Voglio sapere a riguardo di…

48068

Federal Register / Vol. 86, No. 164 / Friday, August 27, 2021 / Proposed Rules
the proposal, explain the reason for any recommended change, and include supporting data. The FAA will consider all comments received by the closing date and may amend the proposal because of those comments.
Except for Confidential Business Information CBI as described in the following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to https
www.regulations.gov, including any personal information you provide. The agency will also post a report summarizing each substantive verbal contact received about this proposed AD.

lotter on DSK11XQN23PROD with PROPOSALS1

Confidential Business Information CBI is commercial or financial information that is both customarily and actually treated as private by its owner.
Under the Freedom of Information Act FOIA 5 U.S.C. 552, CBI is exempt from public disclosure. If your comments responsive to this NPRM
contain commercial or financial information that is customarily treated as private, that you actually treat as private, and that is relevant or responsive to this NPRM, it is important that you clearly designate the submitted comments as CBI. Please mark each page of your submission containing CBI
as PROPIN. The FAA will treat such marked submissions as confidential under the FOIA, and they will not be placed in the public docket of this NPRM. Submissions containing CBI
should be sent to Gregory Johnson, Aviation Safety Engineer, AIR732
International Validation Section FAA, 901 Locust, Room 301, Kansas City, MO
641062641. Any commentary that the FAA receives which is not specifically designated as CBI will be placed in the public docket for this rulemaking.

possibly resulting in reduced control of the aeroplane.
To address that potential unsafe condition, RAI issued SB service bulletin F40662 to provide instructions to remove certain switches from service. Consequently, EASA
issued AD 20060134 to require identification of the date code of P/N
CM358950 CB switches and, depending on findings, replacement with improved design CB switches, P/N 406124001. That EASA
AD also imposed a life limit on the affected CB switches P/N CM358950.
Since that EASA AD was issued, inservice occurrences of smoke and burning smell in the cockpit have been reported on F 406 aeroplanes. Technical investigations revealed that these were due to failure of CB
switches P/N CM358920, which are used to control the propeller de-icing circuit.
Prompted by these events, ASI Aviation issued the applicable SB as defined in this EASA AD to provide instructions to replace the affected parts with serviceable parts.
For the reasons described above, this EASA AD retains the requirements of EASA
AD 20060134, which is superseded, expands the range of affected parts, and requires replacement of P/N CM358920 CB
switches with improved design CB switches P/N 406E245000000100. This EASA AD
also replaces the previous life limit, 1 000
flight hours FH for certain P/N CM358950
CB switches, with a 6 year calendar time life limit, and also imposes that limit on the improved design CB switches.

You may examine the MCAI in the AD docket at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0714.

Background The European Aviation Safety Agency EASA, which is the Technical Agent for the Member States of the European Union, has issued EASA AD 20190015, dated January 29, 2019 referred to after this as the MCAI, to address an unsafe condition on ASI Aviation type certificate previously held by Reims Aviation S.A. Model F406 airplanes.
The MCAI states:

Related Service Information Under 1
CFR Part 51
The FAA reviewed ASI Aviation Service Bulletin No. F40662, Revision 01, dated December 14, 2018, which specifies inspecting the CB switches to determine the date code, replacing CB
switches with certain date codes, and establishing a life limit of 6 years for the new CB switches. The FAA also reviewed ASI Aviation Service Bulletin No. F40690, dated December 14, 2018, which specifies replacing the CB
switches and establishing a life limit of 6 years for the new CB switches. This service information is reasonably available because the interested parties have access to it through their normal course of business or by the means identified in the ADDRESSES section.

After the Federal Aviation Administration issued AD 20052025, applicable to Cessna 400 series aeroplanes equipped with certain avionics bus CB switches, it was determined that, due to design commonality, one of the affected avionics bus CB switches, P/N part number CM358950, was also installed on Reims F 406 aeroplanes.
This condition, if not corrected, could lead to smoke and/or burning smell in the cockpit,
FAAs Determination This product has been approved by the aviation authority of another country and is approved for operation in the United States. Pursuant to the FAAs bilateral agreement with this State of Design Authority, it has notified the FAA of the unsafe condition described
VerDate Sep<11>2014

16:25 Aug 26, 2021

Jkt 253001

PO 00000

Frm 00023

Fmt 4702

Sfmt 4702

in the MCAI and service information referenced above. The FAA is issuing this NPRM after determining the unsafe condition described previously is likely to exist or develop on other products of the same type design.
Proposed AD Requirements This proposed AD would require accomplishing the actions specified in the service information already described, except as discussed under Differences Between this Proposed AD
and the MCAI.
Differences Between This Proposed AD
and the MCAI
The MCAI allows installation of an affected CB switch until the airplane is modified. This proposed AD would prohibit installation of an affected CB
switch as of the effective date of this AD.
Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 4
airplanes of U.S. registry.
The FAA also estimates that it would take about 5 work-hours per airplane to comply with the inspection required by this proposed AD. The average labor rate is $85 per work-hour.
Based on these figures, the FAA
estimates the inspection cost of this proposed AD on U.S. operators to be $1,700 or $425 per airplane.
In addition, the FAA estimates that each replacement required by this proposed AD would take about 1 workhour and require parts costing $350.
Based on these figures, the FAA
estimates the replacement cost of this proposed AD on U.S. operators to be $435 per airplane.
Authority for This Rulemaking Title 49 of the United States Code specifies the FAAs 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 Agencys authority.
The FAA is 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 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
E:FRFM27AUP1.SGM

27AUP1