100-25-21

Page 1 of 1 

SERVICE BULLETIN 

REVISION TRANSMITTAL SHEET 

MODEL BD-100-1A10 (CL-300) 

Discard Revision 01 of this Service Bulletin dated May 02/2013 and replace in its 

entirety with this Revision 02. 

Service Bulletin No. 100-25-21

Date of Basic Issue Jun 30/2008

Revision No. 01 Dated May 02/2013

Revision No. 02 Dated Jul 25/2013

For action applicable to aircraft on which the Basic Issue of this Service Bulletin 

was done, refer to the retroactive action box on Page 1 of this Service Bulletin. 

This revision is issued to: 

1. Add, in the Summary Sheet, a Note in reference to Airworthiness Directive, TCCA 

AD # CF-2010-06. 

2. Add, in Paragraph 1.K., a reference to Airworthiness Directive, 

TCCA AD # CF-2010-06. 

3. Add, in Paragraph 1.K., a reference to Advisory Wire AW300-21-0083. 

4. Change, in Paragraph 3.C., the supplier information for Code B. 

5. Make miscellaneous minor changes, as necessary, with no change of context. 
Basic Issue: Jun 30/2008 100-25-21

Revision 02: Jul 25/2013 Page 1 of 1 

SERVICE BULLETIN SUMMARY 

This Service Bulletin is available at: 

www.cic.bombardier.com

BD-100-1A10 (CL-300)

ATA 25-80 

EQUIPMENT / FURNISHINGS 

SPECIAL CHECK/REWORK – INSULATION – REMOVAL OF POSSIBLE FOREIGN 

MATERIAL IN THE AREA OF THE SAFETY VALVES 

The information below is provided for your reference. For full details, please see 

corresponding paragraph contained within this bulletin. 

RECOMMENDED 

SPECIFIED TIME COMPLIANCE

COMPLIANCE TIME 

At the next maintenance opportunity, 

but no later than July 2014

EFFECTIVITY: A/C Serial No. 20003 to 20123, 20126, 20127, 20129 to 20133, 20135 

to 20138, 20140 to 20142, 20144, 20145 and 20147 

MANPOWER: See Paragraph 1.F. 

CONTINUED AIRWORTHINESS (CAW) 

FLEET CAMPAIGN 

YES NO 

KITS and/or PARTS YES NO 

TOOLING/GSE YES NO 

PLANNING INFORMATION: See important 

information at the start of Paragraph 1. YES NO 

DEDICATED SCHEDULE YES NO 

PREREQUISITE SERVICE BULLETINS: N/A 

NOTE: This Service Bulletin has an Airworthiness Directive, TCCA AD # CF-2010-06, 

which requires a revised maintenance schedule, cleaning of the safety valves 

and surrounding area and modification of the safety valves. 

To place an order for parts or kits, please call Bombardier Aerospace Parts Services at:

514-855-2999 or 1-866-538-1247
Refer to applicable governmental agency regulations and requirements and make sure that the work described in this 

Service Bulletin is performed in compliance with manufacturer’s recommendations and/or acceptable industry standards. 

This document is proprietary to Bombardier Inc. and/or its affiliates and may not be reproduced or copied in any form or 

by any means without the prior written consent of Bombardier Inc. and/or its affiliates. 

© 2008 - 2013 Bombardier Inc. All rights reserved 

Learjet, Challenger, Global, are registered trademarks of Bombardier Inc. or its subsidiaries. 

Basic Issue: Jun 30/2008 100-25-21

Revision 02: Jul 25/2013 Page 1 of 14 

SERVICE BULLETIN 

This Service Bulletin is available at: 

www.cic.bombardier.com

BD-100-1A10 (CL-300)

ATA 25-80 

EQUIPMENT / FURNISHINGS 

SPECIAL CHECK/REWORK – INSULATION – REMOVAL OF POSSIBLE FOREIGN 

MATERIAL IN THE AREA OF THE SAFETY VALVES 

RETROACTIVE ACTION 

THE ACTION THAT FOLLOWS IS RECOMMENDED FOR AIRCRAFT ON WHICH 

THE BASIC ISSUE OF THIS SERVICE BULLETIN WAS DONE: 

Do the Special Check/Rework as given in Paragraph 2.B., within the Compliance Time 

given in Paragraph 1.D. 

