Table of Contents
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GENERAL .............................................................................................................................. 1
CERTIFICATION BASIS ........................................................................................................ 1
INSTRUCTIONS FOR CONTINUED AIRWORTHINESS (ICA's) ......................................... 2
FUSELAGE ............................................................................................................................ 3
WINGS .................................................................................................................................. 3
AILERONS ............................................................................................................................. 3
Bendable Aileron Trim Tabs ..................................................................................... 4
FLAPS .................................................................................................................................. 4
EMPENNAGE ........................................................................................................................ 4
LANDING GEAR AND BRAKES ............................................................................................ 5
Landing Gear ............................................................................................................ 5
Brake System ............................................................................................................ 5
Brake System Schematic .......................................................................................... 6
ENGINE ................................................................................................................................. 7
INDUCTION SYSTEM ........................................................................................................... 7
EXHAUST SYSTEM .............................................................................................................. 8
FUEL SYSTEM ..................................................................................................................... 8
Fuel System Schematic ............................................................................................ 9
To Install Ferry Fuel System ................................................................................... 10
To Remove Ferry Fuel System ............................................................................... 11
AIR TRACTOR, INC.
Olney, Texas
AT-502A/502B/504
TABLE OF CONTENTS
DESCRIPTION SECTION
Page No.
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Summary of Contents for AIR TRACTOR AT-502A
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Page 1: Table Of Contents
AIR TRACTOR, INC. Olney, Texas AT-502A/502B/504 TABLE OF CONTENTS DESCRIPTION SECTION Page No. GENERAL ..........................1 CERTIFICATION BASIS ......................1 INSTRUCTIONS FOR CONTINUED AIRWORTHINESS (ICA’s) ......... 2 FUSELAGE ..........................3 WINGS ..........................3 AILERONS ..........................3 Bendable Aileron Trim Tabs ..................4 FLAPS .......................... - Page 2 AIR TRACTOR, INC. Olney, Texas AT-502A/502B/504 TABLE OF CONTENTS (Continued) DESCRIPTION SECTION Page No. ENGINE CONTROLS ......................11 PROPELLER AND GOVERNOR ..................12 ELECTRONIC STARTING AND CHARGING SYSTEM ............13 Description ........................13 Theory of Operation ..................... 13 ELECTRICAL SYSTEM ....................... 14 COCKPIT ..........................
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Page 3: General
High-lift flaps are incorporated and are interconnected with the ailerons to provide extremely short take-off and landing distances. The AT-502A and AT-502B aircraft are single cockpit aircraft with a single seat. The AT-504 is two- place with side by side seating and has dual controls for training. -
Page 4: Instructions For Continued Airworthiness (Ica's)
AT-502A/502B/504 INSTRUCTIONS FOR CONTINUED AIRWORTHINESS (ICA’s) Maintain the airplane in accordance with the following manuals and documents: LIST OF MANUALS AND DOCUMENTS “Owner’s Manual- Air Tractor Model AT-502 Agricultural Airplane” Document #03-0110 Air Tractor Inc. Municipal Airport P.O. Box 485 Olney, Texas 76374 U.S.A. -
Page 5: Fuselage
Air Tractor, Inc. Description Page 3 AT-502A/502B/504 March 14, 2018 FUSELAGE The fuselage structure is of heli-arc welded 4130N steel tubing. All fittings and bushings are also of 4130N steel. Fuselage repairs may be made in accordance with appropriate FAA repair procedures and gas welding is permissible. -
