Document ID: FAA-2019-0427-0002
Agency: faa
Document Type: Rule
Title: Special Conditions: TTF Aerospace, LLC, Airbus Model A330-300 and Model A330-900 Series Airplanes; Bulk Cargo LowerDeck Crew Rest Compartments
Posted Date: 2019-07-11T04:00Z

[Federal Register Volume 84, Number 133 (Thursday, July 11, 2019)]
[Rules and Regulations]
[Pages 32975-32980]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2019-14784]

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 Rules and Regulations
                                                 Federal Register
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  Federal Register / Vol. 84, No. 133 / Thursday, July 11, 2019 / Rules 
and Regulations  

[[Page 32975]]

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 25

[Docket No. FAA-2019-0427; Special Conditions No. 25-752-SC]

Special Conditions: TTF Aerospace, LLC, Airbus Model A330-300 and 
Model A330-900 Series Airplanes; Bulk Cargo Lower Deck Crew Rest 
Compartments

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final special conditions.

-----------------------------------------------------------------------

SUMMARY: These special conditions are issued for the Airbus Model A330-
300 and Model A330-900 series airplanes. These airplanes, as modified 
by TTF Aerospace, LLC (TTF Aerospace), will have a novel or unusual 
design feature when compared to the state of technology envisioned in 
the airworthiness standards for transport category airplanes. This 
design feature is a lower deck mobile crew rest (LD-MCR) compartment 
installed in the aft cargo compartment of Model A330–300 and 
Model A330-900 series airplanes. The applicable airworthiness 
regulations do not contain adequate or appropriate safety standards for 
this design feature. These special conditions contain the additional 
safety standards that the Administrator considers necessary to 
establish a level of safety equivalent to that established by the 
existing airworthiness standards.

DATES: Effective July 11, 2019.

FOR FURTHER INFORMATION CONTACT: Alan Sinclair, Airframe & Cabin Safety 
Section, AIR-675, Transport Standards Branch, Policy and Innovation 
Division, Aircraft Certification Service, Federal Aviation 
Administration, 2200 South 216th Street, Des Moines, Washington 98198; 
telephone and fax 206-231-3215; email alan.sinclair@faa.gov.

SUPPLEMENTARY INFORMATION:

Background

    On February 20, 2019, TTF Aerospace applied for a supplemental type 
certificate for a LD-MCR installed in the aft cargo compartment of 
Airbus Model A330-300 and Model A330-900 series airplanes. The Airbus 
Model A330-300 and Model A330-900 series airplanes are twin engine, 
transport category airplanes with maximum takeoff weights of 405,650 
and 533,518 pounds, respectively, and seating for 440 passengers.
    The LD-MCR compartment will be located under the passenger cabin 
floor in the aft cargo compartment of Airbus Model A330-300 and Model 
A330-900 airplanes. It will be removable from the cargo compartment. 
The LD-MCR compartment will be occupied in flight but not during taxi, 
takeoff, or landing. No more than ten crewmembers at a time will be 
permitted to occupy it. The LD-MCR compartment will have a smoke 
detection system, a fire suppression system, and an oxygen system.
    The LD-MCR compartment will be accessed from the main deck via a 
``stairhouse.'' The floor within the stairhouse has a hatch that leads 
to stairs that occupants use to descend into the LD-MCR compartment. An 
interface will keep this hatch open when the stairhouse door is open. 
In addition, there will be an emergency hatch that opens directly into 
the main passenger cabin. The LD-MCR compartment has a maintenance 
door. This door is intended to be used to allow maintenance personnel 
and cargo handlers to enter the LD-MCR from the cargo compartment when 
the airplane is not in flight.

