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 22/2010
Hydraulic 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 22/2010
PART

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 22/2010
The 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 22/2010
Applicable 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 22/2010
TABLE 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 22/2010
NOTE: 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 22/2010
KIT 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 22/2010
2. 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 22/2010
WARNING: 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 22/2010
Refer 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 22/2010
A

C

E

A

B

E

E

D

C

C D

NO. 1 

HYDRAULIC SYSTEM 

SERVICE PANEL

ba5779a01.cgm

NO. 2 HYDRAULIC

SYSTEM SERVICE

PANEL (REF)

1

2

1

2

1

1

NOTE

1 Inspection area.

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 22/2010
C. 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 22/2010
3. 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 22/2010
D. 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 22/2010
 

Jan 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 System 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 detect subsurface cracks at the internal 

thread root near the end of the 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 (NDTM 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 311 (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 can be used provided that it satisfies the 

requirements of this procedure and is capable of resolving the reference 

notch(es) in the calibration reference standard (CRS) at the required 

level of sensitivity. 

- Ultrasonic flaw detector, Sonatest Model: UFSD 

- Potted angle beam contact transducer, 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 the 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. USE 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 the manufacturer's instructions when 

operating the test equipment. 

 

NOTE: Do not allow the ultrasonic couplant to dry on the inspection surface. If 

necessary, add more couplant, to replenish the surface. 

(1) Attach the 70° angle beam transducer to coaxial cable and connect the 

cable to the ultrasonic instrument. 

(2) Turn on the power and set the ultrasonic 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 obtain a maximized amplitude signal from 

EDM notch A (NA) in the root of the thread and adjust the instrument GAIN 

control to set the signal at 80% full screen 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 the leading edge of the 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 section 3.B., apply an even layer of couplant 

to the tapered section on the accumulator 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 signal 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, determine 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 the distance between the two points. 

E. Acceptance or Rejection Criteria: 

(1) All distinct indications with an amplitude signal of 60% FSH or greater 

appearing at approximately 50% of the horizontal baseline 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 Accumulator 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)
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