Hydraulic Power − Hydraulic Systems No. 1 and No. 2 − Detailed Inspection of the Accumulator Screw−Caps Threads

These pages transmit: Revision B of Service Bulletin 670BA−29−013, pages 1 thru 17, dated Dec 22/2010. and Initial Issue of Appendix A pages A1 thru A9, dated Jan 29/2010.
The changes in this revision have no effect on aircraft that have incorporated a previous issue of this service bulletin

Reason:

Revised Planning Information, paragraph 1., to:
Add a note and remove serial numbers 60206−001T thru 60206−020T from Table 1 of Compliance paragraph 1.D. Add Bombardier Regional Jet Series All Operator Message (AOM), No. 614, Parker Service Information Letter 900096−29−225, and to change Parker Service Bulletin 900096

– 1

– 29

– 391 Revision 1 for Revision 2 in References paragraph 1.K.

This revision also includes small editorial changes that do not have an effect on the technical content.

Document Instructions: Discard the copy of Service Bulletin 670BA−29−013, Revision A, dated Jul 27/2010. Replace with the copy attached. 

### SERVICE BULLETIN 670BA−29−013

S.B. 670BA−29−013 Page 1 of 2 Dec 22/2010 

# SERVICE BULLETIN REVISION TRANSMITTAL SHEET

CL−600−2C10, CL−600−2D15, CL−600−2D24 and CL−600−2E25 CANADAIR REGIONAL JET (CRJ) AIRCRAFT

SUBJECT:Service Bulletin History: Initial issue, dated Jan 29/2010. Revision A, dated Jul 27/2010. 

### SERVICE BULLETIN 670BA−29−013

S.B. 670BA−29−013 Page 2 of 2 Dec 22/2010Hydraulic Power − Hydraulic Systems No. 1 and No. 2 − Detailed Inspection of the Accumulator Screw−Caps Threads

1. PLANNING INFORMATION A. Effectivity (1) Aircraft Affected:
Service Bulletin: CL−600−2C10 Canadair Regional Jet (CRJ) Aircraft with the component part numbers/serial numbers that follow installed:

PART NUMBER: 900096−1

Serial Number: Serial numbers without letter ‘M’ at the end: For the list of the serial numbers refer to Compliance paragraph 1.D., TABLE 1. NOTE: For the serial numbers listed in Compliance paragraph 1.D., TABLE 2, it is necessary to incorporate Parker Service Bulletin 900096−1−29−391.
Installed at the time of delivery on aircraft serial numbers: 10003 thru 10258 

# SERVICE BULLETIN

ATA SYSTEM: 29−11 NUMBER: 670BA−29−013

S.B. 670BA−29−013 Page 1 of 17 Jan 29/2010 Revision B, Dec 22/2010 Technical Publications

THIS SERVICE BULLETIN IS SENT TO EACH OPERATOR. IF THE OPERATOR HAS LEASED AIRCRAFT, THIS SERVICE BULLETIN MUST BE SENT TO THE LESSEE. IF THE OPERATOR HAS SOLD AIRCRAFT OR TRANSFERRED SPARES IN THE LAST SIX MONTHS, THIS SERVICE BULLETIN MUST BE SENT TO THE NEW OWNER, UNLESS CONFIRMATION WAS RECEIVED THAT BOMBARDIER COMMERCIAL AIRCRAFT DIVISION HAS INCLUDED THE NEW OPERATOR ON THE DISTRIBUTION LIST.

SUBJECT:PART NUMBER: 900096−1

Spares: Examine all spare parts. If a part, with a serial number listed above, is found, it is necessary to incorporate Parker Service Bulletin 900096−1−29−391.
CL−600−2C10 If parts, with the serial numbers listed above, are installed on aircraft that were not identified at the time of delivery, on the same or on a different aircraft model, it is necessary to incorporate Parker Service Bulletin 900096−1−29−391.

Production: There is no production effectivity.

