C2 - Confidential
CFM has compiled a LEAP fan blades visual finding reference book which aid operator with visual aspect of fan
blade damages and findings on LEAP engines. Serviceability and specific limitations criteria are only to be
found in the aircraft maintenance manual, therefore LEAP fan blade visual finding reference book is only for
pictorial purposes and should not supersede aircraft manuals and should not be used as source for signing
off the write up in technical logbook.”
dfdfd
LEAP fan blades visual findings –
REFERENCE BOOK
LEAP PRODUCT SUPPORT ENGINEERING
2022, Oct
This document is for internal use only. It is not a training document and does not replace official Tech
Ops Training materials. It cannot be used as approved technical data
CFM International 1
CFM Proprietary Information is subject to restrictions
dfdfd
C2 - Confidential
This document is for internal use only. It is not a training document and does not replace official Tech
Ops Training materials. It cannot be used as approved technical data
CFM International 2
CFM Proprietary Information is subject to restrictions
dfdfd
C2 - Confidential
About this guide
This guide is to aid Operator with the visual aspect of fan
blades on LEAP Engines.
Fan blade specific limitations and serviceability criteria are
only to be found in the Engine Shop Manual and/or Aircraft
Maintenance Manual.
This document is for internal use only. It is not a training document and does not replace official
Tech Ops Training materials. It cannot be used as approved technical data
CFM International 3
CFM Proprietary Information is subject to restrictions
C2 - Confidential
CFM56, LEAP Proprietary
Information
CFM, CFM56, LEAP and the CFM logo are trademarks of
CFM International, a 50/50 joint company between Safran
Aircraft Engines and GE. The information in this document is
CFM Proprietary Information and is disclosed in confidence.
It is the property of CFM International and its parent
companies, and shall not be used, disclosed to others or
reproduced without the express written consent of CFM. If
consent is given for reproduction in whole or in part, this
notice shall appear in any such reproduction in whole or in
part. The information contained in this document may also be
controlled by the U.S. and French export control laws.
Unauthorized export or re-export is prohibited.
This document is for internal use only. It is not a training document and does not replace official Tech Ops
Training materials. It cannot be used as approved technical data
dfdfd
CFM International 4
CFM Proprietary Information is subject to restrictions
C2 - Confidential
Contact Information
If assistance is needed with this reference book, please contact:
GE Aviation
Regions covered: North America, South America, Asia Pacific and
China
Toll-free in U.S.: +1 877-432-3272
Phone: +1 513-552-3272
China & Asia Pacific: +86 21-3877-7666
Email: aviation.fleetsupport@ge.com
Customer Support Portal: https://cwciportal.cfm56.com
Safran Aircraft Engines
Regions covered: Africa, Middle East and Europe
Tel: +33 (0) 1 64 14 88 66
Email: snecma.csc@snecma.fr
Customer Support Portal: https://cwcs.cfm56.com
This document is for internal use only. It is not a training document and does not replace official Tech Ops Training
materials. It cannot be used as approved technical data
dfdfd
CFM International 5
CFM Proprietary Information is subject to restrictions
C2 - Confidential
Access to this Reference Book
Available on MyCFMPortal
▪
Widget MyDownload > Advanced Download
s
This document is for internal use only. It is not a training document and does not replace official Tech Ops Training
materials. It cannot be used as approved technical data
This document is for internal use only. It is not a training document and does not replace official Tech
CFM International 6
Ops Training materials. It cannot be used as approved technical
data Information is subject to restrictions
CFM Proprietary
C2 - Confidential
This document is for internal use only. It is not a training document and does not replace official Tech
Ops Training materials. It cannot be used as approved technical data
CFM International 7
CFM Proprietary Information is subject to restrictions
C2 - Confidential
Fan Blade Overview
All fan blade criteria (ESM, AMM,
Visual Findings Book) are defined
counter-clockwise following :
- Metallic Leading Edge
- Tip
- Trailing edge
- Airfoil
- Dovetail and shank
- Wearstrips
TIP
MLE (Metallic
Leading Edge)
TRAILING
EDGE
AIRFOIL
PLATFORM
WEARSTRIP
DOVETAIL
WEARSTRIP
DOVETAIL
AND SHANK
TE = Trailing Edge
LE = Leading Edge
NOTE : Applicable for convex and concave sides
This document is for internal use only. It is not a training document and does not replace official Tech
Ops Training materials. It cannot be used as approved technical data
CFM International 8
CFM Proprietary Information is subject to restrictions
C2 - Confidential
Fan Blade Overview
▪
▪
▪
3D Woven Carbon Composite
Titanium Leading Edge
Multi layer coating deposit process
Fiber
Resin
Composite material aspect
(non-painted area)
LEAP-1A
LEAP-1B
P/N 362-040-908
P/N 364-040-902
P/N 362-040-909
P/N 364-040-904
Concave Side
LEAP-1A
LEAP-1B
P/N 362-040-913
P/N 364-040-907
Black paint
Caution:
These cross section views of the fan blade do
not take into account the real dimensions of
the layers of polyurethane, primer and paint.
