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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
CFR Citation: 14 CFR Part 25
Docket ID: [Docket No. NM189; Notice No. 25-01-03-SC]
NOTICE: PROPOSED RULES
ACTION: Airworthiness standards:
DOCUMENT ACTION: Notice of proposed special conditions; request for comments.
SUBJECT CATEGORY: Special Conditions: Gulfstream Model GV Airplanes; Certification of Cooktops
DATES: Comments must be received on or before May 7, 2001.
DOCUMENT SUMMARY: These special conditions are issued for Gulfstream GV airplanes modified by Gulfstream Aerospace Corporation. These modified airplanes will have a novel or unusual design feature when compared to the state of technology envisioned in the airworthiness standards for transport category airplanes. The modification incorporates the installation of an electrically heated surface, called a cooktop. The applicable airworthiness regulations do not contain adequate or appropriate safety standards for addressing the potential hazards that may be introduced by cooktops. 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.
SUMMARY: Special conditions—; Gulfstream Model GV airplanes,
SUPPLEMENTAL INFORMATION
Comments InvitedInterested persons are invited to participate in the making of these proposed special conditions by submitting such written data, views, or arguments as they may desire. Communications should identify the rules docket or notice number and be submitted in duplicate to the address specified above. The Administrator will consider all communications received on or before the closing date for comments. The proposal described in this document may be changed in light of the comments received. All comments received will be available in the Rules Docket for examination by interested persons, both before and after the closing date for comments. A report summarizing each substantive public contact with FAA personnel concerning this rulemaking will be filed in the docket. Commenters wishing the FAA to acknowledge receipt of their comments submitted in response to these proposed special conditions must include with those comments a selfaddressed, stamped postcard on which the following statement is made: ``Comments to Docket No. NM189.'' The postcard will be date stamped and returned to the commenter.
Background Information
On July 28, 2000, Gulfstream Aerospace Corporation, 4150 Donald Douglas Drive, Long Beach, CA, 90808, applied for a Supplemental Type Certificate (STC) to modify Gulfstream Model GV airplanes. The Model GV is a small transport category airplane powered by two 2 BMWRolls Royce Mark BR700710A110 engines, with a maximum takeoff weight of 90,500 pounds. The GV operates with a 2pilot crew and can hold up to 19 passengers.
The modification incorporates the installation of an electrically heated surface, called a cooktop. Cooktops introduce high heat, smoke, and the possibility of fire into the passenger cabin environment. These potential hazards to the airplane and its occupants must be satisfactorily addressed. Since existing airworthiness regulations do not contain safety standards addressing cooktops, special conditions are therefore proposed.
Type Certification Basis
Under the provisions of 14 CFR 21.101, Gulfstream Aerospace Corporation must show that the Model GV airplane, as changed, continues to meet the applicable provisions of the regulations incorporated by reference in Type Certificate Data Sheet No. A12EA, or the applicable regulations in effect on the date of application for the change. The regulations incorporated by reference in the type certificate are commonly referred to as the ``original type certification basis.'' The regulations incorporated by reference in Type Certificate Data Sheet No. A12EA are part 25, as amended by Amendments 251 through 2581, with reversions to earlier Amendments, voluntary compliance to later Amendments, special conditions, equivalent safety findings, and exemptions listed in the Type Certificate Data Sheet.
If the Administrator finds that the applicable airworthiness regulations (that is, part 25 as amended) do not contain adequate or appropriate safety standards for the Gulfstream GV airplanes modified by Gulfstream Aerospace Corporation because of a novel or unusual design feature, special conditions are prescribed under the provisions of Sec. 21.16.
In addition to the applicable airworthiness regulations and special conditions, these Gulfstream GV airplanes must comply with the fuel vent and exhaust emission requirements of part 34 and the noise certification requirements of part 36.
Special conditions, as defined in Sec. 11.19, are issued in accordance with Sec. 11.38, and become part of the type certification basis in accordance with Sec. 21.101(b)(2).
Special conditions are initially applicable to the model for which
they are issued. Should Gulfstream Aerospace Corporation apply at a
later date 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 [[Page 18215]]
also apply to the other model under the provisions of
Sec. 21.101(a)(1).
Novel or Unusual Design Features
As noted earlier, the modification of the Gulfstream GV airplanes will include installation of a cooktop in the passenger cabin. Cooktops introduce high heat, smoke, and the possibility of fire into the passenger cabin environment. The current airworthiness standards of part 25 do not contain adequate or appropriate safety standards to protect the airplane and its occupants from these potential hazards. Accordingly, this system is considered to be a novel or unusual design feature.
Discussion
Currently, ovens are the prevailing means of heating food on airplanes. Ovens are characterized by an enclosure that contains both the heat source and the food being heated. The hazards represented by ovens are thus inherently limited, and are well understood through years of service experience. Cooktops, on the other hand, are characterized by exposed heat sources and the presence of relatively unrestrained hot cookware and heated food, which may represent unprecedented hazards to both occupants and the airplane.
