Federal Register, Volume 75, Number 226, November 24, 2010, Pages 71519-72652 Page: 71,541
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Federal Register/Vol. 75, No. 226/Wednesday, November 24, 2010/Rules and Regulations 71541
condition for the Bell Model 222, 222B,
222U, 230, and 430 helicopters.
Transport Canada advises that it has
been determined that the piston rods of
the servo actuators "may be corroded
and, consequently, prone for corrosion
cracking." Also, in one case, "an
unapproved repair was found on the
piston rod." This situation, if not
corrected, could result in loss of control
of the helicopter.
Bell has issued Alert Service Bulletin
(ASB) No. 222-10-109 for the Model
222 and 222B helicopters, ASB No.
222U-10-80 for the Model 222U
helicopters, ASB No. 230-10-41 for the
Model 230 helicopters, and ASB No.
430-10-44 for the Model 430
helicopters. Each ASB is dated August
18, 2010, and specifies a one-time
inspection of all affected servo actuators
to verify the condition of the piston rod.
Woodward HRT also issued ASB No.
141600-67-02, dated August 18, 2010,
attached to each Bell ASB, which
specifies inspecting the piston rod for
corrosion and nonconforming grind
relief. It also contains instructions for
reworking and reassembling the unit for
operation. Transport Canada classified
the ASBs as mandatory and issued AD
No. CF-2010-29, dated August 26,
2010, to ensure the continued
airworthiness of these helicopters.
This AD differs from the Transport
Canada AD in that we require the initial
inspection before further flight rather
than no later than 5 hours air time upon
receiving the AD. Also, this AD requires
replacing unairworthy parts with
airworthy parts if certain conditions are
found and this AD does not add a life
limit for the servo actuator rod. Also,
this AD does not require a one time
rectification and a complete overhaul of
the servo actuator after the initial
inspection. This AD is an interim
These helicopters have been approved
by the aviation authority of Canada and
are approved for operation in the United
States. Pursuant to our bilateral
agreement with Canada, they have
notified us of the unsafe condition
described in the Transport Canada AD.
We are issuing this AD because we
evaluated all information provided by
Transport Canada and determined the
unsafe condition exists and is likely to
exist or develop on other helicopters of
these same type designs. Therefore, this
AD requires, before further flight:
* Disassembling the actuator to gain
access to the piston rod.
* Cleaning the entire piston rod and
nut using Acetone and a nylon bristle
brush removing all contaminates to
* Inspecting the grind relief
configuration for the piston rod and nut.
If the grind relief is unacceptable,
replacing the piston rod and the nut
with airworthy parts.
* Using a 10x or higher magnifying
glass, visually inspecting the nut for
corrosion or damage to the threads. If
you find any corrosion or damage to the
threads, replacing the nut with an
* Using a 10x or higher magnifying
glass, visually inspecting the piston rod
for any corrosion, visible lack of
cadmium plate (gold or grey color), or
damage to the piston rod. If you find
any corrosion, visible lack of cadmium
plate (gold or grey color), or damage to
the piston rod in the "Critical Areas,"
replacing the piston rod with an
airworthy piston rod.
* If you find any corrosion or visible
lack of cadmium plate on the piston rod
in areas that are not considered "Critical
Areas," reworking the piston rod by
removing any surface corrosion that has
not penetrated into the base material by
lightly buffing with scotch-brite.
Cleaning the part using Acetone and a
nylon bristle brush to remove any
* If you find any corrosion that is red
or orange in color, magnetic particle
inspecting the piston rod for a crack. If
you find a crack, replacing the piston
rod with an airworthy piston rod.
* Inspecting the portion of the piston
rod for any bare base metal that is not
coated with cadmium plate. If you find
any bare base metal on the piston rod
in this area, reworking the piston rod by
applying brush cadmium plating to all
bare and reworked areas.
* Reassembling the servo actuator.
* After reassembling the servo
actuator, marking it with the letter "B"
following the serial number on the name
plate using a scribe or vibrating stylus.
* Performing a hydraulic system check.
These actions must be accomplished
by following specified portions of the
ASBs described previously.
The short compliance time involved
is required because the previously
described critical unsafe condition can
adversely affect the structural integrity
and controllability of the helicopter.
Therefore, inspecting parts of the servo
actuator for certain conditions and
replacing any unairworthy parts are
required before further flight, and this
AD must be issued immediately.
Since it was found that immediate
corrective action was required, notice
and opportunity for prior public
comment thereon were impracticable
and contrary to the public interest, and
good cause existed to make the AD
effective immediately by individual
letters issued on August 31, 2010 to all
known U.S. owners and operators of
Bell Helicopter Textron Canada Model
222, 222B, 222U, 230, and 430
helicopters. These conditions still exist,
and the AD is hereby published in the
Federal Register as an amendment to 14
CFR 39.13 to make it effective to all
persons. However, we have made a
change to Note 1 of this AD, and we
have also clarified that we are not
adopting a reduced life limit for the
piston rod assembly. We have
determined that these changes will
neither increase the economic burden
on any operator nor increase the scope
of the AD.
We estimate that this AD will affect
146 helicopters of U.S. registry. There
are three servo actuators per helicopter.
For a servo actuator that is inspected
and does not require rework or repair,
removing each servo actuator,
performing the inspections, and re-
installing it will take approximately four
work hours at an average labor rate of
$85 per hour. For a servo actuator that
is inspected and requires a servo
actuator rod to be replaced, removing
each servo actuator, performing the
inspections, and re-installing an
airworthy servo actuator rod will also
take approximately four work hours.
Each replacement servo actuator rod is
estimated to cost $9,000. Based on these
figures, we assume that the total cost
impact of the AD on U.S. operators will
be $289,020, assuming 10% of the fleet
(15 helicopters) will need to replace one
servo actuator rod per helicopter.
This AD is a final rule that involves
requirements that affect flight safety and
was not preceded by notice and an
opportunity for public comment;
however, we invite you to submit any
written data, views, or arguments
regarding this AD. Send your comments
to an address listed under ADDRESSES.
Include "Docket No. FAA-2010-1137;
Directorate Identifier 2010-SW-079-
AD" at the beginning of your comments.
We specifically invite comments on the
overall regulatory, economic,
environmental, and energy aspects of
the AD. We will consider all comments
received by the closing date and may
amend the AD in light of those
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 with FAA
personnel concerning this AD. Using the
allow for inspection.
search function of our docket Web site,
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United States. Office of the Federal Register. Federal Register, Volume 75, Number 226, November 24, 2010, Pages 71519-72652, periodical, November 24, 2010; Washington D.C.. (digital.library.unt.edu/ark:/67531/metadc52807/m1/31/: accessed July 26, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.