This document is for internal use only. It is not a training document and does not replace
Tech 9
CFMofficial
International
CFM Proprietary Information is subject to restrictions
Ops Training materials. It cannot be used as approved technical
data
C2 - Confidential
Fan Blade Overview
▪
▪
▪
3D Woven Carbon Composite
Titanium Leading Edge
Multi layer coating deposit process
A-A : Fan Blade Cross Section, from EIS to STEP2
LEAP-1A
LEAP-1B
P/N 362-040-908
P/N 364-040-902
P/N 362-040-909
P/N 364-040-904
Caution:
This cross section view of the
fan blade does not take into
account the real dimensions of
the layers of polyurethane,
primer and paint.
A-A : Fan Blade Cross Section, latest upgrade STEP3
LEAP-1A
LEAP-1B
P/N 362-040-913
P/N 364-040-907
Caution:
This cross section view of the
fan blade does not take into
account the real dimensions of
the layers of polyurethane,
primer and paint.
This document is for internal use only. It is not a training document and does not replace official Tech
CFM International 10
CFM Proprietary Information is subject to restrictions
Ops Training materials. It cannot be used as approved technical data
C2 - Confidential
Table of contents
Access to this Reference Book
Fan Blade Overview
1. Fan Blade Marking
a. Fan blade marking on shank
b. Metallic Leading Edge marking
2. MLE - Metallic Leading Edge visual aspects
a. Nicks, Dents, Scratches, Tears
b. Contact line versus Cracks
c. Disbonding, Crease
d. Porosity (hole) in MLE glue
3. Tip
a. Contact Area
b. Missing composite material
c. Cracks
d. Rectangular indentation
4. Airfoil visual aspects
a. Coating paint peeling
b. Coating Paint spalling and erosion
c. Decohesion Vs Cracks in painted areas ( 1/2 )
d. Decohesion Vs Cracks in painted areas ( 2/2 )
e. Coating MLE and Tip areas
f. Nick on concave side
g. Scratches
h. Tear
i. Indentation line, coating visual aspect
j. Porosity
5. Dovetail and Shank
a. Decohesion Vs Cracks in non painted areas
This document is for internal use only. It is not a training document and does not replace official Tech
Ops Training materials. It cannot be used as approved technical data
C2 - Confidential
Table of contents
5. Dovetail and Shank
b. Decohesion in non painted areas
c. Resin micro-cracking
6. Wearstrips visual aspects
a. Wearstrips description (1/3)
b. Wearstrips description (2/3)
c. Wearstrips description (3/3)
d. Erosion, wear
e. Frayed, disbonded corner
f. Coloration
Disclaimer
A. Typical findings in the CFM experience
after Birdstrike event
B. Typical findings in the CFM experience
after Icing event
C. Typical findings in the CFM experience
after fan blade seized in abradable
Reference : 18 fan blades drawing
This document is for internal use only. It is not a training document and does not replace official Tech
Ops Training materials. It cannot be used as approved technical data
C2 - Confidential
1. Fan blade marking
a. Fan blade marking on shank
LE
Fan blade marking
on convex side
Data
Matrix
Fan blade marking details
This document is for internal use only. It is not a training document and does not replace official Tech
Ops Training materials. It cannot be used as approved technical data
CFM International 13
CFM Proprietary Information is subject to restrictions
C2 - Confidential
1. Fan blade marking
b. Metallic Leading Edge marking
Metallic Leading Edge marking (MLE S/N and P/N) and fan
blade marking on shank (Fan blade S/N and P/N) are different
NOTE : Correlation possible between Metallic Leading Edge
S/N and Fan Blade S/N. If necessary, you can find information
in « MyCFM Portal » using ‘LEAP Fan Blade Metallic Leading
