Document ID: FAA-2018-0188-0001
Agency: faa
Document Type: Rule
Title: Airworthiness Directives: Diamond Aircraft Industries GmbH Airplanes
Posted Date: 2018-05-23T04:00Z

[Federal Register Volume 83, Number 100 (Wednesday, May 23, 2018)]
[Rules and Regulations]
[Pages 23780-23788]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2018-10580]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2018-0188; Product Identifier 2018-CE-002-AD; Amendment 
39-19285; AD 2018-10-10]
RIN 2120-AA64

Airworthiness Directives; Diamond Aircraft Industries GmbH 
Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final rule; request for comments

-----------------------------------------------------------------------

SUMMARY: We are superseding Airworthiness Directive (AD) 2017-01-12, AD 
2017-11-08, and AD 2017-15-09 for certain Diamond Aircraft Industries 
GmbH Model DA 42 airplanes. This AD results from mandatory continuing 
airworthiness information (MCAI) issued by the aviation authority of 
another country to identify and address an unsafe condition on an 
aviation product. The MCAI describes the unsafe condition as 
uncommanded engine shutdown during flight due to failure of the 
propeller-regulating valve caused by hot exhaust gases coming from 
fractured engine exhaust pipes. We are issuing this AD to require 
actions to address the unsafe condition on these products.

DATES: This AD is effective June 12, 2018.
    The Director of the Federal Register approved the incorporation by 
reference of certain publications listed in this AD as of June 12, 
2018.
    The Director of the Federal Register approved the incorporation by 
reference of certain other publications listed in this AD as of May 31, 
2017 (82 FR 24843, May 31, 2017) and August 1, 2017 (82 FR 35630, 
August 1, 2017).
    We must receive comments on this AD by July 9, 2018.

ADDRESSES: You may send comments by any of the following methods:
     Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the instructions for submitting comments.
     Fax: (202) 493-2251.

[[Page 23781]]

     Mail: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue SE, Washington, DC 20590.
     Hand Delivery: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue SE, Washington, DC 20590, between 9 a.m. and 5 p.m., 
Monday through Friday, except Federal holidays.
    For service information identified in this AD, contact Diamond 
Aircraft Industries GmbH, N.A. Otto-Stra[beta]e 5, A-2700 Wiener 
Neustadt, Austria, telephone: +43 2622 26700; fax: +43 2622 26780; 
email: [email protected]; internet: http://www.diamondaircraft.com. 
You may review copies of the referenced service information at the FAA, 
Small Airplane Standards Branch, 901 Locust, Kansas City, Missouri 
64106. For information on the availability of this material at the FAA, 
call (816) 329-4148. It is also available on the internet at http://www.regulations.gov by searching for locating Docket No. FAA-2018-0188.

Examining the AD Docket

    You may examine the AD docket on the internet at http://www.regulations.gov by searching for and locating Docket No. FAA-2018-
0188; or in person at Docket Operations between 9 a.m. and 5 p.m., 
Monday through Friday, except Federal holidays. The AD docket contains 
this AD, the regulatory evaluation, any comments received, and other 
information. The street address for Docket Operations (telephone (800) 
647-5527) is in the ADDRESSES section. Comments will be available in 
the AD docket shortly after receipt.

FOR FURTHER INFORMATION CONTACT: Mike Kiesov, Aerospace Engineer, FAA, 
Small Airplane Standards Branch, 901 Locust, Room 301, Kansas City, 
Missouri 64106; telephone: (816) 329-4144; fax: (816) 329-4090; email: 
[email protected].

SUPPLEMENTARY INFORMATION:

Discussion

    We issued AD 2017-01-12, Amendment 39-18779 (82 FR 5359, January 
18, 2017) (``AD 2017-01-12''); AD 2017-11-08, Amendment 39-18907 (82 FR 
24843, May 31, 2017) (``AD 2017-11-08''), and AD 2017-15-09, Amendment 
39-18969 (82 FR 35630, August 1, 2017) (``AD 2017-15-09''). Those ADs 
required actions intended to address an unsafe condition on certain 
Diamond Aircraft Industries GmbH Model DA 42 airplanes and was based on 
mandatory continuing airworthiness information (MCAI) originated by an 
aviation authority of another country.
    Since we issued AD 2017-01-12, AD 2017-11-08, and AD 2017-15-09, 
the European Aviation Safety Agency (EASA) has issued a new AD.
    The EASA, which is the Technical Agent for the Member States of the 
European Community, has issued AD No. 2017-0254, dated December 21, 
2017 (referred to after this as ``the MCAI''), to correct an unsafe 
condition for the specified products. The MCAI states:

