[Federal Register Volume 59, Number 161 (Monday, August 22, 1994)]
[Unknown Section]
[Page 0]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 94-20286]
Federal Register / Vol. 59, No. 161 / Monday, August 22, 1994 /
[[Page Unknown]]
[Federal Register: August 22, 1994]
VOL. 59, NO. 161
Monday, August 22, 1994
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. 94-NM-124-AD; Amendment 39-9007; AD 94-17-12]
Airworthiness Directives; Jetstream Model 4101 Airplanes
AGENCY: Federal Aviation Administration, DOT.
ACTION: Final rule; request for comments.
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SUMMARY: This amendment adopts a new airworthiness directive (AD) that
is applicable to certain Jetstream Model 4101 airplanes. This action
requires repetitive removal of the spoiler actuators, purging the
hydraulic system, and installation of an actuator that has been
previously certified. This amendment is prompted by a report of damage
to the locking mechanisms on some pistons of the spoiler actuators. The
actions specified in this AD are intended to prevent uncommanded
extension of the lift spoiler in the event of loss of hydraulic
pressure in the spoiler actuator.
DATES: Effective September 6, 1994.
The incorporation by reference of certain publications listed in
the regulations is approved by the Director of the Federal Register as
of September 6, 1994. -
Comments for inclusion in the Rules Docket must be received on or
before October 21, 1994.
ADDRESSES: Submit comments in triplicate to the Federal Aviation
Administration (FAA), Transport Airplane Directorate, ANM-103,
Attention: Rules Docket No. 94-NM-124-AD, 1601 Lind Avenue, SW.,
Renton, Washington 98055-4056.
The service information referenced in this AD may be obtained from
Jetstream Aircraft, Incorporated, P.O. Box 16029, Dulles International
Airport, Washington, DC 20041-6029. This information may be examined at
the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton,
Washington; or at the Office of the Federal Register, 800 North Capitol
Street, NW., suite 700, Washington, DC.
FOR FURTHER INFORMATION CONTACT: William Schroeder, Aerospace Engineer,
Standardization Branch, ANM-113, FAA, Transport Airplane Directorate,
1601 Lind Avenue, SW., Renton, Washington 98055-4056; telephone (206)
227-2148; fax (206) 227-1320.
SUPPLEMENTARY INFORMATION: The Civil Aviation Authority (CAA), which is
the airworthiness authority for the United Kingdom, recently notified
the FAA that an unsafe condition may exist on certain Jetstream Model
4101 airplanes. The CAA advises that, during routine maintenance, the
locking mechanisms on the pistons of the spoiler actuators were found
to be damaged. The cause of this damage has been attributed to
inadequate bleeding of the spoiler hydraulic system. In some instances,
the spoiler operation was out of sequence and may have caused damage to
the locking mechanisms on the pistons of the spoiler actuators. This
condition, if not corrected, could result in uncommanded extension of
the lift spoiler in the event of loss of hydraulic pressure in the
spoiler actuator.
Jetstream has issued Alert Service Bulletin J41-A27-034, dated June
9, 1994, which describes procedures for removal of the left and right
spoiler actuators, purging the hydraulic system, and installation of a
previously certified spoiler actuator. The CAA classified this alert
service bulletin as mandatory in order to assure the continued
airworthiness of these airplanes in the United Kingdom.
This airplane model is manufactured in the United Kingdom and is
type certificated for operation in the United States under the
provisions of section 21.29 of the Federal Aviation Regulations (14 CFR
21.29) and the applicable bilateral airworthiness agreement. Pursuant
to this bilateral airworthiness agreement, the CAA has kept the FAA
informed of the situation described above. The FAA has examined the
findings of the CAA, 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, this AD is being issued to prevent uncommanded
extension of the lift spoiler. This AD requires repetitively removing
the spoiler actuators, purging the hydraulic system, and installing an
actuator that has been previously certified. The actions are required
to be accomplished in accordance with the alert service bulletin
described previously.
This is considered to be interim action until final action is
identified, at which time the FAA may consider further rulemaking.
Since a situation exists that requires the immediate adoption of
this regulation, it is found that notice and opportunity for prior
public comment hereon are impracticable, and that good cause exists for
making this amendment effective in less than 30 days.
