# N166MM: 1999 Air Tractor AT-502A

- Status: Valid registration
- Airframe: [Air Tractor AT-502A](https://openairdocs.org/model/air-tractor-at-502a) (registry code 0390306, 1 seats)
- Engine: [Pratt & Whitney Canada PT6A-65B](https://openairdocs.org/engine/pratt-whitney-canada-pt6a-65b) (registry code 52115)
- Data sheets: [TCDS A17SW](https://openairdocs.org/tcds/A17SW) (Air Tractor Inc.), [TCDS E4EA](https://openairdocs.org/tcds/E4EA) (Pratt & Whitney Canada Corp.) (OpenAirDocs)
- Serial number: 502A-0572
- Year built: 1999
- Type: Fixed wing single engine
- Engine type: Turbo-prop
- Airworthiness: Restricted, forest
- Airworthiness date: April 21, 1999
- Certificate issued: September 22, 2023
- Expires: September 30, 2030
- Mode S code: A10917
- Registered owner: [Crider Flying Service Inc](https://openairdocs.org/faa-owner/CRIDER%20FLYING%20SERVICE%20INC)
- Location: [Swifton, AR](https://openairdocs.org/faa-place/AR/Swifton)
- Owner type: Corporation
- Owner's area on the map: 35.5809° N, 91.2297° W: Placed by OpenAirDocs at the center of ZIP code 72112, within about 10 miles (OpenAirDocs). The owner's mailing address, not where the aircraft is based
- FAA registry: https://registry.faa.gov/AircraftInquiry/Search/NNumberResult?nNumberTxt=166MM
- Page: https://openairdocs.org/aircraft/N166MM

From the FAA registry file of October 22, 2026. ADs below are matched by the registry's airframe and engine model codes. They may apply; each AD's applicability can narrow it by serial number, part number or installed equipment. This is not a compliance determination.

## ADs that may apply (OpenAirDocs): 9 in force

### Matched by airframe (Air Tractor AT-502A)

- [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 2006-24-10](https://openairdocs.org/ad/2006-24-10): Wing spar lower cap · Winglets (Aero Spraying Service STC SA00490LA). Effective Jan 8, 2007
- [AD 2006-23-14](https://openairdocs.org/ad/2006-23-14): Rudder and vertical fin hinge attaching structure · Air Tractor AT-502, AT-502A, AT-502B and 3 more. Effective Dec 21, 2006
- [AD 2004-15-15](https://openairdocs.org/ad/2004-15-15): Aft Fuselage Upper Longeron · Air Tractor AT-401, AT-401B, AT-402 and 10 more. Effective Sep 7, 2004
- [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

### Matched by engine (Pratt & Whitney Canada PT6A-65B)

- [AD 2004-25-18](https://openairdocs.org/ad/2004-25-18): Propeller governor assemblies · Pratt & Whitney Canada PT6A-60A and PT6A-65B. Effective Jan 18, 2005
- [AD 97-04-12](https://openairdocs.org/ad/97-04-12): Compressor Bleed-off Valve · Pratt & Whitney Canada PT6A-11, PT6A-110, PT6A-112 and 52 more. Effective Mar 14, 1997

### 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 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 2002-26-05](https://openairdocs.org/ad/2002-26-05) (historical): Wing Lower Spar Cap · Winglets (Aero Spraying Service STC SA00490LA). Effective Jan 15, 2003
- [AD 2002-11-03](https://openairdocs.org/ad/2002-11-03) (historical): Wing Lower Spar Cap · Winglets (Aero Spraying Service STC SA00490LA). Effective Jun 14, 2002
- [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 2001-10-04](https://openairdocs.org/ad/2001-10-04) (historical): Wing Lower Spar Cap · Air Tractor AT-400, AT-401, AT-401B and 10 more. Effective Jun 8, 2001
- [AD 2000-14-51](https://openairdocs.org/ad/2000-14-51) (historical): Wing Lower Spar Cap · Air Tractor AT-501, AT-502 and AT-502A. Effective Aug 4, 2000
- [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) (8 in force)