    Two cases were reported of uncommanded engine in-flight shutdown 
(IFSD) on DA 42 aeroplanes. Subsequent investigation identified that 
these occurrences were due to failure of the propeller regulating 
valve, caused by hot exhaust gases coming from fractured engine 
exhaust pipes. The initiating cracks on the exhaust pipes were not 
detected during previous inspections, since those exhaust pipes are 
equipped with non-removable heat shields that do not allow 
inspection for certain sections of the exhaust pipe.
    This condition, if not corrected, could lead to further cases of 
IFSD or overheat damage, possibly resulting in a forced landing, 
with consequent damage to the aeroplane and injury to occupants.
    To address this potential unsafe condition, Diamond Aircraft 
Industries (DAI) developed an exhaust pipe without a directly 
attached integral heat shield that allows visual inspection over the 
entire exhaust pipe length. DAI issued Mandatory Service Bulletin 
(MSB) 42-120 and relevant Working Instruction (WI) WI-MSB 42-120, 
providing instructions to install the modified exhaust pipes. As an 
interim measure, an additional bracket was designed to hold the 
exhaust pipe in place in case of a pipe fracture. EASA issued AD 
2016-0156 (later revised), requiring replacement of the exhaust 
pipes with pipes having the new design, or installation of the 
additional brackets.
    After EASA AD 2016-0156R1 was issued, cracks were found during 
inspection on modified exhaust pipes. Further investigation 
determined that, with the modified exhaust pipe design, vibration 
leads to cracking. Consequently, DAI published MSB 42-129, providing 
instructions for inspection of modified exhaust pipes, and EASA 
issued AD 2017-0090, retaining the requirements of EASA AD 2016-
0156R1, which was superseded, and additionally requiring repetitive 
inspections of modified exhaust pipes and, depending on findings, 
repair or replacement.
    After EASA AD 2017-0090 was issued, cracks were found on 
additional brackets, as previously installed per DAI WI-MSB 42-120. 
Prompted by these findings, DAI revised MSB 42-120 and the relevant 
part of WI-MSB 42-120 (now at Revision 4), providing improved 
instructions for the installation of brackets, and additional 
instructions to inspect those brackets. Consequently, EASA issued AD 
2017-0120, retaining the requirements of EASA AD 2017-0090, which 
was superseded, and additionally requiring those actions for the 
additional brackets. That [EASA] AD also required reinstallation of 
the additional brackets in accordance with improved instructions.
    Since EASA AD 2017-0120 was issued, it has been determined that 
installation of additional exhaust pipe brackets, combined with 
additional inspections, is the most adequate solution to address the 
original unsafe condition, while it was also established that the 
modified exhaust pipes without directly attached heat shield are not 
adequate as replacement parts. Durability analysis of the design is 
still under investigation and further improvements in the exhaust 
design are expected.
    For the reasons described above, this [EASA] AD partially 
retains the requirements of EASA AD 2017-0120, which is superseded, 
removing the option to install a modified exhaust pipe without 
direct heat shield, and adding inspection requirements for 
aeroplanes modified in accordance with Section III.2 of DAI WI-MSB 
42-120 Revision 3 or later (installation of additional brackets), 
and for aeroplanes on which an exhaust pipe with directly attached 
heat shield was re-installed in accordance with DAI OSB 42-131.

    You may examine the MCAI on the internet at http://www.regulations.gov by searching for and locating Docket No. FAA-2018-
0188.

Relative Service Information Under 1 CFR Part 51

    Diamond Aircraft Industries GmbH (DAI) has issued Work Instruction 
WI-MSB 42-120, Revision 3, dated July 6, 2017, Work Instruction WI-MSB 
42-120, Revision 4, dated December 20, 2018, Mandatory Service Bulletin 
MSB-42-129, dated May 17, 2017, and Work Instruction WI-OSB 42-131, 
dated December 20, 2017. DAI Work Instruction WI-MSB 42-120, Revision 
3, dated July 6, 2017, and Work Instruction WI-MSB 42-120, Revision 4, 
dated December 20, 2018, have identical procedures for installing 
additional engine exhaust pipe clamps with spring washers on original 
engine exhaust pipes. DAI Work Instruction WI-MSB 42-120, Revision 4, 
dated December 20, 2018, also includes procedures for inspecting the 
original engine exhaust pipe for cracks. DAI Mandatory Service Bulletin 
MSB-42-129, dated May 17, 2017, describes procedures for inspecting the 
modified engine exhaust pipe for cracks. DAI Work Instruction WI-OSB 
42-131, dated December 20, 2017, describes procedures for replacing 
either the original or the modified engine exhaust pipe if cracks are 
found. This service information is reasonably available because the 
interested parties have access to it through their normal course of 
business or by the means identified in the ADDRESSES section of this 
AD.

