[Federal Register Volume 62, Number 77 (Tuesday, April 22, 1997)]
[Proposed Rules]
[Pages 19526-19527]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 97-10316]



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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 97-NM-07-AD]
RIN 2120-AA64


Airworthiness Directives; Lockheed Model L-188A and L-188C Series 
Airplanes

AGENCY: Federal Aviation Administration, DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: This document proposes the adoption of a new airworthiness 
directive (AD) that is applicable to all Lockheed Model L-188A and L-
188C series airplanes. This proposal would require revising the 
Airplane Flight Manual (AFM) to prohibit the positioning of the power 
levers below the flight idle stop during flight, and to provide a 
statement of the consequences of positioning the power levers below 
flight idle stop. The proposed AD is prompted by incidents and 
accidents involving airplanes equipped with turboprop engines where the 
propeller ground beta was used improperly during flight. The actions 
specified by the proposed AD are intended to prevent loss of airplane 
controllability, or engine overspeed and consequent loss of engine 
power caused by the power levers being positioned below the flight idle 
stop while the airplane is in flight.

DATES: Comments must be received by June 1, 1997.

ADDRESSES: Submit comments in triplicate to the Federal Aviation 
Administration (FAA), Transport Airplane Directorate, ANM-103, 
Attention: Rules Docket No. 97-NM-07-AD, 1601 Lind Avenue, SW., Renton, 
Washington 98055-4056. Comments may be inspected at this location 
between 9:00 a.m. and 3:00 p.m., Monday through Friday, except Federal 
holidays.
    The service information referenced in the proposed rule may be 
obtained from Lockheed Aeronautical Systems Support Company (LASSC), 
Field Support Department, Dept. 693, Zone 0755, 2251 Lake Park Drive, 
Smyrna, Georgia 30080. This information may be examined at the FAA, 
Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, 
Washington; or at the FAA, Small Airplane Directorate, Atlanta Aircraft 
Certification Office, Campus Building, 1701 Columbia Avenue, Suite 2-
160, College Park, Georgia.

FOR FURTHER INFORMATION CONTACT: Thomas Peters, Aerospace Engineer, 
Systems and Flight Test Branch, ACE-116A, FAA, Atlanta Aircraft 
Certification Office, Small Airplane Directorate, Campus Building, 1701 
Columbia Avenue, Suite 2-160, College Park, Georgia 30337-2748; 
telephone (404) 305-7367; fax (404) 305-7348.

SUPPLEMENTARY INFORMATION:

Comments Invited

    Interested persons are invited to participate in the making of the 
proposed rule by submitting such written data, views, or arguments as 
they may desire. Communications shall identify the Rules Docket number 
and be submitted in triplicate to the address specified above. All 
communications received on or before the closing date for comments, 
specified above, will be considered before taking action on the 
proposed rule. The proposals contained in this notice may be changed in 
light of the comments received.
    Comments are specifically invited on the overall regulatory, 
economic, environmental, and energy aspects of the proposed rule. All 
comments submitted will be available, both before and after the closing 
date for comments, in the Rules Docket for examination by interested 
persons. A report summarizing each FAA-public contact concerned with 
the substance of this proposal will be filed in the Rules Docket.
    Commenters wishing the FAA to acknowledge receipt of their comments 
submitted in response to this notice must submit a self-addressed, 
stamped postcard on which the following statement is made: ``Comments 
to Docket Number 97-NM-07-AD.'' The postcard will be date stamped and 
returned to the commenter.

Availability of NPRMs

    Any person may obtain a copy of this NPRM by submitting a request 
to the FAA, Transport Airplane Directorate, ANM-103, Attention: Rules 
Docket No. 97-NM-07-AD, 1601 Lind Avenue, SW., Renton, Washington 
98055-4056.

Discussion

    In recent years, the FAA has received reports of 14 incidents and/
or accidents involving intentional or inadvertent operation of the 
propellers in the ground beta range, which occurred while the airplane 
was in flight on airplanes equipped with turboprop engines. (For the 
purposes of this proposal, Beta is defined as the range of propeller 
operation intended for use during taxi, ground idle, or reverse 
operations as controlled by the power lever settings aft of the flight 
idle stop.)
    Five of the fourteen in-flight beta occurrences were classified as 
accidents. In each of these five cases, operation of the propellers in 
the beta range occurred while the airplane was in flight. Operation of 
the propellers in the beta range during flight, if not prevented, could 
result in loss of airplane controllability, or engine overspeed with 
consequent loss of engine power.
    Communication between the FAA and the public during a meeting held 
on June 11-12, 1996, in Seattle, Washington, revealed a lack of 
consistency of the information on in-flight beta operation contained in 
the FAA-approved airplane flight manual (AFM) for airplanes not 
certificated for in-flight operation with the power levers below the 
flight idle stop. (Airplanes that are certificated for this type of 
operation are not affected by the above-referenced conditions.)

Explanation of Relevant Service Information

    The FAA has reviewed and approved a revision to the Limitations 
Section of the FAA-approved Electra 188C AFM, dated October 17, 1996. 
This revision specifies that positioning the power levers below the 
flight idle stop during flight is prohibited. Additionally, the 
revision contains a cautionary or warning statement of the consequences 
that such positioning of the power levers may lead to loss of airplane 
control, or may result in an engine overspeed condition and consequent 
loss of engine power.

