AIR TRACTOR AT-402A - User Manual

AIR TRACTOR, INC.
Olney, Texas
AT-402A/402B
TABLE OF CONTENTS
DESCRIPTION SECTION
Page No.
GENERAL ................................................................................................................. 1
CERTIFICATION BASIS ............................................................................................... 1
INSTRUCTIONS FOR CONTINUED AIRWORTHINESS (ICA’s) .................................. 1
FUSELAGE ................................................................................................................. 2
WINGS ................................................................................................................. 2
AILERONS ................................................................................................................. 3
Bendable Aileron Trim Tabs ................................................................................. 3
FLAPS ................................................................................................................. 3
EMPENNAGE .............................................................................................................. 4
LANDING GEAR AND BRAKES ................................................................................... 4
Landing Gear ....................................................................................................... 4
Brake System ...................................................................................................... 4
BRAKE SYSTEM SCHEMATIC .................................................................................... 5
ENGINE ................................................................................................................. 6
INDUCTION SYSTEM .................................................................................................. 6
EXHAUST SYSTEM ..................................................................................................... 6
FUEL SYSTEM............................................................................................................. 6
FUEL SYSTEM SCHEMATIC ....................................................................................... 8
TO INSTALL FERRY FUEL SYSTEM .......................................................................... 9
TO REMOVE FERRY FUEL SYSTEM ......................................................................... 9

Summary

General Aircraft Description

Aircraft Overview

Overview of the Air Tractor AT-402B agricultural aircraft, its engine, and capabilities.

Certification Basis

Structural and engine certification requirements according to FAR 23.

Continued Airworthiness Instructions

Maintenance guidance and list of required manuals for continued airworthiness.

Airframe Structure

Fuselage Construction

Details on the heli-arc welded 4130N steel tubing structure and skin assembly.

Wing Design and Materials

Description of the full cantilever wing structure, materials, and dimensions.

Control Surfaces

Aileron Trim Tabs

Small adjustable tabs on aileron trailing edges for roll trim adjustment.

Flaps Operation

Information on the extra large Fowler-type flaps and their operation.

Empennage and Landing Systems

Empennage Structure

Details on horizontal stabilizers, vertical fin, and control surface hinges.

Landing Gear

Description of the spring type main and tail landing gear and wheel specifications.

Brake System

Details on Cleveland brakes, cylinders, and fluid reservoir.

Engine and Fuel Systems

Engine Specifications

Specifications for the Pratt & Whitney PT6A-15AG and PT6A-11AG turboprop engines.

Induction System

Explanation of the engine air intake, filter systems, and pressure differential warning.

Exhaust System

Information on exhaust pipes, attachment hardware, and covers.

Fuel System Overview

Details on standard and optional fuel tanks, header tank, and fuel valve.

Fuel System Details

Information on fuel filter types, airframe pump, fuel lines, and drains.

Fuel System Procedures

Install Ferry Fuel System

Step-by-step procedure for installing the optional ferry fuel system.

Remove Ferry Fuel System

Step-by-step procedure for removing the optional ferry fuel system.

Engine Controls and Propeller

Engine Controls

Description of the cockpit power, propeller, and start control levers.

Propeller and Governor

Details on the Hartzell propeller and Woodward overspeed governor.

Starting and Charging System

System Components

Components of the starter/generator, GCU, relays, and switches.

Theory of Operation

Explanation of starting, generator mode, and protective circuits.

Electrical System and Cockpit

Electrical System Details

Details on the starter-generator, circuit breaker, voltage regulator, and batteries.

Cockpit Description

Information on visibility, entry, seat adjustment, and restraint systems.

Cockpit Systems

Control System

Description of push-pull tubes, rod-end bearings, and control stops.

Engine-Driven Air Conditioner

Description of the gas-cycle air conditioning system and its components.

Dispersal System

Dispersal System Components

Details on spray nozzles, booms, pump, and fan brake lever.

Payload Quantity Indication

System for indicating hopper quantity and spray boom pressure.

Hopper and Heater Systems

Hopper Rinse System

Description of the hopper rinse tank and pump system.

Cockpit Heater

Details on the optional cockpit heater system and its operation.

AIR TRACTOR AT-402A Specifications

General

Manufacturer	Air Tractor
Model	AT-402A
Type	Agricultural Aircraft
Engine	Pratt & Whitney Canada PT6A-15AG
Wingspan	15.24 m (50 ft)
Height	15, 000 ft
Fuel Capacity	757 liters (200 US gal)
Hopper Capacity	400 US gal (1, 514 l)
Cruise Speed	241 km/h (150 mph)
Range	805 km (500 mi)
Service Ceiling	4, 572 m (15, 000 ft)
Rate of Climb	800 ft/min (4.1 m/s)