[Federal Register Volume 71, Number 102 (Friday, May 26, 2006)]
[Proposed Rules]
[Pages 30346-30350]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: E6-8120]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2004-19245; Directorate Identifier 2004-NM-108-AD]
RIN 2120-AA64


Airworthiness Directives; Boeing Model 737-300, -400, -500, -600, 
-700, -700C, -800, and -900 Series Airplanes

AGENCY: Federal Aviation Administration (FAA), Department of 
Transportation (DOT).

ACTION: Supplemental notice of proposed rulemaking (NPRM); reopening of 
comment period.

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SUMMARY: The FAA is revising an earlier proposed airworthiness 
directive (AD) for certain Boeing Model 737-300, -400, -500, -600, -
700, -700C, -800, and -900 series airplanes. The original NPRM would 
have required modifying the wiring for the master dim and test system. 
For certain airplanes, the original NPRM also proposed to require 
related concurrent actions as necessary. The original NPRM resulted 
from a report that the master dim and test system circuit does not have 
wiring separation of the test ground signal for redundant equipment in 
the flight compartment. This action revises the original NPRM by adding 
a new concurrent action for certain airplanes, extending the compliance 
time, and removing certain airplanes from concurrent requirements. We 
are proposing this supplemental NPRM to prevent a single fault failure 
in flight from simulating a test condition and showing test patterns 
instead of the selected radio frequencies on the communications panels, 
which could inhibit communication between the flightcrew and the 
control tower, affecting the continued safe flight of the airplane.

DATES: We must receive comments on this supplemental NPRM by June 20, 
2006.

ADDRESSES: Use one of the following addresses to submit comments on 
this supplemental NPRM.
     Docket Web site: Go to http//dms.dot.gov and follow the 
instructions for sending your comments electronically.
      Government-wide rulemaking Web site: Go to http//
www.regulations.gov and follow the instructions for sending your 
comments electronically.
     Mail: Docket Management Facility; U.S. Department of 
Transportation, 400 Seventh Street, SW., Nassif Building, room PL-401, 
Washington, DC 20590.
     Fax: (202) 493-2251.
     Hand Delivery: Room PL-401 on the plaza level of the 
Nassif Building, 400 Seventh Street, SW., Washington, DC, between 9 
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
    Contact Boeing Commercial Airplanes, P.O. Box 3707, Seattle, 
Washington 98124-2207, for service information identified in this 
proposed AD.

FOR FURTHER INFORMATION CONTACT: Binh Tran, Aerospace Engineer, Systems 
and Equipment Branch, ANM-130S, FAA, Seattle Aircraft Certification 
Office, 1601 Lind Avenue, SW., Renton, Washington 98055-4056; telephone 
(425) 917-6485; fax (425) 917-6590.

SUPPLEMENTARY INFORMATION: 

Comments Invited

    We invite you to submit any relevant written data, views, or 
arguments regarding this supplemental NPRM. Send your comments to an 
address listed in the ADDRESSES section. Include the docket number 
``Docket No. FAA-2004-19245; Directorate Identifier 2004-NM-108-AD'' at 
the beginning of your comments. We specifically invite comments on the 
overall regulatory, economic, environmental, and energy aspects of this 
supplemental NPRM. We will consider all comments received by the 
closing date and may amend this supplemental NPRM in light of those 
comments.
    We will post all comments submitted, without change, to http//
dms.dot.gov, including any personal information you provide. We will 
also post a report summarizing each substantive verbal contact with FAA 
personnel concerning this supplemental NPRM. Using the search function 
of that Web site, anyone can find and read the comments in any of our 
dockets, including the name of the individual who sent the comment (or 
signed the comment on behalf of an association, business, labor union, 
etc.). You may review the DOT's complete Privacy Act Statement in the 
Federal Register published on April 11, 2000 (65 FR 19477-78), or you 
may visit http//dms.dot.gov.

Examining the Docket

    You may examine the AD docket on the Internet at http//dms.dot.gov, 
or in person at the Docket Management Facility office between 9 a.m. 
and 5 p.m., Monday through Friday, except Federal holidays. The Docket 
Management Facility office (telephone (800) 647-5227) is located on the 
plaza level in the Nassif Building at the DOT street address stated in 
ADDRESSES. Comments will be available in the AD docket shortly after 
the Docket Management System receives them.