Service Bulletin: CL−600−2D15 Canadair Regional Jet (CRJ) and CL−600−2D24 Canadair Regional Jet (CRJ) Aircraft with the component part numbers/serial numbers that follow installed:

PART NUMBER: 900096−1

Serial Number: Serial numbers without letter ‘M’ at the end: For the list of the serial numbers refer to Compliance paragraph 1.D., TABLE 1. NOTE: For the serial numbers listed in Compliance paragraph 1.D., TABLE 2, it is necessary to incorporate Parker Service Bulletin 900096−1−29−391.
Installed at the time of delivery on aircraft serial numbers: 15001 thru 15081, 15083, and 15084

Spares: Examine all spare parts. If a part, with a serial number listed above, is found, it is necessary to incorporate Parker Service Bulletin 900096−1−29−391. 

### SERVICE BULLETIN 670BA−29−013

S.B. 670BA−29−013 Page 2 of 17 Jan 29/2010 Revision B, Dec 22/2010PART NUMBER: 900096−1

CL−600−2D15 and CL−600−2D24 If parts, with the serial numbers listed above, are installed on aircraft that were not identified at the time of delivery, on the same or on a different aircraft model, it is necessary to incorporate Parker Service Bulletin 900096−1−29−391.

Production: There is no production effectivity.

NOTE : The instructions in this service bulletin are only applicable to the systems and parts installed at the time of delivery of the aircraft or as changed by Bombardier Service Bulletin(s). Before you do this bulletin, examine all STC, STA or equivalent action changes to make sure this bulletin can be completed.

B. Reason (1) Condition It is possible to have a thread interference in the thread engagement between the screw−caps and the end−caps of accumulators 900096−1. (2) Evidence A CL600−2B19 in−service aircraft had a screw−cap disconnect from the body of the outboard brake accumulator. Analysis shows that defective end−caps were also installed on the hydraulic system No. 1 and No. 2 accumulators of CL600−2C10, CL−600−2D15, and CL−600−2D24 aircraft. (3) Objective/Benefit This service bulletin gives the procedure to do an ultrasonic inspection on the screw−caps of the accumulator of hydraulic systems No. 1 and No. 2. The inspection will make sure that no end−caps with cracks are installed on the accumulator. This will prevent the separation of the end−caps from the accumulator assembly. C. Description The hydraulic pressure of applicable system No. 1 and/or No. 2 is released. Circuit breakers are opened. The aft equipment−compartment door is opened. The nitrogen pressure of the applicable hydraulic system No. 1 and/or No. 2 accumulator(s) is released. 

### SERVICE BULLETIN 670BA−29−013

S.B. 670BA−29−013 Page 3 of 17 Jan 29/2010 Revision B, Dec 22/2010The applicable system No. 1 and/or No. 2 accumulator(s) is removed. An ultrasonic inspection is done on the screw−caps of the applicable accumulator of hydraulic system No. 1 and/or No. 2. If a crack is found, the applicable accumulator(s) is replaced. If no crack is found, the applicable accumulator(s) is installed. The circuit breakers are closed. The replenishment of the applicable hydraulic system No. 1 and/or No. 2 accumulator(s) and reservoir(s) is done. The hydraulic system No. 1 and/or No. 2 is bled. The functional test of the applicable hydraulic system No. 1 and/or No. 2 accumulator pressure decay rate is done. The aft equipment−compartment door is closed. D. Compliance Recommended Service Bulletin.
NOTE : It is not necessary to do this service bulletin when Service Bulletin 670BA−29−014, Hydraulic Power − Hydraulic System No. 1 and No. 2 − Replacement of Accumulator P/N 900096−1 by P/N 900121−1, is done. Bombardier Aerospace recommends that this service bulletin be done as shown in the table below, unless otherwise directed by the airworthiness authority of the operator:
NOTE : The letter ‘M’ identifies that new screw caps were installed on the accumulator: − The accumulator was made and delivered with letter ‘M‘ at the end of the serial number. OR − The accumulator was changed by Parker Service Bulletin SB 900096−1−29−391.

