SECTION 412
AIRCRAFT-RELATED OCCUPANCIES
412.1 Airport traffic control
towers.
412.1.1 General. The
provisions of this section shall apply to airport traffic
control towers not exceeding 1,500 square feet (140 m2)
per floor occupied only for the following uses:
1. Airport traffic
control cab.
2. Electrical
and mechanical equipment rooms.
3. Airport terminal
radar and electronics rooms.
4. Office spaces
incidental to the tower operation.
5.
Lounges for employees, including sanitary facilities.
412.1.2
Type of construction. Airport traffic control towers
shall be constructed to comply with the height and area
limitations of Table 412.1.2.
412.1.3 Egress.
A minimum of one exit stairway shall be permitted for airport
traffic control towers of any height provided that the occupant
load per floor does not exceed 15. The stairway shall conform
to the requirements of Section 1009.
The stairway shall be separated from elevators by a minimum
distance of one-half of the diagonal of the area served measured
in a straight line. The exit stairway and elevator hoist
way are permitted to be located in the same shaft enclosure,
provided they are separated from each other by a 4-hour fire
barrier having no openings. Such stairway shall be pressurized
to a minimum of 0.15 inch of water column (43 Pa) and a maximum
of 0.35 inch of water column (101 Pa) in the shaft relative
to the building with stairway doors closed. Stairways need
not extend to the roof as specified in Section
1009.11. The provisions of Section 403
do not apply.
Exception: Smoke proof
enclosures as set forth in Section
1020.1.7 are not required where required stairways are
pressurized.
[F] 412.1.4 Automatic fire
detection systems. Airport traffic control towers shall
be provided with an automatic fire detection system installed
in accordance with Section 907.2.
[F] 412.1.5 Standby power.
A standby power system that conforms to Section
2702 shall be provided in airport traffic control towers
more than 65 feet (19 812 mm) in height. Power shall be
provided to the following equipment:
1.
Pressurization equipment, mechanical equipment and lighting.
2.
Elevator
operating equipment.
3.
Fire
alarm and smoke detection systems.
412.1.6
Accessibility. Airport traffic control towers need not
be accessible as specified in the provisions of Chapter
11.
412.2 Aircraft hangars. Aircraft
hangars shall be in accordance with Sections 412.2.1 through
412.2.6.
412.2.1 Exterior walls.
Exterior walls located less than 30 feet (9 144 mm) from property
lines, lot lines or a public way shall have a fire-resistance
rating not less than 2 hours.
412.2.2 Basements. Where
hangars have basements, the floor over the basement shall
be of Type IA construction and shall be made tight against
seepage of water, oil or vapors. There shall be no opening
or communication between the basement and the hangar. Access
to the basement shall be from outside only.
412.2.3 Floor surface.
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.
412.2.4 Heating equipment.
Heating equipment shall be placed in another room separated
by 2-hour fire-resistance-rated construction. Entrance shall
be from the outside or by means of a vestibule providing a two-doorway
separation.
Exceptions:
1. Unit
heaters and vented infrared radiant heating I equipment
suspended at least 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 and at least
8 feet (2438 mm) above the floor in shops, offices and
other sections of the hangar communicating with storage
or service areas.
2. A
single interior door shall be allowed, provided the sources
of ignition in the appliances are at least 18 inches (457
mm) above the floor.
412.2.5
Finishing. 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.
[F]
412.2.6 Fire suppression. Aircraft hangars shall be
provided with fire suppression as required by NFPA 409.
Exception:
Group II hangars as defined in NFPA 409 storing private aircraft
without major maintenance or overhaul are exempt from foam
suppression requirements.
412.3
Residential aircraft hangars. Residential aircraft hangars
as defined in Section 412.3.1 shall comply with Sections 412.3.2
through 412.3.6.
412.3.1
Definition. The following word and term shall, for the
purposes of this chapter and as used elsewhere in this code,
have the meaning shown herein.