1. PLANNING INFORMATION 

A. Effectivity 

BD-100-1A10 aircraft, Serial No. 20003 to 20123, 20126, 20127, 20129 to 20133,

20135 to 20138, 20140 to 20142, 20144, 20145 and 20147. 

NOTES: 1. Refer to Service Bulletin 100-25-14 for BD-100-1A10 aircraft, 

Serial No. 20124, 20125, 20128, 20134, 20139, 20143, 20146, 20148 

to 20173, 20176 and 20177. 

2. The instructions given 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 Aerospace Service Bulletin(s). 

Before you do this bulletin, examine all STC, STA or equivalent 

action changes to make sure that this bulletin can be completed. 
MODEL BD-100-1A10 (CL-300) 

Basic Issue: Jun 30/2008 100-25-21

Revision 02: Jul 25/2013 Page 2 of 14 

B. Reason 

This Service Bulletin provides instructions to inspect for presence of foreign 

material in the area of the safety valves and contamination on the safety valves. 

Some events of cabin depressurization were reported and investigation 

demonstrated presence of black foam and incorrect installation of the insulation 

blankets in the area of the safety valves. Any loose debris in this area could 

possibly block the safety valves and lead to cabin depressurization. 

Further events of cabin depressurization were reported following incorporation of 

the Basic Issue of this Service Bulletin, thus, this revision gives improved 

instructions to clean the area in front of the safety valves. 

C. Description 

This Service Bulletin gives instructions to: 

– Get access to the safety valves, 

– Inspect for presence of foreign material in the area surrounding the safety 

valves, 

– Remove foreign material, as required, 

– Inspect safety valves for presence of contamination. 

– Inspect for correct installation of the insulation blankets in safety valve area. 

– Clean or replace safety valve(s), as necessary, and 

– Do the necessary tests to make sure the replaced safety valve(s) operate(s) 

correctly, as necessary. 

D. Compliance 

Revision 01 or subsequent, of this Service Bulletin is recommended at the next 

maintenance opportunity, but no later than July 2014. 

NOTE: This Service Bulletin is in reference to Advisory Wire AW300-21-0083. 
MODEL BD-100-1A10 (CL-300) 

Basic Issue: Jun 30/2008 100-25-21

Revision 02: Jul 25/2013 Page 3 of 14 

E. Approval 

The technical content of this Service Bulletin has been approved under 

the authority of Transport Canada Civil Aviation (TCCA) Design Approval 

Organization (DAO) No. DAO #93-Q-02. 

NOTES: 1. The technical content of this Service Bulletin is accepted by the 

FAA under the Canada/USA bilateral Aviation Safety Agreement. 

2. The technical content of this Service Bulletin is accepted by the 

JAA and by EASA in accordance with established procedures. 

F. Manpower 

NOTES: 1. The man-hours given are estimates to help you schedule the tasks 

given in this bulletin. The estimates are for direct labor performed by 

an experienced crew and do not include the time for familiarization, 

planning, aircraft preparation in hangar such as towing and 

positioning of scaffolds, removal of interior furnishings, repainting, 

supervision and inspection. 

For more information related to the manpower estimates, refer to 

SB 100-00-02. 

2. This Service Bulletin may require consumable materials that have 

specific curing times (refer to Paragraph 3.). The accumulated curing 

time is not included in the labor estimates and should be considered 

for planning purposes before you schedule this Service Bulletin. 

2 man-hours are necessary to do this special check/rework. 

2 additional man-hours are necessary to replace each safety valve, as required. 

