TextPartly OCR
Some pages are OCR from a scan. OCR can misread letters and numbers.
Query with SQL
duckdb -csv -c "SELECT p.page, p.text_source, p.text, f.rights_holder, f.license FROM 'https://openairdocs.org/data/latest/service_document_file_page.parquet' p JOIN 'https://openairdocs.org/data/latest/service_document_file.parquet' f USING (file_sha256) WHERE p.file_sha256 = 'd002c6cfda23a69dc9d58f75b458429557833d6b8ebf13f7dba43c4d51278358' ORDER BY p.page"
Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.
SELECT p.page, p.text_source, p.text, f.rights_holder, f.license FROM 'https://openairdocs.org/data/latest/service_document_file_page.parquet' p JOIN 'https://openairdocs.org/data/latest/service_document_file.parquet' f USING (file_sha256) WHERE p.file_sha256 = 'd002c6cfda23a69dc9d58f75b458429557833d6b8ebf13f7dba43c4d51278358' ORDER BY p.page
Run it at the DuckDB prompt, or in any tool that reads Parquet over HTTPS. More ways to query the release are on Use the data.
TRANSMITT AL SHEET CFM
INTERNA TIONAL CFM56-7B SER VICE
BULLETIN 72-1019,
REVISION 1 - ENGINE - F AN AND
BOOSTER
ASSEMBL Y (72-21-00) - ONE TIME UL
TRASONIC
INSPECTION OF HIGH TIME F AN BLADES DOVET AILS JUNE 13, 2017 This page transmits Revision 1 to CFM56-7B Service Bulletin 72-1019 dated March 24, 2017.
This Service Bulletin has been revised to modify the compliance recommendation.
Consequently , the following paragraphs have been updated:
1.C.
Compliance to modify the compliance recommendation.
3.
ACCOMPLISHMENT INSTRUCTIONS;
paragraph
3.B.(4) removed reference table 2, 3 and
4.
3.
ACCOMPLISHMENT INSTRUCTIONS;
paragraph
3.C.(1) and
3.C.(2) modified and added new figure references.
3.
ACCOMPLISHMENT INSTRUCTIONS;
paragraph
3.D.
added caution and new figure reference.
Engines that have previously complied with this Service Bulletin are not af fected.
The vertical dash in the left-hand margin indicates change.
A change, which does not af fect the technical content, may not be highlighted in the T ransmittal Sheet.
This Service Bulletin is reissued in its entirety .
ENGINE - Fan and Booster Assembly (72 - 21 -
00) - One time Ultrasonic Inspection of high time Fan Blades Dovetails 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 regulatory 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.
All technical documentation and information contained herein, with respect to assembly and disassembly , cleaning, inspection methods and limits, repair methods and limits, operational limits, life limits and the like, have been developed and approved for use with engines and parts that have been manufactured and/or approved by CFM and that have been maintained in accordance with CFM technical documentation and recommendations.
CFM has no contractual or legal obligation for , nor knowledge of, non - CFM - approved parts and repairs.
Accordingly , this document is not intended to apply to non - CFM - approved parts and repairs.
CFM56 - 7B S/B 72 - 1019 Revision 1, , P AGE 1 of 26
ENGINE - Fan and Booster Assembly (72 - 21 -
00) - One time Ultrasonic Inspection of high time Fan Blades Dovetails
1.
PLANNING
INFORMA TION A.
Ef fectivity CFM56 - 7B20, - 7B22, - 7B24, - 7B26, - 7B27 CFM56 - 7B22/B1, - 7B24/B1, - 7B26/B1, - 7B26/B2, - 7B27/B1, - 7B27/B3 CFM56 - 7B20/3, - 7B22/3, - 7B24/3, - 7B26/3, - 7B27/3 CFM56 - 7B22/3B1, - 7B24/3B1, - 7B26/3B1, - 7B26/3B2, - 7B26/3F , - 7B26/3B2F CFM56 - 7B27/3B1, - 7B27/3B3, - 7B27/3F , - 7B27/3B1F CFM56 - 7B20E, - 7B22E, - 7B24E, - 7B26E, - 7B27E CFM56 - 7B22E/B1, - 7B24E/B1, - 7B26E/B1, - 7B26E/B2, - 7B26E/F CFM56 - 7B26E/B2F , - 7B27E/B1, - 7B27E/B3, - 7B27E/F , - 7B27E/B1F CFM56 - 7B20/2, - 7B22/2, - 7B24/2, - 7B26/2, - 7B27/2
(1) CFM56 - 7B Engines with Fan Blades 340 - 001 - 022 - 0, 340 - 001 - 026 - 0, 340 - 001 - 027 - 0, 340 - 001 - 028 - 0, 340 - 001 - 029 - 0, 340 - 001 - 036 - 0, 340 - 001 - 037 - 0, 340 - 001 - 038 - 0 and 340 - 001 - 039 - 0 are af fected by this Service Bulletin.
