[Federal Register: December 6, 2004 (Volume 69, Number 233)]
[Rules and Regulations]
[Page 70368-70371]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr06de04-3]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. 2003-CE-48-AD; Amendment 39-13886; AD 2004-24-10]
RIN 2120-AA64
Airworthiness Directives; Bombardier, Inc. Model DHC-3 Airplanes
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule.
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SUMMARY: The FAA adopts a new airworthiness directive (AD) for certain
Bombardier, Inc. Model DHC-3 airplanes modified with A.M. Luton's
Supplemental Type Certificate (STC) number SA3777NM. This AD requires
you to inspect the wiring for the heating blankets on P3 and
PY pneumatic lines and the push-to-test function lights to
ensure that they are wired to the correct schematic; replace the
circuit breaker switch as applicable; and replace the flight manual
supplement currently in use with Revision G, dated March 28, 2001
(incorporates Revision I of Sheet 1 of Drawing 20075, ``Electrical
System Schematic,'' dated October 10, 2000). This AD is the result of
mandatory continuing airworthiness information (MCAI) issued by the
airworthiness authority for Canada. We are issuing this AD to detect
and correct wiring installed in accordance with an incorrect drawing,
which shows the pneumatic heating blankets to the P3 and
PY pneumatic lines wired in series with the indicator
lights, rather than parallel. This can result in reduced
[[Page 70369]]
current for the heating blankets and loss of pneumatic line heating,
which can lead to loss of engine power or reverse propeller overspeed
governing protection and ultimately loss of control of the airplane.
DATES: This AD becomes effective on January 6, 2005.
As of January 6, 2005, the Director of the Federal Register
approved the incorporation by reference of certain publications listed
in the regulation.
ADDRESSES: You may get the service information identified in this AD
from A. M. Luton, 3025 Eldridge Avenue, Bellingham, WA 98225.
You may view the AD docket at FAA, Central Region, Office of the
Regional Counsel, Attention: Rules Docket No. 2003-CE-48-AD, 901
Locust, Room 506, Kansas City, Missouri 64106. Office hours are 8 a.m.
to 4 p.m., Monday through Friday, except Federal holidays.
FOR FURTHER INFORMATION CONTACT: Richard Simonson, Aerospace Engineer,
Special Certification Branch; telephone: (425) 917-6507; facsimile:
(425) 917-6590.
SUPPLEMENTARY INFORMATION:
Discussion
What events have caused this AD? Transport Canada, which is the
airworthiness authority for Canada, recently notified FAA that an
unsafe condition may exist on all Bombardier, Inc. Model DHC-3
airplanes modified with an A.M. Luton Supplemental Type Certificate
(STC) number SA3777NM. Transport Canada reports a drawing error on
Revisions G and H of Sheet 1 of the Electrical System Schematic Drawing
20075, which shows the pneumatic heating blankets to the P3
and PY pneumatic lines wired in series with the indicator
lights, rather than parallel. This can result in severely reduced
electrical energy going to the heating blankets with loss of pneumatic
line heating, which can lead to loss of engine power or reverse
propeller overspeed governing protection.
What is the potential impact if FAA took no action? Electrical
installation using incorrect wiring configurations could result in the
electrical energy being absorbed by the light bulbs with insufficient
electrical energy for the heating blankets, which would allow ice to
form in these lines due to condensation even though the indication
lights show the lines being heated. This could result in loss of engine
power or reverse propeller overspeed governing protection and lead to
loss of control of the airplane.
Has FAA taken any action to this point? We issued a proposal to
amend part 39 of the Federal Aviation Regulations (14 CFR part 39) to
include an AD that would apply to certain Bombardier, Inc. Model DHC-3
airplanes modified with A.M. Luton's Supplemental Type Certificate
(STC) number SA3777NM. This proposal was published in the Federal
Register as a notice of proposed rulemaking (NPRM) on May 24, 2004 (69
FR 29477). The NPRM proposed to require you to inspect the wiring for
the heating blankets on P3 and PY pneumatic lines
and the push-to-test function lights to ensure that they are wired to
the correct schematic; replace the circuit breaker switch as
applicable; and replace the flight manual supplement currently in use
with Revision G, dated March 28, 2001 (incorporates Revision I of Sheet
1 of Drawing 20075, ``Electrical System Schematic,'' dated October 10,
2000).
