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Section 412 Aircraft-Related Occupancies
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[F] TABLE 412.3.6
Aircraft-related occupancies shall comply with Sections 412.1 through 412.7 and the International Fire Code.
The provisions of Sections 412.2.1 through 412.2.6 shall apply to airport traffic control towers occupied only for the following uses:
- Airport traffic control cab.
- Electrical and mechanical equipment rooms.
- Airport terminal radar and electronics rooms.
- Office spaces incidental to the tower operation.
- Lounges for employees, including sanitary facilities.
Airport traffic control towers shall be constructed to comply with the height limitations of Table 412.2.1.1.
TABLE 412.2.1.1
HEIGHT LIMITATIONS FOR AIRPORT TRAFFIC CONTROL TOWERS
| TYPE OF CONSTRUCTION | HEIGHTa (feet) |
| IA | Unlimited |
| IB | 240 |
| IIA | 100 |
| IIB | 85 |
| IIIA | 65 |
For SI: 1 foot = 304.8 mm, 1 square foot = 0.0929 m2.
- Height to be measured from grade plane to cab floor.
Enclosures for interior exit stairways and elevator hoistway enclosures shall comply with Section 403.2.2 in airport traffic control towers where the control cab is located more than 75 feet (22 860 mm) above the lowest level of fire department vehicle access.
The bond strength of the SFRM installed in airport traffic control towers shall be in accordance with Section 403.2.3 where the control cab is located more than 75 feet (22 860 mm) above the lowest level of fire department vehicle access.
The means of egress in airport traffic control towers shall comply with Sections 412.2.2.1 through 412.2.2.3.
Stairways in airport traffic control towers shall be in accordance with Section 1011. Exit stairways shall be smokeproof enclosures complying with one of the alternatives provided in Section 909.20.
Exception: Stairways in airport traffic control towers are not required to comply with Section 1011.12.
From observation levels, airport traffic control towers shall be permitted to have a single means of exit access for a distance of travel not greater than 100 feet (30 480 mm). Exit access stairways from the observation level need not be enclosed.
Not less than one exit stairway shall be permitted for airport traffic control towers of any height provided that the occupant load per floor is not greater than 15 and the area per floor does not exceed 1,500 square feet (140 m2).
Where an airport traffic control tower is provided with only one exit stairway, interior wall and ceiling finishes shall be either Class A or Class B.
Where an airport traffic control tower is equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 and two exits are required, the exit separation distance required by Section 1007 shall be not less than one-fourth of the length of the maximum overall dimension of the area served.
Airport traffic control towers shall be provided with an automatic smoke detection system installed in accordance with Section 907.2.22.
A fire command center shall be provided in airport traffic control towers where the control cab is located more than 75 feet (22 860 mm) above the lowest level of fire department vehicle access. The fire command center shall comply with Section 911.
Exceptions:
- The fire command center shall be located in the airport control tower or an adjacent contiguous building where building functions are interdependent.
- The room shall be not less than 150 square feet (14 m2) in area with a minimum dimension of 10 feet (3048 mm).
-
The following features shall not be required in an airport traffic control tower fire command center.3.1. Emergency voice/alarm control unit.3.2. Public address system.3.3. Status indicators and controls for the air distributions centers.3.4. Generator supervision devices, manual start and transfer features.3.5. Elevator emergency or standby power switches where emergency or standby power is provided.
Smoke removal in airport traffic control towers shall be provided in accordance with Section 403.4.7.
Where an occupied floor is located more than 35 feet (10 668 mm) above the lowest level of fire department vehicle access, airport traffic control towers shall be equipped with an automatic sprinkler system in accordance with Section 903.3.1.1.
Fire pumps shall be located in rooms that are separated from all other areas of the building by 2-hour fire barriers constructed in accordance with Section 707 or 2-hour horizontal assemblies constructed in accordance with Section 711, or both.
Exception: Separation is not required for fire pumps physically separated in accordance with NFPA 20.
Wiring and cables serving elevators in airport traffic control towers shall be protected in accordance with Section 3007.8.1.
Where provided in addition to an exit stairway, occupant evacuation elevators shall be in accordance with Section 3008.
Airport traffic control towers shall be accessible except as specified in Section 1104.4.
Exterior walls located less than 30 feet (9144 mm) from lot lines or a public way shall have a fire-resistance rating not less than 2 hours.
