[Federal Register Volume 59, Number 27 (Wednesday, February 9, 1994)]
[Unknown Section]
[Page 0]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 94-2914]
[[Page Unknown]]
[Federal Register: February 9, 1994]
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DEPARTMENT OF TRANSPORTATION
14 CFR Part 39
[Docket No. 93-NM-207-AD]
Airworthiness Directives; Canadair Model CL-600-1A11, -2A12, and
-2B16 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 certain Canadair Model CL-600-
1A11, -2A12, and -2B16 series airplanes. This proposal would require a
test of the engine throttle quadrant to determine if the throttle lever
bypasses the idle stop into the shut-off position, and modification of
the throttle quadrant or replacement of the throttle quadrant with a
modified unit. This proposal is prompted by reports of unintentional
engine shutdown on Model CL-600-2A12 and -2B16 series airplanes. The
actions specified by the proposed AD are intended to prevent
inadvertent shutdown of an engine while the airplane is taxiing or in
flight.
DATES: Comments must be received by April 5, 1994.
ADDRESSES: Submit comments in triplicate to the Federal Aviation
Administration (FAA), Transport Airplane Directorate, ANM-103,
Attention: Rules Docket No. 93-NM-207-AD, 1601 Lind Avenue, SW.,
Renton, Washington 98055-4056. Comments may be inspected at this
location between 9 a.m. and 3 p.m., Monday through Friday, except
Federal holidays.
The service information referenced in the proposed rule may be
obtained from Bombardier, Inc., Canadair, Aerospace Group, P.O. Box
6087, Station A, Montreal, Quebec H3C 3G9, Canada. This information may
be examined at the FAA, Transport Airplane Directorate, 1601 Lind
Avenue, SW., Renton, Washington; or at the FAA, Engine and Propeller
Directorate, New York Aircraft Certification Office, 181 South Franklin
Avenue, Valley Stream, New York.
FOR FURTHER INFORMATION CONTACT: Raymond J. O'Neill, Aerospace
Engineer, Propulsion Branch, ANE-174, FAA, Engine and Propeller
Directorate, New York Aircraft Certification Office, 181 South Franklin
Avenue, room 202, Valley Stream, New York 11581; telephone (516) 791-
7421; fax (516) 791-9024.
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 93-NM-207-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. 93-NM-207-AD, 1601 Lind Avenue, SW., Renton, Washington
98055-4056.
Discussion -
Transport Canada Aviation, which is the airworthiness authority for
Canada, recently notified the FAA that an unsafe condition may exist on
certain Canadair Model CL-600-1A11, -2A12, and -2B16 series airplanes.
Transport Canada Aviation advises that it has received two reports of
unintentional engine shutdown: One incident occurred during flight on a
Model CL-600-2A12, the other occurred on a Model CL-600-2B16 while the
airplane was on the ground. In both cases, engine shutdown occurred
when the throttle lever over-rode the idle stop during throttle
retardation. The throttle lever then moved directly to the shut-off
position. -
Tests results performed on throttle quadrants that were both
installed and not installed revealed that, in some cases, the idle stop
spring-loaded pawl can be lifted sufficiently for it to pass over the
idle stop without pressure being applied to the release latch. This
condition becomes more apparent when the friction device on the
quadrant is loaded and a side load is applied to the throttle lever.
This condition, if not corrected, could result in inadvertent shutdown
of an engine while the airplane is taxiing or in flight. -
Model CL-600-1A11 series airplanes are similar in type design to
the airplane models on which the reported incidents occurred.
