ADs updated daily
at www.tdatacorp.com (preamble attached)
PROPOSED AD
De Havilland Inc.:
Docket No. 97-CE-70-AD.
(a) What airplanes are affected by this AD? This AD affects
Models DHC-2 Mk. I, DHC-2 Mk. II, and DHC-2 Mk. III airplanes, all
serial numbers, certificated in any category.
(b) Who must comply with this AD? Anyone who wishes to operate
any of the airplanes identified in paragraph (a) of this AD must
comply with this AD.
(c) What problem does this AD address? The actions specified by
this AD are intended to detect and correct corrosion in the mass
balance weights at the elevator tip ribs, which could result in loss
of balance weight during flight and the elevator control surface
separating from the airplane.
(d) What actions must I accomplish to address this problem? To
address this problem, you must accomplish the following:
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Actions Compliance Procedures
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(1) For all affected airplanes: Within the next 6 In accordance with
cut an access hole and install calendar months the
an access cover and ring after the ACCOMPLISHMENT
doubler on the elevator tip rib effective date of INSTRUCTIONS
of each elevator. this AD. section of either
de Havilland
Beaver Service
Bulletin Number 2/
50, dated May 9,
1997 (for Models
DHC-2 Mk. I and
DHC-2 Mk. II
airplanes); or de
Havilland Beaver
fabricate and
Service Bulletin
Number TB/58,
dated May 9, 1997
(for Model DHC-2
Mk. III
airplanes), as
applicable.
(2) For all affected airplanes: Within the next 6 In accordance with
inspect underneath the mass calendar months the
balance weights at each after the ACCOMPLISHMENT
elevator tip rib for corrosion. effective date of INSTRUCTIONS
this AD and section of either
thereafter at de Havilland
intervals not to Beaver Service
exceed 5 years. Bulletin Number 2/
50, dated May 9,
1997 (for Models
DHC-2 Mk. I and
DHC-2 II
airplanes); or de
Havilland Beaver
Service Bulletin
Number TB/58,
dated May 9, 1997
(for Model DHC-2
Mk. III
airplanes), as
applicable.
(3) For all affected airplanes: Prior to further In accordance with
if corrosion is found (during flight after any the
any inspection required by inspection ACCOMPLISHMENT
paragraph (d)(2) of this AD) required in INSTRUCTIONS
that is equal to or less than paragraph d(2) of section of either
0.004 inches depth, remove the this AD where the de Havilland
corrosion. applicable Beaver Service
corrosion is Bulletin Number 2/
found. 50, dated May 9,
1997 (for Models
DHC-2 Mk. I and
DHC-2 Mk. II
airplanes); or de
Havilland Beaver
Service Bulletin
Number TB/58,
dated May 9, 1997
(for Model DHC-2
Mk. III
airplanes), as
applicable.
(4) For all affected airplanes: Prior to further In accordance with
if corrosion is found (during flight after any the
any inspection required by inspection ACCOMPLISHMENT
paragraph (d)(2) of this AD) required in INSTRUCTIONS
that is greater than 0.004 paragraph d(2) of section of either
inches depth, accomplish one of this AD where the de Havilland
the following: applicable Beaver Service
corrosion is Bulletin Number 2/
found. 50, dated May 9,
1997 (for Models
DHC-2 Mk. I and
DHC-2 Mk. II
airplanes); or de
Havilland Beaver
Service Bulletin
Number TB/58,
dated May 9, 1997
(for Model DHC-2
Mk. III
airplanes), as
applicable.
(i) use the procedures in ................
the service bulletin to
manufacture a new tip rib,
part number 2DKC2-TE-77,
and replace the affected
tip rib with this new tip
rib; or.
(ii) replace any affected ................
elevator tip rib with a
part number (P/N) C2-TE-
103AND elevator tip rib.
You may obtain a P/N C2-TE-
103AND elevator tip rib.
You may obtain a P/N C2-TE-
103AND elevator tip rib
from Viking Air Limited,
9574 Hampden Road, Sidney,
BC, Canada VL8 SV5.
