with the accident were the low altitude and the trees.
- [NTSB CHI06CA254](https://openairdocs.org/ntsb/CHI06CA254), Aug 24, 2006: Air Tractor AT-400A (N73006), Alliance, NE, substantial damage. Probable cause: The pilot's inadequate preflight inspection which led to the aircraft tow bar not being removed prior to flight.
- [NTSB ATL02LA066](https://openairdocs.org/ntsb/ATL02LA066), Mar 26, 2002: Air Tractor AT-400A (N3159G), Hastings, FL, substantial damage. Probable cause: Fatigue cracking in the most outboard splice bolt hole in the lower spar cap of the right wing. .
- [NTSB FTW99LA031](https://openairdocs.org/ntsb/FTW99LA031), Nov 19, 1998: Air Tractor AT-400A (N23787), Bunkie, LA, substantial damage. Probable cause: The total loss of engine power for an undetermined reason. A factor was the lack of suitable terrain for the forced landing.
- [NTSB FTW97LA223](https://openairdocs.org/ntsb/FTW97LA223), Jun 13, 1997: Air Tractor AT-400A (N3161J), Black Oak, AR, destroyed. Probable cause: The loss of engine power due to compressor turbine blade failure. A factor was the lack of suitable terrain for the forced landing.
- [NTSB FTW97LA169](https://openairdocs.org/ntsb/FTW97LA169), Apr 19, 1997: Air Tractor AT-400 (N73127), Fluvanna, TX, substantial damage. Probable cause: The loss of engine power due to the failure of the reduction gear box. A factor was the lack of suitable terrain for the forced landing.
- [NTSB FTW91DRD04](https://openairdocs.org/ntsb/FTW91DRD04), May 10, 1991: Air Tractor AT 301 (N3658T), Lake Providence, LA, substantial damage. Probable cause: A LOSS OF ENGINE POWER FOR UNDETERMINED REASONS RESULTING IN A FORCED LANDING AND NOSE OVER ON LANDING.
- [NTSB FTW88DQG02](https://openairdocs.org/ntsb/FTW88DQG02), Oct 19, 1987: Air Tractor AT-301 (N73127), Lockney, TX, substantial damage
- [NTSB FTW86FQG09](https://openairdocs.org/ntsb/FTW86FQG09), Feb 19, 1986: Air Tractor AT-400A (N23592), Hereford, TX, substantial damage
- [NTSB FTW83FA270](https://openairdocs.org/ntsb/FTW83FA270), Jun 9, 1983: Air Tractor AT-400A (N31619), Lane City, TX, destroyed, 1 fatal
- [NTSB SEA79DYA27](https://openairdocs.org/ntsb/SEA79DYA27), Aug 10, 1979: Air Tractor AT-301 (N8791S), Newdale, ID, substantial damage

