AD 2004-24-08 - Airworthiness Directives; Bell Helicopter Textron Canada Model 206A, B, L, L-...

Type	Manufacturer	Model	Details
aircraft	Textron	206A	Airworthiness Directives; Bell Helicopter Textron Canada Model 206A, B, L, L-1, L-3, and L-4 Helicopters
aircraft	Bell	206A	Airworthiness Directives; Bell Helicopter Textron Canada Model 206A, B, L, L-1, L-3, and L-4 Helicopters

Unsafe Condition

Skin cracks originating near the blade trailing edge balance weight, leading to a loss of the weight and a strip of material along the trailing edge, causing an imbalance and fracture of tail rotor gearbox attachment bolts, which could result in blade failure and subsequent loss of control of the helicopter.

AI-generated summary from the source AD text. Verify against the official source before acting.

Required Actions

Inspect each tail rotor blade for deformation, cracks, and bent or deformed weights using a 10X or higher magnifying glass. Replace any blade found with a deformation, crack, or bent/deformed weight with an airworthy blade before further flight. Perform inspections at intervals not exceeding 12 hours time-in-service (TIS), or at 24-hour intervals with additional 3-hour TIS checks between inspections.

AI-generated summary from the source AD text. Verify against the official source before acting.

Compliance Time

Before further flight

AI-generated summary from the source AD text. Verify against the official source before acting.

Affected Aircraft

Bell Helicopter Textron Canada Model 206A, B, L, L-1, L-3, and L-4 helicopters with certain blade part numbers and serial numbers.

AI-generated summary from the source AD text. Verify against the official source before acting.

Federal Register Abstract

This amendment adopts a new airworthiness directive (AD) for the specified Bell Helicopter Textron Canada (BHTC) model helicopters. This action requires an initial inspection and, at specified intervals, certain repetitive checks and inspections of the tail rotor blade (blade) for a deformation, a crack, and a bent or deformed tail rotor weight (weight). Also, this action requires, before further flight, replacing each blade with an airworthy blade if a deformation, a crack, or a bent or deformed weight is found. This amendment is prompted by three reports of skin cracks originating near the blade trailing edge balance weight. This condition, if not detected, could result in blade failure and subsequent loss of control of the helicopter.

Document Text

Show stored source text (verify against official source)

[Federal Register Volume 69, Number 230 (Wednesday, December 1, 2004)]
[Rules and Regulations]
[Pages 69810-69814]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 04-26425]

[[Page 69810]]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 2004-SW-12-AD; Amendment 39-13884; AD 2004-24-08]
RIN 2120-AA64

Airworthiness Directives; Bell Helicopter Textron Canada Model
206A, B, L, L-1, L-3, and L-4 Helicopters

AGENCY: Federal Aviation Administration, DOT.

ACTION: Final rule; request for comments.

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

SUMMARY: This amendment adopts a new airworthiness directive (AD) for
the specified Bell Helicopter Textron Canada (BHTC) model helicopters.
This action requires an initial inspection and, at specified intervals,
certain repetitive checks and inspections of the tail rotor blade
(blade) for a deformation, a crack, and a bent or deformed tail rotor
weight (weight). Also, this action requires, before further flight,
replacing each blade with an airworthy blade if a deformation, a crack,
or a bent or deformed weight is found. This amendment is prompted by
three reports of skin cracks originating near the blade trailing edge
balance weight. This condition, if not detected, could result in blade
failure and subsequent loss of control of the helicopter.

DATES: Effective December 16, 2004.
Comments for inclusion in the Rules Docket must be received on or
before January 31, 2005.

ADDRESSES: Submit comments in triplicate to the Federal Aviation
Administration (FAA), Office of the Regional Counsel, Southwest Region,
Attention: Rules Docket No. 2004-SW-12-AD, 2601 Meacham Blvd., Room
663, Fort Worth, Texas 76137. You may also send comments electronically
to the Rules Docket at the following address: <a href="/cdn-cgi/l/email-protection#457c68243632682421262a2828202b3136052324246b222a33"><span class="__cf_email__" data-cfemail="a59c88c4d6d288c4c1c6cac8c8c0cbd1d6e5c3c4c48bc2cad3">[email&#160;protected]</span></a>.