Type Certification Basis

    Under the provisions of title 14, Code of Federal Regulations (14 
CFR) 21.101, TTF Aerospace must show that the Airbus Model A330-300 and 
Model A330-900 series airplanes, as changed, continue to meet the 
applicable provisions of the regulations listed in Type Certificate No. 
A46NM or the applicable regulations in effect on the date of 
application for the change, except for earlier amendments as agreed 
upon by the FAA.
    If the Administrator finds that the applicable airworthiness 
regulations (i.e., 14 CFR part 25) do not contain adequate or 
appropriate safety standards for the Airbus Model A330-300 and Model 
A330-900 series airplanes because of a novel or unusual design feature, 
special conditions are prescribed under the provisions of Sec.  21.16.
    Special conditions are initially applicable to the model for which 
they are issued. Should the applicant apply for a supplemental type 
certificate to modify any other model included on the same type 
certificate to incorporate the same novel or unusual design feature, 
these special conditions would also apply to the other model under 
Sec.  21.101.
    In addition to the applicable airworthiness regulations and special 
conditions, the Airbus Model A330-300 and Model A330-900 series 
airplanes must comply with the fuel vent and exhaust emission 
requirements of 14 CFR part 34 and the noise certification requirements 
of 14 CFR part 36.
    The FAA issues special conditions, as defined in 14 CFR 11.19, in 
accordance with Sec.  11.38, and they become part of the type 
certification basis under Sec.  21.101.

Novel or Unusual Design Features

    The Airbus Model A330-300 and Model A330-900 series airplanes will 
incorporate the following novel or unusual design features:
    This design feature is a LD-MCR compartment installed in the aft 
cargo compartment of Airbus Model A330 300 and Model A330-900 series 
airplanes.

Discussion

    While the installation of the crew rest compartment is not a new 
concept for large transport category airplanes, each crew rest 
compartment has unique features based on design, location, and use on 
the airplane. The LD-MCR compartment is novel in terms of part 25 of 
title 14 of the CFR in that it will be located under the passenger 
cabin floor in the aft cargo compartment of Airbus Model A330-300 and 
Model A330-900 series airplanes, which is not contemplated by Sec.  
25.819 regarding lower deck service compartments (including galleys). 
Due to the novel or unusual features associated with the installation 
of a LD-MCR compartment, special conditions are considered necessary to 
provide a level of safety equal to that established by the 
airworthiness regulations incorporated by reference in the type 
certificates of these airplanes, as applicable

[[Page 32976]]

airworthiness regulations do not contain adequate or appropriate safety 
standards for this design feature.
    Most of these special conditions come from Sec.  25.819, but they 
require more stringent standards for fire protection and emergency 
egress because of design features and location of the LD-MCR. The 
applicant should note that the FAA considers smoke or fire detection 
and fire suppression systems (including airflow management features 
that prevent hazardous quantities of smoke or fire extinguishing agent 
from entering any other compartment occupied by crewmembers or 
passengers) for crew rest compartments complex in terms of paragraph 6d 
of Advisory Circular (AC) 25.1309-1A, ``System Design and Analysis,'' 
dated June 21, 1988. In addition, the FAA considers failure of the crew 
rest compartment fire protection system (i.e., smoke or fire detection 
and fire suppression systems) in conjunction with a crew rest fire to 
be a catastrophic event. Based on the ``Depth of Analysis Flowchart'' 
shown in Figure 2 of AC 25.1309-1A, the depth of analysis should 
include both qualitative and quantitative assessments. Refer to 
paragraphs 8d, 9, and 10 of AC 25.1309-1A. Note that flammable fluids, 
explosives, or other dangerous cargo are prohibited from being carried 
in the crew rest areas.
    The requirements to enable crewmembers' quick entry to the crew 
rest compartment, and to locate a fire source, inherently places limits 
on the amount of baggage that may be carried and the size of the crew 
rest area. The FAA considers that the crew rest area must be limited to 
the stowage of crew personal luggage and both must not be used for the 
stowage of cargo or passenger baggage. The design of such a system to 
include cargo or passenger baggage would require additional 
requirements to ensure safe operation.
    Furthermore, the addition of galley equipment, or a kitchenette 
incorporating a heat source (e.g., cook tops, microwaves, coffee pots, 
etc.), other than a conventional lavatory or kitchenette hot water 
heater, within the LD-MCR compartment defined in the ``Novel or Unusual 
Design Features'' section, may require additional special conditions to 
be considered. A hot water heater is acceptable without further special 
conditions consideration.
    Finally, amendment 25-38 modified the requirements of Sec.  
25.1439(a) by adding, ``In addition, protective breathing equipment 
must be installed in each isolated separate compartment in the 
airplane, including upper and lower lobe galleys, in which crewmember 
occupancy is permitted during flight for the maximum number of 
crewmembers expected to be in the area during any operation.'' The LD-
MCR compartment is an isolated separate compartment, so Sec.  
25.1439(a) is applicable. However, the Sec.  25.1439(a) protective 
breathing equipment (PBE) requirements for isolated separate 
compartments are not appropriate because the LD-MCR compartment is 
novel or unusual in terms of the number of occupants.
    In 1976, when amendment 25-38 was adopted, small galleys were the 
only isolated compartments that had been certificated. Two crewmembers 
were the maximum expected to occupy those galleys.
    This crew rest compartment can accommodate up to ten crewmembers. 
This large number of occupants in an isolated compartment was not 
envisioned at the time amendment 25-38 was adopted. It is not 
appropriate for all occupants to don PBEs in the event of a fire 
because the first action should be to leave the confined space unless 
the occupant is fighting the fire. Taking the time to don the PBE would 
prolong the time for the emergency evacuation of the occupants and 
possibly interfere with efforts to extinguish the fire. These special 
conditions therefore provide procedures that establish a level of 
safety equivalent to the PBE requirements.

