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[F] 412.3.6 Fire Suppression

Building Code 2021 of Illinois > 4 Special Detailed Requirements Based on Occupancy and Use > 412 Aircraft-Related Occupancies > 412.3 Aircraft Hangars > 412.3.6 Fire Suppression
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Aircraft hangars shall be provided with a fire suppression system designed in accordance with NFPA 409, based on the classification for the hangar given in Table 412.3.6.
Exception: Where a fixed base operator has separate repair facilities on site, Group II hangars operated by a fixed base operator used for storage of transient aircraft only shall have a fire suppression system, but the system is exempt from foam requirements.
[F] TABLE 412.3.6
HANGAR FIRE SUPPRESSION REQUIREMENTSa, b, c
MAXIMUM SINGLE FIRE AREA (square feet) TYPE OF CONSTRUCTION
IA IB IIA IIB IIIA IIIB IV VA VB
≥ 40,001 Group I Group I Group I Group I Group I Group I Group I Group I Group I
40,000 Group II Group II Group II Group II Group II Group II Group II Group II Group II
30,000 Group III Group II Group II Group II Group II Group II Group II Group II Group II
20,000 Group III Group III Group II Group II Group II Group II Group II Group II Group II
15,000 Group III Group III Group III Group II Group III Group II Group III Group II Group II
12,000 Group III Group III Group III Group III Group III Group III Group III Group II Group II
8,000 Group III Group III Group III Group III Group III Group III Group III Group III Group II
5,000 Group III Group III Group III Group III Group III Group III Group III Group III Group III
For SI: 1 foot = 304.8 mm, 1 square foot = 0.0929 m2.
  1. Aircraft hangars with a door height greater than 28 feet shall be provided with fire suppression for a Group I hangar regardless of maximum fire area.
  2. Groups shall be as classified in accordance with NFPA 409.
  3. Membrane structures complying with Section 3102 shall be classified as a Group IV hangar.
[F] 412.3.6.1 Hazardous Operations
Any Group III aircraft hangar according to Table 412.3.6 that contains hazardous operations including, but not limited to, the following shall be provided with a Group I or II fire suppression system in accordance with NFPA 409 as applicable:
  1. Doping.
  2. Hot work including, but not limited to, welding, torch cutting and torch soldering.
  3. Fuel transfer.
  4. Fuel tank repair or maintenance not including defueled tanks in accordance with NFPA 409, inerted tanks or tanks that have never been fueled.
  5. Spray finishing operations.
  6. Total fuel capacity of all aircraft within the unsprinklered single fire area in excess of 1,600 gallons (6057 L).
  7. Total fuel capacity of all aircraft within the maximum single fire area in excess of 7,500 gallons (28 390 L) for a hangar with an automatic sprinkler system in accordance with Section 903.3.1.1.
[F] 412.3.6.2 Separation of Maximum Single Fire Areas
Maximum single fire areas established in accordance with hangar classification and construction type in Table 412.3.6 shall be separated by 2-hour fire walls constructed in accordance with Section 706. In determining the maximum single fire area as set forth in Table 412.3.6, ancillary uses that are separated from aircraft servicing areas by a fire barrier of not less than 1 hour, constructed in accordance with Section 707, shall not be included in the area.
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