FOR FURTHER INFORMATION CONTACT: Sharon Miles, Aviation Safety
Engineer, FAA, Rotorcraft Directorate, Regulations and Guidance Group,
Fort Worth, Texas 76193-0111, telephone (817) 222-5122, fax (817) 222-
5961.

SUPPLEMENTARY INFORMATION: This amendment adopts a new AD for the
specified BHTC model helicopters. This action requires an initial
inspection and certain repetitive checks and inspections of the blade,
at specified intervals, for a deformation, a crack, and a bent or
deformed weight. Also, this action requires, before further flight,
replacing each blade with an airworthy blade if a deformation, a crack,
or a bent or deformed weight is found. This amendment is prompted by
three reports of skin cracks originating near the blade trailing edge
balance weight. In two reports, a loss of the weight and a strip of
material along the trailing edge led to an imbalance and fracture of
three of the four tail rotor gearbox attachment bolts. In one of these
incidents the gearbox shifted resulting in failure of the drive shaft
and loss of yaw control. This condition, if not detected, could result
in blade failure and subsequent loss of control of the helicopter.
BHTC has issued Alert Service Bulletin No. 206-04-100 for Model
206A and B and No. 206L-04-127 for Model 206L series helicopters, both
Revision B, both dated May 28, 2004. These service bulletins specify
checking and inspecting the blades for a deformation, a crack, and a
bent or deformed weight and a one-time inspection by Rotor Blades Inc.
in Louisiana, USA, and if the blades pass the one-time inspection,
adding a ``V'' at the end of the serial number. The service bulletins
also specify replacing any blade with a deformation, a crack, or bent
or deformed weight.
Transport Canada, the airworthiness authority for Canada, notified
the FAA that an unsafe condition may exist on these helicopter models.
Transport Canada advises of three reports of skin cracks originating
near the blade trailing edge balance weight. Two of the occurrences
caused a loss of the weight and a strip of material along the trailing
edge leading to an imbalance, which caused the fracture of three of the
four tail rotor gearbox attachments. One of these occurrences resulted
in the gearbox shifting that caused failure of the drive shaft and
resulting loss of yaw control. Transport Canada classified the alert
service bulletins as mandatory and issued AD No. CF-2004-05R1, dated
June 28, 2004, to ensure the continued airworthiness of these
helicopters in Canada.
These helicopter models are manufactured in Canada and are type
certificated for operation in the United States under the provisions of
14 CFR 21.29 and the applicable bilateral agreement. Pursuant to the
applicable bilateral agreement, Transport Canada has kept the FAA
informed of the situation described above. The FAA has examined the
findings of Transport Canada, reviewed all available information, and
determined that AD action is necessary for products of these type
designs that are certificated for operation in the United States.
This unsafe condition is likely to exist or develop on other
helicopters of the same type designs registered in the United States.
Therefore, the FAA is issuing this AD to detect a blade with a
deformation, a crack, or a bent or deformed weight and to prevent blade
failure and subsequent loss of control of the helicopter. This AD
requires the following for the specified BHTC helicopters with certain
blade part numbers and serial numbers:
<bullet> Before further flight, unless accomplished previously, and
before installing any blade with an affected part number and serial
number, cleaning the blade. Then, using a 10X or higher magnifying
glass, inspecting both sides of each blade for a deformation, a crack,
and a bent or deformed weight.
<bullet> Thereafter, cleaning both sides of each blade and using a
10X or higher magnifying glass, inspecting for a deformation, a crack,
and a bent or deformed weight as follows:
[cir] At intervals not to exceed 12 hours time-in-service (TIS), or
[cir] At intervals not to exceed 24 hours TIS and checking both
sides of each blade for a deformation, a crack, and a bent or deformed
weight at intervals not to exceed 3 hours TIS between inspections. An
owner/operator (pilot) may perform the 3-hour TIS check for deformed or
cracked blades and for bent or deformed weights. Pilots may perform
these checks because they require no tools, can be done by observation,
and can be done equally well by a pilot or a mechanic. However, the
pilot must enter compliance with these requirements into the helicopter
maintenance records by following 14 CFR 43.11 and 91.417(a)(2)(v).
<bullet> Before further flight, replacing each blade with an
airworthy blade if you find a deformation, a crack, or a bent or
deformed weight.
The short compliance time involved is required because the
previously described critical unsafe condition can adversely affect the
controllability and structural integrity of the helicopter. Therefore,
inspecting the blade, for a deformation, a crack, and a bent or
deformed weight is required before further flight and at short
specified time intervals, and this AD must be issued immediately.
Since a situation exists that requires the immediate adoption of
this regulation, it is found that notice and opportunity for prior
public comment hereon are impracticable, and that good cause exists for
making this amendment effective in less than 30 days.
The FAA estimates that this AD will:
<bullet> Affect 2194 helicopters.