[[Page 23782]]

FAA's Determination and Requirements of This AD

    This product has been approved by the aviation authority of another 
country, and is approved for operation in the United States. Pursuant 
to our bilateral agreement with this State of Design Authority, they 
have notified us of the unsafe condition described in the MCAI and 
service information referenced above. We are issuing this AD because we 
evaluated all information provided by the State of Design Authority and 
determined the unsafe condition exists and is likely to exist or 
develop on other products of the same type design.

FAA's Determination of the Effective Date

    An unsafe condition exists that requires the immediate adoption of 
this AD. The FAA has found that the risk to the flying public justifies 
waiving notice and comment prior to adoption of this rule because 
affected engine exhaust pipes could crack and cause hot gases to leak 
from fractured exhaust pipes and lead to an uncommanded engine in-
flight shutdown. Therefore, we find good cause that notice and 
opportunity for prior public comment are impracticable. In addition, 
for the reason stated above, we find that good cause exists for making 
this amendment effective in less than 30 days.

Comments Invited

    This AD is a final rule that involves requirements affecting flight 
safety, and we did not precede it by notice and opportunity for public 
comment. We invite you to send any written relevant data, views, or 
arguments about this AD. Send your comments to an address listed under 
the ADDRESSES section. Include ``Docket No. FAA-2018-0188; Directorate 
Identifier 2018-CE-002-AD'' at the beginning of your comments. We 
specifically invite comments on the overall regulatory, economic, 
environmental, and energy aspects of this AD. We will consider all 
comments received by the closing date and may amend this AD because of 
those comments.
    We will post all comments we receive, without change, to http://www.regulations.gov, including any personal information you provide. We 
will also post a report summarizing each substantive verbal contact we 
receive about this AD.

Costs of Compliance

    We estimate that this AD will affect 130 products of U.S. registry.
    We estimate the following costs to comply with this AD:

                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                                     Cost per      Cost on U.S.
              Action                      Labor cost              Parts cost          product        operators
----------------------------------------------------------------------------------------------------------------
Inspect engine exhaust pipe......  2 work-hours x $85 =      N/A................            $170         $22,100
                                    $170.
Install additional engine exhaust  4 work-hours x $85 per    $100 (for both                  440          57,300
 pipe clamps with spring washers.   hour = $340 (for both     clamps).
                                    clamps).
Inspect engine exhaust pipe        2 work-hours x $85 per    N/A................             170          22,100
 clamps.                            hour = $170.
----------------------------------------------------------------------------------------------------------------

    We estimate the following costs to do any necessary replacements 
that will be required based on the results of the inspections. We have 
no way of determining the number of airplanes that may need these 
replacements:

                                               On-Condition Costs
----------------------------------------------------------------------------------------------------------------
                                                                                                     Cost per
                Action                            Labor cost                   Parts cost             product
----------------------------------------------------------------------------------------------------------------
Replace cracked engine exhaust pipe...  4 work-hours x $85 per hour =   $1,900..................  ..............
                                         $340.
Replace cracked engine exhaust pipe     4 work-hours x $85 per hour =   $100 (for both clamps)..            $440
 clamps.                                 $340 (for both clamps).
----------------------------------------------------------------------------------------------------------------

    We estimate that 20 of the affected airplanes have the ``modified 
exhaust pipes,'' Diamond Aircraft Industries P/N D60-9078-06-01_01 or 
Technify P/N 52-7810-H0014 01, installed that may be subject to 
replacement by this AD and 110 of the affected airplanes are subject to 
the initial installation of additional engine exhaust pipe clamps and 
spring washers, inspections, and the conditional replacement 
requirement of this AD.

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.
    This AD is issued in accordance with authority delegated by the 
Executive Director, Aircraft Certification Service, as authorized by 
FAA Order 8000.51C. In accordance with that order, issuance of ADs is 
normally a function of the Compliance and Airworthiness Division, but 
during this transition period, the Executive Director has delegated the 
authority to issue ADs applicable to small airplanes, gliders, 
balloons, airships, domestic business jet transport airplanes, and 
associated appliances to the Director of the Policy and Innovation 
Division.