## FAA accident and incident reports (22)

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [Accident 20250803011269A](https://openairdocs.org/incident/20250803011269A), Aug 3, 2025: Air Tractor Inc AT-400A (N3157B), Lamoni, IA, Substantial damage. The pilot failed to maintain control of the aircraft during an aborted takeoff resulting in the aircraft entering a ditch beyond the end of the runway.
- [Accident 20220601005089A](https://openairdocs.org/incident/20220601005089A), Jun 1, 2022: Air Tractor Inc AT-400A (N3658T), Pemberton, NJ, Substantial damage. While landing at the agricultural operators main operating base the pilot landed hard, bounced twice, lost control and veered to the right and impacted a ditch.
- [Accident 20190311001189A](https://openairdocs.org/incident/20190311001189A), Mar 11, 2019: Air Tractor Inc AT-400A (N400DQ), Parma, ID, Substantial damage. The pilot had just completed a agricultural dispensing operation and was landing at his home base in Parma, ID. Winds at the time were 4 knots and variable.…
- [Accident 20130424012379A](https://openairdocs.org/incident/20130424012379A), Apr 24, 2013: Air Tractor Inc AT-301 (N23416), Bowling Green, MO, Substantial damage. Amendment to original report: On July 25, 2013 the NTSB received a teardown report from covington aircraft in okmulgee, OK. The supercharger unit was sent to…
- [Incident 20130420006809I](https://openairdocs.org/incident/20130420006809I), Apr 20, 2013: Air Tractor Inc AT-301 (N3658T), Pantego, NC, Minor damage. Upon landing at a private airstrip the pilot was unable to maintain directional control due to right crosswind. The airplane exited the right side of the…
- [Accident 20080816846649A](https://openairdocs.org/incident/20080816846649A), Aug 16, 2008: Airtrc AT400A (N7307W), Luverne, MN, Destroyed. (-23) The engine CT blades failed causing the aircraft to lose power and crash into a very wet pasture and then hit a large tree. The pilot attempted to land…
- [Accident 20060823017199A](https://openairdocs.org/incident/20060823017199A), Aug 23, 2006: Airtrc AT400A (N73006), Alliance, NE, Substantial damage. (-23) Prior to taxi and takeoff the pilot failed to remove the aircraft tow bar before takeoff causing substantial damage to the aircraft.
- [Incident 20060525008939I](https://openairdocs.org/incident/20060525008939I), May 25, 2006: Airtrc AT301 (N23416), Independence, KS, Minor damage. (-23) On may 25, 2006 at about 0945 an air-tractor 301, loaded with about 300 gallons of chemical experienced a power loss just after takeoff and about 200…
- [Accident 20020326009209A](https://openairdocs.org/incident/20020326009209A), Mar 26, 2002: Airtrc AT400A (N3159G), Hastings, FL, No damage. (-23) The pilot reported that while headed north at 125FT above the farm field and descending in preparation to spray he heard and felt a loud sharp explosion…
- [Accident 19981119047129A](https://openairdocs.org/incident/19981119047129A), Nov 19, 1998: Airtrc AT400A (N23787), Stlandry, LA, No damage. (-23) While on a spray pass at an altitude of approximately 20 feet, pilot felt engine losing power. Pilot banked aircraft right to avoid trees and powerlines…