- [SAIB CE-18-06](https://openairdocs.org/saib/CE-18-06): Flight Controls, Rudder Control System. Issued Dec 1, 2017
- [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-16-10](https://openairdocs.org/saib/CE-16-10): Stabilizers, Rudder Structure. Issued Dec 1, 2015
- [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-05-28](https://openairdocs.org/saib/CE-05-28): . Issued Jan 21, 2005
- [SAIB NE-15-21](https://openairdocs.org/saib/NE-15-21): Fuel Injector Nozzle. Issued Aug 19, 2015
- [SAIB CE-03-24](https://openairdocs.org/saib/CE-03-24): . Issued Feb 19, 2003

## NTSB investigations (1)

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 FTW99LA137](https://openairdocs.org/ntsb/FTW99LA137), May 11, 1999: Air Tractor AT-502A (N166MM), Huffman, TX, substantial damage. Probable cause: The pilot's inadequate compensation for the wind conditions during landing. Factors were the wind gusts and the high vegetation beside the runway.

## FAA accident and incident reports (2)

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.

- [Incident 20061003020549I](https://openairdocs.org/incident/20061003020549I), Oct 3, 2006: Airtrc AT502A (N166MM), Abernathy, TX. (-23) On October 3, 2006 at approximately 1830 CDT, the pilot of N166MM, a model 502A air tractor aircraft, noticed the accumulation of oil deposits on the…
- [Accident 19990511020549A](https://openairdocs.org/incident/19990511020549A), May 11, 1999: Airtrc AT502A (N166MM), Huffman, TX, Substantial damage. On may 11, 1999, at 1315 central daylight time, an air tractor AT-502A agricultural airplane, N166MM, was substantially damaged while landing at the South…

## Service difficulty reports

None filed for this aircraft. Matched to this aircraft by N-number and event date, checked against the reported serial number, make and model.

## STCs that may be installed (OpenAirDocs) (58, first 50)

Approved for this aircraft's airframe or engine model, in force first, then newest. The registry doesn't record which STCs an aircraft has; its records do.

