# CFM International Service Bulletin LEAP-1A-72-00-0562-01A-930A-D: Revision 001

- Rights: © CFM International. Filed by the FAA in regulations.gov docket FAA-2025-1115; AD 2026-02-04 incorporates this document by reference. Not covered by OpenAirDocs’ CC0 dedication.
- Document: [CFM International Service Bulletin LEAP-1A-72-00-0562-01A-930A-D](https://openairdocs.org/service-documents/cfm/leap1a-72-00-0562-01a930a-d.md)
- Title as filed: LEAP-1A SB 72-0562 Issue 001
- Pages: 14
- PDF: https://openairdocs.org/files/sha256/3f/8f/3f8f207cda918fe4a81df76eb46507343f4b5d8c41bef79711e77e6b52dd2f2c
- Page: https://openairdocs.org/service-documents/cfm/leap1a-72-00-0562-01a930a-d/file/3f8f207cda91

## Text

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### Page 1

LEAP
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1A
-
72
-
00
-
0562
-
01A
-
930A
-
D
ENGINE
-
GENERAL
(72
-
00
-
00)
-
NON
-
SYNCHRONOUS
VIBRA
TION
MONIT
ORING
RECOMMENDA
TIONS
FOR
ENGINES
WITH
NO.
3
BEARING
SPRING
FINGER
HOUSING
FROM
“GCJ”
SUPPLIER
SERVICE
BULLETIN
T
able
of
contents
1.
REVISION
INFORMA
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2.
SUMMAR
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A.
Reason
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3.
PLANNING
INFORMA
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A.
Applicability
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B.
Concurrent
requirements
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C.
Reason
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D.
Description
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E.
Compliance
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F
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Approval
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G.
Manpower
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H.
W
eight
and
balance
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I.
Electrical
load
data
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J.
Software
accomplishment
summary
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K.
Referenced
documentation
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L.
Documentation
af
fected
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M.
Industry
support
information
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N.
Interchangeability
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4.
MA
TERIAL
INFORMA
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5.
ACCOMPLISHMENT
INSTRUCTIONS
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5
A.Alternative
Procedure
A
vailable
-
NSV
Monitoring
with
Fleeting
Reports
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B.Alternative
Procedure
-
NSV
Monitoring
with
ACMS
T
akeof
f
Reports
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C.Housing
Removal
and
Replacement
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6.
ADDITIONAL
INFORMA
TION
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A.
Additional
information
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12
List
of
tables
T
able:
References
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2
T
able
1:
LEAP
-
1A
Engines
with
Af
fected
No.
3
Bearing
Spring
Finger
Housing
P/N
2629M62G01
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10
T
able
2:
CFM
Contact
Information
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13
LEAP
-
1A
-
72
-
00
-
0562
-
01A
-
930A
-
D
Page
1/
14
Issue
001
-
00
-
2025
-
04
-
30
©
CFM
PROPRIET
AR
Y
INFORMA
TION:
Subject
to
the
restrictions
on
the
media.

### Page 2

LEAP
-
1A
-
72
-
00
-
0562
-
01A
-
930A
-
D
List
of
figures
Figure
1:
No.
3
Bearing
Spring
Finger
Housing
Location
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1
1
CFM
PROPRIET
AR
Y
INFORMA
TION
The
information
contained
in
this
document
is
CFM
proprietary
information
and
is
disclosed
in
confidence.
It
is
the
property
of
CFM
and
shall
not
be
used,
disclosed
to
others
or
reproduced
without
the
express
written
consent
of
CFM,
including,
but
without
limitation,
it
is
not
to
be
used
in
the
creation,
manufacture,
development,
or
derivation
of
any
repairs,
modifications,
spare
parts,
design,
or
configuration
changes
or
to
obtain
F
AA
or
any
other
government
or
reg-
ulatory
approval
to
do
so.
If
consent
is
given
for
reproduction
in
whole
or
in
part,
this
notice
and
the
notice
set
forth
on
each
page
of
this
document
shall
appear
in
any
such
reproduction
in
whole
or
in
part.
The
information
contained
in
this
document
may
also
be
controlled
by
U.S.
export
control
laws.
Unauthorized
export
or
re
-
export
is
prohibited.
References
T
able:
References
T
echnical
Publication
LEAP
-
1A
-
71
-
00
-
0013
-
01A
-
930A
-
D
LEAP
-
1A
-
72
-
00
-
0536
-
01A
-
930A
-
D
LEAP
-
1A
-
72
-
61
-
00
-
01A
-
530A
-
C
LEAP
-
1A
-
72
-
61
-
00
-
01A
-
710A
-
C
Management
information
Manufacturer
recommendation:
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.
Recommended
T
ask
type:
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Inspection
Original
issue
date:
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2025
-
04
-
30
1.
REVISION
INFORMA
TION
Not
Applicable.
2.
SUMMAR
Y
A.
Reason
This
Service
Bulletin
provides
recommendations
for
monitoring
non
-
synchronous
vibration
(NSV)
during
engine
operation,
using
engine
-
generated
data
and
snapshot
reports
to
reduce
significant
events.
3.
PLANNING
INFORMA
TION
A.
Applicability
LEAP
-
1A
-
72
-
00
-
0562
-
01A
-
930A
-
D
Page
2/
14
Issue
001
-
00
-
2025
-
04
-
30
©
CFM
PROPRIET
AR
Y
INFORMA
TION:
Subject
to
the
restrictions
on
the
media.