B.
Description This Service Bulletin recommends to perform a one time ultrasonic inspection on Fan Blades 340 - 001 - 022 - 0, 340 - 001 - 026 - 0, 340 - 001 - 027 - 0, 340 - 001 - 028 - 0, 340 - 001 - 029 - 0, 340 - 001 - 036 - 0, 340 - 001 - 037 - 0, 340 - 001 - 038 - 0 and 340 - 001 - 039 - 0, installed on CFM56 - 7B engines.
Engines that have previously complied with this service bulletin are not af fected.
Both concave and convex Blade root pressure faces have to be inspected.
C.
Compliance Category
2.
CFM recommends that you do this service bulletin as soon as possible and not later than September 24th, 2017 for engines that have accumulated more than 15,000 Flight Cycles (FC) since last shop visit at the date of March 24th 2017.
CFM56 - 7B S/B 72 - 1019 Revision 1, , P AGE 1
ENGINE - Fan and Booster Assembly (72 - 21 -
00) - One time Ultrasonic Inspection of high time Fan Blades Dovetails NOTE 1 :
Engines that cross the threshold of 15,000 FC since last shop visit after the date of March 24th 2017 are not af fected.
NOTE 2 :
For definition of an engine shop visit, refer to service bulletin 72 - 0972 - ENGINE - General (72 - 00 -
00) - Definition of Shop V isit for CFM56 - 7B Engines.
NOTE 3 :
Engines where the complete set of fan blades have been inspected per ECI SUBT ASK 72 - 21 - 01 - 350 - 069 - 0 per Engine Shop Manual task 72 - 21 - 01 - 200 - 001 within the compliance time of this service bulletin satisfies the requirements of this Service Bulletin.
NOTE 4 :
This Service Bulletin can be accomplished on wing.
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).
D.
Concurrent Requirements None.
E.
Reason
(1) Objective:
T o do an inspection of Fan Blades dovetails with ultrasonic technique.
(2) Condition:
One Fan Blade separation occurred on a CFM56 - 7B with commanded engine IFSD.
(3) Cause:
Investigation has identified a crack that initiated and propagated in Fan Blade dovetail up to final separation.
(4) Improvement:
The ultrasonic inspection provides a method to detect cracks initiation in Fan Blade dovetails.
(5) Substantiation:
CFM56 - 7B S/B 72 - 1019 Revision 1, , P AGE 2
ENGINE - Fan and Booster Assembly (72 - 21 -
00) - One time Ultrasonic Inspection of high time Fan Blades Dovetails Substantiation is by analysis.
F .
Approval The technical content of this document is approved by the F AA and under the authority of DOA No.
EASA.21J.086.
G.
Manpower Y ou will need approximately two man - hours for each engine to do this Service Bulletin.
This estimation does not include the time needed to get access to the inspection areas.
H.
W eight and Balance W eight and balance are not changed.
I.
References CFM56 - 7B Engine Shop Manual, CFMI - TP .SM.10, A T A 72 - 23 - 00 Boeing 737 - 600/700/800/900 Aircraft Maintenance Manual (AMM) CFM56 Consumable Products Manual, CFMI - TP .CP .3.
J.
Publications Af fected None.
K.
Interchangeability The physical and the functional interchangeabilities are not af fected.
L.
Software Accomplishment Summary None.
2.
MA TERIAL
INFORMA TION A.
Material - Price and A vailability
(1) Parts necessary to do this Service Bulletin:
None.
(2) Other Spare Parts:
CFM56 - 7B S/B 72 - 1019 Revision 1, , P AGE 3
ENGINE - Fan and Booster Assembly (72 - 21 -
00) - One time Ultrasonic Inspection of high time Fan Blades Dovetails Part Number Qty/ Eng Part Name Unit $ Price Pkg Qty Lead T ime Days 340 - 161 - 304 - 0
(12) Blade, Pair Set - Fan 96,570.00
(1) 30
(3) Consumables:
Code Number Description CP1016 Pharmacological Glycerine CP1041 Isopropyl Alcohol B.