Regulatory Findings

    We determined that this AD will not have federalism implications 
under Executive Order 13132. This AD 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

[[Page 23783]]

responsibilities among the various levels of government.
    For the reasons discussed above, I certify that this AD:
    (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),
    (3) Will not affect intrastate aviation in Alaska, and
    (4) 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.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, Safety.

Adoption of the Amendment

    Accordingly, under the authority delegated to me by the 
Administrator, the FAA amends 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

0
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]

0
2. The FAA amends Sec.  39.13 by removing Amendment 39-18779 (82 FR 
5359, January 18, 2017), Amendment 39-18907 (82 FR 24843, May 31, 
2017), and Amendment 39-18969 (82 FR 35630, August 1, 2017) and adding 
the following new AD:

2018-10-10 Diamond Aircraft Industries GmbH: Amendment 39-19285; 
Docket No. FAA-2018-0188; Directorate Identifier 2018-CE-002-AD.

(a) Effective Date

    This airworthiness directive (AD) becomes effective June 12, 
2018.

(b) Affected ADs

    This AD replaces 2017-01-12, Amendment 39-18779 (82 FR 5359, 
January 18, 2017) (``AD 2017-01-12''); AD 2017-11-08, Amendment 39-
18907 (82 FR 24843, May 31, 2017) (``AD 2017-11-08''), and AD 2017-
15-09, Amendment 39-18969 (82 FR 35630, August 1, 2017) (``AD 2017-
15-09'').

(c) Applicability

    This AD applies to Diamond Aircraft Industries GmbH Model DA 42 
airplanes, serial numbers 42.004 through 42.427 and 42.AC001 through 
42.AC151, certificated in any category, that have either a TAE 125-
02-99 or TAE 125-02-114 engine installed, and:
    (1) are equipped with an original engine exhaust pipe, Diamond 
Aircraft Industries (DAI) part number (P/N) D60-9078-06-01 or 
Technify P/Ns 52-7810-H0001 02, 52-7810-H0001 03, 52-7810-H0001 04; 
or
    (2) are equipped with a modified engine exhaust pipe DAI P/N 
D60-9078-06-01_01 or Technify 52-7810-H0014 01.

(d) Subject

    Air Transport Association of America (ATA) Code 78: Engine 
Exhaust.

(e) Reason

    This AD was prompted by mandatory continuing airworthiness 
information (MCAI) issued by the aviation authority of another 
country to identify and address an unsafe condition on an aviation 
product. It has been determined that installation of additional 
exhaust pipe brackets, combined with additional inspections, is the 
most adequate solution to address the original unsafe condition, 
while it was also established that the modified exhaust pipes 
without directly attached heat shield are not adequate as 
replacement parts. Durability analysis of the design is still under 
investigation and further improvements in the exhaust design are 
expected. For these reasons, this AD removes the option to install a 
modified exhaust pipe without direct heat shield, adds inspection 
requirements for airplanes modified in accordance with Section III.2 
of Diamond Aircraft Industries (DAI) WI-MSB 42-120 Revision 3, dated 
July 6, 2017 (installation of additional brackets), and for 
airplanes on which an exhaust pipe with directly attached heat 
shield was re-installed in accordance with DAI Work Instruction WI-
OSB 42-131, dated December 20, 2017. The MCAI describes the unsafe 
condition as uncommanded engine shutdown during flight due to 
failure of the propeller regulating valve caused by hot exhaust 
gases coming from fractured engine exhaust pipes. We are issuing 
this AD to prevent failure of the propeller regulating valve, which 
could result in forced landing, consequent damage and occupant 
injury.

(f) Compliance

    Unless already done, do the following actions.
    (1) An airplane is only required to have the actions of either 
(g) or (h) of this AD accomplished depending on the configuration.
    (2) For the purpose of this AD, if the flight hours accumulated 
since first installation of an affected exhaust pipe or additional 
exhaust pipe clamp is not known, use the total hours time-in-service 
(TIS) accumulated on the airplane.

