[Federal Register Volume 59, Number 236 (Friday, December 9, 1994)]
[Unknown Section]
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From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 94-30399]
[[Page Unknown]]
[Federal Register: December 9, 1994]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. 94-NM-122-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 a certain
galley; repetitive inspections to detect damage and determine the
clearance of generator wires in the auxiliary power unit (APU); and
repair or replacement of the damaged wires. This proposal would also
require an additional modification of a certain galley, which would
terminate the repetitive inspection requirements. This proposal is
prompted by reports that, during an unscheduled removal of a certain
galley from the production line, the insulation of one of the generator
wires of the APU was found damaged due to inadequate clearance with the
adjacent structure. The actions specified by the proposed AD are
intended to prevent such damage, which could result in a short in the
electrical wiring of the APU and, thus, pose a potential fire hazard.
DATES: Comments must be received by February 7, 1995.
ADDRESSES: Submit comments in triplicate to the Federal Aviation
Administration (FAA), Transport Airplane Directorate, ANM-103,
Attention: Rules Docket No. 94-NM-122-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 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-122-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-122-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, during an unscheduled removal of a
Nordskog Galley Model No. 1-871 from the production line, the
insulation of one of the generator wires of the auxiliary power unit
(APU) was found to be damaged. The cause of such damage has been
attributed to inadequate clearance between the generator wires and
adjacent structure. This condition, if not corrected, could result in a
short in the electrical wiring of the APU and, thus, pose a potential
fire hazard.
Fokker has issued Service Bulletin SBF100-24-029, dated June 28,
1993, which describes procedures for modification of Nordskog Galley
Model 1-871 to replace a bolt; repetitive inspections to detect damage
and determine the adequacy of clearance between the generator wires,
having part numbers (P/N) AJC0001A, AJ0001B, and AJC0001C, of the APU
and the adjacent structure; and repair or replacement of the damaged
wires. This service bulletin also contains an attachment (Nordskog
Engineering Change Order 43589, dated May 20, 1993) that describes
procedures for modification of the Nordskog Galley Model 1-871. This
modification involves removing existing screws and ``T'' nuts and
installing new screws, washers, and nuts inside the cart compartment of
the rear galley. This modification would eliminate the need for the
repetitive inspections. The RLD issued Netherlands airworthiness
directive BLA 93-117 (A), dated September 10, 1993, 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
Nordskog Galley Model 1-871 to replace a specific bolt; repetitive
inspections to detect damage and determine the adequacy of clearance of
certain generator wires of the APU; and repair or replacement of the
damaged wires. This proposed AD would also require an additional
modification of the Nordskog Galley Model 1-871, which, when
accomplished, would constitute terminating action for the repetitive
inspection requirements. The actions would be required to be
accomplished in accordance with the service bulletin described
previously.
As a result of recent communications with the Air Transport
Association (ATA) of America, the FAA has learned that, in general,
some operators may misunderstand the legal effect of AD's on airplanes
that are identified in the applicability provision of the AD, but that
have been altered or repaired in the area addressed by the AD. The FAA
points out that all airplanes identified in the applicability provision
of an AD are legally subject to the AD. If an airplane has been altered
or repaired in the affected area in such a way as to affect compliance
with the AD, the owner or operator is required to obtain FAA approval
for an alternative method of compliance with the AD, in accordance with
the paragraph of each AD that provides for such approvals. A note has
been included in this notice to clarify this requirement.
-The FAA estimates that 52 airplanes of U.S. registry would be
affected by this proposed AD, that it would take approximately 2 work
hours per airplane to accomplish the proposed actions, and that the
average labor rate is $60 per work hour. Required parts would cost
approximately $1,000 per airplane. Based on these figures, the total
cost impact of the proposed AD on U.S. operators is estimated to be
$58,240, or $1,120 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-122-AD.
-Applicability: Model F28 Mark 0100 series airplanes; as listed
in Fokker Service Bulletin SBF100-24-029, dated June 28, 1993;
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 use the authority
provided in paragraph (c) to request approval from the FAA. This
approval may address either no action, if the current configuration
eliminates the unsafe condition; or different actions necessary to
address the unsafe condition described in this AD. Such a request
should include an assessment of the effect of the changed
configuration on the unsafe condition addressed by this AD. In no
case does the presence of any modification, alteration, or repair
remove any airplane from the applicability of this AD.
Compliance: Required as indicated, unless accomplished
previously.
-To prevent a short in the electrical wiring of the auxiliary
power unit (APU) and a potential fire hazard, accomplish the
following:
-(a) Within 250 flight hours after the effective date of this
AD, accomplish paragraphs (a)(1) and (a)(2) of this AD.
-(1) Modify Nordskog Galley Model 1-871, in accordance with
paragraphs 2.A., 2.B., and 2.C. of the Accomplishment Instructions
of Fokker Service Bulletin SBF100-24-029, dated June 28, 1993.
-(2) Perform an inspection to detect damage and determine the
adequacy of clearance of the generator wires, having part numbers
(P/N) AJC0001A, AJ0001B, and AJC0001C, of the auxiliary power unit
(APU), in accordance with Fokker Service Bulletin SBF100-24-029,
dated June 28, 1993.
-(i) If no wires are found damaged and they adequately clear the
adjacent structure (positive clearance), repeat the inspection
thereafter at intervals not to exceed 3,000 flight hours.
-(ii) If no wires are found damaged and they do not adequately
clear the adjacent structure, repeat the inspection thereafter at
intervals not to exceed 250 flight hours.
-(iii) If any wire is found damaged, prior to further flight,
modify the Nordskog Galley Model 1-871 in accordance with paragraph
(b) of this AD, and repair or replace the damaged wire in accordance
with the service bulletin. However, the modification and repair/
replacement actions may be postponed for a maximum of 10 days after
detection of the damage, provided that the APU generator is rendered
inoperative in accordance with the Master Minimum Equipment List
(MMEL), and that modification and repair/replacement actions are
accomplished prior to reactivation of the APU generator.
-(b) At the next removal of the Nordskog Galley Model 1-871, or
within 9,000 flight hours after the effective date of this AD,
whichever occurs first, modify the Nordskog Galley in accordance
with Fokker Service Bulletin SBF100-24-029 (reference Nordskog
Engineering Change Order 43589 Attachment), dated June 28, 1993.
Accomplishment of this modification constitutes terminating action
for the repetitive inspection requirements of this AD.
-(c) 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 2: Information concerning the existence of approved
alternative methods of compliance with this AD, if any, may be
obtained from the Standardization Branch, ANM-113.
-(d) 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 December 5, 1994.
Darrell M. Pederson,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 94-30399 Filed 12-8-94; 8:45 am]
BILLING CODE 4910-13-U