Airworthiness Directive 2009-25-03

Airworthiness Directive 2009-25-03

Applicable Manufacturers Service Information:
ZLT Zeppelin Luftschifftechnik GmbH & Co KG Service Bulletin S07 830 0001, Issue B-00, dated
June 29, 2009
Model Applicability:
ZLT Zeppelin Luftschifftechnik GmbH & Co KG Model LZ N07-100 airships
For complete information on this AD, please see:
AD 2009-25-03 FAA Copy
AD 2009-25-03 Preamble
AD 2009-25-03 CFR Copy
Effective Date:
Supersedes:
To address a crack in the bevel gear in the propeller gearbox
ZLT Zeppelin Luftschifftechnik Category:
Airframe
GmbH & Co KG
01/08/2010
Recurring:
No
N/A
Superseded By: N/A
Subject:
Manufacturer:
Airworthiness Directive 2009-25-03 Summary
Summary:
We are adopting a new airworthiness directive (AD) for the products listed above. This AD results
from mandatory continuing airworthiness information (MCAI) issued by an aviation authority of
another country to identify and correct an unsafe condition on an aviation product. The MCAI
describes the unsafe condition as: The manufacturer has advised of receiving a report that during
start up on ground a RH propeller gear box (PGB) on the airship has failed resulting in free
rotation of the propeller. Investigation performed by the manufacturer revealed that the bevel gear
in the propeller gearbox had cracked near the hub area. During an extensive metallurgical
investigation of the cracked bevel gear some different manufacturing deviations outside of the
specifications were detected. Deviations in the heat treatment, wall thickness of the bevel gear
near the hub area, and score marks caused during the production process have been established
as causal factors for this failure. We are issuing this AD to require actions to correct the unsafe
condition on these products.

FOR FURTHER INFORMATION CONTACT: Karl
Schletzbaum, Aerospace Engineer, FAA,
Small Airplane Directorate, 901 Locust,
Room 301, Kansas City, Missouri 64106;
telephone: (816) 329¨C4146; fax: (816)
329¨C4090; e-mail:
This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
You may obtain further information by
examining the MCAI in the AD docket.
SUMMARY: We are adopting a new
airworthiness directive (AD) for the
products listed above. This AD results
from mandatory continuing
airworthiness information (MCAI)
issued by an aviation authority of
another country to identify and correct
an unsafe condition on an aviation
product. The MCAI describes the unsafe
condition as:
The manufacturer has advised of receiving
a report that during start up on ground a RH
propeller gear box (PGB) on the airship has
failed resulting in free rotation of the
propeller. Investigation performed by the
manufacturer revealed that the bevel gear in
the propeller gearbox had cracked near the
hub area.
During an extensive metallurgical
investigation of the cracked bevel gear some
different manufacturing deviations outside of
the specifications were detected. Deviations
in the heat treatment, wall thickness of the
bevel gear near the hub area, and score marks
caused during the production process have
been established as causal factors for this
failure.
We are issuing this AD to require
actions to correct the unsafe condition
on these products.
DATES: This AD becomes effective
January 8, 2010.
We issued a notice of proposed
rulemaking (NPRM) to amend 14 CFR
part 39 to include an AD that would
apply to the specified products. That
NPRM was published in the Federal
Register on September 21, 2009 (74 FR
48019). That NPRM proposed to correct
an unsafe condition for the specified
products. The MCAI states:
The manufacturer has advised of receiving
a report that during start up on ground a RH
propeller gear box (PGB) on the airship has
failed resulting in free rotation of the
propeller. Investigation performed by the
manufacturer revealed that the bevel gear in
the propeller gearbox had cracked near the
hub area.
During an extensive metallurgical
investigation of the cracked bevel gear some
different manufacturing deviations outside of
the specifications were detected. Deviations
in the heat treatment, wall thickness of the
bevel gear near the hub area, and score marks
caused during the production process have
been established as causal factors for this
failure.
For the reasons described above, this new
AD mandates the replacement of the affected
bevel gears, and limits, as a temporary
measure, their service-life to 1,000 Flight
Hours (for non-refurbished PGBs) and to
1,600 Flight Hours (for refurbished PGBs).
63583
Federal Register / Vol. 74, No. 232 / Friday, December 4, 2009 / Rules and Regulations
On January 8, 2010, the Director of the
Federal Register approved the
incorporation by reference of certain
publications listed in this AD.
ADDRESSES: You may examine the AD
docket on the Internet at
http://www.regulations.gov or in person
at Document Management Facility, U.S.
Department of Transportation, Docket
Operations, M¨C30, West Building
Ground Floor, Room W12¨C140, 1200
New Jersey Avenue, SE., Washington,
DC 20590.
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
Frm 00053 Fmt 4700 Sfmt 4700 E:FRFM4DER1.SGM 04DER1
[Docket No. FAA¨C2009¨C0868; Directorate
Identifier 2009¨CCE¨C047¨CAD; Amendment
39¨C16120; AD 2009¨C25¨C03]
RIN 2120¨CAA64
Airworthiness Directives; ZLT Zeppelin
Luftschifftechnik GmbH & Co KG
Model LZ N07¨C100 Airships
SUPPLEMENTARY INFORMATION:
AGENCY: Federal Aviation
Administration (FAA), Department of
Transportation (DOT).
ACTION: Final rule.
Discussion