Edge SN Match’ file in the widget ‘Documents’
MLE
TE
LE
Convex Side
Metallic Leading Edge P/N
and S/N marking engraved
This document is for internal use only. It is not a training document and does not replace official Tech
Ops Training materials. It cannot be used as approved technical data
CFM International 14
CFM Proprietary Information is subject to restrictions
C2 - Confidential
2. MLE – Metallic leading edge visual aspects
a. Nicks, Dents, Scratches, Tears
Nick on MLE Sidewall
LE
TE
Convex Side
Scratch on MLE Sidewall
Tears on MLE nose
Nick on MLE nose
This document is for internal use only. It is not a training document and does not replaceCFM
official
Tech 15
International
CFM Proprietary Information is subject to restrictions
Ops Training materials. It cannot be used as approved technical data
C2 - Confidential
2. MLE – Metallic leading edge visual aspects
b. Contact line versus Cracks
MLE
TE
LE
Convex Side
Crack on MLE sidewall
≠
Fan blade platform seal
deposit on MLE sidewall
Fan blade platform seal
contact on MLE sidewall
This document is for internal use only. It is not a training document and does not replace official Tech
CFM International 16
CFM Proprietary
Information is subject to restrictions
Ops Training materials. It cannot be used as approved technical
data
C2 - Confidential
2. MLE – Metallic leading edge visual aspects
c. Disbonding, Crease
This document is for internal use only. It is not a training document and does not replace official Tech
Ops Training materials. It cannot be used as approved technical data
CFM International
CFM Proprietary Information is subject to restrictions
C2 - Confidential
2. MLE – Metallic leading edge visual aspects
d. Porosity (hole) in MLE glue
Tip Fan Blade view
LE
On the radius just above the area Q
This document is for internal use only. It is not a training document and does not replace official Tech
CFM International
CFM Proprietary Information is subject to restrictions
Ops Training materials. It cannot be used as approved technical data
C2 - Confidential
3. Tip visual aspects
a. Contact area
Convex Side
Material Deposit
Tip Rub
Melt resin, frayed carbon fiber
LE
TE
Contact area on Metallic Leading Edge tip
Coloration on Metallic Leading Edge tip
Coloration on Metallic Leading Edge tip
and material deposit
This document is for internal use only. It is not a training document and does not replace
official
CFM International 18
CFM Proprietary
is subject to restrictions
Tech Ops Training materials. It cannot be used as approved
technicalInformation
data
C2 - Confidential
3. Tip visual aspects
b. Missing composite material
Missing composite material on tip
(side view)
This document is for internal use only. It is not a training document and does not replace official Tech
Ops Training materials. It cannot be used as approved technical data
CFM International 19
CFM Proprietary Information is subject to restrictions
C2 - Confidential
3. Tip visual aspects
c. Cracks
10 mm
Crack (fiber breakage) on tip
TE
10 mm
LE
Convex Side
Crack (fiber breakage) on tip
This document is for internal use only. It is not a training document and does not replace official Tech
Ops Training materials. It cannot be used as approved technical data
CFM International 20
CFM Proprietary Information is subject to restrictions
C2 - Confidential
3. Tip visual aspects
d. Rectangular indentation
Rectangular indentation visible on TIP behind the MLE (patch HFA)
Caution:
This cross section view of the fan blade does
not take into account the real dimensions of
the layers of polyurethane, primer and paint.
