ISSUE PAPER

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| **Project:** (Company ABC)\            | **Item:** C-1\              |
| Model (XYZ)                            | \                           |
|                                        | **Stage:** 2                |
| Project \# (CCXXXXLL-T)                |                             |
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|                                        |                             |
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| **Reg.Ref.:** §§ 21.17 and 21.21(b)(2) | **Date:** June 7, 2000      |
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| **National**                           | **Issue Status:** Open      |
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| **Policy Ref.:** AC 25-10, AC 25-17    |                             |
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| **Subject:** Certification of Cooktops | **Branch Action:** ANM-115, |
|                                        | ANM-113,ANM-112             |
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| [See attached memo](../jun0900.DOC)    |                             |
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| Based on GIP \# C-x3                   | **Compliance Target:**      |
|                                        | Pre-TIA                     |
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|                                        |                             |
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*Proposed Special Conditions*

**Statement of Issue: (**Company ABC) is proposing the installation of a
cooktop in a transport category airplane. 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.

**Background:**

Currently, ovens are the prevailing means of heating food on aircraft.
Ovens are characterized by an enclosure which 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
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 aircraft.

**FAA Position: (DATE 1)**

Cooktops could have serious passenger and aircraft safety implications
if appropriate requirements are not established for their installation
and use. The following is a list of general requirements for cooktops
with electrically powered burners. The use of an open flame (e.g.
natural gas) cooktop is beyond the scope of this issue paper and must be
addressed separately. The requirements identified in this proposed
special conditions issue paper are in addition to those considerations
identified in Advisory Circular (AC) 25-10, Guidance for Installation of
Miscellaneous Non-required Electrical Equipment, and those in AC 25-17,
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 aircraft without cooktops.

The special condition is proposed as follows:

"Cooktop installations with electrically powered burners must comply
with the following criteria:

1.  Means, such as conspicuous burner-on 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, e.g.,
    soup, sauces, etc., from the effects of flight loads and turbulence.
    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. 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. Placarding must
    be installed which prohibits the use of cookware that can not be
    accommodated by the restraint system.

3.  Placarding must be installed which prohibits the use of cooktops
    (i.e., 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. Two
    acceptable means of complying with this requirement are as follows:

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a.  Placarding must be installed that prohibits any burner from being
    powered when the cooktop is unattended (note: that this would
    prohibit a single person from cooking on the cooktop and
    intermittently serving food to passengers while any burner is
    powered), and a fire detector must be installed in the vicinity of
    the cooktop which provides an audible warning in the passenger
    cabin, and a fire extinguisher of appropriate size and extinguishing
    agent must be installed in the immediate vicinity of the cooktop.
    Access to the extinguisher must not be blocked by a fire on or
    around the cooktop. One of the fire extinguishers required by
    § 25.851 may be used to satisfy this requirement if the total
    complement of extinguishers can be evenly distributed throughout the
    cabin. If this is not possible, then the extinguisher in the galley
    area would be additional, or,

b.  An automatic, thermally activated fire suppression system must be
    installed to extinguish a fire at the cooktop and immediately
    adjacent surfaces. The agent used in the system must be an approved
    total flooding agent suitable for use in an occupied area. The fire
    suppression system must have a manual override. The automatic
    activation of the fire suppression system must also automatically
    shut off power to the cooktop.

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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 and be included in the instructions for continued
    airworthiness. 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."

    **Applicant's Position:**

    **Conclusion:**

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| Transport Airplane Directorate         | Date                        |
|                                        |                             |
| Aircraft Certification Service         |                             |
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**Contacts:**

  ----------------------- ----------------------- -----------------------
  TITLE                   NAME                    PHONE

  Originator              Terry Rees              \(425\) 227-2138

  Project Manager                                 

  Project Officer         Ross Landes             \(425\) 227--1071
  ----------------------- ----------------------- -----------------------

**File Name:**

**DO NOT REMOVE FROM ATTACHED ISSUE PAPER**

**ISSUE PAPER SIGNATURE GRID**

  -------------- ------------------------------------------------------------
  **SUBJECT:**   Certification of Cooktops

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**SPECIALISTS**

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                 **ACO**    **ACO**    **ACO**    **ACO**    **TAD**    **TAD**

  **Branch**                                                 ANM-112    ANM-115

  **Name**                                                              

  **Initials**                                                          

  **Date**                                                              
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**SPECIALISTS**

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                 **TAD**    **PO**     **NRS**    **PM**     **AEG**    **MIDO**

  **Branch**                ANM-113                                     

  **Name**                                                              

  **Initials**                                                          

  **Date**                                                              
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**ACO BRANCH MANAGEMENT**

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  **Branch**                                                            

  **Name**                                                              

  **Initials**                                                          

  **Date**                                                              
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**TAD STANDARDS STAFF MANAGEMENT**

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                                                               **PRIME**   

  **Branch**                ANM-112                            ANM-115     

  **Name**                  Neil                               Frank       
                            Schalekamp                         Tiangsing   

  **Initials**              N. S.                              F.T.        

  **Date**                  6/8/00                             6/8/00      
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