[Federal Register Volume 61, Number 182 (Wednesday, September 18, 1996)]
[Rules and Regulations]
[Pages 49051-49053]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 96-23711]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 95-NM-252-AD; Amendment 39-9760; AD 96-19-14]
RIN 2120-AA64


Airworthiness Directives; Fokker Model F28 Mark 0100 Series 
Airplanes

AGENCY: Federal Aviation Administration, DOT.

ACTION: Final rule.

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SUMMARY: This amendment adopts a new airworthiness directive (AD), 
applicable to certain Fokker Model F28 Mark 0100 series airplanes, that 
requires replacement of certain flexible oxygen hoses, located in the 
flight compartment gangway and in the consoles, with insulated hose 
assemblies. This amendment is prompted by reports of either 
insufficient or no clearance between these hoses and adjacent structure 
or electrical wiring. The actions specified by this AD are intended to 
prevent chafing of the

[[Page 49052]]

flexible oxygen hoses, which could result in an uncontrollable loss of 
oxygen from the flightcrew oxygen system, and could allow the presence 
of oxygen in areas where ignition is possible.

DATES: Effective October 23, 1996.
    The incorporation by reference of certain publications listed in 
the regulations is approved by the Director of the Federal Register as 
of October 23, 1996.
ADDRESSES: The service information referenced in this AD may be 
obtained from Fokker Aircraft USA, Inc., 1199 North Fairfax Street, 
Alexandria, Virginia 22314. This information may be examined at the 
Federal Aviation Administration (FAA), Transport Airplane Directorate, 
Rules Docket, 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: 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) 227-1149.

SUPPLEMENTARY INFORMATION: A proposal to amend part 39 of the Federal 
Aviation Regulations (14 CFR part 39) to include an airworthiness 
directive (AD) that is applicable to certain Fokker Model F28 Mark 0100 
series airplanes was published in the Federal Register on March 28, 
1996 (61 FR 13791). That action proposed to require replacement of 
flexible oxygen hoses with insulated hose assemblies.
    Interested persons have been afforded an opportunity to participate 
in the making of this amendment. Due consideration has been given to 
the comments received.

Support for the Proposal

    One commenter supports the proposed rule.

Request To Clarify Installation Requirement

    One commenter requests that paragraph (b) of the proposed rule, 
which prohibits installation of a hose assembly with part number (P/N) 
A66152-417 or A66152-407 on the airplane, be revised to clarify that 
these flexible hoses may be installed at other locations on the 
airplane.
    The FAA concurs. The intent of the AD was to prohibit the 
installation of the flexible hoses only in those locations specified in 
paragraph (a) of the AD, i.e., the flight compartment gangway and the 
left-hand and right-hand side consoles. Paragraph (b) of the AD has 
been revised to clarify this intent.

Conclusion

    After careful review of the available data, including the comments 
noted above, the FAA has determined that air safety and the public 
interest require the adoption of the rule with the change previously 
described. The FAA has determined that this change will neither 
increase the economic burden on any operator nor increase the scope of 
the AD.

Cost Impact

    The FAA estimates that 21 airplanes of U.S. registry will be 
affected by this AD, that it will take approximately 4 work hours per 
airplane to accomplish the required actions, and that the average labor 
rate is $60 per work hour. Required parts will cost approximately 
$1,376 per airplane. Based on these figures, the cost impact of the AD 
on U.S. operators is estimated to be $33,936, or $1,616 per airplane.
    The cost impact figure discussed above is based on assumptions that 
no operator has yet accomplished any of the requirements of this AD 
action, and that no operator would accomplish those actions in the 
future if this AD were not adopted.

Regulatory Impact

    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.
    For the reasons discussed above, I certify that this action (1) is 
not a ``significant regulatory action'' under Executive Order 12866; 
(2) is not a ``significant rule'' under DOT Regulatory Policies and 
Procedures (44 FR 11034, February 26, 1979); and (3) 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 final evaluation has been prepared for this action 
and it is contained in the Rules Docket. A copy of it 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. 106(g), 40113, 44701.


Sec. 39.13  [Amended]

    2. Section 39.13 is amended by adding the following new 
airworthiness directive:

96-19-14  Fokker: Amendment 39-9760. Docket 95-NM-252-AD.

    Applicability: Model F28 Mark 0100 series airplanes, having 
serial numbers 11244 through 11321 inclusive, and 11323 through 
11332 inclusive; certificated in any category.

    Note 1: This AD applies to each airplane identified in the 
preceding applicability provision, regardless of whether it has been 
otherwise 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 request approval for an 
alternative method of compliance in accordance with paragraph (c) of 
this AD. The request should include an assessment of the effect of 
the modification, alteration, or repair on the unsafe condition 
addressed by this AD; and, if the unsafe condition has not been 
eliminated, the request should include specific proposed actions to 
address it.

    Compliance: Required as indicated, unless accomplished 
previously.
    To prevent an uncontrollable loss of oxygen from the flightcrew 
oxygen system due to chafing of the flexible oxygen hoses, which 
could result in the presence of oxygen in areas where ignition is 
possible; accomplish the following:
    (a) Within 12 months or 3,000 flight cycles after the effective 
date of this AD, whichever occurs first, replace the flexible oxygen 
hoses having part number (P/N) A66152-407, located in the left-hand 
(LH) and right-hand (RH) side consoles with insulated tube 
assemblies having P/N D66127-401; and replace the flexible oxygen 
assemblies having P/N A66152-417, located in the flight compartment 
gangway with insulated tube assemblies having P/N D66127-403; in 
accordance with Fokker Service Bulletin SBF100-35-004, dated May 17, 
1995.
    (b) As of the effective date of this AD, no person shall install 
a hose assembly with P/N A66152-417 or A66152-407, in the flight 
compartment gangway or in the LH or RH side consoles of any 
airplane.

[[Page 49053]]

    (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.
    (e) The replacements shall be done in accordance with Fokker 
Service Bulletin SBF100-35-004, dated May 17, 1995. 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 Fokker Aircraft USA, Inc., 1199 
North Fairfax Street, Alexandria, Virginia 22314. 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.
    (f) This amendment becomes effective on October 23, 1996.

    Issued in Renton, Washington, on September 10, 1996.
James V. Devany,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 96-23711 Filed 9-17-96; 8:45 am]
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