(g) Actions for Airplanes With Installed Original Engine Exhaust Pipes 
as of June 12, 2018 (the Effective Date of This AD)

    See Appendix 1 to AD 2018-10-10 for a chart of required actions. 
An original engine exhaust pipe is defined in paragraph (c), 
Applicability, of this AD.
    (1) At the applicable compliance time in paragraphs (g)(1)(i) 
and (ii) of this AD, and repetitively thereafter at intervals not to 
exceed 500 hours time-in-service (TIS), inspect the installed engine 
exhaust pipe. Do this inspection following section III.4--Inspection 
of exhaust pipe in the INSTRUCTIONS section of DAI Work Instruction 
WI-MSB 42-120, Revision 4, dated December 20, 2017.
    (i) If the engine exhaust pipe has 1,300 hours TIS or less since 
first installed on an airplane as of June 12, 2018 (the effective 
date of this AD): Before or upon accumulating 1,500 hours TIS since 
the engine exhaust pipe was first installed on an airplane, and 
repetitively thereafter at intervals not to exceed 500 hours TIS.
    (ii) If the engine exhaust pipe has more than 1,300 hours TIS 
since first installed on an airplane as of June 12, 2018 (the 
effective date of this AD): Within the next 200 hours TIS after June 
12, 2018 (the effective date of this AD), and repetitively 
thereafter at intervals not to exceed 500 hours time-in-service 
(TIS).
    (2) During any inspection required in paragraph (g)(1) of this 
AD, if the engine exhaust pipe does not pass the inspection 
criteria, before further flight replace the engine exhaust pipe 
following section III.1--Re-installation of Exhaust Pipes with 
Directly Attached Heat Shield in the INSTRUCTIONS section of DAI 
Work Instruction WI-OSB 42-131, dated December 20, 2017 (which 
includes installing additional engine exhaust pipe clamps, an 
exhaust sheet, and incorporates spring washers). After replacement 
continue with the 500-hour TIS repetitive inspections.
    (i) If only the engine exhaust pipe heat shield is loose, a one-
time single weld is allowed following section III.3--Repair of Heat 
Shields of DAI P/N D60-9078-06-01/Technify P/Ns 52-7810-H0001 03 and 
52-7810-H0001 04 in the INSTRUCTIONS section of DAI Work Instruction 
WI-OSB 42-131, dated December 20, 2017. After a repair of the heat 
shield, if a single weld point is subsequently found cracked, the 
heat shield is considered to be loose and the exhaust pipe must be 
replaced. After replacement or repair, continue with the 500-hour 
TIS repetitive inspections.
    (ii) Engine exhaust pipes re-qualified following section III.2--
Re-Qualification of Exhaust Pipes DAI P/N D60-9078-06-01/Technify P/
Ns 52-7810-H0001 02, 52-7810-H0001 03, or 52-7810-H0001 04 in the 
INSTRUCTIONS section of DAI Work Instruction WI-OSB 42-131, dated 
December 20, 2017, are considered to have accumulated 1,500 hours 
TIS.
    (3) Before further flight after the initial inspection required 
in paragraph (g)(1) of this AD and if no cracks were found or a 
repair to the exhaust pipe heat shield was done as required in 
paragraph (g)(2)(i) of this AD, then install additional engine 
exhaust pipe clamps, DAI P/Ns D60-7806-00-01 and D60-7806-00-02, and 
exhaust sheet, P/N D60-7806-00-03, and incorporate spring washers. 
Do the installations following III.2 Action 2--installation of 
additional exhaust clamp in the INSTRUCTIONS section of DAI Work 
Instruction WI-MSB 42-120, Revision 3, dated July 6, 2017, or 
Revision 4, dated December 20, 2017. See figure 1 to paragraph 
(g)(3) of this AD for additional information on the sequence of 
installation actions as identified in DAI Work Instruction WI-MSB 
42-120, Revision 3, dated July 6, 2017 and Revision 4, dated 
December 20, 2017.

[[Page 23784]]