Applicable Compliance Results Action

For hydraulic system No. 1 and No. 2:
Accumulators P/N 900096−1 with serial numbers without letter ‘M’ at the end (For the list of serial numbers see TABLE 1 and the note below). For accumulators that have 4000 flight cycles or less, it is necessary to do this service bulletin before the accumulators have 5000 flight cycles. If there is an indication of a crack during the ultrasonic inspection, it is necessary to replace the accumulator before next flight.

or If no indication of a crack is found, no action is necessary before next flight. It is necessary to repeat this service bulletin every 500 flight cycles from the initial inspection. For accumulators that have more than 4000 flight cycles, it is necessary to do this service bulletin no more than 1000 flight cycles from the issue date on this service bulletin. 

### SERVICE BULLETIN 670BA−29−013

S.B. 670BA−29−013 Page 4 of 17 Jan 29/2010 Revision B, Dec 22/2010Applicable Compliance Results Action
For hydraulic system No. 1 and No. 2:
Accumulators P/N 900096−1 with serial numbers with letter ‘M’ at the end. It is not necessary to do this service bulletin. 

### SERVICE BULLETIN 670BA−29−013

S.B. 670BA−29−013 Page 5 of 17 Jan 29/2010 Revision B, Dec 22/2010TABLE 1

60206−0001 thru 60206−0010 60206−0012 thru 60206−0015 60206−0017 thru 60206−0019 60206−0021 thru 60206−0024 60206−0026 thru 60206−0041 60206−0043 thru 60206−0045 60206−0047 thru 60206−0049 60206−0052
60206−0054 thru 60206−0057 60206−0059
60206−0061 thru 60206−0069 60206−0072 thru 60206−0074 60206−0076 thru 60206−0079 60206−0081
60206−0084 thru 60206−0085 60206−0088 thru 60206−0091 60206−0093 thru 60206−0106 60206−0108
60206−0110 thru 60206−0119 60206−0121 thru 60206−0126 60206−0129
60206−0131 thru 60206−0140 60206−0142 thru 60206−0153 60206−0157 thru 60206−0163 60206−0166 thru 60206−0173 60206−0175 thru 60206−0177 60206−0180
60206−0182 thru 60206−0202 60206−0204 thru 60206−0218 60206−0220 thru 60206−0229 60206−0231 thru 60206−0249 60206−0251 thru 60206−0256 60206−0258 thru 60206−0259 60206−0262 thru 60206−0264 60206−0266 thru 60206−0279 60206−0281 thru 60206−0290 60206−0292
60206−0294 thru 60206−0300 60206−0303 thru 60206−0332 60206−0334 thru 60206−0351 60206−0353
60206−0355 thru 60206−0396 60206−0398 thru 60206−0408 60206−0410 thru 60206−0415 60206−0417 thru 60206−0427 60206−0429 thru 60206−0439 60206−0441 thru 60206−0461 60206−0463 thru 60206−0494 60206−0496 thru 60206−0498 60206−0501 thru 60206−0502 60206−0504 thru 60206−0527 60206−0530 thru 60206−0553 60206−0555 thru 60206−0566 60206−0568 thru 60206−0580 60206−0582 thru 60206−0590 60206−0592 thru 60206−0597 60206−0599 thru 60206−0622 60206−0624 thru 60206−0627 60206−0629 thru 60206−0630 60206−0632
60206−0634 thru 60206−0643 60206−0645 thru 60206−0658 60206−0660 thru 60206−0674 60206−0677 thru 60206−0679 60206−0682 thru 60206−0684 60206−0687 thru 60206−1003 60206−1005 thru 60206−1017 60206−1019 thru 60206−1031 60206−1033 thru 60206−1051 60206−1053 thru 60206−1054 

### SERVICE BULLETIN 670BA−29−013

S.B. 670BA−29−013 Page 6 of 17 Jan 29/2010 Revision B, Dec 22/2010NOTE : For serial numbers listed in TABLE 2 below, the new screw caps were installed by Parker, but it is necessary to incorporate Parker Service Bulletin 900096−1−29−391 to add the letter ‘M’ at the end of the serial numbers.