Comments
Was the public invited to comment? We provided the public the
opportunity to participate in developing this AD. We received no
comments on the proposal or on the determination of the cost to the
public.
Conclusion
What is FAA's final determination on this issue? We have carefully
reviewed the available data and determined that air safety and the
public interest require adopting the AD as proposed except for minor
editorial corrections. We have determined that these minor corrections:
Are consistent with the intent that was proposed in the
NPRM for correcting the unsafe condition; and
Do not add any additional burden upon the public than was
already proposed in the NPRM.
Changes to 14 CFR Part 39--Effect on the AD
How does the revision to 14 CFR part 39 affect this AD? On July 10,
2002, the FAA published a new version of 14 CFR part 39 (67 FR 47997,
July 22, 2002), which governs the FAA's AD system. This regulation now
includes material that relates to altered products, special flight
permits, and alternative methods of compliance. This material
previously was included in each individual AD. Since this material is
included in 14 CFR part 39, we will not include it in future AD
actions.
Costs of Compliance
How many airplanes does this AD impact? We estimate that this AD
affects 32 airplanes in the U.S. registry.
What is the cost impact of this AD on owners/operators of the
affected airplanes? We have no way of determining the number of
airplanes that may need the rewiring or circuit breaker switch
replacement. We estimate the following costs to accomplish the
inspection:
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Total cost per Total cost on
Labor cost Parts cost airplane U.S. operators
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1 workhour est. $65 per hour = $65.............................. $100 $165 $5,280
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Regulatory Findings
Will this AD impact various entities? We have 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.
Will this AD involve a significant rule or regulatory action? 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); 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 summary of the costs to comply with this AD and
placed it in the AD Docket. You may get a copy of this summary by
sending a request to us at the address listed under ADDRESSES. Include
``AD Docket No. 2003-CE-48-AD'' in your request.
This rulemaking is promulgated under the authority in Subtitle VII,
Part A, Subpart III, Section 44701, General requirements. Under that
section, the FAA is charged with prescribing minimum standards required
in the
[[Page 70370]]
interest of safety for the design of aircraft. This regulation is
within the scope of that authority since it corrects an unsafe
condition in the design of the aircraft caused by incorrect wiring
configurations that could result in the electrical energy being
absorbed by the light bulbs with insufficient electrical energy for the
heating blankets, which would allow ice to form in these lines due to
condensation even though the indication lights show the lines being
heated.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.
Adoption of the Amendment
0
Accordingly, under 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
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. FAA amends Sec. 39.13 by adding a new AD to read as follows:
2004-24-10 Bombardier, Inc.: Amendment 39-13886; Docket No. 2003-CE-
48-AD.
When Does This AD Become Effective?
(a) This AD becomes effective on January 6, 2005.
What Other ADs Are Affected by This Action?
(b) None.
What Airplanes Are Affected by This AD?
(c) This AD affects the Model DHC-3 airplanes, all serial
numbers, that are:
(1) Modified with STC number SA3777NM; and
(2) Certificated in any category.
What Is the Unsafe Condition Presented in This AD?
(d) This AD is the result of a drawing error on Revisions G and
H of Sheet 1 of Drawing 20075, Electrical System Schematic. The
actions specified in this AD are intended to detect and correct
wiring installed according to an incorrect drawing, which shows the
pneumatic heating blankets to the P3 and PY
pneumatic lines wired in series with the indicator lights, rather
than parallel. This can result in insufficient electrical energy for
the heating blankets and loss of pneumatic heating, which can lead
to loss of engine power or reverse propeller overspeed governing
protection and ultimately loss of control of the airplane.
What Must I Do To Address This Problem?
