Airworthiness Directives; McDonnell Douglas Model DC-9 Series Airplanes, and Model MD-88 and MD-90-30 Airplanes

[Federal Register Volume 65, Number 90 (Tuesday, May 9, 2000)]
[Rules and Regulations]
[Pages 26738-26740]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 00-10288]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 97-NM-244-AD; Amendment 39-11704; AD 2000-08-18]
RIN 2120-AA64


Airworthiness Directives; McDonnell Douglas Model DC-9 Series 
Airplanes, and Model MD-88 and MD-90-30 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 McDonnell Douglas Model DC-9 series airplanes, 
and Model MD-88 and MD-90-30 airplanes, that requires replacement of 
the lanyard assembly pins of the evacuation slides with solid 
corrosion-resistant pins. This amendment is prompted by a report that, 
due to stress corrosion on the lanyard pins, the arms of the lanyard 
assembly of the evacuation slide were found to be frozen. The actions 
specified by this AD are intended to prevent the improper deployment of 
the evacuation slide due to stress corrosion, which could delay or 
impede evacuation of passengers during an emergency.

DATES: Effective June 13, 2000. The incorporation by reference of 
certain publications listed in the regulations is approved by the 
Director of the Federal Register as of June 13, 2000.

ADDRESSES: The service information referenced in this AD may be 
obtained from Boeing Commercial Aircraft Group, Long Beach Division, 
3855 Lakewood Boulevard, Long Beach, CA 90846, Attention: Technical 
Publications Business Administration, Dept. C1-L51 (2-60).
    This information may be examined at the Federal Aviation 
Administration (FAA), Transport Airplane Directorate, Rules Docket, 
1601 Lind Avenue, SW., Renton, WA; or at the FAA, Transport Airplane 
Directorate, Los Angeles Aircraft Certification Office, 3960 Paramount 
Boulevard, Lakewood, CA; or at the Office of the Federal Register, 800 
North Capitol Street, NW., suite 700, Washington, DC.

FOR FURTHER INFORMATION CONTACT: Alan Sinclair, Aerospace Engineer, 
Systems and Equipment Branch, ANM-130L, FAA, Transport Airplane 
Directorate, Los Angeles Aircraft Certification Office, 3960 Paramount 
Boulevard, Lakewood, CA 90712-4137; telephone (562) 627-5338; fax (562) 
627-5210.

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 McDonnell Douglas Model 
DC-9 series airplanes, and Model MD-88 and MD-90-30 airplanes was 
published as a supplemental notice of proposed rulemaking (NPRM) in the 
Federal Register on November 26, 1999 (64 FR 66417). That action 
proposed to require replacement of the lanyard assembly pins of the 
evacuation slides with solid corrosion-resistant pins.

Comments Received

    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 Proposed AD

    One commenter supports the proposed AD. Another commenter states 
that the proposed AD does not affect its fleet.

Requests To Revise Applicability Statement of Proposed AD

    Two commenters request that the applicability statement of the 
proposed AD be revised to exclude freighter airplanes on which 
emergency evacuation slides have not been installed. The commenters 
state that such a revision would eliminate alternative method of 
compliance (AMOC) requests. The commenters did not provide any data to 
substantiate their request.
    The FAA does not concur. The FAA is unable to verify that all 
freighter airplanes are not equipped with evacuation slides. Therefore, 
all affected freighter airplanes must be included in the applicability 
statement of the final rule. However, under the provisions of paragraph 
(c) of the final rule, the FAA may consider requests for approval of an 
AMOC if sufficient data are submitted to substantiate that replacement 
of the lanyard pins with solid corrosion-resistant pin are not 
necessary.
    One commenter questions whether Boeing latch assembly, part number 
(P/N) 69-70843-1, should be included in the applicability statement of 
the proposed AD. The commenter states that the roll pin, P/N MS39086-
140, which resulted in the corrosion problem, is present in the Boeing 
latch assembly, as well as the Douglas latch assembly, P/N's 3961899-1 
and 3956939-501.
    The FAA has determined that the subject Boeing latch assemblies are 
not susceptible to stress corrosion, and therefore, are not subject to 
the identified unsafe condition of this AD. Therefore, no change to the 
final rule is necessary.