TABLE 2

60206−0011 60206−0016A 60206−0020 60206−0025 60206−0042A 60206−0046 60206−0050 60206−0051 60206−0053 60206−0058A 60206−0060A 60206−0070 60206−0071A 60206−0075A 60206−0080 60206−0082 60206−0083 60206−0086 60206−0087 60206−0092A 60206−0107 60206−0109B 60206−0120 60206−0127 60206−0128 60206−0130 60206−0141 60206−0154 60206−0155A 60206−0156 60206−0164 60206−0165 60206−0174 60206−0178 60206−0179 60206−0181 60206−0203 60206−0219 60206−0230 60206−0250 60206−0257 60206−0260 60206−0261 60206−0265 60206−0280 60206−0291 60206−0293 60206−0301 60206−0302 60206−0333 60206−0352 60206−0354 60206−0397 60206−0409 60206−0416 60206−0428 60206−0440 60206−0462 60206−0495 60206−0499 60206−0500 60206−0503 60206−0528 60206−0529 60206−0554 60206−0567 60206−0581 60206−0591 60206−0598 60206−0623 60206−0628 60206−0631 60206−0633 60206−0644 60206−0659 60206−0675 60206−0676 60206−0680 60206−0681 60206−0685 60206−0686 60206−1004 60206−1018 60206−1032 60206−1052 60206−1055 thru 60206−1514

This service bulletin does not affect Airworthiness Limitations (AWLs) or Damage Tolerance Inspections (DTIs). E. Approval The technical content of this service bulletin has been approved under the authority of the TCCA Design Approval Organization No: DAO #93−Q−02. F. Manpower The man−hours given below are an estimate for direct labor done by an experienced crew on an aircraft prepared for maintenance. This estimate does not include the time necessary for: − Administrative functions such as planning, liaison, familiarization, and report writing. − Non productive elapsed time such as rest time, having meals, and crew shift changes. 

### SERVICE BULLETIN 670BA−29−013

S.B. 670BA−29−013 Page 7 of 17 Jan 29/2010 Revision B, Dec 22/2010− Elapsed time such as for paint to dry, sealant to cure, and fuel tank venting. − Preparation for modification (unless specified in the accomplishment instructions) such as cleaning and getting parts, tools, consumables, and ground equipment. − Quality assurance inspections, troubleshooting and/or correction of discrepancies found when a task is done. − All other activities that are not considered by Bombardier as directly related to the accomplishment of this procedure.
NOTE : For on−site labor assistance, please speak with a Fleet Services representative for a quote. The Fleet Services team can be contacted via the CRC at 514−855−8500 or email at thd.crj@aero.bombardier.com. It will take an estimated 5.5 man−hours to complete this service bulletin. The man−hours are divided as shown in the table that follows:

TASK MAN−HOURS
(1) Job Set−Up 1.0 (2) Procedure 3.0 (3) Test 1.0 (4) Job Close−Out 0.5
G. Material − Price and Availability
There are no kits for this service bulletin. (1) Refer to paragraph 3.B. for a list of consumables for this service bulletin. H. Tooling − Price and Availability (1) The tool kit in the table that follows is available from Bombardier.
NOTE : For a list of the kit contents, refer to paragraph 3.A. 

### SERVICE BULLETIN 670BA−29−013

S.B. 670BA−29−013 Page 8 of 17 Jan 29/2010 Revision B, Dec 22/2010KIT NUMBER NAME