[GRAPHIC] [TIFF OMITTED] TR23MY18.000

    (4) During any engine exhaust pipe clamp and exhaust sheet with 
spring washer installation/replacement required in paragraphs 
(g)(2), (3), (6), and (7) of this AD, if the exhaust clamp assembly 
cannot be installed without side force using step 10 of III.2 Action 
2--installation of additional exhaust clamp in the INSTRUCTIONS 
section of DAI Work Instruction WI-MSB 42-120, Revision 3, dated 
July 6, 2017, or Revision 4, dated December 20, 2017, before further 
flight contact the FAA at the address specified in paragraph (i) of 
this AD to obtain and incorporate an FAA-approved repair/
modification approved specifically for this AD. The FAA will 
coordinate with the European Aviation Safety Agency (EASA) and DAI 
for the development of a repair/modification to address the specific 
problem.
    (5) At the applicable compliance time in paragraphs (g)(5)(i) 
and (ii) of this AD and repetitively thereafter at intervals not to 
exceed 25 hours TIS, remove and inspect each engine exhaust clamp 
for cracks. Do this inspection following III.3 Action 3--Inspection 
of exhaust clamp for cracks of the INSTRUCTIONS section of DAI Work 
Instruction WI-MSB 42-120, Revision 3, dated July 6, 2017, or 
Revision 4, dated December 20, 2017.
    (i) If the engine exhaust pipe clamp has less than 40 hours TIS 
since first installed on an airplane as of June 12, 2018 (the 
effective date of this AD): Before or upon accumulating 50 hours TIS 
since the engine exhaust pipe clamp was first installed on an 
airplane.
    (ii) If the engine exhaust pipe clamp has 40 hours TIS or more 
since first installed on an airplane as of June 12, 2018 (the 
effective date of this AD): Within the next 10 hours TIS after June 
12, 2018 (the effective date of this AD).
    (6) Before further flight after any inspection required in 
paragraph (g)(5) of this AD and no crack is found, reinstall the 
engine exhaust pipe clamp, and incorporate spring washers following 
III.2 Action 2--installation of additional exhaust clamp in the 
INSTRUCTIONS section of DAI Work Instruction WI-MSB 42-120, Revision 
3, dated July 6, 2017, or Revision 4, dated December 20, 2017. See 
figure 1 to paragraph (g)(3) of this AD for additional information 
on the sequence of installation actions as identified in DAI Work 
Instruction WI-MSB 42-120, Revision 3, dated July 6, 2017, and or 
Revision 4, dated December 20, 2017. Continue with the 25-hour TIS 
repetitive inspection as long as no cracks are found.
    (7) Before further flight after any inspection required in 
paragraph (g)(5) of this AD and a cracked engine exhaust pipe clamp 
is found, replace the cracked engine exhaust pipe clamp with a new 
engine exhaust pipe clamp and incorporate spring washers following 
the service instructions specified in paragraph (g)(6) of this AD. 
All newly installed engine exhaust pipe clamps are subject to an 
initial 50-hour TIS and repetitive 25-hour TIS inspections for 
cracks following the service instructions specified in paragraph 
(g)(5) of this AD.

(h) Actions for Airplanes With Installed Modified Engine Exhaust Pipes 
as of June 12, 2018 (the Effective Date of This AD)

    See Appendix 2 to AD 2018-10-10 for a chart of required actions. 
A modified engine exhaust pipe is defined in paragraph (c), 
Applicability, of this AD.
    (1) At the applicable compliance time in paragraphs (h)(1)(i) 
and (ii) of this AD and repetitively thereafter at intervals not to

[[Page 23785]]

