[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