Voglio sapere a riguardo di…

33496

Federal Register / Vol. 86, No. 120 / Friday, June 25, 2021 / Rules and Regulations
None of the changes will increase the economic burden on any operator.
Related Service Information Under 1
CFR Part 51
The FAA reviewed GE GEnx1B
Service Bulletin SB 720472 R02, dated November 5, 2020 GEnx1B SB
720472 and GE GEnx2B SB 720415
R02, dated November 5, 2020 GEnx2B
SB 720415.
GEnx1B SB 720472 describes procedures for performing a BSI or an ECI of stage 6, stage 7, and stage 8 webs, web transitions, and bore faces of the stages 610 compressor rotor spool for GEnx-1B model turbofan engines.
GEnx1B SB 720472 also provides the affected part and serial numbers of the stages 610 compressor rotor spools installed on GEnx1B model turbofan engines.
GEnx2B SB 720415 describes procedures for performing a BSI or an ECI of stage 6, stage 7, and stage 8 webs, web transitions, and bore faces of the stages 610 compressor rotor spool for GEnx-2B model turbofan engines.
GEnx2B SB 720415 also provides the affected part and serial numbers of the stages 610 compressor rotor spools
installed on GEnx-2B model turbofan engines.
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 The FAA also reviewed Subtask 72
3145160002 of TASK 723145
200807 in GE GEnx1B Engine Manual 052100, Life Limits 001 Mandatory Inspections, Rev. 31 dated, January 31, 2020; and Subtask 723145160002
of TASK 723145200801 in GE
GEnx2B Engine Manual 052100, Life Limits 001 Mandatory Inspections, Rev.
24 dated, January 31, 2020. The Subtasks provide guidance on performing the ECI on the stages 610
compressor rotor spool on GE GEnx1B
and GEnx2B model turbofan engines.
The FAA also reviewed the following GE SBs: GEnx1B SB 720448 R00, dated July 29, 2019 GEnx1B SB 72
0448; GEnx1B SB 720460 R00, dated October 30, 2019 GEnx1B SB 72
0460; GEnx2B SB 720385 R02, dated July 29, 2019 GEnx2B SB 720385;
and GEnx2B SB 720398 R00, dated
October 30, 2019 GEnx2B SB 72
0398.
GEnx1B SB 720448 describes procedures for performing a BSI or an ECI of the stage 8 aft web of the HPC
stages 610 rotor spool for GEnx1B
model turbofan engines. GEnx1B SB
720460 describes procedures for performing a BSI or an ECI of the stage 6 and stage 7 aft web of the HPC stages 610 rotor spool for GEnx1B model turbofan engines.
GEnx2B SB 720385 describes procedures for performing a BSI or an ECI of the stage 8 aft web of the HPC
stages 610 spool for GEnx2B model turbofan engines. GEnx2B SB 720398
describes procedures for performing a BSI or an ECI of the stage 6 and stage 7 aft web of the HPC stages 610 rotor spool for GEnx2B model turbofan engines.
Costs of Compliance The FAA estimates that this AD
affects 268 engines installed on airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:

ESTIMATED COSTS
Cost per product
Labor cost
BSI of GEnx1B stage 6, stage 7, and stage 8 webs, web transitions and bore faces of the stages 610 compressor rotor spool.
BSI of GEnx2B stage 6, stage 7, and stage 8 webs, web transitions and bore faces of the stages 610 compressor rotor spool.

6 work-hours $85 per hour = $510

$0

$510

$89,760

6 work-hours $85 per hour = $510

0

510

46,920

The FAA estimates the following costs to do any necessary replacements that would be required based on the
Parts cost
Cost on U.S.
operators
Action
results of the inspection. The agency has no way of determining the number of
aircraft that might need these replacements:

lotter on DSK11XQN23PROD with RULES1

ON-CONDITION COSTS
Action
Labor cost
Replace the stages 610 compressor rotor spool

64 work-hours $85 per hour = $5,440

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
VerDate Sep<11>2014

16:27 Jun 24, 2021

Jkt 253001

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 develop on products identified in this rulemaking action.

PO 00000

Frm 00018

Fmt 4700

Sfmt 4700

Parts cost $1,018,600

Cost per product $1,024,040

Regulatory Findings This AD will not have federalism implications under Executive Order 13132. This AD 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.
For the reasons discussed above, I
certify that this AD:

E:FRFM25JNR1.SGM

25JNR1