Bombardier Aerospace pays for the labor to do this special check/modification 

until July 2014. 
MODEL BD-100-1A10 (CL-300) 

Basic Issue: Jun 30/2008 100-25-21

Revision 02: Jul 25/2013 Page 4 of 14 

G. Material – Cost and Availability 

If contamination that cannot be cleaned off is found per Paragraph 2.B.(4)(e), 

up to two safety valves, Part No. 81141A010303, may be necessary to do this 

Service Bulletin. The valves are available at no cost if a no-charge purchase 

order is sent to Bombardier Aerospace Parts Services before July 2014. For 

material data, refer to Paragraph 3. 

Send the removed safety valve(s), Part No. 81141A010303, to one of the two 

addresses given below in exchange for replacement unit(s): 

Learjet – Core Returns 

8219 West Irving, Bldg 9, Dock 9, 

Wichita, KS 67209 

USA 

or 

Distribution Centre Frankfurt – Core Returns 

Bombardier Aerospace Germany GmbH 

Hans-Boeckler-Strasse 9 

GROSS-GERAU Hesse 64521 

Germany 

Refer to your Material Return Authorization (MRA) form to find the applicable 

return address. 

NOTES: 1. Bombardier Aerospace is maintaining a rotable pool of replacement 

safety valves, to be supplied to the operators under the terms and 

conditions given below: 

– The removed safety valves(s), Part No. 81141A010303, must be 

returned to one of the addresses given above in less than 10 days 

of receipt of replacement unit(s) with documentation showing the 

serial number of the aircraft. 

– If the removed safety valves(s), Part No. 81141A010303, are not 

returned in less than 10 days, the operator will be charged for the 

replacement unit(s). 

2. On the no-charge purchase order, write “For incorporation of 

SB 100-25-21. 

During or after the above free period, Smart Parts Plus does not pay for 

the parts. 
MODEL BD-100-1A10 (CL-300) 

Basic Issue: Jun 30/2008 100-25-21

Revision 02: Jul 25/2013 Page 5 of 14 

H. Tooling 

The equipment and tools listed below may be necessary to do this special 

check/rework: 

GSE REFERENCE NO. PART NO. DESCRIPTION 

20X-00-04 M1-G-KIT Portable Bonding 

Tester, or equivalent 

21C-31-04 SBE2221 Cabin Pressurization 

Safety Valve – Test Kit 

21C-31-05 MIL-H-5593-4-156-1OE Adapter Hose Cabin 

Pressurization Safety 

Valve – Test Kit 

34C-10-04 ADTS-405F Air Data Test Set 

- Commercially Available Stopwatch 

- Commercially Available Wrench, Torque 

NOTES: 1. Refer to the BD-100 Illustrated Tool and Equipment Manual (ITEM) to 

make sure that you use the correct equipment configuration. 

2. Refer to the Liability Statement in the ITEM for acceptable GSE 

equivalents. 

3. This list is provided for quick reference. In case of discrepancy 

between this list and the tools called in the SPM, WM, Chapter 20, 

then the tools called in the SPM, WM prevail. Other approved 

alternative tools are acceptable and can also be used. 

I. Weight and Balance 

No change. 

J. Electrical Load Data 

No change. 
MODEL BD-100-1A10 (CL-300) 

Basic Issue: Jun 30/2008 100-25-21

Revision 02: Jul 25/2013 Page 6 of 14 

K. References 

– TCCA Airworthiness Directive, CF-2010-06. 

– Advisory Wire AW300-21-0083. 

– Bombardier Aerospace, Restriction and/or Special Instruction (RSI), 

C-100-000-21-0084, Rev. C. 

– BD-100 Aircraft Maintenance Manual (AMM), Chapters 6, 21, 25 and 51. 

– BD-100 Supplemental Maintenance Manual (SMM), Chapter 25. 

– BD-100 Aircraft Illustrated Parts Catalog (AIPC), Chapter 21. 