RESIDENTIAL
AIRCRAFT HANGAR. An accessory building less than 2,000
square feet (186 m2) and 20 feet (6096 mm) in height,
constructed on a one- or two-family residential property where
aircraft are stored. Such use will be considered as a residential
accessory use incidental to the dwelling.
412.3.2 Fire separation.
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 un pierced except
for doors leading to the dwelling unit. Doors into the dwelling
unit must be equipped with self-closing devices and conform
to the requirements of Section 715 with
at least a 4- inch (102 mm) noncombustible raised sill. Openings
from a hanger directly into a room used for sleeping purposes
shall not be permitted.
412.3.3 Egress. 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.
[F] 412.3.4 Smoke alarms.
Smoke alarms shall be provided within the hangar in accordance
with Section 907.2.21.
412.3.5 Independent systems.
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 connect outside the structures.
Exception:
Smoke detector wiring and feed for electrical sub panels
in the hangar.
412.3.6
Height and area limits. Residential aircraft hangars
shall not exceed 2,000 square feet (186 m2) in
area and 20 feet (6096 mm) in height.
[F]
412.4 Aircraft paint hangars. Aircraft painting operations
where flammable liquids are used in excess of the maximum
allowable quantities per control area listed in Table
307.7(1) shall be conducted in an aircraft paint hangar
that complies with the provisions of Section 412.4.
[F] 412.4.1 Occupancy group.
Aircraft paint hangars shall be classified as Group H-2. Aircraft
paint hangars shall comply with the applicable requirements
of this code and the International Fire Code for such
occupancy.
412.4.2 Construction.
The aircraft paint hangar shall be of Type I or II construction.
[F] 412.4.3 Operations.
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 shall be
conducted in a liquid use, dispensing and mixing room.
[F]412.4.4 Storage. Storage
of flammable liquids shall be in a liquid storage room.
[F] 412.4.5 Fire suppression.
Aircraft paint hangars shall be provided with fire suppression
as required by NFPA 409.
412.4.6 Ventilation.
Aircraft paint hangars shall be provided with ventilation
as required in the International Mechanical Code.
412.5 Heliports and helistops.
Heliports and helistops shall be permitted to be erected on
buildings or other locations where they are constructed in
accordance with this section.
412.5.1 Definitions. The
following words and terms shall, for the purposes of this
chapter and as used elsewhere in this code, have the meanings
shown herein.
HELIPORT.
An area of land or water or a structural surface that is used,
or intended for use, for the landing and taking off of helicopters,
and any appurtenant areas that are used, or intended for use,
for heliport buildings and other heliport facilities.
HELISTOP.
The same as a "Heliport," except that no fueling,
defueling, maintenance, repairs or storage of helicopters
is permitted.
412.5.2 Size. The landing
area for helicopters less than
3,500
pounds (1588 kg) shall be a minimum of 20 feet (6096 mm) in
length and width. The landing area shall be surrounded on
all sides by a clear area having a minimum average width at
roof level of 15 feet (4572 mm) but with no width less than
5 feet (1524 mm).
412.5.3 Design. Helicopter
landing areas and the supports thereof on the roof of a building
shall be noncombustible construction. Landing areas shall
be designed to confine any flammable liquid spillage to the
landing area itself and provisions shall be made to drain
such spillage away from any exit or stairway serving the helicopter
landing area or from a structure housing such exit or stairway.
For structural design requirements, see Section
1605.5.
412.5.4 Means of egress.
The means of egress from heliports and helistops shall comply
with the provisions of Chapter 10. Landing areas located on
buildings or structures shall have two or more means of egress.
For landing areas less than 60 feet (18 288 mm) in length,
or less than 2,000 square feet (186 m2) in area,
the second means of egress may be a fire escape or ladder
leading to the floor below.
412.5.5 Rooftop heliports and
helistops. Rooftop heliports and helistops shall comply
with NFPA 418.
|