[Federal Register Volume 59, Number 189 (Friday, September 30, 1994)]
[Unknown Section]
[Page 0]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 94-24202]
[[Page Unknown]]
[Federal Register: September 30, 1994]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. 94-NM-113-AD]
Airworthiness Directives; Fokker Model F28 Mark 0100 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 Fokker Model F28 Mark 0100
series airplanes. This proposal would require modification of the fixed
engine cowling at the forward and aft crane beam attachment; and an
inspection of the forward and aft crane beam to detect surface damage,
and repair, if necessary. This proposal is prompted by several reports
of rear cabin noise (engine rumble) during flight and while taxiing,
which may have been caused by the interference between the forward and
aft crane beams and the fasteners in the fixed engine cowling. The
actions specified by the proposed AD are intended to prevent chafing
due to normal engine vibration, which could result in structural damage
to the engine mount and possible separation of the engine from the
airplane.
DATES: Comments must be received by November 10, 1994.
ADDRESSES: Submit comments in triplicate to the Federal Aviation
Administration (FAA), Transport Airplane Directorate, ANM-103,
Attention: Rules Docket No. 94-NM-113-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 Fokker Aircraft USA, Inc., 1199 North Fairfax Street,
Alexandria, Virginia 22314. This information may be examined at the
FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton,
Washington.
FOR FURTHER INFORMATION CONTACT: Tim Dulin, Aerospace Engineer,
Standardization Branch, ANM-113, FAA, Transport Airplane Directorate,
1601 Lind Avenue, SW., Renton, Washington 98055-4056; telephone (206)
227-2141; fax (206) 227-1320.
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 94-NM-113-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. 94-NM-113-AD, 1601 Lind Avenue, SW., Renton, Washington
98055-4056.
Discussion
The Rijksluchtvaartdienst (RLD), which is the airworthiness
authority for the Netherlands, recently notified the FAA that an unsafe
condition may exist on certain Fokker Model F28 Mark 0100 series
airplanes. The RLD advises that it has received several reports of rear
cabin noise (engine rumble) experienced on these airplanes during
flight and while taxiing. Investigation revealed that one possible
cause was interference between the forward and aft crane beams and the
fasteners in the fixed engine cowling. Such interference could result
in chafing due to normal engine vibration. This condition, if not
corrected, could result in structural damage to the engine mount and
possible separation of the engine from the airplane.
Fokker has issued Service Bulletin SBF100-71-016, dated February
18, 1994, which describes procedures for modification of the fixed
engine cowling at the forward and aft crane-beam attachment; and a
visual inspection of the forward and aft crane beam to detect surface
damage, and repair, if necessary. This modification entails replacing
fasteners of the fixed engine cowling with fasteners of a different
type. This modification will ensure the structural integrity of the
engine mount. The RLD classified this service bulletin as mandatory and
issued Netherlands Airworthiness Directive BLA 94-038 (A), dated
February 21, 1994, in order to assure the continued airworthiness of
these airplanes in the Netherlands.
This airplane model is manufactured in the Netherlands 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 RLD has kept the FAA informed of
the situation described above. The FAA has examined the findings of the
RLD, 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 modification of the
fixed cowl at the forward and aft crane-beam attachment; and performing
a visual inspection of the forward and aft crane beam to detect surface
damage, and repair, if necessary. The actions would be required to be
accomplished in accordance with the service bulletin described
previously.
The FAA estimates that 83 airplanes of U.S. registry would be
affected by this proposed AD, that it would take approximately 90 work
hours per airplane to accomplish the proposed inspection and
modification, and that the average labor rate is $55 per work hour.
Required parts would cost approximately $75 per airplane. Based on
these figures, the total cost impact of the proposed AD on U.S.
operators is estimated to be $417,075, or $5,025 per airplane.
The total 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.
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. 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:
Fokker: Docket 94-NM-113-AD.
Applicability: Model F28 Mark 0100 series airplanes, serial
numbers 11244 through 11438 inclusive, certificated in any category.
Compliance: Required as indicated, unless accomplished
previously.
To prevent structural damage to the engine mount and possible
separation of the engine from the airplane, accomplish the
following:
(a) Prior to the accumulation of 15,000 total flight hours, or
within 3 months after the effective date of this AD, whichever
occurs later, accomplish the requirements of paragraphs (a)(1) and
(a)(2) of this AD in accordance with Fokker Service Bulletin SBF100-
71-016, dated February 18, 1994.
(1) Modify the fixed engine cowling at the forward and aft
crane-beam attachment in accordance with the service bulletin.
(2) Perform a visual inspection of the forward and aft crane
beam to detect surface damage, in accordance with the service
bulletin.
(i) If no surface damage is found, no further action is required
by paragraph (a)(2) of this AD.
(ii) If any surface damage is found, prior to further flight,
repair the crane beam in accordance with the 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, 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.
(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 September 26, 1994.
Darrell M. Pederson,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 94-24202 Filed 9-29-94; 8:45 am]
BILLING CODE 4910-13-U