### Page 3

LEAP
-
1A
-
72
-
00
-
0562
-
01A
-
930A
-
D
This
Service
Bulletin
is
applicable
to:
•
Engine
type:
LEAP
-
1A
•
Engine
model(s):
LEAP
-
1A23,LEAP
-
1A24,LEAP
-
1A24E1,LEAP
-
1A26,LEAP
-
1A26CJ,LEAP
-
1A26E1,LEAP
-
1A29,LEAP
-
1A29CJ,LEAP
-
1A30,LEAP
-
1A32,LEAP
-
1A33,LEAP
-
1A33B2,LEAP
-
1A35A
This
Service
Bulletin
is
applicable
to
all
LEAP
-
1A
engines
which
have
installed
any
of
the
No.
3
ball
and
roller
bearing
housings
(No.
3
bearing
spring
finger
housings)
P/N
2629M62G01
with
a
serial
number
(S/N)
listed
in
T
able
1
of
paragraph
5.,
ACCOMPLISHMENT
INSTRUCTIONS.
B.
Concurrent
requirements
None.
C.
Reason
(1)
Objective:
This
Service
Bulletin
provides
recommendations
for
monitoring
NSV
during
engine
operation,
using
engine
-
generated
data
and
snapshot
reports
to
reduce
significant
events.
(2)
Condition:
LEAP
-
1A
engines
with
elevated
NSV
indications
may
be
at
risk
for
premature
hardware
deterioration,
engine
stalls,
or
false
alerting.
(3)
Cause:
Elevated
NSV
indications
can
occur
because
of
multiple
conditions,
including
but
not
limited
to
No.
3
bearing
spring
finger
housing
(SIN:
052A6)
wear
,
oil
flow
interruption,
low
oil
temperatures,
erroneous
accelerometer
sensor
feedback,
or
data
corruption
issues.
(4)
Inspection:
CFM
recommends
LEAP
-
1A
engines
be
monitored
for
elevated
NSV
indications
and
removed
from
service
if
NSV
indications
exceed
thresholds
provided
in
this
Service
Bulletin.
(5)
Substantiation:
Substantiation
is
by
analysis,
test,
and
fleet
experience.
D.
Description
This
Service
Bulletin
provides
recommendations
for
monitoring
NSV
during
engine
operation,
using
engine
-
generated
data
and
snapshot
reports
to
reduce
significant
events.
E.
Compliance
Category
2
For
LEAP
-
1A
engines
with
a
No.
3
bearing
spring
finger
housing
listed
in
T
able
1
of
paragraph
5.,
ACCOMPLISHMENT
INSTRUCTIONS,
CFM
recommends
that
you
do
this
Service
Bulletin
as
soon
as
possible
without
ef
fect
on
revenue
services
but
before
or
at
every
50
cycle
interval
of
engine
operation.
At
the
issuance
of
this
Service
Bulletin,
do
the
initial
NSV
evaluation
within
50
flight
cycles
after
the
issuance
of
this
Service
Bulletin.
Impact
B
This
recommendation
is
to
address
a
condition
that
may
result
in
an
Increased
Rate
of
In
-
Flight
Shutdowns
(IFSD),
T
ake
-
Of
f
Aborts
(T
OA),
Air
T
urn
Backs
(A
TB)
or
Diversions
(DIV).
NOTE:
Some
steps
in
paragraph
5.,
ACCOMPLISHMENT
INSTRUCTIONS
are
identified
as
required
for
com-
pliance
(RC).
If
this
Service
Bulletin
is
mandated
by
an
airworthiness
directive
(AD),
the
steps
identified
as
RC
must
be
done
to
comply
with
the
AD.
Steps
not
identified
with
RC
are
recommended
and
may
be
LEAP
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14
Issue
001
-
00
-
2025
-
04
-
30
©
CFM
PROPRIET
AR
Y
INFORMA
TION:
Subject
to
the
restrictions
on
the
media.

### Page 4

LEAP
-
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deviated
from,
done
as
a
part
of
other
actions,
or
done
with
accepted
methods
different
from
those
given
in
this
Service
Bulletin
if
the
RC
steps
can
be
done
and
the
airplane
returned
to
a
serviceable
condition.
NOTE:
This
Service
Bulletin
can
be
done
on
wing.
This
Service
Bulletin
is
of
fered
to
improve
the
reliability
or
performance
of
your
CFM
product,
or
to
help
prevent
the
occurrence
of
the
event
or
condition
described
in
this
Service
Bulletin.
If
the
operator
elects
not
to
participate
in
the
bulletin,
that
decision
will
be
taken
into
consideration
by
CFM
in
evaluating
future
product
performance
issues
that
may
arise
in
the
operator
’
s
fleet.
F
.
Approval
The
technical
content
of
this
Service
Bulletin
is
approved
by
the
F
AA
and
under
the
Authority
of
DOA
No.
EASA.21J.086.
G.
Manpower
No
additional
man
-
hours
are
required
to
comply
with
this
Service
Bulletin.
H.
W
eight
and
balance
W
eight
and
balance
are
not
changed.
I.
Electrical
load
data
Not
Applicable.
J.
Software
accomplishment
summary
Not
Applicable.
K.
Referenced
documentation
Airbus
A318/A319/A320/A321
Aircraft
Maintenance
Manual
(AMM)
CFM
LEAP
-
1A
Engine
Illustrated
Parts
Catalog
(EIPC),
CFM
-
TP
-
610
EIPC.20
CFM
LEAP
-
1A
Engine
Shop
Manual
(ESM),
CFM
-
TP
-
610
SM.20
CFM
Service
Bulletin
LEAP
-
1A
71
-
0013,
POWER
PLANT
-
GENERAL
(71
-
00
-
00)
-
INSTRUCTIONS
FOR
PROVIDING
ACMS/EEC
SNAPSHOT
REPOR
TS
T
O
CFM
WHEN
DA
T
A
TRANSMISSION
IS
INTERRUPTED
CFM
Service
Bulletin
LEAP
-
1A
72
-
0536,
ENGINE
-
GENERAL
(72
-
00
-
00)
-
RECOMMENDA
TIONS
FOR
ENGINES
WITH
POTENTIAL
NO.
3
BEARING
SPRING
FINGER
HOUSING
WEAR
L.
Documentation
affected
None.
M.
Industry
support
information
None.
N.
Interchangeability
Not
Applicable.
4.
MA
TERIAL
INFORMA
TION
List
of
material
sets
Not
Applicable.
LEAP
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4/
14
Issue
001
-
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-
2025
-
04
-
30
©
CFM
PROPRIET
AR
Y
INFORMA
TION:
Subject
to
the
restrictions
on
the
media.

