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Federal Register / Vol. 86, No. 172 / Thursday, September 9, 2021 / Proposed Rules Embraer Alert Service Bulletin SB505
55A004, Revision 5, dated December 12, 2019 SB505550A004 R5, as that service bulletin is not listed in paragraph l of AD 20201208 Credit for Previous Actions paragraph.
The FAA notes that the actions of AD
20201208 must be done in accordance with SB50555A004 R5. Paragraph f of AD 20201208 requires compliance unless already done. Thus, AD 2020
1208 already allows operators to take credit for using SB50555A004 R5 if done before the effective date of the AD.
Flexjet and an anonymous commenter requested AD 20201208 include Embraer Service Bulletin SB50555
0004, dated March 24, 2020 SB50555
0004, as this service bulletin addresses the worldwide fleet.
The FAA agrees. SB505550004
includes additional actions, which are required by ANAC AD No. 20200901, dated September 8, 2020. This proposed AD would include those additional requirements.
The individual commenter noted that SB505550004, SB50555A004 R5, and Embraer Alert Service Bulletin SB50555A004, Revision 06, dated March 25, 2020, apply to different ranges of serial numbers and requested the FAA clarify the correct serial numbers for AD 20201208.
AD 20201208 applies to all Model EMB505 airplanes, regardless of serial number. However, only those airplanes with a serial number in SB50555A004
R5 are required to do the actions in paragraphs h and k of AD 202012
08.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Embraer Alert Service Bulletin SB50555A004, Revision 06, dated March 25, 2020. This service information specifies procedures for inspecting the mass-balance weights of the flight control surfaces and their respective attachment parts for corrosion and fragmentation, and performing corrective actions on certain serial-numbered Model EMB505

airplanes. Corrective actions include installation of a stainless steel massbalance, replacement of the massbalance, and replacement of attachment parts.
The FAA also reviewed Embraer Service Bulletin SB505550004, Revision 01, dated June 24, 2020. This service information specifies procedures, for certain airplanes, for cleaning and weighing the elevator, aileron, and rudder mass-balances, and installing or replacing the mass-balances includes replacing attachment parts, as applicable, and for certain elevator mass-balances for certain airplanes, replacing those elevator mass-balances includes replacing attachment parts.
Embraer has also issued Alert Service Bulletin SB50555A004, Revision 5, dated December 12, 2019, which the Director of the Federal Register approved for incorporation by reference as of July 1, 2020 85 FR 36312, June 16, 2020.
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 ADDRESSES.
Other Related Service Information Embraer has issued Embraer Service Bulletin SB505550004, dated March 25, 2020. The actions specified in Embraer Service Bulletin SB50555
0004, dated March 25, 2020, are the same as those specified in Embraer Alert Service Bulletin SB505550004, Revision 01, dated June 24, 2020;
however, Embraer Alert Service Bulletin SB505 550004, Revision 01, dated June 24, 2020, was issued to add serialnumbered airplanes to the effectivity.
No additional work is required for airplanes on which Embraer Service Bulletin SB505550004, dated March 25, 2020, has been accomplished.
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 in the MCAI and service information described above. The FAA
is issuing this NPRM after determining that the unsafe condition described previously is likely to exist or develop on other products of the same type design.
Proposed AD Requirements in This NPRM
This proposed AD would retain the actions required by AD 20201208 and would require, for certain airplanes, cleaning and weighing the elevator, aileron, and rudder mass-balances, and installation or replacement, as applicable of the mass-balances. This proposed AD would also remove the reporting required by AD 20201208.
For the retained requirement to revise the airworthiness limitations section ALS of the existing maintenance manual or instructions for continued airworthiness in paragraph i of this proposed AD, the FAA notes the inspection tasks are part of Chapter 5 of the aircraft maintenance manualPart IIIscheduled maintenance requirements. This proposed AD would require these tasks as new airworthiness limitations.
Differences Between This Proposed AD
and the Service Information Embraer Alert Service Bulletin SB50555A004, Revision 5, dated December 12, 2019; and Revision 06, dated March 25, 2020, contain procedures for inspecting for the integrity of the mass-balance weights of flight control surfaces and their attachment parts. This proposed AD
would not include that requirement.
Costs of Compliance The FAA estimates that this AD, if adopted as proposed, would affect 392
airplanes of U.S. registry. The FAA
estimates the following costs to comply with this proposed AD:

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ESTIMATED COSTS FOR REQUIRED ACTIONS
Action
Labor cost
Parts cost
Cost per product
Retained inspections from AD
2020-12-08.
Retained ALS revision from AD 2020
1208.
New cleaning, weighing, and replacement.

9 work-hours $85 per hour = $765 ..

$100

$865

$339,080.

1 work hour 85 per hour = $85

$0

$85

$33,320.

Up to 130 work-hours $85 per hour = Up to $11,050.

Up to $18,118

Up to $29,168

Up to $11,433,856.

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Cost on U.S.
operators