Operational Evaluations and Approval

    These special conditions outline requirements for flightcrew and 
cabin crew rest compartment design approvals (e.g., type design change 
or supplemental type certificate) administered by the FAA's Aircraft 
Certification Service. Prior to operational use of a flight (cabin) 
crew rest compartment, the FAA's Flight Standards Service must 
evaluate, for operational suitability the flight (cabin) crew sleeping 
quarters and rest facilities. Refer to Sec. Sec.  91.1061(b)(1), 
121.485(a), 121.523(b), and 135.269(b)(5).
    Compliance with these special conditions does not ensure that the 
applicant has demonstrated compliance with the requirements of 14 CFR 
part 91, 121, or 135.
    To obtain an operational evaluation, the type design holder must 
contact the appropriate Aircraft Evaluation Group (AEG) in the Flight 
Standards Service and request an evaluation for operational suitability 
of the flightcrew sleeping quarters in their crew rest facility. 
Results of these evaluations should be documented and appended to the 
applicable Flight Standardization Board Report. Individual operators 
may reference these standardized evaluations in discussions with their 
FAA Principal Operating Inspector as the basis for an operational 
approval, in lieu of an on-site operational evaluation.
    Any changes to the approved flight (cabin) crew rest compartment 
configuration that affect crewmember emergency egress or any other 
procedures affecting the safety of the occupying crewmembers and/or 
related training shall require a re-evaluation and approval. In the 
event of any design change that affects egress, safety procedures, or 
training, the applicant is responsible for notifying the FAA's AEG that 
a new crew rest facility evaluation is required.
    All instructions for continued airworthiness (ICAs) will be 
submitted to the Seattle AEG for approval acceptance, including service 
bulletins, before issuance of the FAA modification approval.
    These special conditions are the same as Special Conditions 25-281-
SC, except the maximum occupancy is ten rather than seven occupants, 
and a change to the table in Special Condition 20. The conditions 
provide an appropriate level of safety for the occupancy limit as only 
the size of the compartment will increase to accommodate the additional 
occupants, but all other requirements for safety, fire suppression, and 
emergency evacuation will remain the same. In addition, the change to 
the table in Special Condition 20 is related to the location of the 
crew rest and specifics of the crew rest design. Stowage compartments 
located in the vicinity of critical equipment or located in an overhead 
area would typically be listed as conditional. However, this LD-MCR 
compartment is located in the Class C cargo compartment with all of its 
features that provide fire protection (e.g., the use of liner material 
that meets appendix F to part 25, part III; control of ventilation; 
active fire suppression; active fire detection; etc.). These features 
remain when the crew rest is installed.
    These special conditions contain the additional safety standards 
that the Administrator considers necessary to establish a level of 
safety equivalent to that established by the existing airworthiness 
standards.

Discussion of Comments

    The FAA issued Notice of Proposed Special Conditions No. 25-19-07-
SC for the Airbus Model A330-300 and Model A330-900 series airplane, 
which was published in the Federal Register on June 7, 2019 (84 FR 
26593). No comments were received, and the

[[Page 32977]]

special conditions are adopted as proposed.