[[Page 30347]]

Discussion

    We proposed to amend 14 CFR part 39 with a notice of proposed 
rulemaking (NPRM) for an AD (the ``original NPRM'') for certain Boeing 
Model 737-300, -400, -500, -600, -700, -700C, -800 and -900 series 
airplanes. The original NPRM was published in the Federal Register on 
October 5, 2004 (69 FR 59559). The original NPRM proposed to require 
modifying the wiring for the master dim and test system. For certain 
airplanes, the original NPRM also proposed to require related 
concurrent actions as necessary.

Relevant Service Information

    We have reviewed Boeing Service Bulletin 737-33-1133, Revision 3, 
dated September 8, 2005. The service bulletin describes actions similar 
to those in Boeing Service Bulletin 737-33-1133, Revision 2, dated 
December 4, 2003, which was described in the original NPRM as the 
applicable source of service information for certain proposed actions 
on certain airplanes. Revision 3 also reduces the number of airplanes 
subject to certain actions specified in Boeing Service Bulletin 737-33-
1121, Revision 1, dated December 19, 2002. The NPRM refers to 737-33-
1121 as the applicable source of service information for certain 
concurrent actions.
    Boeing Special Attention Service Bulletin 737-33-1132, Revision 2, 
dated September 8, 2005, describes actions similar to Boeing Special 
Attention Service Bulletin 737-33-1132, Revision 1, dated March 4, 
2004, which was described in the original NPRM as the applicable source 
of service information for certain proposed actions on certain other 
airplanes. Revision 2 also adds a concurrent action for certain 
airplanes.
    For certain airplanes, Service Bulletin 737-33-1132, Revision 2, 
recommends prior or concurrent accomplishment of Boeing Service 
Bulletin 737-23-1102, dated June 3, 1999. Service Bulletin 737-23-1102 
describes procedures to replace the VHF and HF communications panels 
with radio control panels.
    Accomplishing the actions specified in the service information is 
intended to adequately address the unsafe condition.

Comments

    We have considered the following comments on the original NPRM.

Supportive Comment

    One commenter, Alaska Airlines, supports the original NPRM.

Request To Delay Release of AD Pending Release of Revised Service 
Bulletins

    Boeing requests that the FAA delay issuing the AD until the release 
of Revision 3 of Boeing Service Bulletin 737-33-1133. The commenter 
states that implementing Service Bulletin 737-33-1133 at Revision 2, 
and implementing the associated concurrent service bulletin (Boeing 
Service Bulletin 737-33-1121, Revision 1, dated December 19, 2002), 
would require operators to perform unnecessary tasks. The commenter 
also points out that revising the service bulletin would help reduce 
the economic impact of the AD by removing the unnecessary tasks. We 
infer that the commenter wants the FAA to reference Revision 3 of the 
service bulletin.
    We agree to reference Boeing Service Bulletin 737-33-1133, Revision 
3, dated September 8, 2005, for the reasons stated by the commenter. We 
have determined that this delay would have no adverse effect on safety, 
and that reference to Revision 3 would assist operators in complying 
with this supplemental NPRM. We have revised paragraph (f) of this AD 
accordingly.

Requests From Operators To Delay Release of the AD

    The Air Transport Association (ATA), on behalf of its member, 
Continental Airlines, requests that certain Boeing service bulletins be 
revised or withdrawn as referenced service bulletins. Continental 
states that there are multiple open issues (such as unnecessary steps 
for airplanes with certain different control panel configurations) and 
complications with those service bulletins. Continental further 
suggests that if the service bulletins are not revised, then the AD 
should be delayed until the open issues with some of the Boeing service 
bulletins are resolved.
    We agree that certain service bulletins referenced in the NPRM need 
revisions. Since publication of the NPRM, some of the affected service 
bulletins have been revised to address open issues and complications. 
However, we do not agree to delay the issuance of this AD until all the 
affected service bulletins are revised. Compliance with some of the 
other affected and un-revised service bulletins may involve requesting 
alternative methods of compliance (AMOCs), since we have determined 
that it could affect safety if we wait for the remaining affected 
service bulletins to be revised. Boeing has also advised that it does 
not plan to revise a few of the remaining affected service bulletins. 
We have revised paragraphs (f), (g) and (h) of this supplemental NPRM 
to reference these revised service bulletins as applicable. Operators 
are welcome to apply for an AMOC as specified in paragraph (i) of this 
supplemental NPRM.

