CHAPTER 4

AIRFRAME

Section Title Page

4.000 Airframe . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.14.001 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.14.002 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.1

4.100 Fuselage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.14.110 Cabin Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.14.120 Windshield Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2

4.121 Windshield Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.24.122 Windshield Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.24.123 Windshield Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.3

4.130 Door Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.44.140 Fairing, Cowling and Inspection Panels . . . . . . . . . . . . . . . . . . . . . . . . . . 4.4

4.141 Side Skirts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.44.142 Mast Fairing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.64.143 Aft Cowling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.64.144 Cabin Inspection Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.6

4.200 Welded Steel Tube Frame Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.74.210 Left-Hand Frame Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.8

4.211 Left-Hand Frame Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.84.212 Left-Hand Frame Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.8

4.220 Right-Hand Frame Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.94.221 Right-Hand Frame Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.94.222 Right-Hand Frame Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.12

4.230 Upper Frame Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.134.231 Upper Frame Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.134.232 Upper Frame Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.14

4.240 Strut Assembly Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . 4.154.300 Tailcone And Empennage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.16

4.310 Tailcone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.164.311 Tailcone Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.164.312 Tailcone Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.164.313 Tailcone Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.174.314 Tailcone Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.22

4.320 Empennage Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.224.321 Empennage Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.22

OCT 2014 Chapter 4 Airframe Page 4.i

Page 4.ii Chapter 4 Airframe OCT 2014

CHAPTER 4

AIRFRAME (Continued)

Section Title Page

4.322 Empennage Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.234.323 Upper Stabilizer Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.234.324 Lower Stabilizer Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.234.325 Horizontal Stabilizer Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.24

CHAPTER 4

AIRFRAME

4.000 Airframe

4.001 Introduction

This section contains procedures for removal and installation of the cabin components, steel tube structures, tailcone and empennage.

4.002 Description

The R22 is a two-place, single main rotor, single engine helicopter constructed primarily of metal and equipped with skid-type landing gear.

The primary fuselage structure is welded steel tubing and riveted aluminum sheet. The tailcone is a monocoque structure in which aluminum skins carry primary loads. Fiberglass and thermoplastics are used in the secondary cabin structure, engine cooling shrouds, and various other ducts and fairings. The cabin doors are also constructed of fiberglass and thermoplastics.

A right-side cowl door provides access to the main gearbox and drive system. Additional access to controls and other components for maintenance is provided by removable panels and cowlings.

Stainless steel firewalls are located forward of and above the engine.

Both cabin doors may be removed and installed by maintenance personnel or pilots. To remove a door, remove cotter pins in upper and lower hinges, then open and lift door off. To install doors, use reverse procedure. Adjust weight and balance as required when removing and installing doors.

4.100 Fuselage

4.110 Cabin Assembly

The cabin assembly is a non-field replaceable assembly.

OCT 2014 Chapter 4 Airframe Page 4.1

Page 4.2 Chapter 4 Airframe OCT 2014

4.120 Windshield Assembly

The windshield is made of transparent plexiglass set in a weather-tight silicone sealer and is screwed to the cabin structure.

4.121 Windshield Removal

a. Remove door and hinges.

NOTE

To prevent scratches in the windshield, a protective cover should be taped to the inside and outside of the windshield prior to removal.

b. Remove screws and side retainer holding windshield.

c. Reinstall hinges and doors for cabin structure support with window removed.

d. Remove screws and retainers (upper, lower and middle) holding windshield.

e. Clean silicone sealant off retainers.

f. Clean silicone sealant off windshield for re-installation.

4.122 Windshield Installation

a. Remove all old sealant on cabin, retainers and windshield.

b. Tape edge of windshield with 3/4 polyvinyl chloride tape.

c. Install windshield and cleco retainer strips.

d. Mask windshield along edge of retainer strips with 1/2 masking tape. This will catch silicone gel squeeze-out on installation of retainer strips.

e. Remove the retainer strips.

f. To ensure a proper seal, run a bead of B270-13 silicone gel along entire edge of tape line.

g. Holding windshield in place, cleco retainer strips (center, upper and lower) onto windshield.

Chapter 4 - Airframe4.000 Airframe4.001 Introduction4.002 Description

4.100 Fuselage4.110 Cabin Assembly4.120 Windshield Assembly4.121 Windshield Removal4.122 Windshield Installation4.123 Windshield Replacement

4.130 Door Removal and Installation4.140 Fairing, Cowling and Inspection Panels4.141 Side Skirts4.142 Mast Fairing4.143 Aft Cowling 4.144 Cabin Inspection Panels

4.200 Welded Steel Tube Frame Assemblies4.210 Left-Hand Frame Assembly4.211 Left-Hand Frame Removal 4.212 Left-Hand Frame Installation

4.220 Right-Hand Frame Assembly4.221 Right-Hand Frame Removal 4.222 Right-Hand Frame Installation

4.230 Upper Frame Assembly4.231 Upper Frame Removal4.232 Upper Frame Installation

4.240 Strut Assembly Removal and Installation

4.300 Tailcone and Empennage4.310 Tailcone4.311 Tailcone Removal4.312 Tailcone Installation4.313 Tailcone Replacement4.314 Tailcone Repair

4.320 Empennage Assembly4.321 Empennage Removal4.322 Empennage Installation4.323 Upper Stabilizer Replacement4.324 Lower Stabilizer Replacement4.325 Horizontal Stabilizer Replacement