Applicability

    As discussed above, these special conditions are applicable to the 
Airbus Model A330-300 and Model A330-900 airplanes. Should TTF 
Aerospace apply at a later date for a supplemental type certificate to 
modify any other model included on Type Certificate No. A46NM to 
incorporate the same novel or unusual design feature, these special 
conditions would apply to that model as well.
    Under standard practice, the effective date of final special 
conditions would be 30 days after the date of publication in the 
Federal Register. However, as the certification date for the LD-MCR 
compartment is currently scheduled for July 2019 for the Airbus Model 
A330-300 and Model A330-900 airplanes is imminent, the FAA finds that 
good cause exists to make these special conditions effective upon 
publication.

Conclusion

    This action affects only a certain novel or unusual design feature 
on Airbus Model A330-300 and Model A330-900 of airplanes as modified by 
TTF Aerospace. It is not a rule of general applicability and affects 
only the applicant who applied to the FAA for approval of these 
features on the airplane.

List of Subjects in 14 CFR Part 25

    Aircraft, Aviation safety, Reporting and recordkeeping 
requirements.

Authority Citation

    The authority citation for these special conditions is as follows:

    Authority: 49 U.S.C. 106(f), 106(g), 40113, 44701, 44702, 44704.

The Special Conditions

0
Accordingly, pursuant to the authority delegated to me by the 
Administrator, the following special conditions are issued as part of 
the type certification basis for Airbus Model A330-300 and Model A330-
900 airplanes, as modified by TTF Aerospace.
    1. Occupancy of the LD-MCR compartment is limited to the total 
number of installed bunks and seats in each compartment. For each 
occupant permitted in the LD-MCR compartment, there must be an approved 
seat or berth able to withstand the maximum flight loads when occupied. 
The maximum occupancy in the LD-MCR compartment is ten.
    a. There must be appropriate placards displayed in a conspicuous 
place at each entrance to the LD-MCR compartment indicating the 
following information:
    (1) The maximum number of occupants allowed;
    (2) That occupancy is restricted to crewmembers trained in the 
evacuation procedures for the LD-MCR compartment;
    (3) That occupancy is prohibited during taxi, takeoff and landing;
    (4) That smoking is prohibited in the LD-MCR compartment; and
    (5) That the LD-MCR compartment is limited to the stowage of 
personal luggage of crewmembers and must not be used for the stowage of 
cargo or passenger baggage.
    b. There must be at least one ashtray located conspicuously on or 
near the entry side of any entrance to the LD-MCR compartment.
    c. There must be a means to prevent passengers from entering the 
LD-MCR compartment in an emergency or when no flight attendant is 
present.
    d. There must be a means for any door installed between the LD-MCR 
compartment and the passenger cabin to be capable of being quickly 
opened from inside the LD-MCR compartment, even when crowding occurs at 
each side of the door.
    e. For all doors installed in the evacuation routes, there must be 
a means to preclude anyone from being trapped inside a compartment. If 
a locking mechanism is installed, it must be capable of being unlocked 
from the outside without the aid of special tools. The lock must not 
prevent opening from the inside of a compartment at any time.
    2. There must be at least two emergency evacuation routes, which 
could be used by each occupant of the LD-MCR compartment to rapidly 
evacuate to the main cabin and could be closed from the main passenger 
cabin after evacuation.
    a. The routes must be located with one at each end of the LD-MCR 
compartment or with two having sufficient separation within the LD-MCR 
compartment and between the routes to minimize the possibility of an 
event (either inside or outside of the LD-MCR compartment) rendering 
both routes inoperative.
    b. The routes must be designed to minimize the possibility of 
blockage, which might result from fire, mechanical or structural 
failure, or from persons standing on top of or against the escape 
route. If an evacuation route utilizes an area where normal movement of 
passengers occurs, it must be demonstrated that passengers would not 
impede egress to the main deck. If a hatch is installed in an 
evacuation route, the point at which the evacuation route terminates in 
the passenger cabin should not be located where normal movement by 
passengers or crew occur, such as in a main aisle, cross aisle, 
passageway, or galley complex.
    If such a location cannot be avoided, special consideration must be 
taken to ensure that the hatch or door can be opened when a person who 
is the weight of a ninety-fifth percentile male is standing on the 
hatch or door.
    The use of evacuation routes must not be dependent on any powered 
device. If there is low headroom at or near an evacuation route, 
provision must be made to prevent or to protect occupants of the LD-MCR 
compartment from head injury.
    c. Emergency evacuation procedures, including the emergency 
evacuation of an incapacitated crewmember from the LD-MCR compartment, 
must be established. All of these procedures must be transmitted to the 
operator for incorporation into its training programs and appropriate 
operational manuals.
    d. There must be a limitation in the Airplane Flight Manual or 
other suitable means requiring that crewmembers be trained in the use 
of evacuation routes.
    3. There must be a means for the evacuation of an incapacitated 
crewmember who is representative of a 95th percentile male from the LD-
MCR compartment to the passenger cabin floor. The evacuation must be 
demonstrated for all evacuation routes. A flight attendant or other 
crewmember (a total of one assistant within the LD-MCR compartment) may 
provide assistance in the evacuation. Additional assistance may be 
provided by up to three persons in the main passenger compartment. For 
evacuation routes having stairways, the additional assistants may 
descend down to one half the elevation change from the main deck to the 
LD-MCR compartment or to the first landing, whichever is higher.
    4. The following signs and placards must be provided in the LD-MCR 
compartment:
    a. At least one exit sign that meets the requirements of Sec.  
25.812(b)(1)(i) at amendment 25-58 must be located near each exit. 
However, a sign with reduced background area of no less than 5.3 square 
inches (excluding the letters) may be utilized, provided that it is 
installed such that the material surrounding the exit sign is light in 
color (e.g., white, cream, light beige). If the material surrounding 
the exit sign is not light in color, a sign with a minimum of a one-
inch wide background border around the letters would also be 
acceptable;
    b. An appropriate placard that defines the location and the 
operating