### Approved for the airframe (Air Tractor AT-502A)

- [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 SA04837NY](https://openairdocs.org/stc/SA04837NY): Installation of AeroLED's Holdings, LLC., position lights, navigation lights, strobe lights and beacon lights. AeroLED's Holdings, LLC
- [STC SA02019SE-D](https://openairdocs.org/stc/SA02019SE-D): Installation of Garmin Model GTN 625/635/650; 725/750 Navigation System. Garmin International Inc
- [STC SA09719AC](https://openairdocs.org/stc/SA09719AC): Installation electrostatic spray equipment and controls. Zee Systems Inc
- [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 SA12083IB](https://openairdocs.org/stc/SA12083IB): Installation of the Avia Propeller Ltd. model V508H/108/A propeller. MT-Propeller Entwicklung GmbH
- [STC SA02738CH](https://openairdocs.org/stc/SA02738CH): Installation of L-3 Communications Avionics Systems. Acron Aviation Inc
- [STC SA04046CH PAGE 1](https://openairdocs.org/stc/SA04046CH%20PAGE%201): Installation of L-3 GENESIS (TM) Electronic Standby Instrument System (ESI-500/MAG-500). Acron Aviation Inc
- [STC SA01995WI](https://openairdocs.org/stc/SA01995WI): Spray System Installation. See attached FAA Approved Model List (AML) SA01995WI for required data. Aeronautix, LLC
- [STC SA04676CH](https://openairdocs.org/stc/SA04676CH): Installation of a True Quantity Gauge System. Reabe Design LLC
- [STC SA02658SE](https://openairdocs.org/stc/SA02658SE): Installation of Garmin GI 275 Multi-Function Display System. Garmin International Inc
- [STC SA01851WI](https://openairdocs.org/stc/SA01851WI): Installation of a Hydraulic Actuator and Auger. Texas Transland LLC
- [STC SA02266SE](https://openairdocs.org/stc/SA02266SE): Installation of a Lever Throttle Quadrant. Kawak Aviation Technologies Inc
- [STC SA01801SE](https://openairdocs.org/stc/SA01801SE): Installation of a Kawak Aviation Technologies auxiliary system, and optional ancillary equipment. Air Repair Inc
- [STC SA02444AK](https://openairdocs.org/stc/SA02444AK): Approval of the L-3 Communications NGT 9000/9000R ADS-B system installed. ADS-B Technologies LLC
- [STC SA01714WI](https://openairdocs.org/stc/SA01714WI): Installation of a Garmin transponders: (a) GTX 330/330D/33/33D with ADS-B Out functionality; (b) GTX 335/335R/345/345R with ADS-B Out and In functionality; or (c) GTX 335R/345R with ADS-B Out functionality in select airplanes installed with G950/G1000 systems. Garmin International Inc
- [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 SA04145NY](https://openairdocs.org/stc/SA04145NY): Installation of the Flight Data Acquisition Storage and Transmission System (Fast). Amtech Aeronautical Limited
- [STC SA01560SE](https://openairdocs.org/stc/SA01560SE): Install modified engine cowl per Cascade Flying Service LLC data. Cascade Flying Service LLC
- [STC SA01745WI](https://openairdocs.org/stc/SA01745WI): Installation of a Cable Cutter System on the Main Landing Gear. Hershey Flying Service Inc
- [STC SA01845WI](https://openairdocs.org/stc/SA01845WI): Installation of a Center Windshield. Hershey Flying Services
- [STC SA09873AC](https://openairdocs.org/stc/SA09873AC): Installation of Night Vision Goggle (NVG) compatible lighting system in Air Tractor, Inc. REB Technologies 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 SA02119SE PAGE 1](https://openairdocs.org/stc/SA02119SE%20PAGE%201): Installation of Garmin GDL 88 ADS-B UAT Transceiver System. Garmin International Inc
- [STC SA02442AK PAGE 1](https://openairdocs.org/stc/SA02442AK%20PAGE%201): Approval of the L-3 Communications NGT 2000/2500 ADS-B system. ADS-B Technologies, LLC
- [STC SA00490LA](https://openairdocs.org/stc/SA00490LA): Installation of winglets. Aero Spraying Service Inc
- [STC SA01669CH](https://openairdocs.org/stc/SA01669CH): Installation of Challenger Reusable Air Filter. Challenger Aviation Products Inc
- [STC ST03554CH](https://openairdocs.org/stc/ST03554CH): Installation of Rotary Gatekeeper and provisions equipment. Turbine Conversions Ltd
- [STC SA03266CH](https://openairdocs.org/stc/SA03266CH): Installation of Reabe Aircraft Improvement modified ram air inlet system 7-1-0-000. Reabe Aircraft Improvement Inc
- [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 SA8121SW](https://openairdocs.org/stc/SA8121SW): Installation of freon air conditioner. ZEE Systems Inc
- [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 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 SA4005NM](https://openairdocs.org/stc/SA4005NM): Precise Flight Inc. Pulselite Control System. Precise Flight Inc
- [STC SA00961CH](https://openairdocs.org/stc/SA00961CH): Installation of hydraulically driven material dispersal gate for fire fighting applications. Turbine Conversions Ltd
- [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 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 SA00569WI](https://openairdocs.org/stc/SA00569WI): 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 SA7469SW](https://openairdocs.org/stc/SA7469SW): Install freon air conditioning system with inverter and 117 VAC compressor. Collins Aircraft Dynamics Inc
- [STC SA00144AT](https://openairdocs.org/stc/SA00144AT): Installation of a WAG freon air conditioning system. WAG Corporation

All 58: https://openairdocs.org/aircraft/N166MM/stcs.md

## Related

- Other Air Tractor AT-502A aircraft: https://openairdocs.org/model/air-tractor-at-502a/aircraft.md
- The Pratt & Whitney Canada PT6A-65B engine: https://openairdocs.org/engine/pratt-whitney-canada-pt6a-65b.md

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