Cooktops could have serious passenger and airplane safety implications if appropriate requirements are not established for their installation and use. The proposed special condition applies to cooktops with electrically powered burners. The use of an open flame cooktop (for example natural gas) is beyond the scope of this proposed special condition and would require separate rulemaking action. The requirements identified in this proposed special condition are in addition to those considerations identified in Advisory Circular (AC) 2510, Guidance for Installation of Miscellaneous Nonrequired Electrical Equipment, and those in AC 2517, Transport Airplane Cabin Interiors Crashworthiness Handbook. The intent of this proposed special condition is to provide a level of safety that is consistent with that on similar airplanes without cooktops.
Applicability
As discussed above, these special conditions are applicable to Gulfstream GV airplanes modified by Gulfstream Aerospace Corporation. Should Gulfstream Aerospace Corporation apply at a later date 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 apply to that model as well under the provisions of Sec. 21.101(a)(1).
Conclusion
This action affects only certain novel or unusual design features on the Gulfstream GV airplanes modified by Gulfstream Aerospace Corporation. 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.
The authority citation for these special conditions is as follows:
Authority: 49 U.S.C. 106(g), 40113, 44701, 44702, 44704. The Proposed Special Conditions
Accordingly, the Federal Aviation Administration (FAA) proposes the following special conditions as part of the supplemental type certification basis for Gulfstream Model GV airplanes modified by Gulfstream Aerospace Corporation:
Cooktop Installations With ElectricallyPowered Burners
1. Means, such as conspicuous burneron indicators, physical barriers, or handholds, must be installed to minimize the potential for inadvertent personnel contact with hot surfaces of both the cooktop and cookware. Conditions of turbulence must be considered.
2. Sufficient design means must be included to restrain cookware
while in place on the cooktop, as well as representative contents
(soups or sauces, for example) from the effects of flight loads and turbulence.
(a) Restraints must be provided to preclude hazardous movement of
cookware and contents. These restraints must accommodate any cookware that is identified for use with the cooktop.
(b) Restraints must be designed to be easily utilized and effective
in service. The cookware restraint system should also be designed so
that it will not be easily disabled, thus rendering it unusable.
(c) Placarding must be installed which prohibits the use of
cookware that cannot be accommodated by the restraint system.
3. Placarding must be installed which prohibits the use of cooktops (that is, power on any burner) during taxi, takeoff, and landing (TTL).
4. Means must be provided to address the possibility of a fire occurring on or in the immediate vicinity of the cooktop caused by materials or grease inadvertently coming in contact with the burners.
Note: Two acceptable means of complying with this requirement are as follows:
or
5. The surfaces of the galley surrounding the cooktop, which would be exposed to a fire on the cooktop surface or in cookware on the cooktop, must be constructed of materials that comply with the flammability requirements of part III of appendix F of part 25. This requirement is in addition to the flammability requirements typically required of the materials in these galley surfaces. During the selection of these materials, consideration must also be given to ensure that the flammability characteristics of the materials will not be adversely affected by the use of cleaning agents and utensils used to remove cooking stains.
6. The cooktop must be ventilated with a system independent of the
airplane cabin and cargo ventilation system. Procedures and time
intervals must be established to inspect and clean or replace the
ventilation system to prevent a fire hazard from the accumulation of
flammable oils. These procedures and time intervals must be [[Page 18216]]
included in the Instructions for Continued Airworthiness (ICA). The
ventilation system ducting must be protected by a flame arrestor.
Note: The applicant may find additional useful information in Society of Automotive Engineers, Aerospace Recommended Practice 85, Rev. E, entitled ``Air Conditioning Systems for Subsonic
Airplanes,'' dated August 1, 1991.
7. Means must be provided to contain spilled foods or fluids in a manner that will prevent the creation of a slipping hazard to occupants and will not lead to the loss of structural strength due to airplane corrosion.
8. Cooktop installations must provide adequate space for the user to immediately escape a hazardous cooktop condition.
9. A means to shut off power to the cooktop must be provided at the galley containing the cooktop and in the cockpit. If additional switches are introduced in the cockpit, revisions to smoke or fire emergency procedures of the AFM will be required.
Issued in Renton, Washington, on March 29, 2001. Donald L. Riggin,
Acting Manager, Transport Airplane Directorate, Aircraft Certification Service.
[FR Doc. 018514 Filed 4501; 8:45 am]
BILLING CODE 491013P
FOR FURTHER INFORMATION CONTACT Alan Sinclair, FAA, Transport Standards Staff, ANM115, Transport Airplane Directorate, Aircraft Certification Service, 1601 Lind Avenue SW., Renton, Washington 98055 4056; telephone (425) 2272195; facsimile (425) 2271149.
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