Reason
(e) The mandatory continuing
airworthiness information (MCAI) states:
The manufacturer has advised of receiving
a report that during start up on ground a RH
propeller gear box (PGB) on the airship has
failed resulting in free rotation of the
propeller. Investigation performed by the
manufacturer revealed that the bevel gear in
the propeller gearbox had cracked near the
hub area.
During an extensive metallurgical
investigation of the cracked bevel gear some
different manufacturing deviations outside of
the specifications were detected. Deviations
in the heat treatment, wall thickness of the
bevel gear near the hub area, and score marks
caused during the production process have
been established as causal factors for this
failure.
For the reasons described above, this new
AD mandates the replacement of the affected
bevel gears, and limits, as a temporary
measure, their service-life to 1 000 Flight
Hours (for non-refurbished PGBs) and to 1
600 Flight Hours (for refurbished PGBs).
07 722 0003¨C
200.
RH propeller
gear box.
Costs of Compliance
We estimate that this AD will affect 1
product of U.S. registry. We also
estimate that it will take about 18 work-
hours per product to comply with the
basic requirements of this AD. The
average labor rate is $80 per work-hour.
Required parts will cost about $66,488
per gear box replacement. Where the
service information lists required parts
costs that are covered under warranty,
we have assumed that there will be no
charge for these costs. As we do not
control warranty coverage for affected
parties, some parties may incur costs
higher than estimated here.
Based on these figures, we estimate
the cost of this AD on U.S. operators to
be $67,928 per gear box replacement.
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
Subject
(d) Air Transport Association of America
(ATA) Code 65: Tail Rotor Drive.
Examining the AD Docket
VerDate Nov<24>2008 19:31 Dec 03, 2009 Jkt 220001 PO 00000 Frm 00054 Fmt 4700 Sfmt 4700 E:FRFM4DER1.SGM 04DER1
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation
safety, Incorporation by reference,
Safety.
Adoption of the Amendment
¡ö Accordingly, under the authority
delegated to me by the Administrator,
the FAA amends 14 CFR part 39 as
follows:
Actions and Compliance
(f) Unless already done, do the following
actions in accordance with ZLT Zeppelin
Luftschifftechnik GmbH & Co KG Service
Bulletin S07 830 0001, Issue B¨C00, dated
June 29, 2009:
(1) As of January 8, 2010 (the effective date
of this AD), before the accumulation of the
PART 39¡ªAIRWORTHINESS
DIRECTIVES
¡ö 1. The authority citation for part 39
continues to read as follows:
Authority: 49 U.S.C. 106(g), 40113, 44701.
You may examine the AD docket on
the Internet at http://
www.regulations.gov; or in person at the
Docket Management Facility between 9
a.m. and 5 p.m., Monday through
Friday, except Federal holidays. The AD
docket contains the NPRM, the
regulatory evaluation, any comments
received, and other information. The
street address for the Docket Office
(telephone (800) 647¨C5527) is in the
ADDRESSES section. Comments will be
available in the AD docket shortly after
receipt.
63584
Federal Register / Vol. 74, No. 232 / Friday, December 4, 2009 / Rules and Regulations
Comments
We gave the public the opportunity to
participate in developing this AD. We
received no comments on the NPRM or
on the determination of the cost to the
public.
Conclusion
We reviewed the available data and
determined that air safety and the
public interest require adopting the AD
as proposed.
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.
¡ì 39.13 [Amended]
¡ö 2. The FAA amends ¡ì 39.13 by adding
the following new AD:
2009¨C25¨C03 ZLT Zeppelin
Luftschifftechnik GmbH & Co KG:
Amendment 39¨C16120; Docket No.
FAA¨C2009¨C0868; Directorate Identifier
2009¨CCE¨C047¨CAD.
Regulatory Findings
Effective Date
(a) This airworthiness directive (AD)
becomes effective January 8, 2010.
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
responsibilities among the various
levels of government.
For the reasons discussed above, I
certify this AD:
(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.
We prepared a regulatory evaluation
of the estimated costs to comply with
this AD and placed it in the AD Docket.
Affected ADs
(b) None.
Differences Between This AD and the
MCAI or Service Information
We have reviewed the MCAI and
related service information and, in
general, agree with their substance. But
we might have found it necessary to use
different words from those in the MCAI
to ensure the AD is clear for U.S.
operators and is enforceable. In making
these changes, we do not intend to differ
substantively from the information
provided in the MCAI and related
service information.
We might also have required different
actions in this AD from those in the
MCAI in order to follow FAA policies.
Any such differences are highlighted in
a Note within the AD.
Applicability
(c) This AD applies to Model LZ N07¨C100
airships, serial numbers 002, 003, and 004,
that are certificated in any category and are
equipped with the following propeller gear
boxes:
Part No.
Serial No.
Designation
07 722 0001¨C
200.
103, 106,
109, 112,
401, 401.
101, 104,
107, 110,
201.
102, 105,
108, 111,
301, 302.
AFT propeller
gear box.
07 722 0002¨C
200.
LH propeller
gear box.