(5) In addition to the above for Prior to further In accordance with
the affected DHC-2 MK III flight after any the
airplanes: if corrosion is inspection ACCOMPLISHMENT
found (during any inspection required in INSTRUCTIONS
required by paragraph (d)(2) of paragraph d(2) of section of de
this AD) that is greater than this AD where the Havilland Beaver
0.004 inches depth on the applicable Service Bulletin
channel, accomplish one of the corrosion is Number TB/58,
following: found. dated May 9,
1997.
(i) use the procedures in ................
the service bulletin to
manufacture a new channel
replacement, part number
2DKC2TE1020-13, and replace
the affected channel with
new channel; or.
(ii) replace the channel ................
with a part number (P/N) C2-
TE-89ND channel. You may
obtain a P/N C2-TE-89ND
channel from Viking Air
Limited, 9574 Hampden Road,
Sidney, BC, Canada VL8 SV5.
------------------------------------------------------------------------
(e) Can I comply with this AD in any other way? You may use an
alternative method of compliance or adjust the compliance time if:
(1) Your alternative method of compliance provides an equivalent
level of safety; and
(2) The Manager, New York Aircraft Certification Office (ACO),
approves your alternative. Submit your request through an FAA
Principal Maintenance Inspector, who may add comments and then send
it to the Manager, New York ACO.
Note 1: This AD applies to each airplane identified in paragraph
(a) of this AD, regardless of whether it has been modified, altered,
or repaired in the area subject to the requirements of this AD. For
airplanes that have been modified, altered, or repaired so that the
performance of the requirements of this AD is affected, the owner/
operator must request approval for an alternative method of
compliance in accordance with paragraph (e) of this AD. The request
should include an assessment of the effect of the modification,
alteration, or repair on the unsafe condition addressed by this AD;
and, if you have not eliminated the unsafe condition, specific
actions you propose to address it.
(f) Where can I get information about any already-approved
alternative methods of compliance? Contact Mr. Jon Hjelm, Aerospace
Engineer, New York Aircraft Certification Office, 10 Fifth Street,
3rd Floor, Valley Stream, New York, 11581-1200, telephone: (516)
256-7523, facsimile: (516) 568-2716.
(g) What if I need to fly the airplane to another location to
comply with this AD? The FAA can issue a special flight permit under
sections 21.197 and 21.199 of the Federal Aviation Regulations (14
CFR 21.197 and 21.199) to operate your airplane to a location where
you can accomplish the requirements of this AD.
(h) How do I get copies of the documents referenced in this AD?
You may get copies of the documents referenced in this AD from
Bombardier Inc., Bombardier Regional Aircraft Division, 123 Garratt
Boulevard, Downsview, Ontario, Canada M3K 1Y5. You may view these
documents at FAA, Central Region, Office of the Regional Counsel,
901 Locust, Room 506, Kansas City, Missouri 64106.
Note 2: The subject of this AD is addressed in Canadian AD No.
CF-97-06, dated May 28, 1997.
Issued in Kansas City, Missouri, on February 21, 2002.
Michael Gallagher, Manager, Small Airplane Directorate, Aircraft
Certification Service.
[FR Doc. 02-5004 Filed 3-1-02; 8:45 am]
DATES: The Federal Aviation Administration (FAA) must receive any
comments on this proposed rule on or before March 29, 2002.
PREAMBLE TO THIS AD *************************************************
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. 97-CE-70-AD]
RIN 2120-AA64
Airworthiness Directives; de Havilland Inc. Models DHC-2 Mk. I,
DHC-2 Mk. II, and DHC-2 Mk. III Airplanes
AGENCY: Federal Aviation Administration, DOT.
ACTION: Notice of proposed rulemaking (NPRM).
-----------------------------------------------------------------------
SUMMARY: This document proposes to adopt a new airworthiness directive
(AD) that would apply to certain de Havilland Inc. (de Havilland)
Models DHC-2 Mk. I, DHC-2 Mk. II, and DHC-2 Mk. III airplanes. This
proposed AD would require you to modify the elevator tip rib on each
elevator; repetitively inspect underneath the mass balance weights at
each elevator tip rib for corrosion; and either remove the corrosion or
replace a corroded elevator tip rib depending on the corrosion damage.