### Page 5

LEAP
-
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-
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List
of
support
equipment
Not
Applicable.
List
of
supplies
Not
Applicable.
List
of
spares
Not
Applicable.
List
of
removed
spares
Not
Applicable.
5.
ACCOMPLISHMENT
INSTRUCTIONS
A.
Alternative
Procedure
A
vailable
-
NSV
Monitoring
with
Fleeting
Reports
(1)
RC
-
Evaluation
of
Post
-
Flight
Data
A
vailability
and
A
vailable
NSV
Data.
NOTE:
If
step
5.B.(1)
is
completed,
then
step
5.A.(1)
is
not
necessary
for
compliance.
(a)
At
or
before
each
50
-
cycle
interval,
CFM
recommends
to
evaluate
your
post
-
flight
summary
data
avail-
ability
and
available
NSV
fleeting
reports
as
follows:
NOTE:
Post
-
flight
data
availability
can
be
evaluated
on
myCFM
Portal
(https://mycfmportal.com),
CFM
Fleet
Monitor
(https://fleetmonitor
.mycfmportal.com),
Fleet
Monitor
X
(https://my
.geaviation.
com/fmx),
or
similar
online
tools.
1
If
you
have
100
cycles
or
higher
of
post
-
flight
data
within
the
past
125
cycles,
continue
with
step
5.A.(1)(b).
2
Alternative
Procedure
A
vailable.
If
you
have
0
to
99
cycles
of
post
-
flight
data
within
the
past
125
cycles,
get
additional
post
-
flight
summary
(PFS)
data
as
specified
in
step
5.A.(2)
within
the
next
50
cycles
to
restore
your
PFS
data
to
100
cycles
or
higher
and
do
as
follows:
a
If
data
coverage
requirement
is
met,
continue
with
step
5.A.(1)(b).
b
If
data
coverage
requirement
is
not
met,
remove
the
engine
within
50
cycles.
3
Alternative
Procedure.
Examine
your
NSV
with
the
aircraft
condition
monitoring
system
(ACMS)
method
as
specified
in
step
5.B.
4
Alternative
Procedure.
If
suf
ficient
data
coverage
from
step
5.A.
or
step
5.B.
cannot
be
met
and
cal-
culations
were
not
made
as
specified
in
step
5.A.
or
step
5.B.,
remove
the
engine
within
50
cycles.
NOTE:
Increased
data
coverage
can
improve
the
effectiveness
of
this
NSV
monitoring.
(b)
After
data
availability
is
100
cycles
or
higher
of
post
-
flight
data
within
the
past
125
cycles,
compare
avail-
able
NSV
fleeting
reports
as
specified
in
step
5.A.(3)
and
step
5.A.(4).
(2)
Recommendations
for
Obtaining
Additional
Post
-
Flight
Data
(if
necessary).
(a)
Alternative
Procedure
A
vailable.
Download
electronic
engine
control
(EEC)
snapshot
reports
and
send
to
CFM
for
NSV
monitoring.
Refer
to
the
LEAP
-
1A
S/B
71
-
0013
(
Refer
to
SB:
LEAP
-
1A
-
71
-
00
-
0013
-
01A
-
930A
-
D
)
and
do
as
follows:
1
Send
all
downloaded
data
to
CFM
through
standard
processes.
LEAP
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14
Issue
001
-
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-
2025
-
04
-
30
©
CFM
PROPRIET
AR
Y
INFORMA
TION:
Subject
to
the
restrictions
on
the
media.

### Page 6

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(b)
Alternative
Procedure.
If
EEC
snapshots
are
already
available
from
the
EEC
or
are
available
in
other
customer
location,
then
send
all
data
to
CFM
through
standard
processes.
(3)
RC
-
NSV
T
rend
Monitoring
with
CFM
Diagnostics.
NOTE:
If
step
5.B.(3)
is
completed,
then
step
5.A.(3)
is
not
necessary
for
compliance.
NOTE:
CFM
Diagnostics
uses
alert
technology
on
a
flight
-
by
-
flight
basis
dependent
on
EEC
post
-
flight
summary
and
fleeting
reports
snapshot
data
given
to
CFM.
If
the
conditions
are
present
to
generate
an
alert
based
on
the
guidance
specified
in
this
Service
Bulletin,
the
data
will
be
evaluated
and
a
customer
notification
report
(CNR)
will
be
issued
to
the
operator
.
(a)
The
use
of
CFM
diagnostics
on
myCFM
Portal
(https://mycfmportal.com)
is
contingent
upon
the
regular
submittal
of
PFS
and
vibration
fleeting
event
(FL
T)
reports
to
CFM.
NOTE:
The
parameters
available
in
CFM
Fleet
Monitor
(https://fleetmonitor
.mycfmportal.com)
trends
can
also
be
accessed
via
myCFM
Portal
Plotting
widget.
myCFM
Portal,
CFM
Fleet
Monitor
,
or
equivalent
CFM
web
-
based
tools
can
be
used
for
engine
health
trend
monitoring.
The
myCFM
Portal
Data
Query
widget
can
also
be
used
to
set
-
up
an
automated
query
for
the
parameters
necessary
for
monitoring
engine
condition.
NOTE:
The
parameter
"NSV
TCF
Max
V
ibe
Fleeting"
is
also
referred
to
as
NSV
Fleeting
Reports
in
this
Service
Bulletin.
(b)
Do
the
steps
that
follow
to
find
the
"NSV
TCF
Max
V
ibe
Fleeting"
values:
1
Access
to
CFM
Fleet
Monitor
(https://fleetmonitor
.mycfmportal.com)
and
enter
the
engine
serial
num-
ber
in
the
search
window
.
2
Select
T
rends
tab
and
open
the
"LEAP
NSV"
plotset.
3
A
custom
trend
plot
can
be
created
with
the
selections
that
follow:
a
Select
"Create
new"
or
"Create
a
new
trend".
b
Select
"All"
or
"Engine"
for
the
parameters
category
.
c
Select
"NSV
TCF
Max
V
ibe
Fleeting"
from
the
search
bar
.
d
Select
Update.
NOTE:
"NSV
TCF
Max
V
ibe
Fleeting"
can
be
displayed
as
"NSV
TCF
Max
V
ibe
Fleeting
FLEETING
EVENT
Raw"
in
the
CFM
Diagnostics
tools.
NOTE:
FL
T
reports
can
be
generated
for
various
vibration
parameters.
FL
T
reports
are
only
gen-
erated
because
of
NSV
levels
if
the
NSV
level
is
more
than
or
equal
to
1.1
Gs
in
magnitude.
When
"NSV
TCF
Max
V
ibe
Fleeting"
is
at
a
value
of
0
G,
it
is
not
actual
measurement
of
NSV
and
is
not
to
be
used
for
NSV
monitoring.
NOTE:
The
"LEAP
NSV"
plotset
also
includes
other
parameters
from
snapshot
reports,
which
can
be
able
to
help
to
find
out
whether
the
NSV
indications
are
because
of
low
oil
temperature
or
TCF
accelerometer
feedback
issues.
NOTE:
It
can
be
necessary
to
modify
the
"Date
Range"
drop
down
on
the
trends
tab
in
order
to
update
the
date
range
for
this
data.
(c)
Compare
your
available
NSV
Fleeting
reports
to
the
limits
in
step
5.A.(4).
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14
Issue
001
-
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-
2025
-
04
-
30
©
CFM
PROPRIET
AR
Y
INFORMA
TION:
Subject
to
the
restrictions
on
the
media.