Requests To Extend Compliance Time To Modify Wiring

    The ATA, on behalf of its members, American Airlines, United 
Airlines (UAL), and US Airways, requests extending the compliance time 
from 30 months to better match operators' heavy/base maintenance 
schedule. US Airways suggests a 48-month compliance time and states 
that the proposed 30-month compliance time doesn't match maintenance 
cycles. UAL also notes that the 30-month compliance time will create an 
increase in the time needed for C-check visits. American Airlines 
suggests re-wording the compliance time to ``the next heavy overhaul 
visit'' to prevent unnecessary financial hardship for the airlines.
    We agree to extend the compliance time. We have considered other 
similar actions and have determined that extending the compliance time 
to 48 months will not adversely affect safety. We have revised 
paragraph (f) of this supplemental NPRM accordingly. We do not agree to 
use ``the next heavy overhaul visit,'' since it is an imprecise 
compliance time, and the definition of heavy overhaul visit can vary 
significantly between airplane operators.

Requests To Give Credit for Airplanes Equipped With Aircraft 
Communication and Reporting System (ACARS)

    The ATA, on behalf of UAL, requests that we give credit for 
airplanes equipped with ACARS. UAL states that the NPRM does not give 
credit for those airplanes that are equipped with other means of ground 
communication. UAL explains that ACARS transmits data to an operator's 
dispatch group through the number 3 VHF system (VHF3), which is 
dedicated solely for ACARS usage. The frequency tuning for VHF3 is 
controlled by ACARS, not the VHF control panel. UAL concludes that 
ACARS provides an equivalent level of safety for the purposes of the 
NPRM since the flightcrew is still able to communicate with the ground, 
even if the fault occurs.
    We partially agree with the commenters that ACARS provides some 
level of communication with the ground (usually the airplane operator's 
dispatch or ground support office) when the fault occurs. However, 
assuming the

[[Page 30348]]

operator's dispatch office is able to establish a telephone line with 
the relevant air traffic control (ATC) tower or center, the delays in 
relaying information between the flightcrew and ATC via ACARS can be 
substantial. This fault also simulates a ``test condition'' that 
activates several flight annunciators, switches, and displays, so that 
the selected communication frequency cannot be determined from the 
displays. This increases the workload of the flightcrew and has an 
impact to the safety of the airplane during the approach and landing 
phase of flight. Therefore, the supplemental NPRM has not been revised 
to allow credit for airplanes equipped with ACARS.

Request To Revise Cost Estimate

    The ATA, on behalf of UAL, requests that we revise the cost 
estimate of the modification in the NPRM. UAL states that Service 
Bulletin 737-33-1132 estimates the modification to take 21 work hours 
to complete, and the FAA estimates 14 work hours for the modification. 
UAL believes that the actual cost would be $1,740 per airplane whereas 
we estimate it at $910 per airplane.
    We disagree to revise the estimate of the work hours since the cost 
estimate includes only the time necessary to perform the specific 
actions actually proposed by this supplementary NPRM. The service 
bulletin provides a work hour estimate that includes time needed to 
gain access to and close up the work area. Our estimates also typically 
do not include incidental costs such as planning time, access/close-up 
time, or other incidental or administrative actions. However, since we 
published the original NPRM, we have revised our cost estimate of a 
work hour from $65 to $80 to account for the increased cost of each 
work hour since we last revised that cost estimate. The estimates in 
Cost of Compliance have been revised accordingly.