This proposed AD is the result of mandatory continuing airworthiness
information (MCAI) issued by the airworthiness authority for Canada.
The actions specified by this proposed AD are intended to detect and
correct corrosion in the mass balance weights at the elevator tip ribs,
which could result in loss of balance weight during flight and the
elevator control surface separating from the airplane.
DATES: The Federal Aviation Administration (FAA) must receive any
comments on this proposed rule on or before March 29, 2002.
ADDRESSES: Submit comments to FAA, Central Region, Office of the
Regional Counsel, Attention: Rules Docket No. 97-CE-70-AD, 901 Locust,
Room 506, Kansas City, Missouri 64106. You may view any comments at
this location between 8 a.m. and 4 p.m., Monday through Friday, except
Federal holidays.
You may get service information that applies to this proposed AD
from Bombardier Inc., Bombardier Regional Aircraft Division, 123
Garratt Boulevard, Downsview, Ontario, Canada M3K 1Y5; telephone: (416)
633-7310. You may also view this information at the Rules Docket at the
address above.
FOR FURTHER INFORMATION CONTACT: Mr. Jon Hjelm, Aerospace Engineer, New
York Aircraft Certification Office, 10 Fifth Street, 3rd Floor, Valley
Stream, New York, 11581-1200, telephone: (516) 256-7523, facsimile:
(516) 568-2716.
SUPPLEMENTARY INFORMATION:
Comments Invited
How Do I Comment on This Proposed AD?
The FAA invites comments on this proposed rule. You may submit
whatever written data, views, or arguments you choose. You need to
include the rule's docket number and submit your comments to the
address specified under the caption ADDRESSES. We will consider all
comments received on or before the closing date. We may amend this
proposed rule in light of comments received. Factual information that
supports your ideas and suggestions is extremely helpful in evaluating
the effectiveness of this proposed AD action and determining whether we
need to take additional rulemaking action.
Are There Any Specific Portions of This Proposed AD I Should Pay
Attention To?
The FAA specifically invites comments on the overall regulatory,
economic, environmental, and energy aspects of this proposed rule that
might suggest a need to modify the rule. You may view all comments we
receive before and after the closing date of the rule in the Rules
Docket. We will file a report in the Rules Docket that summarizes each
contact we have with the public that concerns the substantive parts of
this proposed AD.
How Can I Be Sure FAA Receives My Comment?
If you want FAA to acknowledge the receipt of your comments, you
must include a self-addressed, stamped postcard. On the postcard, write
``Comments to Docket No. 97-CE-70-AD.'' We will date stamp and mail the
postcard back to you.
Discussion
What Events Have Caused This Proposed AD?
Transport Canada, which is the airworthiness authority for Canada,
notified FAA that an unsafe condition may exist on certain de Havilland
Models DHC-2 Mk. I, DHC-2 Mk. II, and DHC-2 Mk. III airplanes.
Transport Canada reports incidents of corrosion found in the area of
the elevator tip rib underneath the mass balance weights on several of
the above-referenced airplanes.
What Are the Consequences if the Condition Is Not Corrected?
These conditions, if not detected and corrected, could result in
loss of balance weight during flight and the elevator control surface
separating from the airplane.
Is There Service Information That Applies to This Subject?
De Havilland has issued Beaver Service Bulletin Number 2/50, dated
May 9, 1997 (applicable to Models DHC-2 Mk. I and DHC-2 Mk. II
airplanes); and Beaver Service Bulletin Number TB/58, dated May 9, 1997
(applicable to Model DHC-2 Mk. III airplanes).
What Are the Provisions of This Service Information?
These service bulletins include procedures for:
--modifying the elevator tip rib on each elevator;
--repetitively inspecting underneath the mass balance weights at the
elevator tip rib for corrosion; and
--either removing the corrosion or replacing the corroded elevator tip
rib depending on the corrosion damage.
What Action Did Transport Canada Take?
Transport Canada classified these service bulletins as mandatory
and issued AD No. CF-97-06, dated May 28, 1997, in order to ensure the
continued airworthiness of these airplanes in Canada.
Was This in Accordance With the Bilateral Airworthiness Agreement?