Floors shall be graded and drained to prevent water or fuel from remaining on the floor. Floor drains shall discharge through an oil separator to the sewer or to an outside vented sump.
Exception: Aircraft hangars with individual lease spaces not exceeding 2,000 square feet (186 m2) each in which servicing, repairing or washing is not conducted and fuel is not dispensed shall have floors that are graded toward the door, but shall not require a separator.
Heating equipment shall be placed in another room separated by 2-hour fire barriers constructed in accordance with Section 707 or horizontal assemblies constructed in accordance with Section 711, or both. Entrance shall be from the outside or by means of a vestibule providing a two-doorway separation.
Exceptions:
- Unit heaters and vented infrared radiant heating equipment suspended not less than 10 feet (3048 mm) above the upper surface of wings or engine enclosures of the highest aircraft that are permitted to be housed in the hangar need not be located in a separate room provided that they are mounted not less than 8 feet (2438 mm) above the floor in shops, offices and other sections of the hangar communicating with storage or service areas.
- Entrance to the separated room shall be permitted by a single interior door provided that the sources of ignition in the appliances are not less than 18 inches (457 mm) above the floor.
The process of "doping," involving use of a volatile flammable solvent, or of painting, shall be carried on in a separate detached building equipped with automatic fire-extinguishing equipment in accordance with Section 903.
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.
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.
- 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.
- Groups shall be as classified in accordance with NFPA 409.
- Membrane structures complying with Section 3102 shall be classified as a Group IV hangar.
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:
- Doping.
- Hot work including, but not limited to, welding, torch cutting and torch soldering.
- Fuel transfer.
- Fuel tank repair or maintenance not including defueled tanks in accordance with NFPA 409, inerted tanks or tanks that have never been fueled.
- Spray finishing operations.
- Total fuel capacity of all aircraft within the unsprinklered single fire area in excess of 1,600 gallons (6057 L).
- 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.
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.
A hangar shall not be attached to a dwelling unless separated by a fire barrier having a fire-resistance rating of not less than 1 hour. Such separation shall be continuous from the foundation to the underside of the roof and unpierced except for doors leading to the dwelling unit. Doors into the dwelling unit shall be equipped with self-closing devices and conform to the requirements of Section 716 with a noncombustible raised sill not less than 4 inches (102 mm) in height. Openings from a hangar directly into a room used for sleeping purposes shall not be permitted.
A hangar shall provide two means of egress. One of the doors into the dwelling shall be considered as meeting only one of the two means of egress.
Smoke alarms shall be provided within the hangar in accordance with Section 907.2.22.
Electrical, mechanical and plumbing drain, waste and vent (DWV) systems installed within the hangar shall be independent of the systems installed within the dwelling. Building sewer lines shall be permitted to be connected outside the structures.
Exception: Smoke detector wiring and feed for electrical subpanels in the hangar.
Residential aircraft hangars shall be not greater than 2,000 square feet (186 m2) in area and 20 feet (6096 mm) in building height.
Aircraft painting operations shall be conducted in an aircraft paint hangar that complies with the provisions of Sections 412.5.1 through 412.5.8. Buildings and structures, or parts thereof, used for the application of flammable finishes shall comply with the applicable provisions of Section 416.
Aircraft paint hangars shall be classified in accordance with the provisions of Section 307.1. Aircraft paint hangars shall comply with the applicable requirements of this code and the International Fire Code for such occupancy.
Aircraft paint hangars shall be of Type I or II construction.
Spray equipment cleaning operations shall be conducted in a liquid use, dispensing and mixing room.
Only those flammable liquids necessary for painting operations shall be permitted in quantities less than the maximum allowable quantities per control area in Table 307.1(1). Spray equipment cleaning operations exceeding the maximum allowable quantities per control area in Table 307.1(1) shall be conducted in a liquid use, dispensing and mixing room.
Storage of flammable or combustible liquids exceeding the maximum allowable quantities per control area in Table 307.1(1) shall be in a liquid storage room.
Aircraft paint hangars shall be provided with fire suppression as required by NFPA 409.
Aircraft paint hangars shall be provided with ventilation as required in the International Mechanical Code.
Electrical equipment and devices within the aircraft paint hangar shall comply with NFPA 70.
The area within 10 feet (3048 mm) horizontally from aircraft surfaces and from the floor to 10 feet (3048 mm) above the aircraft surface shall be classified as a Class I, Division I location.
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