[[Page 69811]]

<bullet> Take about \1/4\ work hour for a blade check or inspection
and 3 work hours to replace one blade at an average labor rate of $65
per work hour.
<bullet> Required parts will cost about $5,848 per helicopter. (The
service bulletin states that warranty credit will be given based on
hour usage on the blade with remaining life hours and other
restrictions.) Based on these figures, the total estimated cost impact
of the AD on U.S. operators is $21,315,807, assuming 226 checks or
inspections and replacing one blade on each helicopter in the fleet.

Comments Invited

Although this action is in the form of a final rule that involves
requirements affecting flight safety and, thus, was not preceded by
notice and an opportunity for public comment, comments are invited on
this rule. Interested persons are invited to comment on this rule by
submitting such written data, views, or arguments as they may desire.
Communications should identify the Rules Docket number and be submitted
in triplicate to the address specified under the caption ADDRESSES. All
communications received on or before the closing date for comments will
be considered, and this rule may be amended in light of the comments
received. Factual information that supports the commenter's ideas and
suggestions is extremely helpful in evaluating the effectiveness of the
AD action and determining whether additional rulemaking action would be
needed.
Comments are specifically invited on the overall regulatory,
economic, environmental, and energy aspects of the rule that might
suggest a need to modify the rule. All comments submitted will be
available in the Rules Docket for examination by interested persons. A
report that summarizes each FAA-public contact concerned with the
substance of this AD will be filed in the Rules Docket.
Commenters wishing the FAA to acknowledge receipt of their mailed
comments submitted in response to this rule must submit a self-
addressed, stamped postcard on which the following statement is made:
``Comments to Docket No. 2004-SW-12-AD.'' The postcard will be date
stamped and returned to the commenter.
The regulations adopted herein 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. Therefore, it
is determined that this final rule does not have federalism
implications under Executive Order 13132.
The FAA has determined that this regulation is an emergency
regulation that must be issued immediately to correct an unsafe
condition in aircraft, and that it is not a ``significant regulatory
action'' under Executive Order 12866. It has been determined further
that this action involves an emergency regulation under DOT Regulatory
Policies and Procedures (44 FR 11034, February 26, 1979). If it is
determined that this emergency regulation otherwise would be
significant under DOT Regulatory Policies and Procedures, a final
economic evaluation will be prepared and placed in the Rules Docket. A
copy of it, if filed, may be obtained from 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.

Adoption of the Amendment

Accordingly, pursuant to 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. Section 39.13 is amended by adding a new airworthiness directive to
read as follows:

2004-24-08 Bell Helicopter Textron Canada: Amendment 39-13884.
Docket No. 2004-SW-12-AD.

Applicability: Model 206A, B, L, L-1, L-3, and L-4 helicopters,
with a tail rotor blade (blade) with the following part number (P/N)
and serial number (S/N) installed, certificated in any category.