### Page 7

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(4)
NSV
Monitoring
Recommendations.
(a)
CFM
recommends
to
use
the
monitoring
thresholds
that
follow
and
do
the
maintenance
recommendations
when
NSV
indications
are
present
because
of
conditions
which
can
progress
to
an
NSV
stall:
1
RC
-
If
there
are
three
or
more
NSV
fleeting
reports,
more
than
or
equal
to
1.1
Gs
in
magnitude
in
the
past
50
cycles,
CFM
recommends
engine
removal
within
25
cycles
from
the
flight
when
this
threshold
is
exceeded
and
follow
the
requirements
in
step
5.A.(4)(a)4.
NOTE:
If
step
5.B.(4)(a)1
is
completed,
then
step
5.A.(4)(a)1
is
not
necessary
for
compliance.
2
RC
-
If
there
is
one
or
more
NSV
fleeting
reports,
more
than
or
equal
to
2.0
Gs
in
magnitude
in
the
past
50
cycles,
CFM
recommends
engine
removal
within
5
cycles
from
the
flight
when
this
threshold
is
exceeded
and
follow
the
requirements
in
step
5.A.(4)(a)4.
NOTE:
If
step
5.B.(4)(a)1
is
completed,
then
step
5.A.(4)(a)2
is
not
necessary
for
compliance.
3
If
the
threshold
in
step
5.A.(4)(a)1
or
step
5.A.(4)(a)2
is
exceeded,
before
engine
removal
CFM
rec-
ommends
engine
de
-
rate
during
takeof
f
whenever
possible
in
order
to
reduce
the
potential
for
stall.
4
RC
-
When
the
engine
is
removed
as
specified
in
step
5.A.(4)(a)1
or
step
5.A.(4)(a)2
and
sent
to
a
maintenance
facility
,
the
actions
that
follow
are
necessary:
NOTE:
If
step
5.B.(4)(a)3
is
completed,
then
step
5.A.(4)(a)4
is
not
necessary
for
compliance.
a
Remove
and
scrap
the
No.
3
bearing
spring
finger
housing
(1,
Figure
1
)
(SIN:
052A6).
Refer
to
LEAP
-
1A
S/B
72
-
0536
(
Refer
to
SB:
LEAP
-
1A
-
72
-
00
-
0536
-
01A
-
930A
-
D
).
b
Do
an
inspection
and
disposition
of
stage
2
high
pressure
turbine
(HPT)
nozzle
assembly
(SIN:
17300)
and
the
HPT
stator
stationary
seal
(SIN:
925A3).
Refer
to
LEAP
-
1A
S/B
72
-
0536
(
Refer
to
SB:
LEAP
-
1A
-
72
-
00
-
0536
-
01A
-
930A
-
D
).
NOTE:
Some
NSV
indications
as
described
in
paragraph
6.,
ADDITIONAL
INFORMA
TION
can
alert
the
NSV
trending
or
fleeting
reports,
but
could
not
indicate
that
a
condition
is
present
that
could
progress
to
a
NSV
stall.
Before
engine
removal,
CEOD
and
other
snapshot
data
from
flights
with
elevated
NSV
levels
can
be
reviewed
to
find
out
the
potential
cause
of
the
NSV
indications.
Refer
to
step
6.A.(3)
to
contact
CFM.
B.
Alternative
Procedure
-
NSV
Monitoring
with
ACMS
T
akeoff
Reports
(1)
RC
-
Evaluation
of
ACMS
reports
A
vailability
and
Calculated
NSV
Data
NOTE:
If
step
5.A.(1)
is
completed,
then
step
5.B.(1)
is
not
necessary
for
compliance.
NOTE:
Parameter
from
ACMS
takeoff
named
VB
is
the
measured
value
of
the
overall
engine
vibrations
that
can
be
used
for
data
availability
.
NOTE:
If
CFM
Diagnostics
is
not
used
for
NSV
monitoring
as
specified
in
step
5.A.,
the
operator
can
use
their
available
ACMS
takeoff
data
for
monitoring
with
the
steps
mentioned
below
.
(a)
At
or
before
each
50
cycles
interval,
CFM
recommends
that
you
do
a
check
of
the
parameter
VB
with
the
evaluation
of
your
available
ACMS
takeof
f
data
as
follows:
1
If
you
have
100
cycles
or
higher
of
parameter
VB
within
the
past
125
cycles,
continue
with
step
5.B.(1)(b).
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7/
14
Issue
001
-
00
-
2025
-
04
-
30
©
CFM
PROPRIET
AR
Y
INFORMA
TION:
Subject
to
the
restrictions
on
the
media.

### Page 8

LEAP
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2
Alternative
Procedure
A
vailable.
If
you
have
0
to
99
cycles
of
parameter
VB
the
past
125
cycles,
get
additional
ACMS
takeof
f
as
specified
in
step
5.B.(2)
within
the
next
50
cycles
to
restore
your
ACMS
data
to
100
cycles
or
higher
and
do
as
follows:
a
If
data
coverage
requirement
is
met,
continue
with
step
5.B.(1)(b).
b
If
data
coverage
requirement
is
not
met,
remove
the
engine
within
50
cycles.
3
Alternative
Procedure.
Examine
your
NSV
monitoring
with
the
NSV
fleeting
reports
in
step
5.A.
4
Alternative
Procedure.
If
suf
ficient
data
coverage
from
step
5.A.
or
step
5.B.
cannot
be
met
and
NSV
evaluation
were
not
made
as
specified
in
step
5.A.
or
step
5.B.,
remove
the
engine
within
50
cycles.
NOTE:
Increased
data
coverage
can
improve
the
effectiveness
of
this
NSV
monitoring.
(b)
After
data
availability
is
100
cycles
or
higher
of
parameter
VB
within
the
past
125
cycles,
calculate
your
es-
timated
NSV
and
apply
NSV
monitoring
recommendations
as
specified
in
steps
5.B.(3)
and
step
5.B.(4).
(2)
Recommendations
for
Obtaining
Additional
ACMS
Data
(if
necessary).
(a)
Download
aircraft
condition
monitoring
system
(ACMS).
Refer
to
the
LEAP
-
1A
S/B
71
-
0013
(
Refer
to
SB:
LEAP
-
1A
-
71
-
00
-
0013
-
01A
-
930A
-
D
).
(3)
RC
-
Calculating
Estimated
NSV
with
ACMS
Data.
NOTE:
If
step
5.A.(3)
is
completed,
then
step
5.B.(3)
is
not
necessary
for
compliance.
(a)
For
all
available
ACMS
data
over
the
past
125
cycles,
get
the
parameters
that
follow
from
ACMS
takeof
f
reports
and
from
the
same
flight
to
calculate
the
estimated
NSV
value
known
as
"Estimated
NSV
(Gs)",
as
calculated
in
step
5.B.(3)(e).
NOTE:
Parameter
values
from
ACMS
takeoff
reports
must
be
used
with
appropriate
decimal
format.
Refer
to
the
Airbus
A318/A319/A320/A321
AMM,
31
-
37
-
73,
AIDS
-
ENGINE
REPOR
TS,
for
number
formatting
of
the
parameters.
1
N1ACT
=
Selected
N1
actual
NOTE:
This
parameter
N1ACT
is
in
percentage
of
measured
fan
speed
and
it
needs
to
be
converted
in
step
5.B.(3)(b)
before
it
is
used
in
step
5.B.(3)(c).
2
VB
=
TRF
pick
up
Broadband
vibration
NOTE:
This
parameter
VBs
units
are
in
"ips"
and
it
does
not
need
to
be
converted
to
do
the
calculation
in
step
5.B.(3)(d).
3
VL
=
TRF
pick
up
N1
track
vibration
NOTE:
This
parameter
VLs
units
are
in
"mils"
and
it
needs
to
be
converted
in
step
5.B.(3)(c)
before
the
calculation
in
step
5.B.(3)(d).
4
VH
=
TRF
pick
up
N2
track
vibration
NOTE:
This
parameter
VHs
units
are
in
"ips"
and
it
does
not
need
to
be
converted
to
do
the
calculation
in
step
5.B.(3)(d).
(b)
Convert
"N1ACT"
to
"N1ACT
(rad/sec)"
as
follows:
NOTE:
The
value
N1ACT
from
step
5.B.(3)(a)
is
necessary
for
this
conversion.
LEAP
-
1A
-
72
-
00
-
0562
-
01A
-
930A
-
D
Page
8/
14
Issue
001
-
00
-
2025
-
04
-
30
©
CFM
PROPRIET
AR
Y
INFORMA
TION:
Subject
to
the
restrictions
on
the
media.

### Page 9

LEAP
-
1A
-
72
-
00
-
0562
-
01A
-
930A
-
D
1
N1ACT
(rad/sec)
=
(N1ACT
/
100)
*
3856
(rpm)
*
((2
*
3.14159)
/
60)
(rad/sec)
(c)
Use
the
equation
that
follows
to
convert
"VL"
to
"VL
(ips)":
NOTE:
V
alue
VL
from
step
5.B.(3)(a)
and
converted
value
N1ACT
(rad/sec)
from
step
5.B.(3)(b)
are
necessary
for
this
conversion.
1
VL
(ips)
=
(VL)
*
(N1ACT
(rad/sec))
/
2000
(in
/
mils
-
DA)
(d)
Use
the
equation
that
follows
to
calculate
"Estimated
NSV
(ips)":
NOTE:
The
value
of
VB
from
step
5.B.(3)(a),
converted
value
VL
(ips)
from
step
5.B.(3)(c),
and
value
of
VH
from
step
5.B.(3)(a)
are
necessary
for
this
calculation.
1
Estimated
NSV
(ips)
=
sqrt
(VB^2
-
(VL
(ips))^2
-
VH^2)
(e)
Use
the
equation
that
follows
to
calculate
"Estimated
NSV
(Gs)":
NOTE:
Calculated
value
"Estimated
NSV
(ips)"
from
step
5.B.(3)(d)
is
necessary
for
this
calculation.
1
Estimated
NSV
(Gs)
=
Estimated
NSV
(ips)
*
1.79
(f)
Compare
all
available
calculated
"Estimated
NSV
(Gs)"
values
over
the
past
125
cycles
that
were
calcu-
lated
in
step
5.B.(3)(e)
to
the
NSV
limits
in
step
5.B.(4).
(4)
NSV
Monitoring
Recommendations.
NOTE:
If
step
5.A.(1)
has
adequate
data
coverage
and
does
not
require
removal
of
the
engine
as
specified
in
step
5.A.(3)
and
step
5.A.(4),
then
this
step
5.B.(4)
does
not
need
engine
removal
even
if
limits
are
exceeded.
(a)
CFM
recommends
to
use
the
monitoring
thresholds
that
follow
and
do
the
maintenance
recommendations
when
NSV
indications
are
because
of
conditions
which
can
progress
to
an
NSV
stall:
1
RC
-
If
there
are
three
or
more
calculated
"Estimated
NSV
(Gs)"
values
from
step
5.B.(3)(e)
more
than
or
equal
to
1.1
Gs
in
magnitude
in
the
past
125
cycles,
CFM
recommends
engine
removal
within
25
cycles
from
the
flight
when
this
threshold
is
exceeded
and
obey
the
requirements
in
step
5.B.(4)(a)3.
NOTE:
If
step
5.A.(4)(a)1
or
step
5.A.(4)(a)2
is
completed,
then
step
5.B.(4)(a)1
is
not
necessary
for
compliance.
2
If
the
threshold
in
step
5.B.(4)(a)1
is
exceeded,
before
engine
removal
CFM
recommends
engine
de
-
rate
during
takeof
f
whenever
possible
in
order
to
reduce
the
potential
for
stall.
3
RC
-
When
the
engine
is
removed
as
specified
in
step
5.B.(4)(a)1
and
sent
to
a
maintenance
facility
,
the
actions
that
follow
are
necessary:
NOTE:
If
step
5.A.(4)(a)4
is
completed,
then
step
5.B.(4)(a)3
is
not
necessary
for
compliance.
a
Remove
and
scrap
the
No.
3
bearing
spring
finger
housing
(1,
Figure
1
)
(SIN:
052A6).
Refer
to
LEAP
-
1A
S/B
72
-
0536
(
Refer
to
SB:
LEAP
-
1A
-
72
-
00
-
0536
-
01A
-
930A
-
D
).
b
Do
an
inspection
and
disposition
of
stage
2
HPT
nozzle
assembly
(SIN:
17300)
and
the
HPT
stator
stationary
seal
(SIN:
925A3).
Refer
to
LEAP
-
1A
S/B
72
-
0536
(
Refer
to
SB:
LEAP
-
1A
-
72
-
00
-
0536
-
01A
-
930A
-
D
).
LEAP
-
1A
-
72
-
00
-
0562
-
01A
-
930A
-
D
Page
9/
14
Issue
001
-
00
-
2025
-
04
-
30
©
CFM
PROPRIET
AR
Y
INFORMA
TION:
Subject
to
the
restrictions
on
the
media.

### Page 10

LEAP
-
1A
-
72
-
00
-
0562
-
01A
-
930A
-
D
C.
Housing
Removal
and
Replacement
(1)
When
any
of
the
LEAP
-
1A
engines
with
a
No.
3
bearing
spring
finger
housing
serial
numbers
(S/N)
listed
in
T
able
1
is
removed
from
service
and
the
scrapped
No.
3
bearing
spring
finger
housing
(1,
Figure
1
)
(SIN:
052A6)
is
replaced
with
a
serviceable
No.
3
bearing
spring
finger
housing
(1)
(SIN:
052A6)
not
listed
in
T
able
1
,
then
this
NSV
monitoring
as
specified
in
step
5.A.
or
step
5.B.
is
not
necessary
.
Re-
moval
and
installation
instructions
have
not
changed.
Refer
to
the
LEAP
-
1A
ESM,
72
-
61
-
00,
DISASSEM-
BLE
PROCEDURE
(
Refer
to:
LEAP
-
1A
-
72
-
61
-
00
-
01A
-
530A
-
C
)
and
ASSEMBLE
PROCEDURE
(
Refer
to:
LEAP
-
1A
-
72
-
61
-
00
-
01A
-
710A
-
C
).
NOTE:
Manufacturing
records
show
that
the
No.
3
bearing
spring
finger
housing
S/Ns
listed
in
T
able
1
of
paragraph
5.,
ACCOMPLISHMENT
INSTRUCTIONS
are
installed
on
the
ESNs
listed.
ESNs
are
shown
for
reference
only
.
(2)
Make
sure
to
review
your
delivery
and
maintenance
records
to
find
the
S/Ns
of
the
No.
3
bearing
spring
finger
housings
(1,
Figure
1
)
(SIN:
052A6)
listed
in
T
able
1
that
are
installed
in
your
LEAP
-
1A
engines.
T
able
1:
LEAP
-
1A
Engines
with
Af
fected
No.
3
Bearing
Spring
Finger
Housing
P/N
2629M62G01
LEAP
-
1A
ESN
No.
3
Bearing
Spring
Finger
Housing
S/N
LEAP
-
1A
ESN
No.
3
Bearing
Spring
Finger
Housing
S/N
59A867
GCJ000HF
59A899
GCJ000H6
59A903
GCJ000H9
59B036
GCJ000H2
59B052
GCJ000H7
59B067
GCJ000LA
59B075
GCJ000HK
59B191
GCJ000E8
59B276
GCJ000HJ
59B302
GCJ000L7
59B306
GCJ000EA
59B328
GCJ000L9
59B353
GCJ000L3
59B382
GCJ000HA
59B389
GCJ000H4
59B407
GCJ000H3
59B419
GCJ000HC
59B433
GCJ000LH
59B447
GCJ000LL
59B455
GCJ000LC
59B457
GCJ000H8
59B490
GCJ000LE
59B51
1
GCJ000L1
59B521
GCJ000LK
59B820
GCJ000W5
59B871
GCJ000WJ
LEAP
-
1A
-
72
-
00
-
0562
-
01A
-
930A
-
D
Page
10/
14
Issue
001
-
00
-
2025
-
04
-
30
©
CFM
PROPRIET
AR
Y
INFORMA
TION:
Subject
to
the
restrictions
on
the
media.