- [Accident 19970613046779A](https://openairdocs.org/incident/19970613046779A), Jun 13, 1997: Airtrc AT400A (N3161J), Black Oak, AR, No damage. (-23) During aerial application operations the engine lost power and the pilot made an off strip landing in field. The engine is scheduled to be disassembled…
- [Accident 19970419007399A](https://openairdocs.org/incident/19970419007399A), Apr 19, 1997: Airtrc AT301 (N73127), Fluvanna, TX, Substantial damage. Rough engine power loss on a swath run. Tore off gear bent wing landing. Remote gear box failed. Broke shaft blades (-23) see attached sheet; no narrative…
- [Incident 19920507016089I](https://openairdocs.org/incident/19920507016089I), May 7, 1992: Airtrc AT301 (N8791S), Big Sandy, MT, Minor damage. Aircraft nosed over and came to rest inverted on landing rollout. Pilot had inadvertently locked brakes in flight.
- [Accident 19910510015479A](https://openairdocs.org/incident/19910510015479A), May 10, 1991: Airtrc AT301 (N3658T), Lake Providence, LA, Substantial damage. Crashed and flipped over during a spray run. Indications are fuel exhaustin. Pilot head injury caused amnesia.
- [Incident 19900605018509I](https://openairdocs.org/incident/19900605018509I), Jun 5, 1990: Airtrc AT301 (N3658T), Providence, LA, Minor damage. Engine lost power on climb. Dumped load. Force landing in field. Came to rest inverted. NR4 cylinder was cracked.
- [Incident 19890707037699I](https://openairdocs.org/incident/19890707037699I), Jul 7, 1989: Airtrc AT301 (N73127), Floydada, TX, Minor damage. Hit electrical power cable on spray run. Landed in corn field. Thought aircraft was above poles.
- [Incident 19880520041979I](https://openairdocs.org/incident/19880520041979I), May 20, 1988: Airtrc AT400A (N3159S), Earle, AR, Minor damage. Left main landing gear struck a levee on a spray run and collapsed when the airplane landed.
- [Accident 19871019060219A](https://openairdocs.org/incident/19871019060219A), Oct 19, 1987: Airtrc AT301 (N73127), Lockney, TX, Substantial damage. Crashed during an aerial application maneuver. Cause was a stall spin maneuver at a low altitude in a turn around.
- [Accident 19860219003389A](https://openairdocs.org/incident/19860219003389A), Feb 19, 1986: Airtrc AT400A (N23592), Hereford, TX, Substantial damage. Fuel was exhausted on return to airport from spray operation. Collided with rocky uphill terrain.
- [Incident 19840827051969I](https://openairdocs.org/incident/19840827051969I), Aug 27, 1984: Airtrc AT301 (N8907S), Jonesville, LA, Minor damage. Smoke from engine and power loss. Nosed over on forced landing. Newly overhauled engine had major intenal failure.
- [Accident 19830609024569A](https://openairdocs.org/incident/19830609024569A), Jun 9, 1983: Airtrc AT400A (N31619), Lane City, TX, Destroyed. Ag pilot pulled up at the end of spray run, stalled and spun aircraft into the ground.
- [Accident 19790810021439A](https://openairdocs.org/incident/19790810021439A), Aug 10, 1979: Airtrc AT301 (N8791S), Newdale, ID, Substantial damage. Attempted to takeoff with aircraft 1132 pounds over gross.