Page 6: Bendable Aileron Trim Tabs
The elevator trim tabs act as Servo tabs in addition to providing longitudinal trim for the Air Tractor. Because of the large tab size, the trim tabs provide a considerable amount of trim authority. Removable bronze bushings are provided at each joint. -
Page 7: Landing Gear And Brakes
LANDING GEAR AND BRAKES Landing Gear A spring type main and tail landing gear is used on the Air Tractor. This type of landing gear provides a minimum of maintenance, low drag and considerable energy absorption for hard landings. In addition, a smooth ride is provided for operations from rough strips. -
Page 8: Brake System Schematic
Description Page 6 Air Tractor, Inc. March 14, 2018 AT-502A/502B/504... -
Page 9: Engine
The set point is 13 inches of water vacuum for AT-502B/504 aircraft and AT-502A aircraft with the PT6A-140AG engine. -
Page 10: Exhaust System
From the firewall, a fuel line is connected to a large fuel filter. This fuel filter may be either a Fram FS1133-PLM or Air Tractor p/n 53114-1 fuel filter (AT-502A model aircraft use a 53114-2 fuel filter). -
Page 11: Fuel System Schematic
Air Tractor, Inc. Description Page 9 AT-502A/502B/504 March 14, 2018... -
Page 12: To Install Ferry Fuel System
Description Page 10 Air Tractor, Inc. March 14, 2018 AT-502A/502B/504 The fuel filter screen is removed by removing the center bolt on top of the firewall-mounted filter unit. The steel filter bowl and screen can then be dropped off. The fuel in the bowl should be examined for sediment or water and the filter screen cleaned or replaced if necessary. -
Page 13: To Remove Ferry Fuel System
66-3635-2089 cable for the Power and Start controls, and p/n 66-3635-2196 for the Prop control. The AT-504 cable assembly is P/N 66-3635-2089 for the power, start, and propeller controls. The AT-502A with the PT6A-140AG engine uses the Orscheln p/n 38004804 cable for Power and Start controls and the... -
Page 14: Propeller And Governor
(reverse), 16.5° (low pitch), and 79.0° (feather) at the 42" station. The prop on the AT-502A with the PT6A-140AG engine is a Hartzell HC-B4TN-3C/T10702NS 4-blade 108.0 inches in diameter. The pitch settings of this propeller are -15.0° (reverse), 8.2° (low pitch) and 80.7°... -
Page 15: Electronic Starting And Charging System
Air Tractor, Inc. Description Page 13 AT-502A/502B/504 March 14, 2018 the procedure for checking the overspeed For the AT 502A with the PT6A-140AG engine (502XP) governor is as follows: POWER LEVER ....................IDLE PROP LEVER (P) ............Full forward for 1900 RPM PROP OVERSPEED TEST SWITCH .............. -
Page 16: Electrical System
Amp-hour rating of the two batteries combined is 42 amp- hours. The batteries are each 24 volt lead-acid batteries. The AT-502A has three G-246AT batteries when the PT6A-45R/-60AG/-65AG engines are installed and two G-246AT batteries when the PT6A-140AG engine is installed. -
Page 17: Cockpit
A special installation tool is required for installing new covers and may be borrowed from the local Air Tractor dealer. At the bottom extreme of the seat a tube structure supports a thick Ensonite pad to protect the pilot should the covering material fail in a severe crash. -
Page 18: Control System
Gears in the engine pad drive a splined quill shaft that turns a small two-sheave pulley. This small pulley drives the larger flywheel pulley with a flat serpentine belt. The belt is Goodyear p/n 4080220 and is specially made for Air Tractor. This larger drive pulley is connected, through an electromagnetic clutch, to the compressor shaft. -
Page 19: Dispersal System
The spray pump is an Agrinautics p/n 65219 two-inch capacity pump. The fan is a Micronair five blade adjustable pitch fan. The control valve is a Transland p/n 20384 and the strainer is an Air Tractor p/n 80392-12. The bottom-load valve is a Transland two and a half inch p/n 22395. -
Page 20: Digital Payload Hopper Quantity Indication System
Description Page 18 Air Tractor, Inc. March 14, 2018 AT-502A/502B/504 The hopper vent tube is welded 3" diameter stainless tubing inside the hopper. A 3" stainless ball is used to seal off the overboard vent when the liquid level reaches the top of the hopper. The vent tube protruding from the lower fuselage skin is made of aluminum and can be rotated to point forward to provide positive pressure in the hopper for dry material application. -
Page 21: Hopper Rinse System
The valve is opened by pulling up on the knob on the left side of the seat above the floor (AT-502A/502B) or the center-mounted floor console (AT- 504). - Page 22 This Page Intentionally Left Blank...
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