### Page 11 (OCR)

cfm
The Power of Flight
LEAP-1A-72-00-0562-01A-930A-D
INLET GEARBOX AND
NO. 3 BEARING
ASSEMBLY
(SIN: 03000)
Л'WO
VIEW A
LEGEND:
1. NO. 3 BEARING SPRING FINGER HOUSING
(SIN: 052A6)
ICN-LEAP-1A-7200056  482-00001-A-001-01
No. 3 Bearing Spring Finger Housing Location
Figure 1
LEAP-1A-72-00-0562-01A-930A-D
Page 11/14
Issue 001-00 - 2025-04-30
© CFM PROPRIETARY INFORMATION: Subject to the restrictions on the media

### Page 12

LEAP
-
1A
-
72
-
00
-
0562
-
01A
-
930A
-
D
6.
ADDITIONAL
INFORMA
TION
A.
Additional
information
(1)
NSV
Monitoring
Recommendations
(a)
CFM
recommends
monitoring
LEAP
-
1A
engines
for
elevated
NSV
with
the
PFS
and
FL
T
EEC
generated
snapshot
reports.
1
The
PFS
report
contains
a
measurement
of
the
maximum
NSV
value
that
occurs
within
plus
or
minus
60
seconds
of
takeof
f.
There
is
no
magnitude
or
persistence
associated
with
the
NSV
trending
report.
PFS
reports
are
generated
by
the
EEC
after
engine
shutdown
after
a
flight.
NOTE:
This
NSV
trending
parameter
is
called
"NSV
TCF
Max
V
ibe
T
rending"
on
CFM
Diagnostics.
NOTE:
This
NSV
trending
parameter
is
not
currently
used
for
engine
removal
recommendations
but
can
be
used
to
evaluate
NSV
signals.
2
The
FL
T
report
can
be
generated
on
-
condition
when
the
value
of
the
NSV
parameter
is
more
than
1.1
Gs
for
over
2
seconds
of
persistence.
FL
T
reports
are
generated
on
-
condition
when
any
one
of
various
vibration
parameters
are
higher
than
a
monitoring
threshold.
A
FL
T
report
with
an
NSV
parameter
that
shows
"0"
does
not
indicate
the
NSV
level
was
0.0
G
at
that
flight,
but
typically
means
the
FL
T
report
was
generated
because
of
a
non
-
NSV
vibration
parameter
.
NOTE:
This
NSV
on
-
condition
parameter
is
called
"NSV
TCF
Max
V
ibe
Fleeting"
on
CFM
Diagnostics.
(2)
Background
Information
for
NSV
Indication
Causes
and
Effects
(a)
Elevated
NSV
indications
can
occur
because
of
the
conditions
that
follow
.
These
conditions
can
occur
independently
or
in
combination.
Some
sources
of
NSV
can
indicate
the
engine
is
at
risk
of
premature
hardware
deterioration,
engine
stalls,
and/or
limited
ability
to
accelerate
the
engine
above
idle.
1
No.
3
bearing
spring
finger
housing
(SIN:
052A6)
wear
.
2
No.
3
bearing
damper
oil
flow
interruption.
3
Low
oil
temperatures.
4
Erroneous
accelerometer
sensor
feedback.
5
Data
corruption
issues.
(b)
The
No.
3
bearing
damper
system
is
a
squeeze
film
damper
design.
The
oil
film
between
the
No.
3
roller
(machining)
bearing
housing
(damper
housing)
(SIN:
052A8)
and
the
No.
3
bearing
spring
finger
housing
(SIN:
052A6)
is
squeezed
during
LEAP
-
1A
engine
operation.
Resultant
pressures
exert
reaction
forces
on
the
damper
housing
(SIN:
052A8),
thereby
reducing
the
high
pressure
rotor
response
to
imbalance.
The
No.
3
bearing
spring
finger
housing
(SIN:
052A6)
can
be
susceptible
to
wear
in
the
ring
number
3
bearing
piston
(piston
ring)
(SIN:
052N2)
grooves.
After
some
accumulated
wear
,
the
piston
rings
(SIN:
052N2)
can
be
lodged
between
the
No.
3
bearing
spring
finger
housing
(SIN:
052A6)
and
the
damper
housing
(SIN:
052A8).
This
can
lead
to
a
reduction
in
the
damping
of
the
squeeze
film
design
and
progress
to
NSV
on
the
high
pressure
rotor
at
high
thrust
settings
where
torque
is
at
high
levels.
This
NSV
can
cause
the
high
pressure
rotor
to
whirl
as
it
rotates
and
potentially
af
fect
high
pressure
compressor
(HPC)
tip
clearances.
This
can
result
in
an
HPC
stall
at
elevated
thrust
settings.
1
No.
3
bearing
spring
finger
housing
(SIN:
052A6)
wear
typically
generates
fine
particles
that
consist
mostly
of
15
-
5
PH
material
that
are
captured
in
the
oil
scavenge
filter
and
result
in
elevated
oil
filter
delta
pressure
LEAP
-
1A
-
72
-
00
-
0562
-
01A
-
930A
-
D
Page
12/
14
Issue
001
-
00
-
2025
-
04
-
30
©
CFM
PROPRIET
AR
Y
INFORMA
TION:
Subject
to
the
restrictions
on
the
media.