exceed 50 hours TIS, inspect each engine exhaust pipe for cracks. Do 
this inspection following I.9 Accomplishment/Instructions in DAI 
Mandatory Service Bulletin MSB-42-129, dated May 17, 2017.
    (i) If the engine exhaust pipe has less than 40 hours TIS since 
first installed on an airplane as of June 12, 2018 (the effective 
date of this AD): Before or upon accumulating 50 hours TIS since the 
affected engine exhaust pipe was first installed on an airplane, 
repetitively thereafter inspect at intervals not to exceed 50 hours 
TIS.
    (ii) If the engine exhaust pipe has 40 hours TIS or more since 
first installed on an airplane as of June 12, 2018 (the effective 
date of this AD): Within the next 10 hours TIS after June 12, 2018 
(the effective date of this AD), repetitively thereafter inspect at 
intervals not to exceed 50 hours TIS.
    (2) If a crack is found during any inspection required by 
paragraph (h)(1) of this AD, before further flight replace the 
engine exhaust pipe with an engine exhaust pipe, DAI P/N D60-9078-
06-01 or Technify P/Ns 52-7810-H0001 02, 52-7810-H0001 03, or 52-
7810-H0001 04. Do the replacement following section III.1--Re-
installation of Exhaust Pipes with Directly Attached Heat Shield in 
the INSTRUCTIONS section of DAI Work Instruction WI-OSB 42-131, 
dated December 20, 2017, which includes installing additional engine 
exhaust pipe clamps, an exhaust sheet, and incorporates spring 
washers.
    (3) After installing an engine exhaust pipe, DAI P/N D60-9078-
06-01 or Technify P/Ns 52-7810-H0001 02, 52-7810-H0001 03, or 52-
7810-H0001 04 (which includes installing additional engine exhaust 
pipe clamps, an exhaust sheet, and incorporates spring washers), 
repetitively thereafter inspect at intervals not to exceed 500 hours 
TIS. Do this inspection following section III.4--Inspection of 
exhaust pipe in the INSTRUCTIONS section of DAI Work Instruction WI-
MSB 42-120, Revision 4, dated December 20, 2017.
    (4) During any inspection required in paragraph (h)(3) of this 
AD, if the engine exhaust pipe does not pass the inspection 
criteria, before further flight replace the engine exhaust pipe 
following section III.1--Re-installation of Exhaust Pipes with 
Directly Attached Heat Shield in the INSTRUCTIONS section of DAI 
Work Instruction WI-OSB 42-131, dated December 20, 2017 (which 
includes installing additional engine exhaust pipe clamps, an 
exhaust sheet, and incorporates spring washers). After replacement, 
continue with the 500-hour TIS repetitive inspections.
    (i) If only the engine exhaust pipe heat shield is loose, a one-
time single weld is allowed following section III.3--Repair of Heat 
Shields of DAI P/N D60-9078-06-01/Technify P/Ns 52-7810-H0001 03 and 
52-7810-H0001 04 in the INSTRUCTIONS section of DAI Work Instruction 
WI-OSB 42-131, dated December 20, 2017. After a repair of the heat 
shield, if a single weld point is subsequently found cracked, the 
heat shield is considered to be loose and the exhaust pipe must be 
replaced. After replacement or repair, continue with the 500-hour 
TIS repetitive inspections.
    (ii) Engine exhaust pipes re-qualified following section III.2--
Re-Qualification of Exhaust Pipes DAI P/N D60-9078-06-01/Technify P/
Ns 52-7810-H0001 02, 52-7810-H0001 03, or 52-7810-H0001 04 in the 
INSTRUCTIONS section of DAI Work Instruction WI-OSB 42-131, dated 
December 20, 2017, are considered to have accumulated 1,500 hours 
TIS.
    (5) During any engine exhaust pipe clamp, exhaust sheet with 
spring washer installation/replacement required in paragraphs 
(h)(2), (4), (7), and (8) of this AD, if the exhaust clamp assembly 
cannot be installed without side force using step 10 of III.2 Action 
2--installation of additional exhaust clamp in the INSTRUCTIONS 
section of DAI Work Instruction WI-MSB 42-120, Revision 3, dated 
July 6, 2017, or Revision 4, dated December 20, 2017, before further 
flight contact the FAA at the address specified in paragraph (i) of 
this AD to obtain and incorporate an FAA-approved repair/
modification approved specifically for this AD. The FAA will 
coordinate with the European Aviation Safety Agency (EASA) and DAI 
for the development of a repair/modification to address the specific 
problem.
    (6) At the applicable compliance time in paragraphs (h)(6)(i) 
and (ii) of this AD and repetitively thereafter at intervals not to 
exceed 25 hours TIS, remove and inspect each engine exhaust clamp 
for cracks. Do this inspection following III.3 Action 3--Inspection 
of exhaust clamp for cracks of the INSTRUCTIONS section of DAI Work 
Instruction WI-MSB 42-120, Revision 3, dated July 6, 2017, or 
Revision 4, dated December 20, 2017.
    (i) If the engine exhaust pipe clamp has less than 40 hours TIS 
since first installed on an airplane as of June 12, 2018 (the 
effective date of this AD): Before or upon accumulating 50 hours TIS 
since the engine exhaust pipe clamp was first installed on an 
airplane.
    (ii) If the engine exhaust pipe clamp has 40 hours TIS or more 
since first installed on an airplane as of June 12, 2018
    (the effective date of this AD): Within the next 10 hours TIS 
after June 12, 2018 (the effective date of this AD).
    (7) Before further flight after any inspection required in 
paragraph (h)(6) of this AD and no crack is found, reinstall the 
engine exhaust pipe clamp and incorporate spring washers following 
III.2 Action 2--installation of additional exhaust clamp in the 
INSTRUCTIONS section of DAI Work Instruction WI-MSB 42-120, Revision 
3, dated July 6, 2017, or Revision 4, dated December 20, 2017. See 
figure 2 to paragraph (g)(7) of this AD for additional information 
on the sequence of installation actions as identified in DAI Work 
Instruction WI-MSB 42-120, Revision 3, dated July 6, 2017, and or 
Revision 4, dated December 20, 2017. Continue with the 25-hour TIS 
repetitive inspection as long as no cracks are found.