(e) To address this problem, you must do the following:
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Actions Compliance Procedures
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(1) Inspect the electrical Inspect within 4 Follow the
wiring to the P3 and PY months after procedures in the
engine pneumatic line January 6, 2005 A.M. Luton Service
heating blankets and the P3 (the effective date Information Letter
heater warning light to of this AD) or 300 SIL-00-10-10,
determine if they are wired hours time in revision dated,
in a parallel service (TIS) after March 22, 2001.
configuration. If they are January 6, 2005
not wired in a parallel (the effective date
configuration, they must be of this AD),
rewired. whichever occurs
first. Rewire prior
to further flight
after the
inspection.
(2) Replace Flight Manual Replace within 4 Follow the
Supplement currently in use months after procedures in the
with Revision G, dated January 6, 2005 A.M. Luton Service
March 28, 2001. This flight (the effective date Information Letter
manual revision corrects of this AD) or 300 SIL-00-10-10,
the drawing error on hours TIS after revision dated,
Revisions G and H of Sheet January 6, 2005 March 22, 2001.
1 of the Electrical System (the effective date
Schematic Drawing 20075 by of this AD),
incorporating Revision I of whichever occurs
Sheet 1 of Drawing 20075, first.
``Electrical System
Schematic,'' dated October
10, 2000.
(i) The owner/operator
holding at least a
private pilot
certificate as
authorized by section
43.7 of the Federal
Aviation Regulations
(14 CFR 43.7) may
accomplish the flight
manual replacement
requirement of this AD.
(ii) Make an entry into
the aircraft records
showing compliance with
this portion of the AD
in accordance with
section 43.9 of the
Federal Aviation
Regulations (14 CFR
43.9).
(3) Inspect circuit breaker Inspect within 4 Follow the
switch for heated engine months after procedures in the
pneumatic lines circuit. If January 6, 2005 A.M. Luton Service
an engine is installed that (the effective date Information Letter
uses both P3 and PY heated of this AD), or 300 SIL-00-10-10,
pneumatic lines, circuit hours TIS after revision dated,
breaker switch, Part Number January 6, 2005 March 22, 2001.
(P/N) 20075-3 (5 amp), must (the effective date
be replaced with circuit of this AD),
breaker switch P/N 20075-59 whichever occurs
(7.5 amp). first. Replace
prior to further
flight after the
inspection.
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May I Request an Alternative Method of Compliance?
(f) You may request a different method of compliance or a
different compliance time for this AD by following the procedures in
14 CFR 39.19. Unless FAA authorizes otherwise, send your request to
your principal inspector. The principal inspector may add comments
and will send your request to the Manager, Special Certifications
Branch, Transport Airplane Directorate, FAA. For information on any
already approved alternative methods of compliance, contact Richard
Simonson, Aerospace Engineer, Special Certifications Branch,
Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, WA
98055; telephone: 425-917-6507; facsimile: 816-917-6590.
Does This AD Incorporate Any Material by Reference?
(g) You must do the actions required by this AD following the
instructions in A.M. Luton Service Information Letter SIL-00-10-10,
revision dated March 22, 2001. The Director of the Federal Register
approved the incorporation by reference of this service bulletin in
accordance with 5 U.S.C. 552(a) and 1 CFR part 51. You may get a
copy from
[[Page 70371]]
A.M. Luton, 3025 Eldridge Ave., Bellingham, WA 98225. You may review
copies at FAA, Central Region, Office of the Regional Counsel, 901
Locust, Room 506, Kansas City, Missouri 64106; or 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/code_of_federal_regulations/ibr_locations.html
.
Is There Other Information That Relates to This Subject?
(h) Airworthiness Directive CF-2002-38, dated August 29, 2002,
and Service Information Letter SIL-00-10-10, revision dated March
22, 2001, also pertain to the subject of this AD.
Issued in Kansas City, Missouri, on November 23, 2004.
David A. Downey,
Acting Manager, Small Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 04-26421 Filed 12-3-04; 8:45 am]
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