### Page 13

LEAP
-
1A
-
72
-
00
-
0562
-
01A
-
930A
-
D
(OFDP).
OFDP
trend
monitoring
that
uses
the
ACMS
takeof
f
and
EEC
generated
PFS
reports
can
help
find
out
if
the
NSV
indications
are
related
to
housing
wear
.
(c)
The
No.
3
bearing
damper
system
needs
a
consistent
supply
of
oil
flow
to
establish
and
maintain
the
oil
film
during
operation.
Blockage
or
interruption
of
oil
flow
to
the
damper
system
can
cause
insuf
ficient
damping,
high
pressure
rotor
NSV
,
and
HPC
stall
at
elevated
thrust
settings.
Blockage
can
be
caused
by
oil
system
debris
or
contamination.
Field
experience
has
shown
that
oil
flow
blockage
is
rare,
but
can
result
in
rapid
onset
of
high
NSV
over
the
span
of
a
few
flights
and
quickly
progress
to
HPC
stall
at
elevated
thrust
settings.
Oil
flow
blockage
could
or
could
not
be
correctable
on
-
wing.
(d)
The
turbine
center
frame
(TCF)
accelerometer
is
used
to
detect
NSV
levels
on
the
high
pressure
rotor
.
Erroneous
accelerometer
sensor
feedback
can
result
in
NSV
indications
in
the
engine
-
generated
snapshot
reports
and
CEOD,
as
well
as
erroneous
indications
for
other
vibration
parameters.
Erroneous
NSV
signals
do
not
indicate
that
a
condition
that
could
progress
to
an
NSV
stall
is
present.
Erroneous
accelerometer
signals
can
be
caused
by
distress
to
the
TCF
accelerometer
,
the
HJA
harness,
and/or
the
channel
A
EEC.
1
If
the
NSV
indications
are
suspected
to
be
because
of
erroneous
TCF
accelerometer
feedback,
CFM
recommends
to
do
the
fault
isolation
tasks
below
(but
not
limited
to)
as
applicable
to
correct
the
cause
of
the
indication
issue:
•
Airbus
A318/A319/A320/A321
TSM,
T
ASK
77
-
31
-
00
-
810
-
816
-
A
(Fault
of
the
T
urbine
Center
Frame
Accelerometer
on
EEC
Channel
A).
•
Airbus
A318/A319/A320/A321
TSM,
T
ASK
77
-
31
-
00
-
810
-
817
-
A
[Fault
of
the
T
urbine
Center
Frame
Accelerometer
on
EEC
Channel
A
(External
Fault)].
•
Airbus
A318/A319/A320/A321
TSM,
T
ASK
73
-
21
-
01
-
810
-
934
-
A
(Fault
of
the
Channel
A
T
urbine
Center
Frame
Accelerometer
and
Channel
B
N1
Bearing
Accelerometer
on
both
EEC
Channels
-
Pre
-
LEAP
-
1A
S/B
73
-
0008).
•
Airbus
A318/A319/A320/A321
TSM,
T
ASK
73
-
21
-
01
-
810
-
976
-
A
[Fault
of
the
T
urbine
Center
Frame
Accelerometer
on
Engine
1
(2)
on
EEC
Channel
A
-
Post
-
LEAP
-
1A
S/B
73
-
0008
and
Subsequent].
(e)
The
NSV
parameters
used
for
trend
monitoring
are
calculated
by
the
EECs
and
transmitted
through
various
aircraft
and
on
-
ground
systems
for
processing.
Data
processing
issues
within
the
EECs
themselves
or
the
data
transmission
path
can
cause
the
NSV
parameter
values
used
for
monitoring
to
become
corrupted
and
falsely
indicate
elevated
NSV
levels.
Elevated
NSV
values
because
of
data
corruption
issues
do
not
indicate
that
a
condition
that
could
progress
to
an
NSV
stall
is
present.
1
Contact
CFM
for
assistance
to
identify
and
correct
the
cause
of
the
data
corruption.
Refer
to
paragraph
6.A.(3)
to
contact
CFM.
(3)
CFM
Contact
Information
T
able
2:
CFM
Contact
Information
CFM
SA
ZONE
CFM
Inc.
Zone
Customer
Support
Center:
http://mycfmportal.com
Widget
AskCFM
GE
A
viation
Fleet
Support:
http://www
.geaviation.com/support
OR
OR
to
be
continued
...
LEAP
-
1A
-
72
-
00
-
0562
-
01A
-
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-
D
Page
13/
14
Issue
001
-
00
-
2025
-
04
-
30
©
CFM
PROPRIET
AR
Y
INFORMA
TION:
Subject
to
the
restrictions
on
the
media.

### Page 14

LEAP
-
1A
-
72
-
00
-
0562
-
01A
-
930A
-
D
E
-
mail:
cfm.csc@safrangroup.com
E
-
mail
(USA):
aviation.fleetsupport@ge.com
E
-
mail
(China
and
Asia):
aviation.fleetsupport.cn@ge.com
OR
OR
PSE
CFM
SAFRAN
Aircraft
Engines
Site
de
MELUN
MONTEREAU
BP
1936
-
77019
Melun
Cedex
FRANCE
GE
A
viation
M/D
Rm.
285
One
Neumann
W
ay
OH
45215
USA
OR
OR
Phone:
+33
1
64
14
88
66
Fax:
+33
1
64
14
87
65
USA
Phone:
877
-
432
-
3272
International
Phone:
(513)
552
-
3272
China
and
Asia
Phone:
+
86
21
38777666
LEAP
-
1A
-
72
-
00
-
0562
-
01A
-
930A
-
D
End
of
data
module
Page
14/
14
Issue
001
-
00
-
2025
-
04
-
30
©
CFM
PROPRIET
AR
Y
INFORMA
TION:
Subject
to
the
restrictions
on
the
media.

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