## Service difficulty reports (2)

As reported by operators and repair stations, by the model named in the report.

- [SDR EY2R9600933](https://openairdocs.org/sdr/EY2R9600933), Aug 1, 1996: BALL BEARING. CORRODED. BALL BEARING CORRODED.
- [SDR EY2R9600932](https://openairdocs.org/sdr/EY2R9600932), Aug 1, 1996: PILOT TUBE. CORRODED. CORROSION FOUND ON PILOT TUBES. REPLACED PILOT TUBES.

## STCs that may be installed (OpenAirDocs) (49)

Approved for this model: the STC's model list names it on its data sheet, or a series that includes it. In force first, then newest. The registry doesn't record which STCs an aircraft has.

- [STC SA04484CH](https://openairdocs.org/stc/SA04484CH): Installation of a Reabe Aircraft Improvement Power Gate Control System. Reabe Design LLC
- [STC SA01800SE](https://openairdocs.org/stc/SA01800SE): Fabrication and installation of new or replacement of existing instrument panel lights dimmer control. TCW Technologies, LLC
- [STC SA01861SE](https://openairdocs.org/stc/SA01861SE): Fabrication and installation of Landing Light Controller. TCW Technologies, LLC
- [STC SA12204WI](https://openairdocs.org/stc/SA12204WI): Wing Spar Cap manufacturing process change. Air Tractor Inc
- [STC SA03040CH](https://openairdocs.org/stc/SA03040CH): Installation of a digital payload hopper quantity and spray boom pressure indicating system. Reabe Design LLC
- [STC SA7965SW](https://openairdocs.org/stc/SA7965SW): Application of fabric and polyurethane finishing system. Shady Aviation LLC
- [STC SA01240SE](https://openairdocs.org/stc/SA01240SE): Installation of secondary voltage indication system. Visual Instruments LLC
- [STC SA04676CH](https://openairdocs.org/stc/SA04676CH): Installation of a True Quantity Gauge System. Reabe Design LLC
- [STC SA4503NM](https://openairdocs.org/stc/SA4503NM): Remove original cloth covering and install Ceconite covering. Ceconite Division of Poly-Fiber Inc
- [STC SA02266SE](https://openairdocs.org/stc/SA02266SE): Installation of a Lever Throttle Quadrant. Kawak Aviation Technologies Inc
- [STC SA04776NY](https://openairdocs.org/stc/SA04776NY): The HIPEC Covering and Finishing System must be performed and maintained. HIPEC Aircraft Coatings Inc
- [STC SA03819NY](https://openairdocs.org/stc/SA03819NY): Installation and maintenance of Oratex 6000 Covering and Coating System. Lanitz-Prena Folien Factory GmbH
- [STC SA00401BO](https://openairdocs.org/stc/SA00401BO): Installation of a SkyTrax100B UAT receiver. Avidyne Corporation
- [STC SA00888SE](https://openairdocs.org/stc/SA00888SE): Option 1: Install Walter M601-E11S engine and a Hartzell HC-B3TW-3/T10282N+4 propeller or a Walter M601-E11 engine and an Avia V508-E-AG 106/A propeller per the Master Drawing List and Installation Instructions given in Approved Model List SA00888SE. (Note: Prior to July 17, 2002, the model M601-E11S engine was designated as the model M601-E11 engine). Option 2: Install a Walter M601-D11 engine and Avia V508-E-AG 106/A propeller per Cascade Flying Service Master Drawing List CFS-MDL-0001 Rev G, dated June 15, 2004, and Cascade Flying Service Document CFS-IM-107, Rev A, dated July 29, 2003, “Installation Instructions for Walter Turbine Installation on Air Tractor 300 & 400 Series Ag Aircraft,” or later FAA-approved revisions to these documents. NOTE: The Air Tractor model AT-400, AT-402B, AT-502, AT-502B, and AT-503A airplanes are not eligible for modification under option 2. Cascade Flying Service LLC
- [STC SA02268CH](https://openairdocs.org/stc/SA02268CH): Installation of Airwolf Filter Corp. Air Oil Separator. Airwolf Filter Corporation
- [STC SA02135SE](https://openairdocs.org/stc/SA02135SE): Installation of Electronics International Inc. Glass Panel Engine Monitor (with In-Flight Data). Electronics International Inc
- [STC SA04165NY](https://openairdocs.org/stc/SA04165NY): Installation of Latitude Technologies Skynode S200 Satcom system must be performed. Latitude Technologies Corporation
- [STC SA01323CH](https://openairdocs.org/stc/SA01323CH): Installation of a ground single point fueling system. Turbine Conversions Ltd
- [STC SA00905SE](https://openairdocs.org/stc/SA00905SE): Install modified engine cowl. Cascade Flying Service LLC
- [STC SA02205SE](https://openairdocs.org/stc/SA02205SE): Installation of a replacement airframe fuel pump in accordance with Cascade Flying Service Master Drawing List FW-CFS545-90, Rev. B, dated October 19, 2011, or later FAA approved revision. Cascade Aircraft conversions LLC
- [STC SA01745WI](https://openairdocs.org/stc/SA01745WI): Installation of a Cable Cutter System on the Main Landing Gear. Hershey Flying Service Inc