Comments Invited
Although this action is in the form of a final rule that involves
requirements affecting flight safety and, thus, was not preceded by
notice and an opportunity for public comment, comments are invited on
this rule. Interested persons are invited to comment on this 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 under the caption ``ADDRESSES.''
All communications received on or before the closing date for comments
will be considered, and this rule may be amended in light of the
comments received. Factual information that supports the commenter's
ideas and suggestions is extremely helpful in evaluating the
effectiveness of the AD action and determining whether additional
rulemaking action would be needed.
Comments are specifically invited on the overall regulatory,
economic, environmental, and energy aspects of the rule that might
suggest a need to modify the 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 that
summarizes each FAA-public contact concerned with the substance of this
AD will be filed in the Rules Docket.
Commenters wishing the FAA to acknowledge receipt of their comments
submitted in response to this rule must submit a self-addressed,
stamped postcard on which the following statement is made: ``Comments
to Docket Number 94-NM-124-AD.'' The postcard will be date stamped and
returned to the commenter.
The regulations adopted herein will 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 final
rule does not have sufficient federalism implications to warrant the
preparation of a Federalism Assessment.
The FAA has determined that this regulation is an emergency
regulation that must be issued immediately to correct an unsafe
condition in aircraft, and that it is not a ``significant regulatory
action'' under Executive Order 12866. It has been determined further
that this action involves an emergency regulation under DOT Regulatory
Policies and Procedures (44 FR 11034, February 26, 1979). If it is
determined that this emergency regulation otherwise would be
significant under DOT Regulatory Policies and Procedures, a final
regulatory evaluation will be prepared and placed in the Rules Docket.
A copy of it, if filed, may be obtained from the Rules Docket at the
location provided under the caption ADDRESSES.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.
Adoption of the Amendment
Accordingly, pursuant to the authority delegated to me by the
Administrator, the Federal Aviation Administration amends 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. 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:
94-17-12 Jetstream Aircraft Limited: Amendment 39-9007. Docket 94-
NM-124-AD.
Applicability: Model 4101 airplanes having airplane constructors
numbers 41004 through 41033 inclusive, certificated in any category.
Compliance: Required as indicated, unless accomplished
previously.
To prevent uncommanded extension of the lift spoiler in the
event of loss of hydraulic pressure in the spoiler actuator,
accomplish the following:
(a) Within 21 days after the effective date of this AD, remove
the spoiler actuators in accordance with Jetstream Alert Service
Bulletin J41-A27-034, dated June 9, 1994. Following removal of the
actuators, accomplish the requirements of paragraphs (a)(1) and
(a)(2) of this AD, in accordance with the service bulletin.
(1) Prior to further flight, purge the hydraulic system to
ensure that there is no contamination.
(2) Prior to further flight, install a spoiler actuator that has
been previously certified and marked with an ``R'' after the serial
number on the nameplate of the actuator.
(b) Thereafter, repeat the requirements of paragraph (a) of this
AD at intervals not to exceed 500 landings.
(c) As of 21 days after the effective date of this AD, all
spoiler actuators installed on any airplane shall be previously
certified and bear an ``R'' after the serial number on the nameplate
of the actuator, in accordance with Jetstream Alert Service Bulletin
J41-A27-034, dated June 9, 1994.
(d) 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, Standardization Branch, ANM-113,
FAA, Transport Airplane Directorate. Operators shall submit their
requests through an appropriate FAA Principal Maintenance Inspector,
who may add comments and then send it to the Manager,
Standardization Branch, ANM-113.
Note: Information concerning the existence of approved
alternative methods of compliance with this AD, if any, may be
obtained from the Standardization Branch, ANM-113.
(e) 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.
(f) The actions shall be done in accordance with Jetstream Alert
Service Bulletin J41-A27-034, dated June 9, 1994. This incorporation
by reference was approved by the Director of the Federal Register in
accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be
obtained from Jetstream Aircraft, Incorporated, P.O. Box 16029,
Dulles International Airport, Washington, DC 20041-6029. Copies may
be inspected at the FAA, Transport Airplane Directorate, 1601 Lind
Avenue, SW., Renton, Washington; or at the Office of the Federal
Register, 800 North Capitol Street, NW., suite 700, Washington, DC.
(g) This amendment becomes effective on September 6, 1994.
Issued in Renton, Washington, on August 12, 1994.
Darrell M. Pederson,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 94-20286 Filed 8-19-94; 8:45 am]
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