[Federal Register Volume 63, Number 190 (Thursday, October 1, 1998)]
[Rules and Regulations]
[Pages 52587-52589]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 98-25952]
[[Page 52587]]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. 97-NM-85-AD; Amendment 39-10804; AD 98-20-37]
RIN 2120-AA64
Airworthiness Directives; Boeing Model 747-100, -200, and -300
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 Boeing Model 747-100, -200, and -300 series
airplanes, that requires the replacement of certain switches located in
the cabin attendant's panel at doors 1 and 3 right with new, improved
switches. This amendment is prompted by reports indicating that fires
have occurred on some airplanes due to the internal failure of some of
these switches. The actions specified by this AD are intended to
prevent the installation and use of such switches that could short
circuit when they fail, and consequently cause fire and smoke aboard
the airplane.
DATES: Effective November 5, 1998.
The incorporation by reference of certain publications listed in
the regulations is approved by the Director of the Federal Register as
of November 5, 1998.
ADDRESSES: The service information referenced in this AD may be
obtained from Boeing Commercial Airplane Group, P.O. Box 3707, Seattle,
Washington 98124-2207. 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: Forrest Keller, Senior Aerospace
Engineer, Systems and Equipment Branch, ANM-130S, FAA, Seattle Aircraft
Certification Office, 1601 Lind Avenue, SW., Renton, Washington;
telephone (425) 227-2790; fax (425) 227-1181.
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 Boeing Model 747-100, -
200, and -300 series airplanes was published in the Federal Register on
May 30, 1997 (62 FR 29306). That action proposed to require the
replacement of certain switches located in the cabin attendant's panel
at doors 1 and 3 right with new, improved switches.
Actions Since Issuance of Proposal
Since the issuance of the proposal, the FAA has received a report
of incidents of burned switches and fire found behind the cabin
attendant's switch panels at doors 2, 3, and 4 right on Boeing Model
747-100 series airplanes. Investigation revealed that the power
switches burned due to an internal failure of the switch and resulted
in a short circuit to ground.
Description of New Service Information
Since the issuance of the proposal, the FAA also has reviewed and
approved Boeing Alert Service Bulletin 747-33A2261, Revision 1, dated
June 4, 1998, which describes procedures for replacing certain power
switches with new, improved switches. The improved switches will
prevent an internal failure of the switch that could result in a short
circuit between the switch and its ground, thereby reducing the
potential for fire or smoke. The switches described in the alert
service bulletin are the switches for the passenger entertainment and/
or passenger service system on the cabin attendant's switch panel at
doors 1 left, 1 right, 3 left, 3 right, 4 left, and 5 right, and in the
stairwell and upper deck. The alert service bulletin also describes
procedures for installing a ground clamp, reterminating the wires in
the connectors, modifying certain circuit breakers, and performing a
continuity test on the panel when the modification is complete.
Accomplishment of the actions specified in Revision 1 of the alert
service bulletin is intended to adequately address the identified
unsafe condition.
The manufacturer has advised that the procedures described in
Boeing Alert Service Bulletin 747-33A2252, dated August 1, 1996, as
amended by Boeing Notice of Status Change 747-33A2252 NSC 01, dated
October 10, 1996 (cited as the appropriate source of service
information in the proposal), apply only to doors 2 and 4 right and
will not work for doors 1 and 3 right. Boeing Alert Service Bulletin
747-33A2261, described previously, specifies procedures that apply to
doors 1 and 3 right. Boeing Alert Service Bulletin 747-33A2261 adds a
procedure for modification of certain circuit breakers that is not
specified by Boeing Alert Service Bulletin 747-33A2252. The final rule
specifically omits that modification. Therefore, this change of service
information referenced in the final rule will not increase the scope of
the AD.
Additionally, the applicability of the proposed AD referenced
airplanes listed in Boeing Alert Service Bulletin 747-33A2252; the
effectivity of that alert service bulletin includes all Model 747-100,
-200, and -300 series airplanes. However, the applicability of this
final rule has been revised to specify that it applies only to Model
747-100, -200, and -300 series airplanes having cabin attendant's
panels installed at doors 1 and 3 right. The effectivity of the alert
service bulletin referenced in this final rule (Boeing Alert Service
Bulletin 747-33A2261) includes Model 747SP series airplanes, as well as
Model 747-100, -200, and -300 series airplanes. However, to include
Model 747SP series airplanes in this final rule would require the
issuance of a supplemental notice of proposed rulemaking to reopen the
public comment period. To delay this final rule would be inappropriate,
since the FAA has determined that an unsafe condition exists and the
required actions must be accomplished to ensure continued safety.
However, the FAA may consider additional rulemaking to address the
identified unsafe condition on Model 747SP series airplanes.
Comments to the NPRM
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
Several commenters support the proposed rule.
Request To Withdraw the Proposal
One commenter questions why the replacement action specified by the
proposal should be mandatory. This commenter reports that it has seen
no instances of short circuiting of the cabin attendant's panel
switches at door 1 or 3 right. The commenter states that Boeing's
review of the switches at these doors revealed no problems.
The FAA infers that the commenter requests that the proposed AD be
withdrawn as unnecessary. The FAA does not concur. The manufacturer has
reported an incident of burned switches found behind the attendant's
panel at door 3 right, and several instances of problems with switches
at other panels within the Model 747 fleet. Failure of the subject
switches could cause short circuiting and result in fire and smoke
aboard the airplane. Consequently, the FAA has determined that AD
action is
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necessary to correct this unsafe condition.