Request To Revise Service Bulletins To Identify Airplanes With Enhanced 
Ground Proximity Warning System (EGPWS)

    Continental Airlines requests that Boeing Service Bulletin 737-33-
1132 be revised to identify airplanes modified by Boeing's EGPWS 
installation service bulletins and create an additional grouping for 
these EGPWS-modified airplanes. The commenter states that Service 
Bulletin 737-33-1132 has instructions to terminate a wire (number W149-
045-22) to the navigation control panel. Continental adds that the wire 
has already been terminated at the MMR control panel on airplanes 
modified by the EGPWS service bulletins.
    We agree that provisions need to be made for airplanes that have 
had EGPWS installed in accordance with the Boeing EGPWS service 
bulletins. Rather than revising Service Bulletin 737-33-1132 to address 
EGPWS modifications, Boeing has issued Service Bulletin 737-34-1924, 
dated October 17, 2005, to address wire changes and separation. 
Therefore Service Bulletin 737-33-1132 does not need to be revised. We 
have not changed the supplemental NPRM in this regard. However, if the 
commenter believes there is still potential for confusion or 
uncertainty, it is welcome to apply for an AMOC to use Service Bulletin 
737-34-1924 in accordance with paragraph (i) of the supplemental NPRM.

Revise Service Bulletin To Remove Certain Requirements for Non-
Integrated Audio Control Panels (ACPs)

    Continental Airlines and Southwest Airlines request that the Boeing 
Service Bulletins 737-33-1133 and 737-33-1121 be revised to make 
installing provisional wiring for lamp test function an optional action 
for airplanes equipped with non-integrated ACPs. Southwest states that 
Boeing indicated that the wiring for the lamp test is only for fleet 
commonality for airplanes without integrated ACPs. Southwest believes 
that actions should not be mandated for the sake of fleet commonality.
    We agree that the provisional wiring for the lamp test function 
should not be required for the non-integrated ACPs. Boeing has revised 
Service Bulletin 737-33-1133 so that the actions of Service Bulletin 
737-33-1121 will not be required concurrent action on airplanes that do 
not have integrated ACPs. The supplemental NPRM refers to this revised 
service bulletin.

Request To Accommodate Airplanes With Certain Post-Delivery Wiring 
Changes

    Southwest Airlines requests that the wiring installation listed 
within the Boeing service bulletins for automatic direction finder 
(ADF) control panels, Selective Calling on the radio communication 
system (SELCAL), and engine instrument system (EIS), be made optional 
for airplanes without ADF, SELCAL, and EIS installed. The airline 
states that it does not have SELCAL installed in its fleet, nor does it 
operate any airplanes with an EIS system, and is currently in the 
process of removing all ADF control panels from its fleet.
    We agree that such actions should be optional for those airplanes 
without those systems installed. However, Boeing has decided not to 
revise the service bulletins (Boeing Service Bulletins 737-33-1132, 
737-77-1022, and 737-77-1023 for non-EIS configurations and Boeing 
Service Bulletin 737-33-1133 for non-SELCAL configurations) to address 
airplanes with these post-delivery wiring modifications. It is not 
feasible to address each operator's configuration in this supplemental 
NPRM. Operators may submit a request for an AMOC in accordance with 
paragraph (i) of this supplemental NPRM.

Clarification of AMOC Paragraph

    We have revised this supplemental NPRM to clarify the appropriate 
procedure for notifying the principal inspector before using any 
approved AMOC on any airplane to which the AMOC applies.

FAA's Determination and Proposed Requirements of the Supplemental NPRM

    The changes discussed above expand the scope of the original NPRM; 
therefore, we have determined that it is necessary to reopen the 
comment period to provide additional opportunity for public comment on 
this supplemental NPRM.

Costs of Compliance

    There are about 2,868 airplanes of the affected design in the 
worldwide fleet. This supplemental NPRM would affect about 1,181 
airplanes of U.S. registry. The following table provides the estimated 
costs for U.S. operators to comply with this supplemental NPRM.