Industry Support Information None C.
Configuration Chart None.
D.
Disposition of Parts Contact your Customer Support Manager (CSM) for further information.
E.
T ooling - Price and A vailability The following items are supplied with inspection kit GE - CFMI - 723:
ITEM QTY P AR T NUMBER
DESCRIPTION 1 2 00 - 010032 Convex Side T ransducer 2 2 00 - 010106 Concave Side T ransducer 3 2 07 - 010008 Cable, 6’, BNC to Suhner Connector 4 1 UT - 2370 Calibration Standard 5 500 ml G - 33 Laboratory Grade Glycerin 6 1 2087 - 0016 500 ml Dispensing Bottle 7 1 1416 Platt Carrying Case 8 1 NA Label CFM56 - 7B S/B 72 - 1019 Revision 1, , P AGE 4
ENGINE - Fan and Booster Assembly (72 - 21 -
00) - One time Ultrasonic Inspection of high time Fan Blades Dovetails The inspection kit containing all required tooling can be obtained from CFM by contacting the following address:
E - mail:
ndttooling@ge.com
3.
ACCOMPLISHMENT
INSTRUCTIONS A.
Inspection Procedure:
(1) Remove the Fan Blades.
Refer to AMM, T ASK 72 - 21 - 02 - 000 - 801 (Fan Blade Removal (Complete Set)).
NOTE :
During removal of the fan blades, number the position of the fan blade shims (for engines with fan blade shims) in order to keep record of the mapping of the shims.
In case of indication on one fan blade during inspection per this service bulletin, it will be required to remove the related fan blade shim.
(2) Clean and visually inspect the removed Fan Blades.
Refer to AMM, T ASK 72 - 21 - 02 - 200 -
801.
(3) Do the ultrasonic inspection as follow:
NOTE 1 :
Personnel performing this inspection shall be certified in accordance with one of the following:
.
NAS410 .
American Society of Non - Destructive T esting (SNT - TC - 1A) .
Air T ransport Association Specification No.
105 (A T A
105) .
COSAC .
Locally approved certification program NOTE 2 :
Personnel performing this inspection shall receive practical training in the use of this procedure and must demonstrate proficiency in calibration of the inspection equipment, inspection of hardware, and evaluation of indications, before the authority to accept and reject hardware is delegated.
NOTE 3 :
T raining which may be provided regarding the performance of this inspection does not imply that the requirements of Note 1 have been met.
CFM56 - 7B S/B 72 - 1019 Revision 1, , P AGE 5
ENGINE - Fan and Booster Assembly (72 - 21 -
00) - One time Ultrasonic Inspection of high time Fan Blades Dovetails
(a) Do the initial equipment setup as per paragraph
3.B.
(b) Do the system calibration for dovetail concave side pressure face inspection as per paragraph
3.C.(1).
(c) Do the inspection of the 24 Fan Blades dovetail concave side as per paragraph
3.D.
Refer to Figure
4.
1 If you find repeatable indication, do the indication evaluation procedure as per paragraph
3.F .
(d) Do the post calibration procedure as per paragraph
3.E.
(e) Do the system calibration for dovetail convex side pressure face inspection as per paragraph
3.C.(2).
(f) Do the inspection of the 24 Fan Blades dovetail convex side as per paragraph
3.D.
1 If you find repeatable indication, do the indication evaluation procedure as per paragraph
3.F .
(g) Do the post calibration procedure as per paragraph
3.E.
(4) Clean the Fan Blades with Isopropyl Alcohol (CP1041) to remove couplant.
(5) Install the Fan Blades.
Refer to AMM, T ASK 72 - 21 - 02 - 400 - 801 (Fan Blade Installation (Complete Set)) or AMM, T ASK 72 - 21 - 02 - 900 - 801 (Fan Blade Replacement (Complete Set)).
(6) Record all requested information on the inspection data sheet in and return it to local CFM representative (or through a CSC case).
Refer to
4.
APPENDIX A:
Calibration and Inspection Data Sheet .
B.
Initial Equipment Setup:
NOTE 1 :
The instruments listed in T able 1 are approved for use with this procedure, but are not supplied with the inspection kit GE - CFMI -
723.
Contact CFM for information regarding approval of additional instruments.
