title-14-part-25-sec25-819

299

Federal Aviation Administration, DOT

§ 25.819

(3) For each Type III exit, regardless

of the passenger capacity of the air-
plane in which it is installed, there
must be placards that—

(i) Are readable by all persons seated

adjacent to and facing a passageway to
the exit;

(ii) Accurately state or illustrate the

proper method of opening the exit, in-
cluding the use of handholds; and

(iii) If the exit is a removable hatch,

state the weight of the hatch and indi-
cate an appropriate location to place
the hatch after removal.

(d) If it is necessary to pass through

a passageway between passenger com-
partments to reach any required emer-
gency exit from any seat in the pas-
senger cabin, the passageway must be
unobstructed. However, curtains may
be used if they allow free entry
through the passageway.

(e) No door may be installed between

any passenger seat that is occupiable
for takeoff and landing and any pas-
senger emergency exit, such that the
door crosses any egress path (including
aisles, crossaisles and passageways).

(f) If it is necessary to pass through a

doorway separating any crewmember
seat (except those seats on the
flightdeck), occupiable for takeoff and
landing, from any emergency exit, the
door must have a means to latch it in
the open position. The latching means
must be able to withstand the loads
imposed upon it when the door is sub-
jected to the ultimate inertia forces,
relative to the surrounding structure,
listed in § 25.561(b).

[Amdt. 25–1, 30 FR 3204, Mar. 9, 1965, as
amended by Amdt. 25–15, 32 FR 13265, Sept.
20, 1967; Amdt. 25–32, 37 FR 3971, Feb. 24, 1972;
Amdt. 25–46, 43 FR 50597, Oct. 30, 1978; Amdt.
25–72, 55 FR 29783, July 20, 1990; Amdt. 25–76,
57 FR 19244, May 4, 1992; Amdt. 25–76, 57 FR
29120, June 30, 1992; Amdt. 25–88, 61 FR 57958,
Nov. 8, 1996; Amdt. 25–116, 69 FR 62788, Oct.
27, 2004; Amdt. 25–128, 74 FR 25645, May 29,
2009]

§ 25.815

Width of aisle.

The passenger aisle width at any

point between seats must equal or ex-
ceed the values in the following table:

Passenger seating capacity

Minimum passenger

aisle width (inches)

Less than

25 in. from

floor

25 in. and

more from

floor

10 or less .......................................

12 15

11 through 19 ................................

20 or more .....................................

A narrower width not less than 9 inches may be approved

when substantiated by tests found necessary by the
Administrator.

[Amdt. 25–15, 32 FR 13265, Sept. 20, 1967, as
amended by Amdt. 25–38, 41 FR 55466, Dec. 20,
1976]

§ 25.817

Maximum number of seats

abreast.

On airplanes having only one pas-

senger aisle, no more than three seats
abreast may be placed on each side of
the aisle in any one row.

[Amdt. 25–15, 32 FR 13265, Sept. 20, 1967]

§ 25.819

Lower deck service compart-

ments (including galleys).

For airplanes with a service compart-

ment located below the main deck,
which may be occupied during taxi or
flight but not during takeoff or land-
ing, the following apply:

(a) There must be at least two emer-

gency evacuation routes, one at each
end of each lower deck service com-
partment or two having sufficient sepa-
ration within each compartment,
which could be used by each occupant
of the lower deck service compartment
to rapidly evacuate to the main deck
under normal and emergency lighting
conditions. The routes must provide for
the evacuation of incapacitated per-
sons, with assistance. The use of the
evacuation routes may not be depend-
ent on any powered device. The routes
must be designed to minimize the pos-
sibility of blockage which might result
from fire, mechanical or structural
failure, or persons standing on top of or
against the escape routes. In the event
the airplane’s main power system or
compartment main lighting system
should fail, emergency illumination for
each lower deck service compartment
must be automatically provided.

(b) There must be a means for two-

way voice communication between the
flight deck and each lower deck service
compartment, which remains available

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14 CFR Ch. I (1–1–24 Edition)

§ 25.820

following loss of normal electrical
power generating system.

gency alarm system, audible during
normal and emergency conditions, to
enable crewmembers on the flight deck
and at each required floor level emer-
gency exit to alert occupants of each
lower deck service compartment of an
emergency situation.

(d) There must be a means, readily

detectable by occupants of each lower
deck service compartment, that indi-
cates when seat belts should be fas-
tened.

(e) If a public address system is in-

stalled in the airplane, speakers must
be provided in each lower deck service
compartment.

(f) For each occupant permitted in a

lower deck service compartment, there
must be a forward or aft facing seat
which meets the requirements of
§ 25.785(d), and must be able to with-
stand maximum flight loads when oc-
cupied.

(g) For each powered lift system in-

stalled between a lower deck service
compartment and the main deck for
the carriage of persons or equipment,
or both, the system must meet the fol-
lowing requirements:

(1) Each lift control switch outside

the lift, except emergency stop but-
tons, must be designed to prevent the
activation of the life if the lift door, or
the hatch required by paragraph (g)(3)
of this section, or both are open.

(2) An emergency stop button, that

when activated will immediately stop
the lift, must be installed within the
lift and at each entrance to the lift.

(3) There must be a hatch capable of

being used for evacuating persons from
the lift that is openable from inside
and outside the lift without tools, with
the lift in any position.

[Amdt. 25–53, 45 FR 41593, June 19, 1980; 45 FR
43154, June 26, 1980; Amdt. 25–110; 68 FR 36883,
June 19, 2003]

§ 25.820

Lavatory doors.

All lavatory doors must be designed

to preclude anyone from becoming
trapped inside the lavatory. If a lock-
ing mechanism is installed, it must be

capable of being unlocked from the
outside without the aid of special tools.

[Doc. No. 2003–14193, 69 FR 24502, May 3, 2004]

ENTILATION AND

EATING

§ 25.831

Ventilation.

(a) Under normal operating condi-

tions and in the event of any probable
failure conditions of any system which
would adversely affect the ventilating
air, the ventilation system must be de-
signed to provide a sufficient amount
of uncontaminated air to enable the
crewmembers to perform their duties
without undue discomfort or fatigue
and to provide reasonable passenger
comfort. For normal operating condi-
tions, the ventilation system must be
designed to provide each occupant with
an airflow containing at least 0.55
pounds of fresh air per minute.

(b) Crew and passenger compartment

air must be free from harmful or haz-
ardous concentrations of gases or va-
pors. In meeting this requirement, the
following apply:

(1) Carbon monoxide concentrations

in excess of 1 part in 20,000 parts of air
are considered hazardous. For test pur-
poses, any acceptable carbon monoxide
detection method may be used.

(2) Carbon dioxide concentration dur-

ing flight must be shown not to exceed
0.5 percent by volume (sea level equiva-
lent) in compartments normally occu-
pied by passengers or crewmembers.

ensure that the conditions prescribed
in paragraph (b) of this section are met
after reasonably probable failures or
malfunctioning of the ventilating,
heating, pressurization, or other sys-
tems and equipment.

(d) If accumulation of hazardous

quantities of smoke in the cockpit area
is reasonably probable, smoke evacu-
ation must be readily accomplished,
starting with full pressurization and
without depressurizing beyond safe
limits.

(e) Except as provided in paragraph

(f) of this section, means must be pro-
vided to enable the occupants of the
following compartments and areas to
control the temperature and quantity
of ventilating air supplied to their
compartment or area independently of
the temperature and quantity of air