                                                 Estimated Costs
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                                                        Average labor                                Cost per
       Boeing Service Bulletin           Work hours     rate per hour            Parts               airplane
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737-33-1132, Revision 2..............              14             $80  Nominal..................          $1,120

[[Page 30349]]

 
737-33-1133, Revision 3..............               3              80  Nominal..................             240
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                                                       Estimated Concurrent Service Bulletin Costs
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                                                                                                                     Number of U.S.-
     Boeing service bulletin            Work hours        Average labor          Parts           Cost per airplane     registered         Fleet cost
                                                          rate per hour                                                 airplanes
--------------------------------------------------------------------------------------------------------------------------------------------------------
737-26A1083, Revision 1..........  185.................             $80  Between $30,000 and   Between $44,800 and                1  Between $44,800 and
                                                                          $36,400.              $51,200.                              $51,200.
737-33-1121, Revision 1..........  Between 5 and 6.....              80  Between $200 and      Between $600 and                  83  Between $49,800 and
                                                                          $340.                 $820.                                 $68,060.
737-77-1022, Revision 1..........  72..................              80  No charge...........  $5,760..............               4  $23,040.
737-77-1023, Revision 1..........  Between 1 and 3.....              80  Nominal.............  Between $80 and $240              26  Between $2,080 and
                                                                                                                                      $6,240.
737-23-1102......................  77..................              80  $22,164.............  $28,324.............               0  No fleet cost
                                                                                                                                      unless an affected
                                                                                                                                      airplane is
                                                                                                                                      imported and
                                                                                                                                      placed on U.S.
                                                                                                                                      register.
--------------------------------------------------------------------------------------------------------------------------------------------------------

Authority for This Rulemaking

    Title 49 of the United States Code specifies the FAA's authority to 
issue rules on aviation safety. Subtitle I, Section 106, describes the 
authority of the FAA Administrator. Subtitle VII, Aviation Programs, 
describes in more detail the scope of the Agency's authority.
    We are issuing this rulemaking under the authority described in 
Subtitle VII, Part A, Subpart III, Section 44701, ``General 
requirements.'' Under that section, Congress charges the FAA with 
promoting safe flight of civil aircraft in air commerce by prescribing 
regulations for practices, methods, and procedures the Administrator 
finds necessary for safety in air commerce. This regulation is within 
the scope of that authority because it addresses an unsafe condition 
that is likely to exist or develop on products identified in this 
rulemaking action.

Regulatory Findings

    We have determined that this proposed AD would not have federalism 
implications under Executive Order 13132. This proposed AD would 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.
    For the reasons discussed above, I certify that the 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. 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.
    We prepared a regulatory evaluation of the estimated costs to 
comply with this supplemental NPRM and placed it in the AD docket. See 
the ADDRESSES section for a location to examine the regulatory 
evaluation.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Safety.

The Proposed Amendment

    Accordingly, under the authority delegated to me by the 
Administrator, the FAA proposes to amend 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. The Federal Aviation Administration (FAA) amends Sec.  39.13 by 
adding the following new airworthiness directive (AD):

Boeing: Docket No. FAA-2004-19245; Directorate Identifier 2004-NM-
108-AD.

Comments Due Date

    (a) The FAA must receive comments on this AD action by June 20, 
2006.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to Boeing Model 737-300, -400, and -500 
series airplanes identified in Boeing Special Attention Service 
Bulletin 737-33-1132, Revision 2, dated September 8, 2005; and Model 
737-600, -700, -700C, -800, and -900 series airplanes identified in 
Boeing Service Bulletin 737-33-1133, Revision 3, dated September 8, 
2005; certificated in any category.

Unsafe Condition

    (d) This AD results from a report that the master dim and test 
system circuit does not have wiring separation of the test ground 
signal for redundant equipment in the flight compartment. We are 
issuing this AD to prevent a single fault failure in flight from 
simulating a test condition and showing test patterns instead of the 
selected radio frequencies on the communications panels, which could 
inhibit communication between the flightcrew and the control tower, 
affecting the continued safe flight of the airplane.

Compliance

    (e) You are responsible for having the actions required by this 
AD performed within the compliance times specified, unless the 
actions have already been done.

Modification

    (f) Within 48 months after the effective date of this AD: Modify 
the wiring for the master dim test system in accordance with the 
Accomplishment Instructions of Boeing Special Attention Service 
Bulletin 737-33-1132, Revision 2, dated September 8, 2005 (for Model 
737-300, -400, and -500 series airplanes); and Boeing Service 
Bulletin 737-33-1133, Revision 3, dated September 8,

[[Page 30350]]

2005 (for Model 737-600, -700, -700C, -800, and -900 series 
airplanes); as applicable.