These airplane models are manufactured in Canada and are type
certificated for operation in the United States under the provisions of
section 21.29 of the Federal Aviation Regulations (14 CFR 21.29) and
the applicable bilateral airworthiness agreement.
Pursuant to this bilateral airworthiness agreement, Transport
Canada has kept FAA informed of the situation described above.
The FAA's Determination and an Explanation of the Provisions of This
Proposed AD
What Has FAA Decided?
The FAA has examined the findings of Transport Canada; reviewed all
available information, including the service information referenced
above; and determined that:
--the unsafe condition referenced in this document exists or could
develop on other de Havilland Models DHC-2 Mk. I, DHC-2 Mk. II, and
DHC-2 Mk. III of the same type design that are on the U.S. registry;
--the actions specified in the previously-referenced service
information should be accomplished on the affected airplanes; and
--AD action should be taken in order to correct this unsafe condition.
What Would This Proposed AD Require?
This proposed AD would require you to modify the elevator tip rib
on each elevator; repetitively inspect underneath the mass balance
weights at the elevator rib tip for corrosion; and either remove the
corrosion or replace the corroded elevator tip rib depending on the
corrosion damage.
Cost Impact
How Many Airplanes Would This Proposed AD Impact?
We estimate that this proposed AD affects 160 airplanes in the U.S.
registry.
What Would Be the Cost Impact of This Proposed AD on Owners/Operators
of the Affected Airplanes?
We estimate the following costs to accomplish the proposed
modification and initial inspection:
----------------------------------------------------------------------------------------------------------------
Total cost per Total cost on
Labor cost Parts cost airplane U.S. operators
----------------------------------------------------------------------------------------------------------------
13 workhours x $60 = $780................... No parts cost required.......... $780 $780 x 160 =
$124,800.
----------------------------------------------------------------------------------------------------------------
These figures only take into account the proposed modification and
initial inspection costs and do not take into account the costs of any
of the proposed repetitive inspections or the cost to replace any
elevator tip rib that would be found corroded past a certain extent. We
have no way of determining the number of repetitive inspections each
owner/operator would incur over the life of each affected airplane or
the number of elevator tip ribs that would need to be replaced.
Compliance Time of This Proposed AD
What Would Be the Compliance Time of This Proposed AD?
The compliance time of this proposed AD is ``within the next 6
calendar months after the effective date of this AD''.
Why Is the Compliance Time Presented in Calendar Time Instead of Hours
Time-in-Service (TIS)?
We have determined that a calendar time compliance is the most
desirable method because the unsafe condition described in this
proposed AD is caused by corrosion. Corrosion develops regardless of
whether the airplane is in service and is not a result of airplane
operation. Therefore, to ensure that the above-referenced condition is
detected and corrected on all airplanes within a reasonable period of
time without inadvertently grounding any airplanes, a compliance
schedule based upon calendar time instead of hours TIS is proposed.
Regulatory Impact
Would This Proposed AD Impact Various Entities?
The regulations proposed herein 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. Therefore, it
is determined that this proposed rule would not have federalism
implications under Executive Order 13132.
Would This Proposed AD Involve a Significant Rule or Regulatory Action?
For the reasons discussed above, I certify that this proposed
action (1) is not a ``significant regulatory action'' under Executive
Order 12866; (2) is not a ``significant rule'' under DOT Regulatory
Policies and Procedures (44 FR 11034, February 26, 1979); and (3) if
promulgated, will not have a significant economic impact, positive or
negative, on a substantial number of small entities under the criteria
of the Regulatory Flexibility Act. A copy of the draft regulatory
evaluation prepared for this action has been placed in the Rules
Docket. A copy of it may be obtained by contacting the Rules Docket at
the location provided under the caption ADDRESSES.
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 Federal Aviation Administration proposes to amend
part 39 of the Federal Aviation Regulations (14 CFR part 39) as
follows:
PART 39--AIRWORTHINESS DIRECTIVES
1. The authority citation for part 39 continues to read as follows:
Authority: 49 U.S.C. 106(g), 40113, 44701.
Sec. 39.13 [Amended]
2. FAA amends Sec. 39.13 by adding a new airworthiness directive
(AD) to read as follows: