DRS

Dek Regulatory System

Welcome to the World of Certification!

CS-27: Certification Specifications for Small Rotorcraft

EASA · 265 provisions · 11 revisions · current CS27-10 (8 Feb 2023)

Revisions (11)
RevisionEffective
CS27-014 Nov 2003
CS27-130 Nov 2007
CS27-217 Nov 2008
CS27-318 Dec 2012
CS27-42 Dec 2016
CS27-526 Jun 2018
CS27-618 Dec 2018
CS27-72 Jul 2020
CS27-817 Jun 2021
CS27-918 Dec 2021
CS27-108 Feb 2023
Subpart A — General 3 sections
SectionTitleVersionsFirst / latest
§27.1Applicability2CS27-0 / CS27-4
§27.2Special Retroactive Requirements3CS27-0 / CS27-10
CS-27 C27Criteria for Category A7CS27-0 / CS27-10
Subpart B — Flight 29 sections
SectionTitleVersionsFirst / latest
§27.21Proof of compliance1CS27-0 / CS27-0
§27.25Weight limits3CS27-0 / CS27-10
§27.27Centre of gravity limits1CS27-0 / CS27-0
§27.29Empty weight and corresponding centre of gravity1CS27-0 / CS27-0
§27.31Removable ballast1CS27-0 / CS27-0
§27.33Main rotor speed and pitch limits1CS27-0 / CS27-0
§27.45General1CS27-0 / CS27-0
§27.49Performance at minimum operating speed1CS27-1 / CS27-1
§27.51Take-off2CS27-0 / CS27-1
§27.65Climb: all-engines-operating1CS27-0 / CS27-0
§27.67Climb: one-engine-inoperative1CS27-0 / CS27-0
§27.71Glide performance1CS27-0 / CS27-0
§27.73Performance at minimum operating speed2CS27-0 / CS27-1 ✕ Deleted
§27.75Landing2CS27-0 / CS27-1
§27.79Limiting height-speed envelope2CS27-0 / CS27-1
§27.141General1CS27-0 / CS27-0
§27.143Controllability and manoeuvrability2CS27-0 / CS27-1
§27.151Flight controls1CS27-0 / CS27-0
§27.161Trim control1CS27-0 / CS27-0
§27.171Stability: general1CS27-0 / CS27-0
§27.173Static longitudinal stability2CS27-0 / CS27-1
§27.175Demonstration of static longitudinal stability2CS27-0 / CS27-1
§27.177Static directional stability3CS27-0 / CS27-10
§27.231General1CS27-0 / CS27-0
§27.235Taxying condition1CS27-0 / CS27-0
§27.239Spray characteristics1CS27-0 / CS27-0
§27.241Ground resonance1CS27-0 / CS27-0
§27.251Vibration1CS27-0 / CS27-0
CS-27 B27Airworthiness Criteria for Helicopter Instrument Flight3CS27-0 / CS27-10
Subpart C — Strength Requirements 36 sections
SectionTitleVersionsFirst / latest
§27.301Loads1CS27-0 / CS27-0
§27.303Factor of safety1CS27-0 / CS27-0
§27.305Strength and deformation1CS27-0 / CS27-0
§27.307Proof of structure1CS27-0 / CS27-0
§27.309Design limitations2CS27-0 / CS27-10
§27.321General1CS27-0 / CS27-0
§27.337Limit manoeuvring load factor1CS27-0 / CS27-0
§27.339Resultant limit manoeuvring loads1CS27-0 / CS27-0
§27.341Gust loads1CS27-0 / CS27-0
§27.351Yawing conditions1CS27-0 / CS27-0
§27.361Engine torque1CS27-0 / CS27-0
§27.391General1CS27-0 / CS27-0
§27.395Control system1CS27-0 / CS27-0
§27.397Limit pilot forces and torques2CS27-0 / CS27-10
§27.399Dual control system1CS27-0 / CS27-0
§27.411Ground clearance: tail rotor guard1CS27-0 / CS27-0
