Sec. 25.810 - Emergency egress assist means and
(a) Each non over-wing Type A, Type B or
Type C exit, and any other non over-wing landplane emergency exit more
than 6 feet from the ground with the airplane on the ground and the
landing gear extended, must have an approved means to assist the occupants
in descending to the ground.
(1) The assisting means for each
passenger emergency exit must be a self-supporting slide or equivalent;
and, in the case of Type A or Type B exits, it must be capable of carrying
simultaneously two parallel lines of evacuees. In addition, the assisting
means must be designed to meet the following requirements --
(i) It must be automatically deployed
and deployment must begin during the interval between the time the exit
opening means is actuated from inside the airplane and the time the exit
is fully opened. However, each passenger emergency exit which is also a
passenger entrance door or a service door must be provided with means to
prevent deployment of the assisting means when it is opened from either
the inside or the outside under nonemergency conditions for normal use.
(ii) Except for assisting means
installed at Type C exits, it must be automatically erected within 6
seconds after deployment is begun. Assisting means installed at Type C
exits must be automatically erected within 10 seconds from the time the
opening means of the exit is actuated.
(iii) It must be of such length after
full deployment that the lower end is self-supporting on the ground and
provides safe evacuation of occupants to the ground after collapse of one
or more legs of the landing gear.
(iv) It must have the capability, in
25-knot winds directed from the most critical angle, to deploy and, with
the assistance of only one person, to remain usable after full deployment
to evacuate occupants safely to the ground.
(v) For each system installation (mockup
or airplane installed), five consecutive deployment and inflation tests
must be conducted (per exit) without failure, and at least three tests of
each such five-test series must be conducted using a single representative
sample of the device. The sample devices must be deployed and inflated by
the system's primary means after being subjected to the inertia forces
specified in §25.561(b). If any part of the system fails or does not
function properly during the required tests, the cause of the failure or
malfunction must be corrected by positive means and after that, the full
series of five consecutive deployment and inflation tests must be
conducted without failure.
(2) The assisting means for flightcrew
emergency exits may be a rope or any other means demonstrated to be
suitable for the purpose. If the assisting means is a rope, or an approved
device equivalent to a rope, it must be --
(i) Attached to the fuselage structure
at or above the top of the emergency exit opening, or, for a device at a
pilot's emergency exit window, at another approved location if the stowed
device, or its attachment, would reduce the pilot's view in flight;
(ii) Able (with its attachment) to
withstand a 400-pound static load.
(b) Assist means from the cabin to the
wing are required for each type A or Type B exit located above the wing
and having a stepdown unless the exit without an assist-means can be shown
to have a rate of passenger egress at least equal to that of the same type
of non over-wing exit. If an assist means is required, it must be
automatically deployed and automatically erected concurrent with the
opening of the exit. In the case of assist means installed at Type C
exits, it must be self-supporting within 10 seconds from the time the
opening means of the exits is actuated. For all other exit types, it must
be self-supporting 6 seconds after deployment is begun.
(c) An escape route must be established
from each overwing emergency exit, and (except for flap surfaces suitable
as slides) covered with a slip resistant surface. Except where a means for
channeling the flow of evacuees is provided --
(1) The escape route from each Type A or
Type B passenger emergency exit, or any common escape route from two Type
III passenger emergency exits, must be at least 42 inches wide; that from
any other passenger emergency exit must be at least 24 inches wide; and
(2) The escape route surface must have a
reflectance of at least 80 percent, and must be defined by markings with a
surface-to-marking contrast ratio of at least 5:1.
(d) Means must be provided to assist
evacuees to reach the ground for all Type C exits located over the wing
and, if the place on the airplane structure at which the escape route
required in paragraph (c) of this section terminates is more than 6 feet
from the ground with the airplane on the ground and the landing gear
extended, for all other exit types.
(1) If the escape route is over the
flap, the height of the terminal edge must be measured with the flap in
the takeoff or landing position, whichever is higher from the ground.
(2) The assisting means must be usable
and self-supporting with one or more landing gear legs collapsed and under
a 25-knot wind directed from the most critical angle.
(3) The assisting means provided for
each escape route leading from a Type A or B emergency exit must be
capable of carrying simultaneously two parallel lines of evacuees; and,
the assisting means leading from any other exit type must be capable of
carrying as many parallel lines of evacuees as there are required escape
(4) The assisting means provided for
each escape route leading from a Type C exit must be automatically erected
within 10 seconds from the time the opening means of the exit is actuated,
and that provided for the escape route leading from any other exit type
must be automatically erected within 10 seconds after actuation of the
[Amdt. 25-72, 55 FR 29782, July 20, 1990, as
amended by Amdt. 25-88, 61 FR 57958, Nov. 8, 1996; 62 FR 1817, Jan. 13,