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

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Model 206A & B; Blade, P/N 206-016- Model 206A, B, L, L-1, L-3, & L-4, Blade, P/N 206-016-201-131, S/N with
201-133, S/N with prefix ``CS'' and prefix ``CS'' and no ``V'' suffix
no ``V'' suffix
-------------------------------------
1381 through 1442 7000 through 7018 10174 through 10218.
1492 through 1517 7020 through 7043 10220.
1520 through 1542 7045 through 7050 10232.
1550 7052 through 7132 10235.
1556 7134 through 7246 10237 through 10241.
1560 7248 through 7270 10244.
1562 7272 through 7277 10245.
1564 through 1567 7279 through 7339 10248.
1569 through 1606 7342 through 7368 10250 through 10264.
1609 7784 10266 through 10268.
1611 7786 10270 through 10274.
1612 7788 10276 through 10278.
1614 through 1631 7790 through 7796 10280 through 10282.
1633 through 1675 7798 through 7819 10284 through 10292.
1677 7821 through 7833 10296.
1678 7835 through 7839 10300 through 10330.
1680 through 1682 7841 through 8001 10332.
1684 through 1787 8003 through 8026 10333.
1789 through 1803 8029 through 8061 10335 through 10347.
1810 through 1812 8064 through 8117 10349.
1814 8119 10351 through 10359.
1816 8121 through 8139 10363 through 10365.

[[Page 69812]]

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Model 206A & B; Blade, P/N 206-016- Model 206A, B, L, L-1, L-3, & L-4, Blade, P/N 206-016-201-131, S/N with
201-133, S/N with prefix ``CS'' and prefix ``CS'' and no ``V'' suffix
no ``V'' suffix
-------------------------------------
1820 8142 through 8176 10367.
1823 through 1831 8178 through 8262 10373.
1834 through 1836 8264 through 8294 10374.
1838 8298 through 8368 10377 through 10385.
1840 through 1844 8370 through 8375 10387 through 10408.
1846 8378 through 8416 10410.
1848 through 1882 8419 10414 through 10417.
1884 through 1887 8421 10419 through 10427.
1889 through 1893 8425 through 8428 10430.
1896 through 1898 8430 through 8438 10432.
1900 8440 10437.
1904 8441 10438.
1909 through 1912 8443 10442 through 10445.
1915 8445 through 8447 10458 through 10466.
1916 8449 through 8606 10469.
1919 through 1921 8608 through 8622 10470.
1924 8624 through 8626 10474.
1928 through 1931 8628 through 8632 10476 through 10478.
1933 8635 through 8653 10480 through 10487.
1934 through 1939 8655 through 8686 10489 through 10491.
1943 8690 10493 through 10495.
1945 8692 through 8700 10497 through 10503.
1947 8703 through 8715 10505 through 10588.
1948 8717 through 8722 10591 through 10606.
1952 through 1957 8724 through 8742 10608 through 10610.
1960 8745 through 8828 10612 through 10620.
1962 through 1965 8830 through 8835 10623.
8838 through 8840 10624.
8842 through 8881 10631 through 10655.
8883 through 9032 10657 through 10669.
9034 through 9139 10672.
9141 through 9198 10673.
9200 10676 through 10678.
9202 through 9302 10680 through 10683.
9304 through 9339 10685.
9341 through 9371 10687.
9373 through 9411 10689 through 10702.
9413 10707.
9415 through 9417 10712.
9419 through 9496 10715.
9498 through 9585 10730.
9587 through 9594 10732 through 10734.
9596 through 9618 10736.
9621 through 9629 10738.
9632 through 9642 10739.
9645 through 9651 10746.
9653 through 9673 10750.
9675 through 9707 10756.
9709 through 9724 10760.
9727 through 9731 10761.
9733 through 9735 10765.
9737 through 9739 10770.
9741 through 9748 10774 through 10776.
9751 through 9785 10778.
9787 10781.
9788 10783 through 10785.
9790 through 9792 10792.
9795 through 9847 10794.
9849 through 9928 10798.
9930 through 9937 10799.
9940 through 9942 10806 through 10808.
9944 through 9952 10811.
9955 through 9972 10814 through 10822.
9974 through 9989 10824.
9991 through 9995 10825.
9997 through 10004 10829.
10006 through 10009 10831.
10011 10917.