[[Page 32978]]

instructions for each evacuation route must be located near each exit;
    c. Placards must be readable from a distance of 30 inches under 
emergency lighting conditions; and
    d. The exit handles and the placards with the evacuation path 
operating instructions must be illuminated to at least 160 
microlamberts under emergency lighting conditions.
    5. There must be a means for emergency illumination to be 
automatically provided for the LD-MCR compartment in the event of 
failure of the main power system of the airplane or of the normal 
lighting system of the LD-MCR compartment.
    a. This emergency illumination must be independent of the main 
lighting system.
    b. The sources of general cabin illumination may be common to both 
the emergency and the main lighting systems, if the power supply to the 
emergency lighting system is independent of the power supply to the 
main lighting system.
    c. The illumination level must be sufficient for the occupants of 
the LD-MCR compartment to locate and transfer to the main passenger 
cabin floor by means of each evacuation route.
    d. The illumination level must be sufficient to locate a deployed 
oxygen mask with the privacy curtains in the closed position for each 
occupant of the LD-MCR compartment.
    6. There must be means for two-way voice communications between 
crewmembers on the flightdeck and crewmembers in the LD-MCR 
compartment. Section 25.785(h) at amendment 25-51 requires flight 
attendant seats near required floor level emergency exits. Each such 
exit seat on the aircraft must have a public address system microphone 
that allows two-way voice communications between flight attendants and 
crewmembers in the LD-MCR compartment. One microphone may serve more 
than one such exit seat, provided the proximity of the exits allows 
unassisted verbal communications between seated flight attendants.
    7. There must be a means for manual activation of an aural 
emergency alarm system, audible during normal and emergency conditions, 
to enable crewmembers on the flightdeck and at each pair of required 
floor-level emergency exits to alert crewmembers in the LD-MCR 
compartment of an emergency. Use of a public address or crew interphone 
system will be acceptable, provided an adequate means of 
differentiating between normal and emergency communications is 
incorporated. The system must be powered in flight for at least ten 
minutes after the shutdown or failure of all engines and auxiliary 
power units (APU) or the disconnection or failure of all power sources 
that are dependent on the continued operation of the engines and APUs.
    8. There must be a means, readily detectable by seated or standing 
occupants of the LD-MCR compartment, which indicates when seat belts 
should be fastened. If there are no seats, at least one means, such as 
sufficient handholds, must be provided to cover anticipated turbulence. 
Seat belt-type restraints must be provided for berths and must be 
compatible with the sleeping attitude during cruise conditions. There 
must be a placard on each berth indicating that seat belts must be 
fastened when the berth is occupied. If compliance with any of the 
other requirements of these special conditions is predicated on 
specific head location, there must be a placard specifying the head 
position.
    9. To provide a level of safety equivalent to that provided to 
occupants of a small isolated galley, in lieu of the requirements of 
Sec.  25.1439(a) at amendment 25-38 that pertain to isolated 
compartments, the following equipment must be provided in the LD-MCR 
compartment:
    a. At least one approved hand-held fire extinguisher appropriate 
for the kinds of fires likely to occur;
    b. Two portable Protective Breathing Equipment (PBE) units, 
approved to Technical Standard Order TSO-C116 or equivalent, which are 
suitable for fire-fighting, or one PBE for each hand-held fire 
extinguisher, whichever is greater; and
    c. One flashlight.

    Note: Additional PBEs and fire extinguishers in specific 
locations, beyond the minimum numbers prescribed in Special 
Condition 9, may be required as a result of any egress analysis 
accomplished to satisfy Special Condition 2(a).

    10. A smoke or fire detection system or systems must be provided to 
monitor each occupiable area within the LD-MCR compartment, including 
those areas partitioned by curtains. Flight tests must be conducted to 
show compliance with this requirement. Each smoke or fire detection 
system must provide the following:
    a. A visual indication to the flightdeck within one minute after 
the start of a fire;
    b. An aural warning in the LD-MCR compartment; and
    c. A warning in the main passenger cabin. This warning must be 
readily detectable by a flight attendant, taking into consideration the 
positioning of flight attendants throughout the main- passenger 
compartment during various phases of flight.
    11. The LD-MCR compartment must be designed such that fires within 
it can be controlled without a crewmember having to enter the 
compartment or be designed such that crewmembers equipped for fire-
fighting have unrestricted access to the compartment. The time for a 
crewmember on the main deck to react to the fire alarm, don the fire-
fighting equipment, and gain access must not exceed the time for the 
compartment to become smoke-filled, making it difficult to locate the 
source of the fire.
    12. There must be a means provided to exclude hazardous quantities 
of smoke or extinguishing agent originating in the LD-MCR compartment 
from entering any other compartment occupied by crewmembers or 
passengers. This means must include the time periods during the 
evacuation of the LD-MCR compartment and, if applicable, when accessing 
the LD-MCR compartment to manually fight a fire. Smoke entering any 
other compartment occupied by crewmembers or passengers when the LD-MCR 
compartment is opened during an emergency evacuation must dissipate 
within five minutes after the LD-MCR compartment is closed.
    Hazardous quantities of smoke may not enter any other compartment 
occupied by crewmembers or passengers during subsequent access to 
manually fight a fire in the LD-MCR compartment. (The amount of smoke 
entrained by a firefighter exiting the LD-MCR compartment through the 
access is not considered hazardous.)
    During the one-minute smoke detection time, penetration of a small 
quantity of smoke from the LD-MCR compartment into an occupied area is 
acceptable. Flight tests must be conducted to show compliance with this 
requirement.
    If a built-in fire suppression system is used in lieu of manual 
firefighting, the fire suppression system must be designed so that no 
hazardous quantities of extinguishing agent will enter other 
compartments occupied by passengers or crewmembers. The system must 
have adequate capacity to suppress any likely fire occurring in the LD-
MCR compartment, considering the fire threat, the volume of the 
compartment and the ventilation rate.
    13. For each seat and berth in the LD-MCR compartment, there must 
be a supplemental oxygen system equivalent to that provided for main 
deck passengers. The system must provide an

[[Page 32979]]

aural and visual warning to alert the occupants of the LD-MCR 
compartment of the need to don oxygen masks in the event of 
decompression. The warning must activate before the cabin pressure 
altitude exceeds 15,000 feet. The aural warning must sound continuously 
for a minimum of five minutes or until a reset push button in the LD-
MCR compartment is depressed. Procedures for crewmembers in the LD-MCR 
compartment to follow in the event of decompression must be 
established. These procedures must be transmitted to the operator for 
incorporation into their training programs and appropriate operational 
manuals.
    14. The following requirements apply to LD-MCR compartments that 
are divided into several sections by the installation of curtains or 
doors:
    a. To warn crewmembers who may be sleeping, there must be an aural 
alert that accompanies automatic presentation of supplemental oxygen 
masks. The alert must be able to be heard in each section of the LD-MCR 
compartment. A visual indicator that occupants must don an oxygen mask 
is required in each section where seats or berths are not installed. A 
minimum of two supplemental oxygen masks are required for each seat or 
berth. There must also be a means to manually deploy the oxygen masks 
from the flightdeck.
    b. A placard is required adjacent to each curtain that visually 
divides or separates the LD-MCR compartment into small sections for 
privacy purposes. The placard must indicate that the curtain is to 
remain open when the private section it creates is unoccupied.
    c. For each section created by the installation of a curtain, the 
following requirements of these special conditions must be met both 
with the curtain open and with the curtain closed:
    (1) Emergency illumination (Special Condition 5);
    (2) Aural emergency alarm (Special Condition 7);
    (3) Fasten seat belt signal or return to seat signal as applicable 
(Special Condition 8); and
    (4) Smoke or fire detection (Special Condition 10).
    d. Crew rest compartments visually divided to the extent that 
evacuation could be affected must have exit signs that direct occupants 
to the primary stairway exit. The exit signs must be provided in each 
separate section of the LD-MCR compartment and must meet the 
requirements of Sec.  25.812(b)(1)(i) at amendment 25-58. An exit sign 
with reduced background area, as described in Special Condition 4(a), 
may be used to meet this requirement.
    e. For sections within a LD-MCR compartment that are created by the 
installation of a partition with a door separating the sections, the 
following requirements of these special conditions must be met with the 
door open and with the door closed:
    (1) There must be a secondary evacuation route from each section to 
the main deck, or it must be shown that any door between the sections 
has been designed to preclude anyone from being trapped inside the 
compartment. Removal of an incapacitated crewmember from this area must 
be considered. A secondary evacuation route from a small room designed 
for only one occupant for a short period of time, such as a changing 
area or lavatory, is not required. However, removal of an incapacitated 
occupant from this area must be considered.
    (2) Any door between the sections must be shown to be openable when 
crowded against, even when crowding occurs at each side of the door.
    (3) There may be no more than one door between any seat or berth 
and the primary stairway exit.
    (4) There must be exit signs in each section that meet the 
requirements of Sec.  25.812(b)(1)(i) at amendment 25-58, that direct 
occupants to the primary stairway exit. An exit sign with reduced 
background area, as described in Special Condition 4(a), may be used to 
meet this requirement.
    (5) Special Conditions 5 (emergency illumination), 7 (aural 
emergency alarm), 8 (fasten seat belt signal or return to seat signal 
as applicable) and 10 (smoke and fire detection) must be met both with 
the door open and the door closed.
    (6) Special Conditions 6 (two-way voice communication) and 9 (PBE 
and other equipment) must be met independently for each separate 
section, except in lavatories or other small areas that are not 
intended to be occupied for extended periods of time.
    15. Where a waste disposal receptacle is fitted, it must be 
equipped with a built-in fire extinguisher designed to discharge 
automatically upon occurrence of a fire in the receptacle.
    16. Materials, including finishes or decorative surfaces applied to 
the materials, must comply with the flammability standards of Sec.  
25.853 at amendment 25-66. Mattresses must comply with the flammability 
standards of Sec.  25.853(b) and (c) at amendment 25-66.
    17. A lavatory within the LD-MCR compartment must meet the same 
requirements as a lavatory installed on the main deck, except with 
regard to Special Condition 10 for smoke detection.
    18. When a LD-MCR compartment is installed or enclosed as a 
removable module in part of a cargo compartment, or is located directly 
adjacent to a cargo compartment without an intervening cargo 
compartment wall, the following conditions apply:
    a. Any wall of the LD-MCR compartment, which forms part of the 
boundary of the reduced cargo compartment and is subject to direct 
flame impingement from a fire in the cargo compartment, and any 
interface item between the LD-MCR compartment and the airplane 
structure or systems must meet the applicable requirements of Sec.  
25.855 at amendment 25-60.
    b. Means must be provided to ensure that the fire protection level 
of the cargo compartment meets the applicable requirements of 
Sec. Sec.  25.855 at amendment 25-60; 25.857 at amendment 25-60; and 
25.858 at amendment 25-54 when the LD-MCR compartment is not installed.
    c. Use of each emergency evacuation route must not require 
occupants of the LD-MCR compartment to enter the cargo compartment in 
order to return to the passenger compartment.
    d. The aural emergency alarm specified in Special Condition 7 must 
sound in the LD-MCR compartment in the event of a fire in the cargo 
compartment.
    19. Means must be provided to prevent access into the Class C cargo 
compartment, whether or not the LD-MCR compartment is installed, during 
all airplane flight operations, and to ensure that the maintenance door 
is closed and secured during all airplane flight operations.
    20. All enclosed stowage compartments within the LD-MCR compartment 
that are not limited to stowage of emergency equipment or airplane 
supplied equipment (i.e., bedding), must meet the design criteria given 
in the table below. As indicated in the table, enclosed stowage 
compartments larger than 200 ft\3\ in interior volume are not addressed 
by these Special Conditions. The in-flight accessibility of very large 
enclosed stowage compartments, and the subsequent impact on the 
crewmembers' ability to effectively reach any part of the compartment 
with the contents of a hand fire extinguisher will require additional 
fire protection considerations similar to those required for 
inaccessible compartments such as Class C cargo compartments.