Requests for Alternative Method of Compliance (AMOC)

    One commenter requests that the FAA approve lanyard assembly pin, 
P/N MS16555-627, as an AMOC for the pin required by the AD (reference 
McDonnell Douglas Alert Service Bulletin DC9-25A357, dated February 11, 
1997). The commenter states that this pin is shorter and would not 
require any machining. If the FAA does not approve the pin having P/N 
MS16555-627, the commenter requests that the FAA approve the 
installation of an unmodified pin, P/N MS16555-628, which would 
protrude from the latch assembly. The commenter states that both of 
these alternatives would not interfere with the operation of the 
lanyard or deployment of the slide and

[[Page 26739]]

would provide the same level of safety as the pin required by the AD.
    The FAA does not concur. The FAA finds that the shorter pin would 
not provide an equivalent level of safety to that of the pin required 
by the AD, because the taper on the end of the shorter pin would not 
provide the same level of pin retention. The shorter pin could become 
loose and fall out of the latch, thus causing the latch to fail. The 
FAA also finds that a pin that extends past the surface of the latch 
could cause the latch to hang up and fail. Therefore, no change to the 
final rule is necessary.
    One commenter requests that the proposed AD be revised to include 
an AMOC, which was approved by the airplane manufacturer, to eliminate 
the need of each airline making a request to the FAA on an individual 
basis. The commenter states that the AMOC involves a program to 
accomplish, among other things, an initial check of the lanyard and 
then to periodically check, clean, and refurbish the subject lanyards 
with new roll pins of the same P/N.
    The FAA does not concur. Because Airplane Maintenance Programs vary 
from operator to operator, there are no assurances that each operator's 
Airplane Maintenance Program contains the identical actions required by 
this AD. However, under the provisions of paragraph (c) of the final 
rule, the FAA may consider requests for approval of an AMOC if 
sufficient data are submitted to substantiate that such an AMOC would 
provide an acceptable level of safety.

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 as proposed.

Cost Impact

    There are approximately 2,167 McDonnell Douglas Model DC-9 series 
airplanes, and Model MD-88 and MD-90-30 airplanes of the affected 
design in the worldwide fleet. The FAA estimates that 1,200 airplanes 
of U.S. registry will be affected by this AD, that it will take 
approximately 2 work hours per airplane to accomplish the required 
actions, and that the average labor rate is $60 per work hour. Based on 
these figures, the cost impact of the AD on U.S. operators is estimated 
to be $144,000, or $120 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 a substantial direct 
effect 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, it 
is determined that this final rule does not have federalism 
implications under Executive Order 13132.
    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:

2000-08-18 McDonnell Douglas: Amendment 39-11704. Docket 97-NM-244-
AD.

    Applicability: Model DC-9 series airplanes, and Model MD-88 
airplanes, as listed in McDonnell Douglas Alert Service Bulletin 
DC9-25A357, Revision 02, dated May 28, 1998; and Model MD-90-30 
airplanes, as listed in McDonnell Douglas Alert Service Bulletin 
MD90-25A019, dated February 11, 1997; 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 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 improper deployment of the evacuation slide, 
which could delay or impede evacuation of passengers during an 
emergency, accomplish the following:

Replacement

    (a) Within 180 days after the effective date of this AD, replace 
the lanyard assembly pins of the evacuation slides with solid 
corrosion-resistant pins, in accordance with McDonnell Douglas Alert 
Service Bulletin MD80-25A357, dated February 11, 1997, Revision 01, 
dated March 16, 1998, or Revision 02, dated May 28, 1998 (for Model 
DC-9 series airplanes and Model MD-88 airplanes); or McDonnell 
Douglas Alert Service Bulletin MD90-25A019, dated February 11, 1997 
(for Model MD-90-30 airplanes); as applicable.

Spares

    (b) As of the effective date of this AD, no lanyard assembly, 
part number (P/N) 3961899-1 or P/N 3956939-501, shall be installed 
on any airplane unless that assembly has been modified in accordance 
with the requirements of paragraph (a) of this AD.

Alternative Methods of Compliance

    (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, Los Angeles 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, Los Angeles ACO.

    Note 2: Information concerning the existence of approved 
alternative methods of compliance with this AD, if any, may be 
obtained from the Los Angeles ACO.

Special Flight Permits

    (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.

Incorporation by Reference

    (e) The replacement shall be done in accordance with McDonnell 
Douglas Alert Service Bulletin MD80-25A357, dated February 11, 1997; 
McDonnell Douglas Alert Service Bulletin DC9-25A357, Revision 01, 
dated March 16, 1998; McDonnell Douglas Alert Service Bulletin DC9-
25A357, Revision

[[Page 26740]]

02, dated May 28, 1998; or McDonnell Douglas Alert Service Bulletin 
MD90-25A019, dated February 11, 1997; as applicable. 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 Aircraft Group, 
Long Beach Division, 3855 Lakewood Boulevard, Long Beach, California 
90846, Attention: Technical Publications Business Administration, 
Dept. C1-L51 (2-60). Copies may be inspected at the FAA, Transport 
Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington; or 
at the FAA, Transport Airplane Directorate, Los Angeles Aircraft 
Certification Office, 3960 Paramount Boulevard, Lakewood, 
California; or at the Office of the Federal Register, 800 North 
Capitol Street, NW., suite 700, Washington, DC.
    (f) This amendment becomes effective on June 13, 2000.

    Issued in Renton, Washington, on April 19, 2000.
Donald L. Riggin,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 00-10288 Filed 5-8-00; 8:45 am]
BILLING CODE 4910-13-U

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