Request To Extend the Compliance Time
Several commenters request that the compliance time be extended
beyond the proposed 10 months; the commenters suggest various
compliance times ranging up to 2 years. The commenters' various reasons
for extending the compliance time are explained below.
Several commenters question whether required parts will be
available in a timely manner.
Other commenters request an extended compliance time
because of the anticipated lead time and the time required for
accomplishment of the actions on a large fleet. One commenter adds that
a compliance time coinciding with the normal ``C'' check would reduce
the significant service disruption that would be caused by a 10-month
compliance time.
The FAA concurs with the request to extend the compliance time. In
light of the information presented, the FAA finds that such an
extension will allow the modification to be performed on this large
fleet with minimal effect on the maintenance schedule and no adverse
effect on safety. Paragraphs (a) and (b) of the final rule have been
revised to specify a compliance time of 14 months.
Operators should note that, since issuance of the proposal, the
manufacturer has issued a new alert service bulletin (described
previously) and has made available the required parts. Therefore, lack
of appropriate service information or required parts will no longer
present a problem for operators to comply with the AD in a timely
manner.
Request To Revise Cost Estimate
One commenter states that the cost to be incurred by the actions
required by this AD will greatly exceed the cost as stated in the
proposal. The commenter states that all of its comments made in
response to related AD 97-08-05, amendment 39-9993 (62 FR 17534, April
10, 1997), which concerns panels at doors 2 and 4 right, apply equally
to this AD, which concerns similar panels at doors 1 and 3 right. In a
letter dated January 30, 1997, responsive to AD 97-08-05, the commenter
had stated that the cost associated with rebuilding the panels at doors
2 and 4 was $41,500 per airplane.
The FAA infers that the commenter requests that the cost estimate
be revised in the final rule. The FAA does not concur. The cost
estimate described in this AD included consideration of several
comments, including those submitted by this commenter, in response to
AD 97-08-05. Because the commenter provided no justification for its
objection to the cost figures, and because no other commenter took
issue with the costs described in the proposed rule, the FAA considers
that the cost estimate is accurate.
Explanation of Editorial Change to Rule
Paragraph (b) of the proposal stated that installation of a certain
``cabin attendant's panel'' would be prohibited. However, reference to
a switch in a cabin attendant's panel was inadvertently omitted in the
proposal. The final rule has been revised to refer to ``a switch in a
cabin attendant's panel'' having a certain part number.
Differences Between the AD and the Alert Service Bulletin
Boeing Alert Service Bulletin 747-33A2261 describes additional
procedures for certain airplanes for modification of certain circuit
breakers. The FAA has determined that, while operators of those
airplanes may accomplish this modification, the action as proposed
(replacement of the switches) is adequate to address the identified
unsafe condition. The AD therefore will not require modification of the
circuit breakers.
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 changes described
previously. The FAA has determined that these changes will neither
increase the economic burden on any operator nor increase the scope of
the AD.
Cost Impact
There are approximately 648 Boeing Model 747-100, -200, and -300
series airplanes of the affected design in the worldwide fleet. The FAA
estimates that 167 airplanes of U.S. registry will be affected by this
AD.
It will take approximately 10 work hours per airplane to accomplish
the required switch replacement, at an average labor rate of $60 per
work hour. Required parts will cost approximately $2,600 per airplane
($1,300 per panel). Based on these figures, the cost impact of the
switch replacement required by this AD on U.S. operators is estimated
to be $534,400, or $3,200 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:
98-20-37 Boeing: Amendment 39-10804. Docket 97-NM-85-AD.
Applicability: Model 747-100, -200, and -300 series airplanes;
having cabin attendant's panels installed at doors 1 and 3 right;
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
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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 the installation and use of switches in the cabin
attendant's panels at doors 1 right and 3 right that could short
circuit when they fail, and consequently cause fire and smoke aboard
the airplane, accomplish the following:
(a) Within 14 months after the effective date of this AD,
replace the passenger entertainment switches and the passenger
service system power switches, as applicable, in the cabin
attendant's panels located at doors 1 right and 3 right, with new,
improved switches, in accordance with Boeing Alert Service Bulletin
747-33A2261, Revision 1, dated June 4, 1998.
(b) As of 14 months after the effective date of this AD, no
person shall install at doors 1 right and 3 right of any airplane a
switch in a cabin attendant's panel having a part number identified
in the ``Old Switch'' column of any table contained in Boeing Alert
Service Bulletin 747-33A2261, Revision 1, dated June 4, 1998.
(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, Seattle Aircraft Certification
Office (ACO), 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, Seattle ACO.
Note 2: Information concerning the existence of approved
alternative methods of compliance with this AD, if any, may be
obtained from the Seattle ACO.
(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 replacement shall be done in accordance with Boeing
Alert Service Bulletin 747-33A2261, Revision 1, dated June 4, 1998.
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 Boeing Commercial Airplane Group,
P.O. Box 3707, Seattle, Washington 98124-2207. 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 November 5, 1998.
Issued in Renton, Washington, on September 22, 1998.
Darrell M. Pederson,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 98-25952 Filed 9-30-98; 8:45 am]
BILLING CODE 4910-13-U 10