The FAA's Determination

    The FAA has examined the circumstances and reviewed all available 
information related to the incidents and accidents described 
previously. The FAA finds that the Limitations Section of the AFM's for 
certain airplanes must be revised to prohibit positioning the power 
levers below the flight idle stop while the airplane is in flight, and 
to provide a statement of the consequences of positioning the power 
levers below the flight idle stop. The FAA has determined that the 
affected airplanes include those that are equipped with turboprop 
engines and that are not certificated for in-flight operation with the 
power levers below the flight idle stop. Since Lockheed Model L-188A 
and L-188C series airplanes are equipped with turboprop engines, and 
are not certificated for in-flight

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operation with the power levers positioned below the flight idle stop, 
the FAA finds that the AFM for these airplanes must be revised to 
include the limitation and statement of consequences described 
previously.

Explanation of the Requirements of the Proposed AD

    Since an unsafe condition has been identified that is likely to 
exist or develop in other Lockheed Model L-188A and L-188C series 
airplanes of the same type design, the proposed AD would require 
revising the Limitations Section of the AFM to prohibit the positioning 
of the power levers below the flight idle stop during flight, and to 
provide a statement of consequences of such positioning of the power 
levers.

Interim Action

    This is considered interim action until final action is identified, 
at which time the FAA may consider further rulemaking.

Cost Impact

    There are approximately 75 Lockheed Model L-188A and L-188C series 
airplanes of the affected design in the worldwide fleet. The FAA 
estimates that 32 airplanes of U.S. registry would be affected by this 
proposed AD, that it would take approximately 1 work hour per airplane 
to accomplish the proposed actions, and that the average labor rate is 
$60 per work hour. Based on these figures, the cost impact of the 
proposed AD on U.S. operators is estimated to be $1,920, or $60 per 
airplane.
    The cost impact figure discussed above is based on assumptions that 
no operator has yet accomplished any of the proposed requirements of 
this AD action, and that no operator would accomplish those actions in 
the future if this AD were not adopted.

Regulatory Impact

    The regulations proposed herein would not have substantial direct 
effects on the States, on the relationship between the national 
government and the States, or on the distribution of power and 
responsibilities among the various levels of government. Therefore, in 
accordance with Executive Order 12612, it is determined that this 
proposal would not have sufficient federalism implications to warrant 
the preparation of a Federalism Assessment.
    For the reasons discussed above, I certify that this proposed 
regulation (1) is not a ``significant regulatory action'' under 
Executive Order 12866; (2) is not a ``significant rule'' under the DOT 
Regulatory Policies and Procedures (44 FR 11034, February 26, 1979); 
and (3) if promulgated, will not have a significant economic impact, 
positive or negative, on a substantial number of small entities under 
the criteria of the Regulatory Flexibility Act. A copy of the draft 
regulatory evaluation prepared for this action is contained in the 
Rules Docket. A copy of it may be obtained by contacting the Rules 
Docket at the location provided under the caption ADDRESSES.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Safety.

The Proposed Amendment

    Accordingly, pursuant to the authority delegated to me by the 
Administrator, the Federal Aviation Administration proposes to amend 
part 39 of the Federal Aviation Regulations (14 CFR part 39) as 
follows:

PART 39--AIRWORTHINESS DIRECTIVES

    1. The authority citation for part 39 continues to read as follows:

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


Sec. 39.13  [Amended]

    2. Section 39.13 is amended by adding the following new 
airworthiness directive:

Lockheed: Docket 97-NM-07-AD.

    Applicability: All Model L-188A and L-188C series airplanes, 
certificated in any category.

    Note 1: This AD applies to each airplane identified in the 
preceding applicability provision, regardless of whether it has been 
modified, altered, or repaired in the area subject to the 
requirements of this AD. For airplanes that have been modified, 
altered, or repaired so that the performance of the requirements of 
this AD is affected, the owner/operator must request approval for an 
alternative method of compliance in accordance with paragraph (b) of 
this AD. The request should include an assessment of the effect of 
the modification, alteration, or repair on the unsafe condition 
addressed by this AD; and, if the unsafe condition has not been 
eliminated, the request should include specific proposed actions to 
address it.

    Compliance: Required as indicated, unless accomplished 
previously.
    To prevent loss of airplane controllability or engine overspeed 
with consequent loss of engine power caused by the power levers 
being positioned below the flight idle stop while the airplane is in 
flight, accomplish the following:
    (a) Within 30 days after the effective date of this AD, revise 
the Limitations Section of the FAA-approved Airplane Flight Manual 
(AFM) to include the following statements. This action may be 
accomplished by inserting either a copy of this AD into the AFM or 
the revision to the Limitations Section of the FAA-approved Electra 
188A or 188C AFM, dated October 17, 1996.
    ``Positioning of power levers below the flight idle stop while 
the airplane is in flight is prohibited. Such positioning may lead 
to loss of airplane control or may result in an overspeed condition 
and consequent loss of engine power.''
    (b) An alternative method of compliance or adjustment of the 
compliance time that provides an acceptable level of safety may be 
used if approved by the Manager. Operators shall submit their 
requests through an appropriate FAA Principal Operations Inspector, 
who may add comments and then send it to the Manager, Atlanta 
Aircraft Certification Office (ACO), FAA, Small Airplane 
Directorate.

    Note 2: Information concerning the existence of approved 
alternative methods of compliance with this AD, if any, may be 
obtained from the Atlanta ACO.

    (c) Special flight permits may be issued in accordance with 
sections 21.197 and 21.199 of the Federal Aviation Regulations (14 
CFR 21.197 and 21.199) to operate the airplane to a location where 
the requirements of this AD can be accomplished.

    Issued in Renton, Washington, on April 16, 1997.
Darrell M. Pederson,
 Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 97-10316 Filed 4-21-97; 8:45 am]
BILLING CODE 4910-13-U