Glue patch
AIRFOIL
TE
Level 1 : Linear
indentation on
black paint
LE
Concave Side
Level 2 : Groove, black paint
elongated , primer maybe visible ,
glue fabric maybe visible
CFM International
This document is for internal use only. It is not a training document and does not replace
official Tech21
CFM Proprietary Information is subject to restrictions
Ops Training materials. It cannot be used as approved technical data
C2 - Confidential
4. Airfoil visual aspects
a. Coating paint peeling
Black paint peeling (concave side only):
When white primer still present
AIRFOIL
Black
paint
Primer
Starting from MLE
TE
LE
Concave Side
Starting from initial “impact”
mark from any location
REFERENCE : Fan blade coatings on concave side
LEAP-1A
LEAP-1B
P/N 362-040-908
P/N 364-040-902
P/N 362-040-909
P/N 364-040-904
Caution:
This cross section view of the fan blade does not take into account
the real dimensions of the layers of polyurethane, primer and paint.
This document is for internal use only. It is not a training document and does not replace official Tech
CFM International 22
Ops Training materials. It cannot be used as approved technical
data Information is subject to restrictions
CFM Proprietary
C2 - Confidential
4. Airfoil visual aspects
b. Coating Paint spalling and erosion
AIRFOIL
Paint Spalling (concave side only):
Black paint and primer loss
PU film
Primer
TE
LE
Blister
Concave Side
Black
paint
Paint erosion
(concave side only)
Primer
Black
paint
REFERENCE : See Fan blade coatings on concave side page 21
This document is for internal use only. It is not a training document and does not replace official Tech
CFM International 23
CFM Proprietary
Ops Training materials. It cannot be used as approved technical
data Information is subject to restrictions
C2 - Confidential
4. Airfoil visual aspects
c. Decohesion Vs Cracks in painted areas (1/2 )
Multiple indented lines on paint surface
=
First steps before paint flaking
LE
TE
Convex Side
Cracks (fiber breakage)
This document is for internal use only. It is not a training document and does not replace official Tech
Ops Training materials. It cannot be used as approved technical data
CFM International 24
CFM Proprietary Information is subject to restrictions
C2 - Confidential
4. Airfoil visual aspects
d. Decohesion Vs Cracks in painted areas (2/2 )
This document is for internal use only. It is not a training document and does not replace official Tech
CFM International 25
CFM
Proprietary
Information
is
subject
to restrictions
Ops Training materials. It cannot be used as approved technical data
C2 - Confidential
4. Airfoil visual aspects
e. Coating MLE and Tip areas
Missing coating (Paint and PU film)
LE
TE
Convex Side
Missing paint on MLE
(Metallic Leading Edge)
Missing primer on MLE
(Metallic Leading Edge)
This document is for internal use only. It is not a training document and does not replace
official Tech
CFM International 26
CFM Proprietary
Ops Training materials. It cannot be used as approved technical
data Information is subject to restrictions
C2 - Confidential
4. Airfoil visual aspects
f. Nick on concave side
Black paint
Primer
PU Film
Composite
material
Concave Side
REFERENCE : Fan blade coatings on concave side
LEAP-1A
LEAP-1B
P/N 362-040-908
P/N 364-040-902
P/N 362-040-909
P/N 364-040-904
Caution:
This cross section view of the fan blade does not take into account
the real dimensions of the layers of polyurethane, primer and paint.
This document is for internal use only. It is not a training document and does not replace official Tech
Ops Training materials. It cannot be used as approved technical data
CFM International 27
CFM Proprietary Information is subject to restrictions
C2 - Confidential
4. Airfoil visual aspects
g. Scratches
LE
TE
Convex Side
Scratches limited to the paint
with primer visible
Scratches limited to the paint
This document is for internal use only. It is not a training document and does not replace official Tech
Ops Training materials. It cannot be used as approved technical data
CFM International 28
CFM Proprietary Information is subject to restrictions
C2 - Confidential
4. Airfoil visual aspects
h. Tear
Yellow color : In case of missing PU, the color of
the PU glue, in the ambient air, changes color, and
from transparent it gradually becomes yellow.