VerDate Nov<24>2008 17:09 Dec 03, 2009 Jkt 220001 PO 00000 Frm 00055 Fmt 4700 Sfmt 4700
Issued in Kansas City, Missouri, on
November 20, 2009.
Margaret Kline,
Acting Manager, Small Airplane Directorate,
Aircraft Certification Service.
[FR Doc. E9¨C28558 Filed 12¨C3¨C09; 8:45 am]
BILLING CODE 4910¨C13¨CP
63585
Federal Register / Vol. 74, No. 232 / Friday, December 4, 2009 / Rules and Regulations
applicable total hours time-in-service (TIS) as
defined in the appendix of ZLT Zeppelin
Luftschifftechnik GmbH & Co KG Service
Bulletin S07 830 0001, Issue B¨C00, dated
June 29, 2009, replace the bevel gears of the
propeller gearbox.
(2) As of January 8, 2010 (the effective date
of this AD), for airships with a propeller gear
box identified in paragraph (c)(1) of this AD
that have exceeded the applicable total hours
TIS as defined in the appendix of ZLT
Zeppelin Luftschifftechnik GmbH & Co KG
Service Bulletin S07 830 0001, Issue B¨C00,
dated June 29, 2009, replace the bevel gears
of the propeller gearbox within the next 30
days after January 8, 2010 (the effective date
of this AD).
(3) As of January 8, 2010 (the effective date
of this AD), airships with a propeller gear box
S/N 102, 107, 108, 109, or 112, contact the
manufacturer at ZLT Zeppelin
Luftschifftecnik GmbH & Co KG, 88046
Friedrichsfafen, Allmannsweilerstrasse 132,
Germany; telephone: + 49 (0) 7541¨C5900¨C
546; fax: + 40 (0) 7541¨C5900¨C516, to obtain
a repair scheme within the next 30 days after
January 8, 2010 (the effective date of this
AD). Incorporate the repair scheme before
further flight after receipt.
(4) After doing the replacements required
in paragraphs (f)(1), (f)(2), and (f)(3) of this
AD, replace the bevel gears of the propeller
gearbox thereafter at intervals not to exceed
1,600 hours TIS on the propeller gearbox.
Note 1: The time between overhaul for gear
boxes specified in the airship maintenance
manual remains unchanged.
(3) Reporting Requirements: For any
reporting requirement in this AD, under the
provisions of the Paperwork Reduction Act
(44 U.S.C. 3501 et seq.), the Office of
Management and Budget (OMB) has
approved the information collection
requirements and has assigned OMB Control
Number 2120¨C0056.
Related Information
(h) Refer to MCAI European Aviation
Safety Agency (EASA) AD No. 2009¨C0182,
dated August 20, 2009; and ZLT Zeppelin
Luftschifftechnik GmbH & Co KG Service
Bulletin S07 830 0001, Issue B¨C00, dated
June 29, 2009, for related information.
Material Incorporated by Reference
(i) You must use ZLT Zeppelin
Luftschifftechnik GmbH & Co KG Service
Bulletin S07 830 0001, Issue B¨C00, dated
June 29, 2009, to do the actions required by
this AD, unless the AD specifies otherwise.
(1) The Director of the Federal Register
approved the incorporation by reference of
this service information under 5 U.S.C.
552(a) and 1 CFR part 51.
(2) For service information identified in
this AD, contact ZLT Zeppelin
Luftschifftecnik GmbH & Co KG, 88046
Friedrichsfafen, Allmannsweilerstrasse 132,
Germany; telephone: + 49 (0) 7541¨C5900¨C
546; fax: + 40 (0) 7541¨C5900¨C516; Internet:
http://www.zeppelinflug.de/.
(3) You may review copies of the service
information incorporated by reference for
this AD at the FAA, Central Region, Office of
the Regional Counsel, 901 Locust, Kansas
City, Missouri 64106. For information on the
availability of this material at the Central
Region, call (816) 329¨C3768.
(4) You may also review copies of the
service information incorporated by reference
for this AD at the National Archives and
Records Administration (NARA). For
information on the availability of this
material at NARA, call (202) 741¨C6030, or go
to: http://www.archives.gov/federal_register/
code_of_federal_regulations/
ibr_locations.html.
Note 2: Airships with a propeller gear box
S/N 102, 107, 108, 109, or 112 have exceeded
their life limit and are not eligible for bevel
gear replacement. See paragraph (f)(3) of this
AD.
FAA AD Differences
Note 3: This AD differs from the MCAI
and/or service information as follows: No
differences.
Other FAA AD Provisions
(g) 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: Karl Schletzbaum, Aerospace
Engineer, FAA, Small Airplane Directorate,
901 Locust, Room 301, Kansas City, Missouri
64106; telephone: (816) 329¨C4146; fax: (816)
329¨C4090; email: This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
Before using any approved AMOC on any
airship 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.

Dan Weiler
Executive Director of the Cessna Owner Organization
(715) 445-5000, ext. 116
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Daniel
Executive Director
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