Actions Required To Be Accomplished Prior to or Concurrently With 
Paragraph (f) of This AD

    (g) Prior to or concurrently with accomplishment of paragraph 
(f) of this AD, do the actions specified in Table 1 of this AD, as 
applicable.

                   Table 1.--Prior/Concurrent Actions
------------------------------------------------------------------------
                                 Accomplish all       According to the
            For--              actions associated      Accomplishment
                                     with--           Instructions of--
------------------------------------------------------------------------
Group 57 airplanes            Installing an engine  Boeing Service
 identified in Boeing          instrument system     Bulletin 737-77-
 Special Attention Service     (EIS) and.            1022, Revision 1,
 Bulletin 737-33-1132,                               dated October 26,
 Revision 2, dated September                         1989.
 8, 2005.
                              Modifying the         Boeing Service
                               advisory system for   Bulletin 737-77-
                               the EIS.              1023, Revision 1,
                                                     dated November 9,
                                                     1989.
Group 37 and 46 airplanes     Installing wiring     Boeing Service
 identified in Boeing          for the test system   Bulletin 737-33-
 Service Bulletin 737-33-      for the audio         1121, Revision 1,
 1133, Revision 3, dated       control panel lamp.   dated December 19,
 September 8, 2005.                                  2002.
Group 2 airplanes identified  Installing splice     Boeing Service
 in Boeing Service Bulletin    SP896.                Bulletin 737-
 737-33-1121, Revision 1,                            26A1083, Revision
 dated December 19, 2002.                            1, dated November
                                                     15, 2001.
Group 39 airplanes            Installing a smoke    Boeing Service
 identified in Boeing          detection and fire    Bulletin 737-
 Service Bulletin 737-33-      extinguishing         26A1083, Revision
 1133, Revision 3, dated       system in the cargo   1, dated November
 September 8, 2005.            compartment.          15, 2001.
Group 59 airplanes            Replacing the VHF     Boeing Service
 identified in Boeing          and HF                Bulletin 737-23-
 Special Attention Service     communications        1102, dated June 3,
 Bulletin 737-33-1132,         panels with radio     1999.
 Revision 2, dated September   control panels.
 8, 2005.
------------------------------------------------------------------------

Actions Accomplished per Previous Issue of Service Bulletins

    (h) Actions accomplished before the effective date of this AD in 
accordance with the service bulletins identified in Table 2 of this AD 
are considered acceptable for compliance with the corresponding actions 
specified in this AD.

                                 Table 2.--Previous Issues of Service Bulletins
----------------------------------------------------------------------------------------------------------------
            Service Bulletin                       Revision level                           Date
----------------------------------------------------------------------------------------------------------------
Boeing Service Bulletin 737-33-1133.....  Original........................  December 19, 2002.
Boeing Service Bulletin 737-33-1133.....  Revision 1......................  April 17, 2003.
Boeing Service Bulletin 737-33-1133.....  Revision 2......................  December 4, 2003.
Boeing Special Attention Service          Original........................  March 20, 2003.
 Bulletin 737-33-1132.
Boeing Special Attention Service          Revision 1......................  March 4, 2004.
 Bulletin 737-33-1132.
----------------------------------------------------------------------------------------------------------------

Alternative Methods of Compliance (AMOCs)

    (i)(1) The Manager, Seattle Aircraft Certification Office (ACO), 
FAA, has the authority to approve AMOCs for this AD, if requested in 
accordance with the procedures found in 14 CFR 39.19.
    (2) Before using any AMOC approved in accordance with Sec.  39.19 
on any airplane to which the AMOC applies, notify the appropriate 
principal inspector in the FAA Flight Standards Certificate Holding 
District Office.

    Issued in Renton, Washington, on May 15, 2006.
Kevin M. Mullin,
Acting Manager, Transport Airplane Dierctorate, Aircrft Certification 
Service.
 [FR Doc. E6-8120 Filed 5-25-06; 8:45 am]
BILLING CODE 4910-13-P