NOTE 2 :
Refer to the manufacturer ’ s equipment manual for the ultrasonic instrument being utilized for this inspection if any questions arise about the instrument’ s use.
CFM56 - 7B S/B 72 - 1019 Revision 1, , P AGE 6
ENGINE - Fan and Booster Assembly (72 - 21 -
00) - One time Ultrasonic Inspection of high time Fan Blades Dovetails
(1) Connect the ultrasonic instrument to the appropriate power source and switch the instrument power on.
Allow the instrument to warm up for at least 30 minutes or the manufacturer ’ s recommended warm up time.
(2) Connect the BNC end of the coaxial cable to the ultrasonic instrument.
(3) Connect the transducer to the other end of the coaxial cable.
(4) Adjust the ultrasonic instrument to the basic settings in T able 1 .
C.
System Calibration:
NOTE :
This inspection is performed using two dif ferent dedicated ultrasonic transducers to direct a refracted shear wave into the area of interest in the convex and concave side dovetail edge of contact.
The calibration routine is the same but requires a separate calibration for each transducer prior to inspection.
(1) T ransducer 00 - 010106, Inspection of the dovetail concave side pressure face.
(a) Prepare the ultrasonic instrument and transducer as per paragraph
3.B.
(b) Apply a liberal amount of couplant Pharmacological Glycerine (CP1016) to the concave side of the calibration standard.
Refer to Figure 2 .
(c) Place the transducer on the calibration standard until it seats properly .
Refer to Figure 3 .
(d) Observe the initial pulse at
0.0 on the baseline.
With transducer coupled to the part, scan the area of the Side Drilled Hole (SDH).
(e) Scan the transducer across the calibration standard until the SDH is detected and maximize the response.
The SDH response should appear between
8.0 and
9.0 on the horizontal baseline.
Refer to Figure 7 .
NOTE :
Calibration Standard Correction Factors – Because of the dif ferences in the response resulting from possible variations in the fabrication process, calibration standards may have amplitude correction factors (equivalent responses) applied to them.
The Quality T echnology Laboratory will establish these equivalent responses by comparing the response from the GE Laboratory Master Standard to the response from each subordinate standard.
In cases where an equivalent response is required, this equivalent response applies to the calibration only and does not alter the amplitudes specified for indication evaluation.
CFM56 - 7B S/B 72 - 1019 Revision 1, , P AGE 7
ENGINE - Fan and Booster Assembly (72 - 21 -
00) - One time Ultrasonic Inspection of high time Fan Blades Dovetails
(f) With the peak amplitude displayed, adjust the instrument gain until the response from the SDH is at 80% of Full Screen Height (FSH) (or the appropriate correction factor).
(g) Adjust the instrument probe delay so that the leading edge of the response from the entry surface (wedge signal) is at
0.0 on the instrument horizontal baseline.
Refer to Figure 8 .
(h) Using the instrument range control, adjust the response from the SDH so the leading edge is at
7.0 on the horizontal baseline.
(i) Scan the transducer back and forth on the calibration standard to confirm that the response from the SDH is at 80% FSH (or the appropriate correction factor).
(j) Adjust the gate from
6.0 to
8.0 with the gate threshold set to 30%.
(k) Note and record the instrument settings on inspection data sheet in
4.
APPENDIX A:
Calibration and Inspection Data Sheet .
(2) T ransducer 00 - 010032, Inspection from the convex dovetail side pressure face:
(a) Prepare the ultrasonic instrument and transducer as per paragraph
3.B.
(b) Apply a liberal amount of couplant Pharmacological Glycerine (CP1016) to the convex side of the calibration standard.
Refer to Figure 2 .
(c) Place the transducer on the calibration standard until it seats properly .
Refer to Figure 4 .
(d) Observe the initial pulse at
0.0 on the baseline.
With transducer coupled to the part, scan the area of the SDH.
(e) Scan the transducer across the calibration standard until the SDH is detected and maximize the response.
The SDH response should appear between
8.0 and
9.0 on the horizontal baseline.
Refer to Figure 7 .
(f) With the peak amplitude displayed, adjust the instrument gain until the response from the SDH is at 80% of FSH (or the appropriate correction factor).
(g) Adjust the instrument probe delay so that the leading edge of the response from the entry surface (wedge signal) at
0.0 on the instrument horizontal baseline.
Refer to Figure 8 .
(h) Using the instrument range control, adjust the response from the SDH so the leading edge is at
7.0 on the horizontal baseline.