670BA29013K90 NDT Calibration Tool Kit

NOTE : 670BA32026K90, 601R29−033K90, or 601R32−106K90, NDT calibration tool kit can be used as an alternative kit. (2) Please send a purchase order to the address below to schedule the kit:
Bombardier Service Bulletin Kit Support Team 123 Garratt Blvd, N42−24 Toronto, Ontario Canada M3K 1Y5 Fax: 416−375−3060 Phone: 416−375−3920 email: sbkits@aero.bombardier.com Please contact your Service Bulletin Kit Support Team at the address above for terms and conditions. (3) Refer to paragraph 3.C. for a list of special tools and equipment for this service bulletin. I. Weight and Balance Not changed.
J. Electrical Load Data Not changed.
K. References − Restriction and/or Special Instruction (RSI), C−29−1186−00, Revision A. − Parker Service Bulletin 900096−1−29−391, Revision 2, dated Sept 30/2010. − Bombardier Regional Jet Series All Operator Message (AOM), No. 614.
− Parker Service Information Letter 900096−29−225. − Aircraft Maintenance Manual (AMM), CSP B−001. − Nondestructive Testing Manual (NDT), CSP B−010. 

### SERVICE BULLETIN 670BA−29−013

S.B. 670BA−29−013 Page 9 of 17 Jan 29/2010 Revision B, Dec 22/2010− For Bombardier reference only: PCA 73521.
L. Other Publications Affected
None. M. Relationship Chart Not applicable. 

### SERVICE BULLETIN 670BA−29−013

S.B. 670BA−29−013 Page 10 of 17 Jan 29/2010 Revision B, Dec 22/20102. ACCOMPLISHMENT INSTRUCTIONS A. Job Set−Up (1) Reference Information

REFERENCE DESIGNATION
AMM 12−00−00−867−801 Standard Aircraft Configuration for Maintenance
AMM 12−00−06−862−802 Release Hydraulic Pressure of System No. 1 and No. 2
AMM 12−12−29−611−801 Servicing of the Hydraulic System No. 1 and No. 2 Reservoirs
AMM 12−12−29−614−801 Servicing of the Hydraulic System Accumulators
AMM 24−00−00−910−801 Electrical/Electronic Safety Precautions
AMM 29−00−00−910−802 Hydraulic Technical Precautions
AMM 29−10−00−870−801 Bleed Hydraulic Systems No. 1 and No. 2
AMM 29−11−11−000−801 Removal of the System No. 1 and No. 2 Accumulator
AMM 29−11−11−400−801 Installation of the System No. 1 and No. 2 Accumulator
AMM 29−11−11−720−803 Functional Test of the System No. 1 and No. 2 Accumulator Pressure Decay Rate
(2) Make sure that the aircraft is in standard configuration for maintenance (AMM 12−00−00−867−801). 

### SERVICE BULLETIN 670BA−29−013

S.B. 670BA−29−013 Page 11 of 17 Jan 29/2010 Revision B, Dec 22/2010WARNING : OBEY ALL THE SAFETY PRECAUTIONS WHEN YOU DO MAINTENANCE ON OR NEAR ELECTRICAL/ELECTRONIC EQUIPMENT. YOU CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT. (3) Obey all the electrical/electronic safety precautions (AMM 24−00−00−910−801). (4) Obey all hydraulic technical precautions(AMM 29−00−00−910−802).
WARNING : MAKE SURE THAT THE WHEEL CHOCKS AND THE GROUND LOCKPINS FOR THE LANDING GEAR ARE INSTALLED BEFORE YOU RELEASE THE HYDRAULIC PRESSURE. ACCIDENTAL MOVEMENT OF THE AIRCRAFT CAN CAUSE INJURIES TO PERSONS AND/OR DAMAGE TO EQUIPMENT. (5) Release the hydraulic pressure from applicable hydraulic system No. 1 and/or No. 2 (AMM 12−00−06−862−802). (6) For hydraulic system No. 1, open, safety, and tag the circuit breaker that follows:

CB−PANEL CB NO. NAME CBP−2 F13 HYD SYST AC PUMP CONT 1
(7) For hydraulic system No. 2, open, safety, and tag the circuit breaker that follows:

CB−PANEL CB NO. NAME CBP−1 F14 HYD SYST AC PUMP CONT 2
(8) Open aft equipment−compartment door 311BB. 