Therefore, all three models are subject to the addressed unsafe
condition. -
Bombardier has issued Canadair Alert Service Bulletin A600-0615,
dated June 10, 1992 (for Model CL-600-1A11 series airplanes), and
Canadair Alert Service Bulletin A601-0374 (for Model CL-600-2A12 and -
2B16 series airplanes), Revision 1, dated September 30, 1992. These
service bulletins describe procedures for a test of the engine throttle
quadrant to determine if the throttle lever bypasses the idle stop into
the shut-off position, and modification of the throttle quadrant or
replacement of the throttle quadrant with a modified unit. The
modification involves removing material from the small triangular area
on the outboard sides of both idle stop pawls to obtain specified
protrusion dimensions or foot widths, testing each throttle lever to
ensure it does not pass the idle stop into the shut-off position, and
permanently reidentifying the unit. Transport Canada Aviation
classified these service bulletins as mandatory and issued Canadian
Airworthiness Directive CF-92-23, dated November 17, 1992, in order to
assure the continued airworthiness of these airplanes in Canada. -
The Canadair alert service bulletins discussed previously reference
two service bulletins as additional sources of service information:
Sargent Aerospace Service Bulletins 43058-76-03 (for Model CL-600-1A11
series airplanes) and 43068-76-05 (for Model CL-600-2A12 and -2B16
series airplanes), both dated April 13, 1992. -
This airplane model is manufactured in Canada and is type
certificated for operation in the United States under the provisions of
Sec. 21.29 of the Federal Aviation Regulations and the applicable
bilateral airworthiness agreement. Pursuant to this bilateral
airworthiness agreement, Transport Canada Aviation has kept the FAA
informed of the situation described above. The FAA has examined the
findings of Transport Canada Aviation, reviewed all available
information, and determined that AD action is necessary for products of
this type design that are certificated for operation in the United
States. -
Since an unsafe condition has been identified that is likely to
exist or develop on other airplanes of the same type design registered
in the United States, the proposed AD would require a test of the
engine throttle quadrant to determine if the throttle lever bypasses
the idle stop into the shut-off position, and modification of the
throttle quadrant or replacement of the throttle quadrant with a
modified unit. The actions would be required to be accomplished in
accordance with the Canadair alert service bulletins described
previously. -
The FAA estimates that 150 airplanes of U.S. registry would be
affected by this proposed AD, that it would take approximately 17 work
hours per airplane to accomplish the proposed actions, and that the
average labor rate is $55 per work hour. Based on these figures, the
total cost impact of the proposed AD on U.S. operators is estimated to
be $140,250, or $935 per airplane. This total cost figure assumes that
no operator has yet accomplished the proposed requirements of this AD
action. -
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 14
CFR part 39 of the Federal Aviation Regulations as follows:
PART 39--[AMENDED]
1. The authority citation for part 39 continues to read as follows:
Authority: 49 U.S.C. App. 1354(a), 1421 and 1423; 49 U.S.C.
106(g); and 14 CFR 11.89.
Sec. 39.13 [Amended]
2. Section 39.13 is amended by adding the following new
airworthiness directive:
Canadair Limited: Docket 93-NM-207-AD.
Applicability: Model CL-600-1A11 series airplanes, serial
numbers 1004 through 1085 inclusive, equipped with Sargent throttle
quadrants, part numbers 600-90601-69, -71, and -73; Model CL-600-
2A12 series airplanes, serial numbers 3001 through 3066 inclusive,
equipped with Sargent throttle quadrants, part numbers 600-90601-
983, -1013, -1015, -1017, and -1019; and Model CL-600-2B16 series
airplanes, serial numbers 5001 through 5114 inclusive, equipped with
Sargent throttle quadrants, part numbers 600-90601-983, -1013, -
1015, -1017, and -1019; certificated in any category.
Compliance: Required as indicated, unless accomplished
previously.
To prevent inadvertent shutdown of an engine while the airplane
is taxiing or in flight, accomplish the following:
(a) Within 50 hours time-in-service after the effective date of
this AD, perform a test of the engine throttle quadrant to determine
if the throttle lever bypasses the idle stop into the shut-off
position, in accordance with Canadair Alert Service Bulletins A600-
0615, dated June 10, 1992 (for Model CL-600-1A11 series airplanes),
or A601-0374, Revision 1, dated September 30, 1992 (for Model CL-
600-2A12 and -2B16 series airplanes), as applicable.
Note 1: Canadair Alert Service Bulletins A600-0615 and A601-0374
reference Sargent Aerospace Service Bulletins 43058-76-03 (for Model
CL-600-1A11 series airplanes) and 43058-76-05 (for Model CL-600-2A12
and -2B16 series airplanes), both dated April 13, 1992, for
additional service information.
(1) If the throttle lever bypasses the idle stop into the shut-
off position, prior to further flight, modify the throttle quadrant
or replace the throttle quadrant with a modified unit, in accordance
with the applicable service bulletin.
(2) If the throttle lever does not bypass the idle stop into the
shut-off position, within 600 landings after the effective date of
this AD, modify the throttle quadrant or replace the throttle
quadrant with a modified unit, in accordance with the applicable
service bulletin.
(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, New York Aircraft Certification
Office (ACO), FAA, Engine and Propeller Directorate. Operators shall
submit their requests through an appropriate FAA Principal
Maintenance Inspector, who may add comments and then send it to the
Manager, New York ACO.
Note 2: Information concerning the existence of approved
alternative methods of compliance with this AD, if any, may be
obtained from the New York ACO.
(c) Special flight permits may be issued in accordance with
Federal Aviation Regulations (FAR) 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 February 3, 1994.
N.B. Martenson,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 94-2914 Filed 2-8-94; 8:45 am]
BILLING CODE 4910-13-U