- [STC SA00382BO](https://openairdocs.org/stc/SA00382BO): Installation of Globalstar Antenna and Cradle provisions to support a Globalstar GPS-1700 in non-composite airplanes. Avidyne Corporation
- [STC SA02276AK](https://openairdocs.org/stc/SA02276AK): Installation of AMSAFE Aviation Inflatable Restraints. AMSAFE Inc
- [STC SA00478CH](https://openairdocs.org/stc/SA00478CH): Installation of Cooper Superflite 102 Fabric. Aviation Products Systems Inc
- [STC SA00489LA](https://openairdocs.org/stc/SA00489LA): Installation of winglets. Aero Spraying Service Inc
- [STC ST03554CH](https://openairdocs.org/stc/ST03554CH): Installation of Rotary Gatekeeper and provisions equipment. Turbine Conversions Ltd
- [STC SA00403SE](https://openairdocs.org/stc/SA00403SE): Installation of Vortex Generators on the wings. Micro AeroDynamics Inc
- [STC SA03199CH](https://openairdocs.org/stc/SA03199CH): Install auto fill fuel system. Wilbur-Ellis LLC
- [STC SA02985CH](https://openairdocs.org/stc/SA02985CH): Installation of a Cool Start System in accordance with Installation Instructions , Revision A, dated April 14, 2011, or later FAA Approved revision. Turbine Conversions Ltd
- [STC SA4294SW](https://openairdocs.org/stc/SA4294SW): Installation of freon air conditioning unit (wind-driven compressor). Collins Aircraft Dynamics Inc
- [STC SA00068SE](https://openairdocs.org/stc/SA00068SE): Installation of fuel flow/pressure instruments. (W/TSIO-360-MB1). Electronics International Inc
- [STC SA02110CH](https://openairdocs.org/stc/SA02110CH): Installation of a Time Trac Data Recorder. P2 Incorporated
- [STC SA2693NM](https://openairdocs.org/stc/SA2693NM): Installation of Electronics International digital volt/amp gauges and accessories. Electronics International Inc
- [STC SA00171BO](https://openairdocs.org/stc/SA00171BO): Installation of Pratt & Whitney Engine Services, Inc. Aircraft Data Acquisition System ADAS+, P/N ADAS-K-010. Pratt & Whitney Engine Services Inc
- [STC SA2505NM](https://openairdocs.org/stc/SA2505NM): Installation of Pheromone aerial application system. (AT-400A RESTRICTED CATEGORY). Herculite Products Inc
- [STC SA04677CH](https://openairdocs.org/stc/SA04677CH): Installation of a Powered Hopper Lid and Auger System. Reabe Design LLC
- [STC SA01639NY](https://openairdocs.org/stc/SA01639NY): Replacement of 12 refrigerant in air conditioning system with Enviro Refrigerant Hotshot R414B. Scale Modelbuilders Inc
- [STC SA8075SW](https://openairdocs.org/stc/SA8075SW): Installation of fiberglass covering. (M-62 SERIES PT-19) (G-73 SCHWEIZER). Razorback Fabrics Inc
- [STC SA01258SE](https://openairdocs.org/stc/SA01258SE): Installation of the Automatic Flagman Dispenser Models in accordance with Automatic Flagman Master Drawing Lists specified in attached AML, or later FAA approved revision.This STC supercedes several existing STC s as listed in the notes on the attached AML. R-S Sales Inc
- [STC SA1110GL](https://openairdocs.org/stc/SA1110GL): Surrendered and incorporated into STC SA00478CH. AAR
- [STC SA01528CH](https://openairdocs.org/stc/SA01528CH): Installation of Walter M601E-11 model turbine engine and an AVIA Propeller Limited VJ8.510 or VJ8.510AG propeller system or Hartzell HC-B3TW-3/T10282NS+4 model propeller. Turbine Conversions Ltd
- [STC SA265NW](https://openairdocs.org/stc/SA265NW): Installation of Automatic Flagman Model No. 4 (Dispenser System) on the upper surface of the right wing root. R-S Sales Inc
- [STC SA00568WI](https://openairdocs.org/stc/SA00568WI): Installation of a Compro Aviation Driftfinder DFS-10 system which injects oil into engine exhaust to produce smoke that determines wind speed and direction. Compro Aviation Inc
- [STC SA00151SE](https://openairdocs.org/stc/SA00151SE): Fabrication and Installation of vortex generators and "delta wings" on the wings and a strake mounted above the left- and right-hand wing/fuselage junctions. Aeronautical Testing Service Inc
- [STC SA00648AT](https://openairdocs.org/stc/SA00648AT): Installation of chemical rinsing system. Paul S Woods
- [STC SA7469SW](https://openairdocs.org/stc/SA7469SW): Install freon air conditioning system with inverter and 117 VAC compressor. Collins Aircraft Dynamics Inc
- [STC SA3325SO](https://openairdocs.org/stc/SA3325SO): Installation of a chemical rinsing system. Paul S Woods
- [STC SA2853CE](https://openairdocs.org/stc/SA2853CE): Installation of Phoenix Aerospace DC voltage regulator. Phoenix Aerospace, Inc
- [STC SA4302NM](https://openairdocs.org/stc/SA4302NM): Installation of Electronics Int'l digital automatic engine analyzer. Electronics International

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