This document is for internal use only. It is not a training document and does not replace official Tech
Ops Training materials. It cannot be used as approved technical data
CFM International 29
CFM Proprietary Information is subject to restrictions
C2 - Confidential
4. Airfoil visual aspects
i. Indentation line, coatings visual aspect
Indentation line visible at the
transition between metallic leading
edge and composite material
Waviness aspect
Orange peel aspect
This document is for internal use only. It is not a training document and does not replace official Tech
Ops Training materials. It cannot be used as approved technical data
CFM International 30
CFM Proprietary Information is subject to restrictions
C2 - Confidential
4. Airfoil visual aspects
j. Porosity
Porosity visible on coating
LE
TE
Convex Side
Porosity visible in resin
This document is for internal use only. It is not a training document and does not replace official Tech
Ops Training materials. It cannot be used as approved technical data
CFM International 31
CFM Proprietary Information is subject to restrictions
C2 - Confidential
5. Dovetail and shank
a. Decohesion Vs Cracks in
non painted areas
4mm
Decohesion and micro-cracks
→ only around fibers
4mm
Fiber Resin
This document is for internal use only. It is not a training document and does not replace official Tech
Ops Training materials. It cannot be used as approved technical data
CFM International 32
CFM Proprietary Information is subject to restrictions
C2 - Confidential
5. Dovetail and shank
b. Decohesion in non painted areas
LE
TE
Convex Side
10 mm
Radial decohesion visible
on trailing edge wearstrip
Decohesion in composite material
This document is for internal use only. It is not a training document and does not replace official Tech
CFM International 33
Ops Training materials. It cannot be used as approved technical
data Information is subject to restrictions
CFM Proprietary
C2 - Confidential
5. Dovetail and shank
c. Resin micro-cracking
4mm
LE
TE
Convex Side
MLE glue
4mm
Resin micro-cracking
into composite material
This document is for internal use only. It is not a training document and does not replace official Tech
CFM International 34
CFM Proprietary Information is subject to restrictions
Ops Training materials. It cannot be used as approved technical data
C2 - Confidential
6. Wearstrips visual aspects
a. Wearstrips description (1/3)
1A: 362-040-908-0
1B: 364-040-902-0
1A: 362-040-908-0
1B: 364-040-902-0
+ polypaste repair
C-C
C-C
Note:
PU = Polyurethane
AF 191 = Adhesive
WS = Wearstrip
1A: 362-040-909-0
1B: 364-040-904-0
1A: 362-040-911-0
1B: 364-040-907-0
C-C
C-C
Concave Side
This document is for internal use only. It is not a training document and does not replace official Tech
Ops Training materials. It cannot be used as approved technical data
CFM International 35
CFM Proprietary Information is subject to restrictions
C2 - Confidential
6. Wearstrips visual aspects
b. Wearstrips description (2/3)
CONCAVE SIDE
6 wearstrips :
Platform wearstrip
CONVEX SIDE
Dovetail wearstrip
Platform wearstrip
Dovetail wearstrip
Leading
edge
wearstrip
Trailing
edge
wearstrip
This document is for internal use only. It is not a training document and does not replace official Tech
CFM International 36
Ops Training materials. It cannot be used as approved technical
CFM Proprietary
data
Information is subject to restrictions
C2 - Confidential
6. Wearstrips visual aspects
c. Wearstrips description (3/3)
2 type of wearstrips colors:
TE
LE
Convex Side
Concave Side
Brown Platform Wearstrip
Grey Platform Wearstrip
This document is for internal use only. It is not a training document and does not replace official Tech
Ops Training materials. It cannot be used as approved technical data
CFM International 37
CFM Proprietary Information is subject to restrictions
C2 - Confidential
6. Wearstrips visual aspects
d. Erosion, wear
Concave Side
Wear on platform wearstrip not through to
the composite
Wear on platform wearstrip through to the
composite (concave side only)
TE
LE
Polypaste repair wear (concave side only)
Wear on dovetail wearstrip not
through to the composite
Wear on leading edge wearstrip not
through to the composite