### SERVICE BULLETIN 670BA−29−013

S.B. 670BA−29−013 Page 12 of 17 Jan 29/2010 Revision B, Dec 22/2010Refer to Figure 1.
WARNING : USE PROTECTIVE GLOVES TO CAREFULLY LOOSEN THE VALVE NUT ON THE NITROGEN CHARGING VALVE. KEEP YOUR HANDS AWAY FROM THE NITROGEN LEAKAGE. THE NITROGEN LINE IS PRESSURIZED AND CAN CAUSE INJURY. (9) Release the nitrogen pressure from the applicable hydraulic system No. 1 and/or No. 2 accumulator(s) (1) as follows: (a) Remove the dust cap (4) from the pressure gauge (5). (b) Carefully loosen the nut (3) on the pressure gauge (5) and monitor the pressure on the pressure gauge (5) while the pressure decreases. (c) Let the nitrogen pressure go to zero, and tighten the nut (3). (d) Install the dust cap (4) on the pressure gauge (5).
B. Procedure Refer to Figure 1. (1) Remove the applicable hydraulic system No. 1 and/or No. 2 accumulator(s) (1) (AMM 29−11−11−000−801). (2) Do an ultrasonic inspection on the screw−caps (2) of the applicable hydraulic system No. 1 and/or No. 2 accumulator(s) (Refer to Appendix A). (3) If there is a crack, do as follows: (a) Send the accumulator(s) to: Bombardier Aerospace CRJ In Service Engineering 13100 Boulevard Henri−Fabre, Mirabel, Quebec, Canada J7N 3C6 C/O ISE group, Dept#662 (b) Install the applicable new hydraulic system No. 1 and/or No. 2 accumulator(s) (1) (AMM 29−11−11−400−801). (4) If there is no crack, install the applicable hydraulic system No. 1 and/or No. 2 accumulator(s) (1) (AMM 29−11−11−400−801). 

### SERVICE BULLETIN 670BA−29−013

S.B. 670BA−29−013 Page 13 of 17 Jan 29/2010 Revision B, Dec 22/2010A

C

E A

B

E E

D

C

C D NO. 1 HYDRAULIC SYSTEM SERVICE PANELba5779a01.cgm NO. 2 HYDRAULIC SYSTEM SERVICE PANEL (REF) 1

2 1 2

1

1 NOTE Inspection area. 1 LEGEND 1. System accumulator. 2. Screw cap. 3. Nut. 4. Dust cap. 5. Pressure gauge.

5

3

4 NO. 2 SYSTEM

B NO. 1 SYSTEM 

### SERVICE BULLETIN 670BA−29−013

Accumulator − Installation/Removal Figure 1

S.B. 670BA−29−013 Page 14 of 17 Jan 29/2010 Revision B, Dec 22/2010C. Job Close−Out (1) Remove all tools, equipment, and unwanted materials from the work area. (2) For hydraulic system No. 1, remove the tag and close the circuit breaker that follows:

CB−PANEL CB NO. NAME CBP−2 F13 HYD SYST AC PUMP CONT 1
(3) For hydraulic system No. 2, remove the tag and close the circuit breaker that follows:

CB−PANEL CB NO. NAME CBP−1 F14 HYD SYST AC PUMP CONT 2
(4) Replenish the hydraulic system No. 1 and/or No. 2 accumulator(s) (AMM 12−12−29−614−801). (5) Replenish the hydraulic system No. 1 and/or No. 2 reservoir(s) (AMM 12−12−29−611−801). (6) Bleed hydraulic system No. 1 and/or No. 2 (AMM 29−10−00−870−801). (7) Do the functional test of the accumulator pressure−decrease rate for the applicable accumulator(s) of hydraulic system No. 1 and/or No. 2 (AMM 29−11−11−720−803). (8) Close aft equipment−compartment door 311BB. (9) When this service bulletin is completed, make this entry in the applicable logbook(s): "Service Bulletin 670BA−29−013, Revision B, Hydraulic Power − Hydraulic Systems No. 1 and No. 2 − Detailed Inspection of the Accumulator Screw−Caps Threads, incorporated". 