§27.427Unsymmetrical loads1CS27-0 / CS27-0
§27.471General1CS27-0 / CS27-0
§27.473Ground loading conditions and assumptions1CS27-0 / CS27-0
§27.475Tyres and shock absorbers1CS27-0 / CS27-0
§27.477Landing gear arrangement1CS27-0 / CS27-0
§27.479Level landing conditions1CS27-0 / CS27-0
§27.481Tail-down landing conditions1CS27-0 / CS27-0
§27.483One-wheel landing conditions2CS27-0 / CS27-10
§27.485Lateral drift landing conditions1CS27-0 / CS27-0
§27.493Braked roll conditions2CS27-0 / CS27-10
§27.497Ground loading conditions: landing gear with tail wheels1CS27-0 / CS27-0
§27.501Ground loading conditions: landing gear with skids1CS27-0 / CS27-0
§27.505Ski landing conditions1CS27-0 / CS27-0
§27.521Float landing conditions1CS27-0 / CS27-0
§27.547Main rotor structure3CS27-0 / CS27-10
§27.549Fuselage, landing gear, and rotor pylon structures3CS27-0 / CS27-10
§27.561General1CS27-0 / CS27-0
§27.562Emergency landing dynamic conditions2CS27-0 / CS27-10
§27.571Fatigue evaluation of flight structure1CS27-0 / CS27-0
§27.573Damage Tolerance and Fatigue Evaluation of Composite2CS27-3 / CS27-10
Subpart C — Strength 1 section
SectionTitleVersionsFirst / latest
§27.563Structural ditching and emergency flotation provisions2CS27-0 / CS27-5
Subpart D — Design And Construction 60 sections
SectionTitleVersionsFirst / latest
§27.601Design1CS27-0 / CS27-0
§27.602Critical parts1CS27-0 / CS27-0
§27.603Materials1CS27-0 / CS27-0
§27.605Fabrication methods1CS27-0 / CS27-0
§27.607Fasteners1CS27-0 / CS27-0
§27.609Protection of structure1CS27-0 / CS27-0
§27.610Lightning and static electricity protection2CS27-0 / CS27-4
§27.611Inspection provisions1CS27-0 / CS27-0
§27.613Material strength properties and design values1CS27-0 / CS27-0
§27.619Special factors1CS27-0 / CS27-0
§27.623Bearing factors1CS27-0 / CS27-0
§27.625Fitting factors1CS27-0 / CS27-0
§27.629Flutter1CS27-0 / CS27-0
§27.631Bird strike1CS27-9 / CS27-9
§27.653Pressure venting and drainage of rotor blades1CS27-0 / CS27-0
§27.659Mass balance1CS27-0 / CS27-0
§27.661Rotor blade clearance1CS27-0 / CS27-0
§27.663Ground resonance prevention means1CS27-0 / CS27-0
§27.671General1CS27-0 / CS27-0
§27.672Stability augmentation, automatic, and power-operated systems1CS27-0 / CS27-0
§27.673Primary flight control1CS27-0 / CS27-0
§27.674Interconnected controls1CS27-0 / CS27-0
§27.675Stops1CS27-0 / CS27-0
§27.679Control system locks1CS27-0 / CS27-0
§27.681Limit load static tests1CS27-0 / CS27-0
§27.683Operation tests1CS27-0 / CS27-0
§27.685Control system details1CS27-0 / CS27-0
§27.687Spring devices1CS27-0 / CS27-0
§27.691Autorotation control mechanism1CS27-0 / CS27-0
§27.695Power boost and power- operated control system1CS27-0 / CS27-0
§27.723Shock absorption tests1CS27-0 / CS27-0
§27.725Limit drop test1CS27-0 / CS27-0
§27.727Reserve energy absorption drop test1CS27-0 / CS27-0