[[Page 23786]]

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    (8) Before further flight after any inspection required in 
paragraph (h)(6) of this AD and a cracked engine exhaust pipe clamp 
is found, replace the cracked engine exhaust pipe clamp with a new 
engine exhaust pipe clamp and incorporate spring washers following 
the service instructions specified in paragraph (h)(7) of this AD. 
All newly installed engine exhaust pipe clamps are subject to an 
initial 50-hour TIS and repetitive 25-hour TIS inspections for 
cracks following the service instructions specified in paragraph 
(h)() of this AD.

(i) Other FAA AD Provisions

    The following provisions also apply to this AD:
    (1) Alternative Methods of Compliance (AMOCs): The Manager, 
Standards Office, FAA, has the authority to approve AMOCs for this 
AD, if requested using the procedures found in 14 CFR 39.19. Send 
information to ATTN: Mike Kiesov, Aerospace Engineer, FAA, Small 
Airplane Standards Branch, 901 Locust, Room 301, Kansas City, 
Missouri 64106; telephone: (816) 329-4144; fax: (816) 329-4090; 
email: [email protected]. Before using any approved AMOC on any 
airplane to which the AMOC applies, notify your appropriate 
principal inspector (PI) in the FAA Flight Standards District Office 
(FSDO), or lacking a PI, your local FSDO.
    (2) Airworthy Product: For any requirement in this AD to obtain 
corrective actions from a manufacturer or other source, use these 
actions if they are FAA-approved. Corrective actions are considered 
FAA-approved if they are approved by the State of Design Authority 
(or their delegated agent). You are required to assure the product 
is airworthy before it is returned to service.

(j) Related Information

    Refer to MCAI EASA AD No. 2017-0254, dated December 21, 2017, 
for related information. You may examine the MCAI on the internet at 
http://www.regulations.gov by searching for and locating Docket No. 
FAA-2018-0188.

(k) Material Incorporated by Reference

    (1) The Director of the Federal Register approved the 
incorporation by reference (IBR) of the service information listed 
in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51.
    (2) You must use this service information as applicable to do 
the actions required by this AD, unless this AD specifies otherwise.
    (3) The following service information was approved for IBR on 
June 12, 2018.
    (i) Diamond Aircraft Industries GmbH Work Instruction WI-MSB 42-
120, Revision 4, dated December 20, 2017.
    (ii) Diamond Aircraft Industries GmbH Work Instruction WI-OSB 
42-131, dated December 20, 2017.
    (4) The following service information was approved for IBR on 
May 31, 2017 (82 FR 24843, May 31, 2017).

[[Page 23787]]

    (i) Diamond Aircraft Industries GmbH Mandatory Service Bulletin 
MSB-42-129, dated May 17, 2017.
    (ii) Reserved.
    (5) The following service information was approved for IBR on 
August 1, 2017 (82 FR 35630, August 1, 2017).
    (i) Diamond Aircraft Industries GmbH Work Instruction WI-MSB 42-
120, Revision 3, dated July 6, 2017.
    (ii) Reserved.
    (6) For Diamond Aircraft Industries GmbH service information 
identified in this AD, contact Diamond Aircraft Industries GmbH, 
N.A. Otto-Strasse 5, A-2700 Wiener Neustadt, Austria, telephone: +43 
2622 26700; fax: +43 2622 26780; email: [email protected]; 
internet: http://www.diamondaircraft.com.
    (7) You may view this service information at FAA, Small Airplane 
Branch, 901 Locust, Kansas City, Missouri 64106. For information on 
the availability of this material at the FAA, call (816) 329-4148. 
It is also available on the internet at http://www.regulations.gov 
by searching for locating Docket No. FAA-2018-0188.
    (8) You may view the service information that is incorporated by 
reference at the National Archives and Records Administration 
(NARA). For information on the availability of this material at 
NARA, call 202-741-6030, or go to: http://www.archives.gov/federal-register/cfr/ibr-locations.html.
BILLING CODE 4910-13-P
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[[Page 23788]]

[GRAPHIC] [TIFF OMITTED] TR23MY18.003

    Issued in Kansas City, Missouri, on May 11, 2018.
Melvin J. Johnson,
Aircraft Certification Service, Deputy Director, Policy and Innovation 
Division, AIR-601.
[FR Doc. 2018-10580 Filed 5-22-18; 8:45 am]
 BILLING CODE 4910-13-C