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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 .......................................

1

12 15 

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

12 

20 

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

15 

20 

1

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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