spaschal on DSK3GDR082PROD with CFR

Federal Aviation Administration, DOT

Section 25.783

(6) It must not be possible to unlatch
the latches with the locks in the
locked position. Locks must be designed to withstand the limit loads resulting from - 
(i) The maximum operator effort
when the latches are operated manually;
(ii) The powered latch actuators, if
installed; and
(iii) The relative motion between the
latch and the structural counterpart.
(7) Each door for which unlatching
would not result in a hazard is not required to have a locking mechanism
meeting the requirements of paragraphs (d)(3) through (d)(6) of this section.
(e) Warning, caution, and advisory indications. Doors must be provided with
the following indications:
(1) There must be a positive means to
indicate at each door operator-s station
that all required operations to close,
latch, and lock the door(s) have been
completed.
(2) There must be a positive means
clearly visible from each operator station for any door that could be a hazard if unlatched to indicate if the door
is not fully closed, latched, and locked.
(3) There must be a visual means on
the flight deck to signal the pilots if
any door is not fully closed, latched,
and locked. The means must be designed such that any failure or combination of failures that would result
in an erroneous closed, latched, and
locked indication is improbable for - 
(i) Each door that is subject to pressurization and for which the initial
opening movement is not inward; or
(ii) Each door that could be a hazard
if unlatched.
(4) There must be an aural warning
to the pilots prior to or during the initial portion of takeoff roll if any door
is not fully closed, latched, and locked,
and its opening would prevent a safe
takeoff and return to landing.
(f) Visual inspection provision. Each
door for which unlatching of the door
could be a hazard must have a provision for direct visual inspection to determine, without ambiguity, if the
door is fully closed, latched, and
locked. The provision must be permanent and discernible under operational

lighting conditions, or by means of a
flashlight or equivalent light source.
(g) Certain maintenance doors, removable emergency exits, and access panels.
Some doors not normally opened except for maintenance purposes or emergency evacuation and some access panels need not comply with certain paragraphs of this section as follows:
(1) Access panels that are not subject
to cabin pressurization and would not
be a hazard if open during flight need
not comply with paragraphs (a)
through (f) of this section, but must
have a means to prevent inadvertent
opening during flight.
(2) Inward-opening removable emergency exits that are not normally removed, except for maintenance purposes or emergency evacuation, and
flight deck-openable windows need not
comply with paragraphs (c) and (f) of
this section.
(3) Maintenance doors that meet the
conditions of paragraph (h) of this section, and for which a placard is provided limiting use to maintenance access, need not comply with paragraphs
(c) and (f) of this section.
(h) Doors that are not a hazard. For
the purposes of this section, a door is
considered not to be a hazard in the unlatched condition during flight, provided it can be shown to meet all of the
following conditions:
(1) Doors in pressurized compartments would remain in the fully closed
position if not restrained by the
latches when subject to a pressure
greater than 1-2 psi. Opening by persons,
either inadvertently or intentionally,
need not be considered in making this
determination.
(2) The door would remain inside the
airplane or remain attached to the airplane if it opens either in pressurized
or unpressurized portions of the flight.
This determination must include the
consideration of inadvertent and intentional opening by persons during either
pressurized or unpressurized portions
of the flight.
(3) The disengagement of the latches
during flight would not allow depressurization of the cabin to an unsafe
level. This safety assessment must include the physiological effects on the
occupants.

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