This document is for internal use only. It is not a training document and does not replace
Tech 38
CFMofficial
International
CFM Proprietary Information is subject to restrictions
Ops Training materials. It cannot be used as approved technical data
C2 - Confidential
6. Wearstrips visual aspects
e. Frayed, disbonded corner
Frayed and disbonded dovetail wearstrip
LE
TE
Convex Side
Frayed dovetail wearstrip
Frayed and disbonded
dovetail wearstrip
CFM International 39
This document is for internal use only. It is not a trainingCFM
document
and
does notis subject
replacetoofficial
Tech
Proprietary
Information
restrictions
Ops Training materials. It cannot be used as approved technical data
C2 - Confidential
6. Wearstrips visual aspects
f. Coloration
Convex Side
LE
TE
Black coloration on
platform wearstrip
Black coloration on leading
edge wear strip
This document is for internal use only. It is not a training document and does not replace official Tech
CFM International 40
CFM Proprietary Information is subject to restrictions
Ops Training materials. It cannot be used as approved technical data
C2 - Confidential
Disclaimer :
The information in the following pages are a help for our
customers regarding the findings which can be found on the fan
blade after a particular event such as a FOD (Foreign Object
Damage), Birdstrike, icing, …
However, CFM recommends to customers to pay attention to the
fact that these information are only a help, and have value only
for learning.
These information cannot, in any way, represent the
completeness of all the findings which can be found after an
event.
Example: a Birdstrike caused by a small bird of 0.5 lbs will not
have the same effects as a large bird of 6 lbs.
As a consequence :
CFM reminds that all inspections after an event of any kind must
be carried out in accordance with tasks in existing manuals,
required by Airworthiness rules.
This document is for internal use only. It is not a training document and does not replace official Tech
Ops Training materials. It cannot be used as approved technical data
CFM International 41
CFM Proprietary Information is subject to restrictions
C2 - Confidential
A. Typical findings in the CFM experience
after Birdstrike event
Top view
Composite
decohesion,
crack/tear at tip,
behind MLE
MLE disbonding and
deformation
Composite
crack/tear at TE
Tip
View from TE
Microcracks in MLE
adhesive
Composite cracks,
tears and fibers
breakage at TE
Surface microcracks in
resin at shank
Cracks in resin on radius
This document is for internal use only. It is not a training document and does not replace official Tech
Ops Training materials. It cannot be used as approved technical data
CFM International 42
CFM Proprietary Information is subject to restrictions
C2 - Confidential
B. Typical findings in the CFM experience
after Icing event
Concave Side
TE
: Possibility of cracks and/or
decohesion on the TE
LE
Missing PU on Tip fan blade on concave and convex side
Missing material composite on Tip fan blade
This document is for internal use only. It is not a training document and does not replace official Tech
Ops Training materials. It cannot be used as approved technical data
CFM International 43
CFM Proprietary Information is subject to restrictions
C2 - Confidential
C. Typical findings in the CFM experience
after fan blade seized in abradable
Crack or decohesion of
composite fiber on TE
This document is for internal use only. It is not a training document and does not replace official Tech
CFM International 44
CFM Proprietary Information is subject to restrictions
Ops Training materials. It cannot be used as approved technical data
C2 - Confidential
Reference : 18 fan blades drawing
Drawing can be used as template for findings reporting in field
Note: Fan disk slot number 1 identified on each side of the slot. Fan blade number 1
placed in front of the top vertical point of the Platform front shroud (spherical indentation
on its surface).
This document is for internal use only. It is not a training document and does not replace official Tech
Ops Training materials. It cannot be used as approved technical data
CFM International 45
CFM Proprietary Information is subject to restrictions