§27.729Retracting mechanism1CS27-0 / CS27-0
§27.731Wheels1CS27-0 / CS27-0
§27.733Tyres1CS27-0 / CS27-0
§27.735Brakes1CS27-0 / CS27-0
§27.737Skis1CS27-0 / CS27-0
§27.751Main float buoyancy1CS27-0 / CS27-0
§27.753Main float design1CS27-0 / CS27-0
§27.755Hulls1CS27-0 / CS27-0
§27.771Pilot compartment1CS27-0 / CS27-0
§27.773Pilot compartment view1CS27-0 / CS27-0
§27.775Windshields and windows1CS27-0 / CS27-0
§27.777Cockpit controls1CS27-0 / CS27-0
§27.779Motion and effect of cockpit controls1CS27-0 / CS27-0
§27.783Doors2CS27-0 / CS27-5
§27.785Seats, berths, safety belts, and harnesses1CS27-0 / CS27-0
§27.787Cargo and baggage compartments1CS27-0 / CS27-0
§27.801Ditching2CS27-0 / CS27-5
§27.802Emergency Flotation1CS27-5 / CS27-5
§27.831Ventilation1CS27-0 / CS27-0
§27.833Heaters1CS27-0 / CS27-0
§27.853Compartment interiors1CS27-0 / CS27-0
§27.855Cargo and baggage compartments1CS27-0 / CS27-0
§27.859Heating systems1CS27-0 / CS27-0
§27.861Fire protection of structure, controls, and other parts1CS27-0 / CS27-0
§27.863Flammable fluid fire protection1CS27-0 / CS27-0
§27.871Levelling marks1CS27-0 / CS27-0
§27.873Ballast provisions1CS27-0 / CS27-0
Subpart D — Design And 4 sections
SectionTitleVersionsFirst / latest
§27.621Casting factors2CS27-0 / CS27-10
§27.805Flight crew emergency exits3CS27-0 / CS27-10
§27.807Passenger emergency exits3CS27-0 / CS27-10
§27.865External loads4CS27-0 / CS27-10
Subpart E — Powerplant 58 sections
SectionTitleVersionsFirst / latest
§27.901Installation1CS27-0 / CS27-0
§27.903Engines2CS27-0 / CS27-1
§27.907Engine vibration1CS27-0 / CS27-0
§27.917Design1CS27-0 / CS27-0
§27.921Rotor brake1CS27-0 / CS27-0
§27.923Rotor drive system and control mechanism tests1CS27-0 / CS27-0
§27.927Additional tests1CS27-0 / CS27-0
§27.931Shafting critical speed1CS27-0 / CS27-0
§27.935Shafting joints1CS27-0 / CS27-0
§27.939Turbine engine operating characteristics1CS27-0 / CS27-0
§27.951General1CS27-0 / CS27-0
§27.952Fuel system crash resistance1CS27-0 / CS27-0
§27.953Fuel system independence1CS27-0 / CS27-0
§27.954Fuel system lightning protection1CS27-0 / CS27-0
§27.955Fuel flow1CS27-0 / CS27-0
§27.959Unusable fuel supply1CS27-0 / CS27-0
§27.961Fuel system hot weather operation1CS27-0 / CS27-0
§27.963Fuel tanks: general1CS27-0 / CS27-0
§27.965Fuel tank tests3CS27-0 / CS27-10
§27.967Fuel tank installation1CS27-0 / CS27-0
§27.969Fuel tank expansion space1CS27-0 / CS27-0
§27.971Fuel tank sump2CS27-0 / CS27-10
§27.973Fuel tank filler connection1CS27-0 / CS27-0
§27.975Fuel tank vents1CS27-0 / CS27-0
§27.977Fuel tank outlet1CS27-0 / CS27-0
§27.991Fuel pumps1CS27-0 / CS27-0
§27.993Fuel system lines and fittings1CS27-0 / CS27-0
§27.995Fuel valves1CS27-0 / CS27-0
§27.997Fuel strainer or filter1CS27-0 / CS27-0
§27.999Fuel system drains1CS27-0 / CS27-0
§27.1011Engines: general2CS27-0 / CS27-10