### SERVICE BULLETIN 670BA−29−013

S.B. 670BA−29−013 Page 15 of 17 Jan 29/2010 Revision B, Dec 22/20103. MATERIAL INFORMATION
A. Kit Information
Kit Content:

KIT 670BA29013K90

PART NUMBER QUANTITY NAME ALTERNATE PART(S) NOTES

T11828 1 NDT Calibration Tool Kit

B. Consumable Information The materials that follows are necessary to do this service bulletin and can be ordered from Bombardier or purchased directly from industry sources. If the material is ordered from Bombardier, there can be some lead time because of shelf life of the material.

CONSUMABLES

SPECIFICATION QUANTITY NAME REFERENCE

MIL−C−85043 As necessary Cloths, cleaning, low lint 05−001 [1]

TT−I−735 As necessary Alcohol isopropyl 05−001 [1]

[1] Refer to AMM 51−31−00−992−801.

NOTE : To complete this list of consumables, refer to the different tasks, the Parker service bulletin and Appendix A given as references in this service bulletin. C. Special Tools and Equipment For a list of special tools and equipment, refer to the different tasks, the Parker service bulletin and Appendix A given as references in this service bulletin. 

### SERVICE BULLETIN 670BA−29−013

S.B. 670BA−29−013 Page 16 of 17 Jan 29/2010 Revision B, Dec 22/2010D. Disposition of Parts Not applicable. 

### SERVICE BULLETIN 670BA−29−013

S.B. 670BA−29−013 Page 17 of 17 Jan 29/2010 Revision B, Dec 22/2010Jan 29/2010 APPENDIX A Page A1 of A9 

## PROCEDURE

The procedure contained in this appendix is given as references in the ACCOMPLISHMENT INSTRUCTIONS of Service Bulletin 670BA-29-013.

### Appendix A

Jan 29/2010 APPENDIX A Page A2 of A9 Ultrasonic Inspection of the Hydraulic Sy stem No.1 and No.2 Accumulators – Thread of the Screw caps

1. General

A. Function Refer to Figure A1. This inspection procedure is used to det ect subsurface cracks at the internal thread root near the end of t he internal shoulder of the screw caps (gas and fluid ends) of the hydraulic systems No.1 and No.2 accumulators.

B. Reference Information

For additional data that is necessary to do this inspection, refer to manuals that follow: - Nondestructive Testing Manual (NDT M CSP B-010) Part 1, 51-20-004-270, General Information. - Structural Repair Manual (SRM). - Aircraft Maintenance Manual (AMM).
C. Location The inspection area is in Zone 31 1 (Refer to AMM 06-20-00-992-801). D. Parts Examined in this procedure

DESCRIPTION ACCUMULATOR PART NUMBER SCREW CAP PART NUMBER MATERIAL

Hydraulic-System Accumulator 900096-1 08-8421-104 7075-T73 Al Alloy

### Appendix A

Jan 29/2010 APPENDIX A Page A3 of A9 2. Tools and Equipment
A. Use the items that follow, or their equivalent (Refer to the NDTM Part 1, 51-20- 004-270). NOTE: Equivalent ultrasonic equipment c an be used provided that it satisfies the requirements of this procedure and is capable of resolving the reference notch(es) in the calibration refer ence standard (CRS) at the required level of sensitivity.

- Ultrasonic flaw detecto r, Sonatest Model: UFSD - Potted angle beam contact transduc er, 70 degrees refractive angle in

aluminum, 5.0 MHz frequency, contact surface 0.32-inch (8.13 mm) by 0.70-inch (17.78 mm) UTX Model: CX-118 - Microdot to BNC type coaxial cable.
- Tactair Calibration Reference Standard: T11828, similar in geometry as the

