486 

14 CFR Ch. I (1–1–19 Edition) 

Pt. 27 

27.239

Spray characteristics. 

27.241

Ground resonance. 

M

ISCELLANEOUS

F

LIGHT

R

EQUIREMENTS

 

27.251

Vibration. 

Subpart C—Strength Requirements 

G

ENERAL

 

27.301

Loads. 

27.303

Factor of safety. 

27.305

Strength and deformation. 

27.307

Proof of structure. 

27.309

Design limitations. 

F

LIGHT

L

OADS

 

27.321

General. 

27.337

Limit maneuvering load factor. 

27.339

Resultant limit maneuvering loads. 

27.341

Gust loads. 

27.351

Yawing conditions. 

27.361

Engine torque. 

C

ONTROL

S

URFACE AND

S

YSTEM

L

OADS

 

27.391

General. 

27.395

Control system. 

27.397

Limit pilot forces and torques. 

27.399

Dual control system. 

27.411

Ground clearance: tail rotor guard. 

27.427

Unsymmetrical loads. 

G

ROUND

L

OADS

 

27.471

General. 

27.473

Ground loading conditions and as-

sumptions. 

27.475

Tires and shock absorbers. 

27.477

Landing gear arrangement. 

27.479

Level landing conditions. 

27.481

Tail-down landing conditions. 

27.483

One-wheel landing conditions. 

27.485

Lateral drift landing conditions. 

27.493

Braked roll conditions. 

27.497

Ground loading conditions: landing 

gear with tail wheels. 

27.501

Ground loading conditions: landing 

gear with skids. 

27.505

Ski landing conditions. 

W

ATER

L

OADS

 

27.521

Float landing conditions. 

M

AIN

C

OMPONENT

R

EQUIREMENTS

 

27.547

Main rotor structure. 

27.549

Fuselage, landing gear, and rotor 

pylon structures. 

E

MERGENCY

L

ANDING

C

ONDITIONS

 

27.561

General. 

27.562

Emergency landing dynamic condi-

tions. 

27.563

Structural ditching provisions. 

F

ATIGUE

E

VALUATION

 

27.571

Fatigue evaluation of flight struc-

ture. 

27.573

Damage tolerance and fatigue evalua-

tion of composite rotorcraft structures. 

Subpart D—Design and Construction 

G

ENERAL

 

27.601

Design. 

27.602

Critical parts. 

27.603

Materials. 

27.605

Fabrication methods. 

27.607

Fasteners. 

27.609

Protection of structure. 

27.610

Lightning and static electricity pro-

tection. 

27.611

Inspection provisions. 

27.613

Material strength properties and de-

sign values. 

27.619

Special factors. 

27.621

Casting factors. 

27.623

Bearing factors. 

27.625

Fitting factors. 

27.629

Flutter. 

R

OTORS

 

27.653

Pressure venting and drainage of 

rotor blades. 

27.659

Mass balance. 

27.661

Rotor blade clearance. 

27.663

Ground resonance prevention means. 

C

ONTROL

S

YSTEMS

 

27.671

General. 

27.672

Stability augmentation, automatic, 

and power-operated systems. 

27.673

Primary flight control. 

27.674

Interconnected controls. 

27.675

Stops. 

27.679

Control system locks. 

27.681

Limit load static tests. 

27.683

Operation tests. 

27.685

Control system details. 

27.687

Spring devices. 

27.691

Autorotation control mechanism. 

27.695

Power boost and power-operated con-

trol system. 

L

ANDING

G

EAR

 

27.723

Shock absorption tests. 

27.725

Limit drop test. 

27.727

Reserve energy absorption drop test. 

27.729

Retracting mechanism. 

27.731

Wheels. 

27.733

Tires. 

27.735

Brakes. 

27.737

Skis. 

F

LOATS AND

H

ULLS

 

27.751

Main float buoyancy. 

27.753

Main float design. 

27.755

Hulls. 

P

ERSONNEL AND

C

ARGO

A

CCOMMODATIONS

 

27.771

Pilot compartment. 

27.773

Pilot compartment view. 

27.775

Windshields and windows. 

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