§27.1013Oil tanks1CS27-0 / CS27-0
§27.1015Oil tank tests1CS27-0 / CS27-0
§27.1017Oil lines and fittings1CS27-0 / CS27-0
§27.1019Oil strainer or filter1CS27-0 / CS27-0
§27.1021Oil system drains1CS27-0 / CS27-0
§27.1027Transmissions and gearboxes: general1CS27-0 / CS27-0
§27.1041General1CS27-0 / CS27-0
§27.1043Cooling tests1CS27-0 / CS27-0
§27.1045Cooling test procedures1CS27-0 / CS27-0
§27.1091Air induction1CS27-0 / CS27-0
§27.1093Induction system icing protection1CS27-0 / CS27-0
§27.1121General1CS27-0 / CS27-0
§27.1123Exhaust piping1CS27-0 / CS27-0
§27.1141Powerplant controls: general1CS27-0 / CS27-0
§27.1143Engine controls1CS27-0 / CS27-0
§27.1145Ignition switches1CS27-0 / CS27-0
§27.1147Mixture controls1CS27-0 / CS27-0
§27.1151Rotor brake controls1CS27-0 / CS27-0
§27.1163Powerplant accessories1CS27-0 / CS27-0
§27.1183Lines, fittings, and components1CS27-0 / CS27-0
§27.1185Flammable fluids1CS27-0 / CS27-0
§27.1187Ventilation and drainage1CS27-0 / CS27-0
§27.1189Shut-off means1CS27-0 / CS27-0
§27.1191Firewalls1CS27-0 / CS27-0
§27.1193Cowling and engine compartment covering1CS27-0 / CS27-0
§27.1194Other surfaces1CS27-0 / CS27-0
§27.1195Fire detector systems1CS27-0 / CS27-0
Subpart F — Equipment 45 sections
SectionTitleVersionsFirst / latest
§27.1301Function and installation1CS27-0 / CS27-0
§27.1302Installed systems and equipment for use by the crew members1CS27-8 / CS27-8
§27.1303Flight and navigation instruments1CS27-0 / CS27-0
§27.1305Powerplant instruments4CS27-0 / CS27-10
§27.1307Miscellaneous equipment1CS27-0 / CS27-0
§27.1309Equipment, systems, and installations3CS27-0 / CS27-10
§27.1316Electrical and electronic system lightning protection1CS27-4 / CS27-4
§27.1317High-Intensity Radiated1CS27-4 / CS27-4
§27.1319Equipment, systems and network information security protection1CS27-7 / CS27-7
§27.1321Arrangement and visibility1CS27-0 / CS27-0
§27.1322Warning, caution, and advisory lights1CS27-0 / CS27-0
§27.1323Airspeed indicating system1CS27-0 / CS27-0
§27.1325Static pressure systems1CS27-0 / CS27-0
§27.1327Magnetic direction indicator1CS27-0 / CS27-0
§27.1329Automatic pilot system1CS27-0 / CS27-0
§27.1335Flight director systems1CS27-0 / CS27-0
§27.1337Powerplant instruments2CS27-0 / CS27-9
§27.1351General1CS27-0 / CS27-0
§27.1353Storage battery design and installation1CS27-0 / CS27-0
§27.1357Circuit protective devices1CS27-0 / CS27-0
§27.1361Master switch1CS27-0 / CS27-0
§27.1365Electric cables1CS27-0 / CS27-0
§27.1367Switches1CS27-0 / CS27-0
§27.1381Instrument lights1CS27-0 / CS27-0
§27.1383Landing lights1CS27-0 / CS27-0
§27.1385Position light system installation1CS27-0 / CS27-0
§27.1387Position light system dihedral angles1CS27-0 / CS27-0
§27.1389Position light distribution and intensities1CS27-0 / CS27-0
