NFPA 409: Standard on Aircraft Hangars

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Major changes in the 2016 edition of NFPA 409 impact the design of fire protection systems in new Group I and Group II aircraft hangars.

Revised based on sound engineering principles, the latest test data, and recent field experience, NFPA 409: Standard on Aircraft Hangars provides specifications for construction and fire protection of all types of aircraft hangars.

Engineers, designers, architects, contractors, installers, facility and construction managers, insurance professionals, and others responsible for the safety of people, facilities, and equipment, need to know how revisions in the new NFPA 409 impact their work.

Significant changes make the Standard easier and more cost-effective to apply in certain scenarios:

  • Low-level foam systems in Group I hangars can now be divided into zones that are independently activated, based on activation of an associated sprinkler zone or automatic detection zone.
  • Revised requirement for a minimum of two fire pumps specifies that a redundant pump will not be required for systems that use two or more pumps to meet the minimum demand.
  • Reserve supply of foam concentrate now permitted to meet the requirements of the 2016 edition NFPA 11: Standard for Low-, Medium-, and High-Expansion Foam, which does not require a connected reserve.
  • The requirement for water reservoirs to be divided into equal parts has been relaxed to a recommendation.
  • The chapter on Group III hangars has been simplified by eliminating the concepts of row hangars and hangar building clusters.
  • Minimum separation between aircraft storage and servicing areas in Group I and Group II hangars has been relaxed from a 3-hour fire wall to a 2-hour fire barrier wall.

Editorial changes and updated references to other codes and standards make the 2016 NFPA 409 an industry essential. (Softbound, 39 pp., 2016)

NFPA® 409 Standard on Aircraft Hangars 2016 Edition

Chapter 1 Administration
1.1 Scope.
1.2 Purpose.
1.3 Equivalency.
1.4 New Technology.
1.5 Units.
Chapter 2 Referenced Publications
2.1 General.
2.2 NFPA Publications.
2.3 Other Publications.
2.4 References for Extracts in Mandatory Sections.
Chapter 3 Definitions
3.1 General.
3.2 NFPA Official Definitions.
3.3 General Definitions.
Chapter 4 Aircraft Hangar Groups
4.1 Aircraft Hangar Classification.
Chapter 5 Construction of Group I and Group II Aircraft Hangars
5.1 Types of Construction.
5.2 Internal Separations.
5.3 Clear Space Distance Requirements Around Hangars.
5.4 Floors.
5.5 Roofs.
5.6 Primary Structural Steel Columns Supporting the Roof.
5.7 Doors.
5.8 Curtains.
5.9 Landing Gear Pits, Ducts, and Tunnels.
5.10 Exposed Interior Insulation.
5.11 Drainage of Aprons and Hangar Floors.
5.12 Heating and Ventilating.
5.13 Lighting and Electrical Systems.
5.14 Lightning Protection.
5.15 Grounding Facilities for Static Electricity.
5.16 Exit and Access Requirements.
5.17 Draft Curtains.
Chapter 6 Protection of Group I Aircraft Hangars
6.1 General.
6.2 Fire Protection Systems.
6.3 Wheeled and Portable Extinguishers.
6.4 Protection System Alarms.
Chapter 7 Protection of Group II Aircraft Hangars
7.1 General.
7.2 Closed-Head Water Sprinkler System for Aircraft Storage and Servicing Areas.
7.3 Foam Concentrate — General.
7.4 Low-Expansion Foam System.
7.5 High-Expansion Foam System.
7.6 Closed-Head Foam-Water Sprinkler System.
7.7 Detection and Actuation Systems.
7.8 Water Supply.
Chapter 8 Group III Aircraft Hangars
8.1 Construction.
8.2 Separation and Internal Subdivisions.
8.3 Heating and Ventilating.
8.4 Lighting and Electrical Systems.
8.5 Lightning Protection.
8.6 Grounding Facilities for Static Electricity.
8.7 Exit and Access Requirements.
8.8 Fire Protection for Group III Hangars.
Chapter 9 Group IV Aircraft Hangars
9.1 Construction.
9.2 Internal Separations.
9.3 Clear Space Distance Around Hangars.
9.4 Aprons and Floors.
9.5 Doors.
9.6 Curtains.
9.7 Landing Gear Pits, Ducts, and Tunnels.
9.8 Exposed Interior Insulation.
9.9 Drainage of Aprons and Hangar Floors.
9.10 Heating and Ventilating.
9.11 Lighting and Electrical Systems.
9.12 Grounding Facilities for Static Electricity.
9.13 Exit and Access Requirements.
9.14 Fire Protection for Membrane-Covered Rigid-Steel-Frame-Structure Hangars.
Chapter 10 Paint Hangars
10.1 Construction.
10.2 Fire Protection.
10.3 Ventilation.
10.4 Electrical Equipment.
10.5 Operations.
Chapter 11 Inspection, Testing, and Maintenance
11.1 Fire Protection Systems.
Chapter 12 Unfueled Aircraft Hangars
12.1 General.
12.2 Construction.
12.3 Lighting and Electrical Systems.
12.4 Grounding Facilities for Static Electricity.
12.5 Protection of Unfueled Aircraft Hangars.
12.6 Spray Application of Flammable and Combustible Liquids.
12.7 Portable Extinguishers.
12.8 Protection System Alarms.
Annex A Explanatory Material
Annex B Building Construction Types
Annex C Informational References