[Federal Register Volume 66, Number 122 (Monday, June 25, 2001)]
[Notices]
[Page 33736]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 01-15898]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

[Policy Statement No. ANM-01-111-159]


All-Electrical Attitude, Altitude, Direction, and Airspeed 
Systems Using Battery Standby Power

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed policy statement; request for comments.

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SUMMARY: The Federal Aviation Administration (FAA) announces the 
availability of a proposed policy statement that clarifies current FAA 
certification policy with respect to all-electrical attitude, altitude, 
direction, and airspeed systems using battery standby power.

DATES: Send your comments on or before July 25, 2001.

ADDRESSES: Address your comments to the individual identified under FOR 
FURTHER INFORMATION CONTACT.

FOR FURTHER INFORMATION CONTACT: Dale Dunford, Federal Aviation 
Administration, Transport Airplane Directorate, Transport Standards 
Staff, Airplane and Flight Crew Interface Branch, ANM-111, 1601 Lind 
Avenue SW., Renton, WA 98055-4056.; telephone (425) 227-2239; fax (425) 
227-1100; e-mail: [email protected].

SUPPLEMENTARY INFORMATION:

Comments Invited

    The proposed policy statement is available on the Internet at the 
following address: http://www.faa.gov/avr/air/anm/draftpolicy/interim.htm. If you do not have access to the Internet, you can obtain 
a copy of the policy statement by contacting the person listed under 
FOR FURTHER INFORMATION CONTACT.
    The FAA invites your comments on this proposed policy statement. We 
will accept your comments, data, views, or arguments by letter, fax, or 
e-mail. Send your comments to the person indicated in FOR FURTHER 
INFORMATION CONTACT. Mark your comments, ``Comments to Policy Statement 
ANM-01-111-159.''
    Use the following format when preparing your comments:
     Organize your comments issue-by-issue.
     For each issue, state what specific change you are 
requesting to the proposed general statement of policy.
     Include justification, reasons, or data for each change 
you are requesting.
    We also welcome comments in support of the proposed policy.
    We will consider all communications received on or before the 
closing date for comments. We may change the proposed policy because of 
the comments received.

Background

    With the advent of highly reliable, low power, liquid crystal 
display (LCD) electrical indicators, applicants for certification of 
transport category airplanes and their components are replacing 
previous pneumatic indicators with electric ones, resulting in an all-
electric attitude, altitude, direction, or airspeed configuration. Many 
of these installations rely on time-limited batteries to power the 
instruments in the event of loss of generator power on the airplane. 
Such all-electric configurations must be designed to ensure continued 
safe flight and landing after any failure or combination of failures 
not shown to be extremely improbable, including the loss of generated 
electrical power.
    The proposed policy statement provides guidelines that should be 
used for the certification of flight instrument installations in which
     All displays of any of the essential flight information 
(e.g., altitude, attitude, airspeed, or direction) require electrical 
power,
     The failure of normal electrical power is not extremely 
improbable, and
     The back-up source of electrical power is a time-limited 
battery.

    Issued in Renton, Washington, on June 19, 2001.
Ali Bahrami,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 01-15898 Filed 6-22-01; 8:45 am]
BILLING CODE 4910-13-U