§27.1391Minimum intensities in the horizontal plane of forward and rear position lights1CS27-0 / CS27-0
§27.1393Minimum intensities in any vertical plane of forward and rear position lights2CS27-0 / CS27-10
§27.1395Maximum intensities in overlapping beams of forward and rear position lights1CS27-0 / CS27-0
§27.1397Colour specifications1CS27-0 / CS27-0
§27.1399Riding light1CS27-0 / CS27-0
§27.1401Anti-collision light system2CS27-0 / CS27-10
§27.1411General3CS27-0 / CS27-10
§27.1413Safety belts1CS27-0 / CS27-0
§27.1415Ditching equipment3CS27-0 / CS27-10
§27.1419Ice protection1CS27-0 / CS27-0
§27.1435Hydraulic systems1CS27-0 / CS27-0
§27.1457Cockpit voice recorders1CS27-0 / CS27-0
§27.1458Lightweight flight recorder1CS27-10 / CS27-10
§27.1459Flight recorders1CS27-0 / CS27-0
§27.1461Equipment containing high energy rotors1CS27-0 / CS27-0
§27.1470Emergency locator transmitter1CS27-5 / CS27-5
CS-27 D27HIRF Environments and Equipment HIRF Test Levels2CS27-4 / CS27-10
Subpart G — Operating Limitations And Information 22 sections
SectionTitleVersionsFirst / latest
§27.1501General2CS27-0 / CS27-4
§27.1503Airspeed limitations: general1CS27-0 / CS27-0
§27.1519Weight and centre of gravity1CS27-0 / CS27-0
§27.1521Powerplant limitations2CS27-0 / CS27-3
§27.1523Minimum flight crew1CS27-0 / CS27-0
§27.1525Kinds of operations1CS27-0 / CS27-0
§27.1527Maximum operating altitude1CS27-0 / CS27-0
§27.1529Instructions for Continued1CS27-0 / CS27-0
§27.1541General1CS27-0 / CS27-0
§27.1543Instrument markings: general1CS27-0 / CS27-0
§27.1547Magnetic direction indicator1CS27-0 / CS27-0
§27.1551Oil quantity indicator1CS27-0 / CS27-0
§27.1553Fuel quantity indicator1CS27-0 / CS27-0
§27.1557Miscellaneous markings and placards2CS27-0 / CS27-5
§27.1559Limitations placard1CS27-0 / CS27-0
§27.1561Safety equipment2CS27-0 / CS27-5
§27.1565Tail rotor1CS27-0 / CS27-0
§27.1581General1CS27-0 / CS27-0
§27.1583Operating limitations1CS27-0 / CS27-0
§27.1585Operating procedures1CS27-0 / CS27-0
§27.1587Performance information3CS27-0 / CS27-5
§27.1589Loading information1CS27-0 / CS27-0
Subpart G — Operating Limitations And 1 section
SectionTitleVersionsFirst / latest
§27.1505Never-exceed speed2CS27-0 / CS27-10
Subpart G — Operating Limitations 6 sections
SectionTitleVersionsFirst / latest
§27.1509Rotor speed2CS27-0 / CS27-10
§27.1545Airspeed indicator2CS27-0 / CS27-10
§27.1549Powerplant instruments2CS27-0 / CS27-10
§27.1555Control markings3CS27-0 / CS27-10
§27.1593Exposure to volcanic cloud hazards2CS27-4 / CS27-10
CS-27 A27Instructions for Continued Airworthiness5CS27-0 / CS27-10
Report an issue

Report an issue

Is something wrong with what you are looking at? Tell the maintainer; the report is filed against this page.

What kind of issue is it? (required)

Reports are posted publicly on GitHub with the address of this page. Please don't include personal information.