[[Page 69813]]

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Model 206A & B; Blade, P/N 206-016- Model 206A, B, L, L-1, L-3, & L-4, Blade, P/N 206-016-201-131, S/N with
201-133, S/N with prefix ``CS'' and prefix ``CS'' and no ``V'' suffix
no ``V'' suffix
-------------------------------------
10013 through 10018 10923.
10021 through 10030 10931.
10034 10936.
10036 through 10057 10937.
10061 through 10082 10940.
10090 through 10092 10943.
10094 through 10100 10945.
10116 10947.
10119 10948.
10121 10964.
10123 through 10134 10965.
10136 through 10140 10973.
10142 through 10144 10982.
10146 through 10172 10985.
.................................... 10986.
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Compliance: Required as indicated.
To prevent blade failure and subsequent loss of control of the
helicopter, do the following:
(a) Before further flight, unless accomplished previously, and
before installing any blade with a P/N and S/N listed in the
applicability section of this AD, clean the blade. Using a 10X or
higher magnifying glass, inspect both sides of each blade for a
deformation, a crack, and a bent or deformed weight in the area shown
in Figure 1 of this AD.

Note 1: Paint irregularities on the blade may indicate a crack.

[GRAPHIC] [TIFF OMITTED] TR01DE04.000

[[Page 69814]]

(b) After doing paragraph (a) of this AD, at the following
intervals, clean both sides of each blade and do either paragraph (1)
or (2) as follows:
(1) At intervals not to exceed 12 hours time-in-service (TIS),
using a 10X or higher magnifying glass, inspect both sides of each
blade for a deformation, a crack, and a bent or deformed weight in the
area shown in Figure 1 of this AD, or
(2) Inspect and check both sides of each blade for a deformation, a
crack, and a bent or deformed weight in the area shown in Figure 1 of
this AD as follows:
(i) Using a 10X or higher magnifying glass, inspect at intervals
not to exceed 24 hours TIS, and
(ii) Check at intervals not to exceed 3 hours TIS between the
inspections required by paragraph (b)(2)(i) of this AD. An owner/
operator (pilot), holding at least a private pilot certificate, may
perform this visual check and must enter compliance with this paragraph
into the helicopter maintenance records by following 14 CFR sections
43.11 and 91.417(a)(2)(v).
(c) Before further flight, replace any blade that has a
deformation, a crack, or a bent or deformed weight with an airworthy
blade.

Note 2: Bell Helicopter Textron Alert Service Bulletin No. 206-
04-100 for Model 206A and B and No. 206L-04-127 for Model 206L
series, both Revision B, both dated May 28, 2004, pertain to the
subject of this AD.

(d) To request a different method of compliance or a different
compliance time for this AD, follow the procedures in 14 CFR 39.19.
Contact the Safety Management Group, Rotorcraft Directorate, FAA, for
information about previously approved alternative methods of
compliance.
(e) This amendment becomes effective on December 16, 2004.

Note 3: The subject of this AD is addressed in Transport Canada
(Canada) AD No. CF-2004-05R1, dated June 28, 2004.

Issued in Fort Worth, Texas, on November 22, 2004.
Kim Smith,
Acting Manager, Rotorcraft Directorate, Aircraft Certification Service.
[FR Doc. 04-26425 Filed 11-30-04; 8:45 am]
BILLING CODE 4910-13-P

Airworthiness Directives; Bell Helicopter Textron Canada Model 206A, B, L, L-1, L-3, and L-4 Helicopters

Applicability

Unsafe Condition

Required Actions

Compliance Time

Affected Aircraft

Federal Register Abstract

Document Text

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