CFM56 - 7B S/B 72 - 1019 Revision 1, , P AGE 8
ENGINE - Fan and Booster Assembly (72 - 21 -
00) - One time Ultrasonic Inspection of high time Fan Blades Dovetails
(i) Scan the transducer back and forth on the calibration standard to confirm that the response from the SDH is at 80% FSH (or the appropriate correction factor).
(j) Adjust the gate from
6.0 to
8.0 with the threshold at 30%.
(k) Note and record the instrument settings on inspection data sheet in
4.
APPENDIX A:
Calibration and Inspection Data Sheet .
D.
Hardware Inspection:
(1) Prepare the transducer being used as per paragraph
3.C.
NOTE :
Due to Fan Blade variability , it may be necessary to add 6 dB of gain above the calibration sensitivity for inspection.
This additional gain can be added at the operator ’ s discretion to visually determine there is enough ultrasonic background noise present during inspection to make sure that the probe is coupled to the Fan Blade dovetail properly .
(2) Position the Fan Blade so that the dovetail root is accessible for the side being inspected.
(3) Beginning at the leading edge of the Fan Blade Dovetail root radius apply a liberal amount of couplant Pharmacological Glycerine (CP1016) from the leading edge to the trailing edge.
(4) Place the transducer being used on the dovetail area near the leading edge until it is seated properly .
CAUTION :
EXCESSIVE
COUPLANT MA Y
ACCUMULA TE IN FRONT OF THE
TRANSDUCER A T THE EDGE OF THE
PRESSURE F ACE AND CAN CAUSE
IRRELEV ANT INDICA TIONS T O APPEAR IN THE
INSPECTION ZONE.
IF THIS
HAPPENS, REMOVE THE EXCESS
COUPLANT WITH A CLEAN CLOTH.
(5) With the transducer seated properly , slowly scan the transducer assembly towards the trailing edge until the transducer is slightly of f the edge of the Fan Blade.
Use the centerline of the assembly for visual reference.
This can also be identified by monitoring the noise signals on the instrument display .
Scan speed should be approximately 1/2 inches per second
(1.27 cm per second).
Refer to Figure 5 .
(6) Add 6 dB of gain for inspection sensitivity if necessary .
(Calibration Level +6 dB).
(7) Reverse the direction of the scan and continue scanning towards the leading edge of the Blade.
Continue until the complete dovetail is scanned.
CFM56 - 7B S/B 72 - 1019 Revision 1, , P AGE 9
ENGINE - Fan and Booster Assembly (72 - 21 -
00) - One time Ultrasonic Inspection of high time Fan Blades Dovetails
(8) Continue until the two scans have been made across the area of interest.
(9) Monitor the instrument for any indication that is equal to or exceeds 30% FSH in the inspection zone.
(10) Evaluate repeatable indications which are equal to or exceed 30% FSH and are in the gated region of the instrument display as per paragraph
3.F .
(1
1) Upon completion of the inspection area, document the results on the inspection sheet in
4.
APPENDIX A:
Calibration and Inspection Data Sheet .
E.
Post Calibration:
NOTE :
A calibration check shall be performed upon the completion of each inspection, whenever any system component or operator is changed, at least once every hour , or any time the operator suspects a change may have occurred in the system.
(1) If necessary , remove the additional 6 dB of gain added for inspection sensitivity as per paragraph
3.D.(6).
(2) If the response from the SDH beats to within +/– 10% FSH of the initial calibration amplitude, the calibration check is acceptable.
(3) If the amplitude from the SDH response has decreased more than 10%, the system must be re - calibrated and all hardware inspected since the last acceptable calibration must be re - inspected.
(4) If the SDH response has increased by more the 10% FSH, the system must be re - calibrated prior to inspection of additional hardware and any rejected hardware must be re - inspected.
F .
Indication Evaluation:
(1) Any indication(s) that equals or exceeds 30% FSH and is in the gated region of the instrument display shall be evaluated.
NOTE :
For indication evaluation, all evaluations shall be performed at calibration sensitivity .
(If 6 dB of gain was added during inspection make sure it has been removed from the inspection sensitivity before performing calibration).
(2) Perform a post calibration check as per paragraph
3.E.
(3) Clean the area on the dovetail with an approved solvent and cloth.
(4) Repeat the inspection as described in paragraph
3.D.
CFM56 - 7B S/B 72 - 1019 Revision 1, , P AGE 10