part to be inspected containing several electrical discharge machined (EDM) notches (Refer to Figure A2 ). - Inspectech LTD: Gorptech Industrial Ultrasonic Couplant Gel. 3. Inspection for Subsurface Cracks on th e Screw-Cap Internal Thread of the Hydraulic System No.1 and No.2 Accumulators A. Cleaning Refer to Figure A1.
WARNING: OBEY ALL THE SAFETY PRECAUTIONS WHEN YOU USE CHLORINATED OR OTHER SOLVENTS TO CLEAN THE WORK SURFACES. MAKE SURE THAT THERE IS A SUFFICIENT SUPPLY OF FRESH AIR. U SE PROTECTIVE CLOTHING AND SAFETY GLASSES. IF THIS IS NOT DONE, INJURIES TO PERSONS CAN OCCUR. (1) With solvent, clean the entire (360 degrees around) tapered section of the screw caps where the transducer is to make contact during the inspection. Refer to AMM 51-26-00-110-801.

### Appendix A

Jan 29/2010 APPENDIX A Page A4 of A9 B. Equipment Calibration Refer to Figure A2 and Figure A3. NOTE: Make sure that you follow t he manufacturer's instructions when operating the test equipment.
NOTE: Do not allow the ultr asonic couplant to dry on the inspection surface. If necessary, add more couplant, to replenish the surface. (1) Attach the 70° angle beam transdu cer to coaxial cable and connect the cable to the ultrasonic instrument. (2) Turn on the power and set the ultr asonic instrument to pulse-echo test mode and 5 MHz test frequency. (3) Apply couplant to tapered section of the calibration reference standard (CRS) T11828. (4) Place the transducer firmly to the tapered section on the CRS such that sound beam is directed up to slope of the tapered section towards the internal thread of the screw cap. (5) Manipulate the transducer to obtai n a maximized amplitude signal from EDM notch A (NA) in the root of t he thread and adjust the instrument GAIN control to set the signal at 80% full scr een height (FSH) (Refer to Figure A2 and A3).
CAUTION: THERE WILL BE A SLIGHT NOISE ARISING FROM THE THREADS DURING THE SCAN. MAKE SURE THAT IT IS NOT GREATER THAN 30% FSH. (6) Adjust range control to position t he leading edge of t he notch signal at approximately 50% of the horizontal baseline (Refer to Figure A3). C. Inspection Procedure Refer to Figure A3. (1) After calibration as outlined in secti on 3.B., apply an even layer of couplant to the tapered section on the accumu lator screw cap to be inspected. (2) Place the transducer firmly to the tapered section of the Screw Cap such that the sound beam is directed up the slope of the tapered section towards the internal threads.

### Appendix A

Jan 29/2010 APPENDIX A Page A5 of A9 (3) Manipulate the transducer towards and away from the threads with slight swiveling motion. (4) Inspect 360 degrees around the cap for cracks.

D. Evaluation of Indications (1) Any indication with an amplitude si gnal of 60% FSH or greater at approximately 50% of the horizontal baseline limit is considered a suspect indication and is cause for further evaluation. (2) If the indication is a crack, determi ne the approximate length of crack by scanning in both directions from the peak signal until the signal has dropped to 40% FSH and mark the center point of the transducer. The circumferential crack length is t he distance between the two points. E. Acceptance or Rejection Criteria: (1) All distinct indications with an am plitude signal of 60% FSH or greater appearing at approximately 50% of the horizontal base line is classified as a crack indication and is caused for rejection. (2) Record results.

### Appendix A

Jan 29/2010 APPENDIX A Page A6 of A9 Hydraulic System Accumula tor Screw Cap Locations Figure A1

### Appendix A

Jan 29/2010 APPENDIX A Page A7 of A9 Tactair CRS Number T11828 Figure A2

### Appendix A

Jan 29/2010 APPENDIX A Page A8 of A9 CRT Display Calibration and Familiarization Figure A3 (Sheet 1 of 2)

### Appendix A

Jan 29/2010 APPENDIX A Page A9 of A9 CRT Display Calibration and Familiarization Figure A3 (Sheet 2 of 2)THANK YOU FOR ANSWERING THIS EVALUATION FORM UPON COMPLETION OF THIS EVALUATION FORM/COMPLIANCE SHEET, FAX TO 450-476-7300 

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