[[Page 32980]]

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                                                      Stowage compartment interior volumes
   Fire protection features    ---------------------------------------------------------------------------------
                                    Less than 25 ft\3\         25 ft\3\ to 57 ft\3\      57 ft\3\ to 200 ft\3\
----------------------------------------------------------------------------------------------------------------
Materials of Construction \1\.  Yes.......................  Yes......................  Yes.
Detectors \2\.................  No........................  Yes......................  Yes.
Liner \3\.....................  No........................  No.......................  Yes.
Location Detector \4\.........  No........................  Yes......................  Yes.
----------------------------------------------------------------------------------------------------------------
\1\ Material: The material used to construct each enclosed stowage compartment must at least be fire resistant
  and must meet the flammability standards established for interior components per the requirements of Sec.
  25.853. For compartments less than 25 ft\3\ in interior volume, the design must ensure the ability to contain
  a fire likely to occur within the compartment under normal use.
\2\ Detectors: Enclosed stowage compartments equal to or exceeding 25 ft\3\ in interior volume must be provided
  with a smoke or fire detection system to ensure that a fire can be detected within a one-minute detection
  time. Flight tests must be conducted to show compliance with this requirement. Each system (or systems) must
  provide:
(a) A visual indication in the flight-deck within one minute after the start of a fire;
(b) An aural warning in the crew rest compartment; and
(c) A warning in the main passenger cabin. This warning must be readily detectable by a flight attendant, taking
  into consideration the positioning of flight attendants throughout the main passenger compartment during
  various phases of flight.
\3\ Liner: If it can be shown that the material used to construct the stowage compartment meets the flammability
  requirements of a liner for a Class B cargo compartment, no liner would be required for enclosed stowage
  compartments equal to or greater than 25 ft\3\ but less than 57 ft\3\ in interior volume. For all enclosed
  stowage compartments equal to or greater than 57 ft\3\ but less than or equal to 200 ft\3\ in interior volume,
  a liner must be provided that meets the requirements of Sec.   25.855 at amendment 25-60 for a Class B cargo
  compartment.
\4\ Location Detector: LD-MCR compartments that contain enclosed stowage compartments with an interior volume
  that exceeds 25 ft\3\ and are located away from one central location, such as the entry to the LD-MCR
  compartment or a common area within the LD-MCR compartment, would require additional fire protection features
  or devices to assist the firefighter in determining the location of a fire.

    Issued in Des Moines, Washington, on July 8, 2019.
Mary A. Schooley,
Acting Manager, Transport Standards Branch, Policy and Innovation 
Division, Aircraft Certification Service.
[FR Doc. 2019-14784 Filed 7-10-19; 8:45 am]
BILLING CODE 4910-13-P