– Liebherr Aerospace Component Maintenance Manual (CMM), 21-31-40. 

– Service Not Incorporated Engineering Order (SNIEO), 1005351038 S1. 

– Bombardier Aerospace, Installation Drawing M2013282. 

– Bombardier Aerospace, SB 100-00-02, “Description and Policy”. 

L. Other Publications Affected 

None. 

M. Equivalent Service Bulletin 

None. 

2. ACCOMPLISHMENT INSTRUCTIONS 

NOTES: 1. All TASKs given in the procedures that follow are from the BD-100, 

Aircraft Maintenance Manual unless otherwise specified. 

2. All references made to zones, access panels and/or doors, are from 

the BD-100 Aircraft Maintenance Manual, Chapter 6. 

A. Aircraft Setup 

Remove the baggage compartment headliner to get access to the safety valve area 

and the insulation blankets between the pressure bulkhead (FS 669.76) and the 

lavatory bulkhead (FS 629.25). Refer to SMM Chapter 25-53-03. 
MODEL BD-100-1A10 (CL-300) 

Basic Issue: Jun 30/2008 100-25-21

Revision 02: Jul 25/2013 Page 7 of 14 

B. Special Check/Rework 

(1) Visually inspect for presence of: 

– Foreign material in the area surrounding the safety valves. 

– RTV silicone on all visible surfaces of the safety valves. Refer to Figure 1. 

– Contamination (e.g. RTV, dust, lint) on the pressure sensing port. Refer to 

Figure 1. 

– RTV or foam on the bulkhead structure. Refer to Figure 1. 

– Tape or insulation within approximately 0.5 in (12.7 mm) minimum from the 

safety valves opening. Refer to Figure 1. 

– Loose material, loose insulation, foam or any other foreign material in any 

part of the safety valve compartment and in the channel between the 

lavatory grill and the safety valve (above the baggage compartment 

ceiling). 

(2) Remove any foreign material, loose material, loose insulation and foam in 

the area surrounding the safety valves, in the safety valve compartment 

and in the channel between the lavatory grill and the safety valve (above 

the baggage compartment ceiling). There must be a clear path between 

the lavatory grill and the safety valves. 

(3) If RTV is found on the visible surfaces of the safety valves or on the Aft 

Pressure Bulkhead near the safety valves, do as follows: 

(a) Remove the RTV using a non-metallic scraper. 

(b) Clean the surfaces. Refer to TASK 51-25-00-110-801. 

(c) If the RTV cannot be removed from the visible surfaces of the safety 

valves, do as follows: 

(i) Remove the safety valve, Part No. 81141A010303. Refer to 

TASK 21-31-09-000-801. 

(ii) Send the safety valve, to the address shown in Paragraph 1.G. 

(iii) Install a new safety valve, Part No. 81141A010303. Refer to 

TASK 21-31-09-400-801. 

(iv) Do the electrical bonding test of the safety valve. Refer to SPM 

TASK 51-80-00-760-801. 

NOTE: Make sure that the resistance value is not more than 

0.5 ohm measured between the safety valve and the 

aircraft primary structure. 

(4) To check if there is any contamination (e.g. RTV, dust or lint) on the safety 

valve pressure sensing ports, do as follows: 

(a) Gently press the safety valve plunger to its fully open position to expose 

the outside diameter of the pressure sensing port conduit. Refer to 

Figure 1. 
MODEL BD-100-1A10 (CL-300) 

Basic Issue: Jun 30/2008 100-25-21

Revision 02: Jul 25/2013 Page 8 of 14 

(b) Visually inspect the outside diameter of the pressure sensing port conduit 

for the presence of contamination and release the safety valve plunger. 

(c) Visually inspect the inside diameter of the pressure sensing port conduit 

for presence of contamination. 

(d) For safety valves with no presence of contamination on the inside or 

outside diameter of the pressure sensing port conduit, go to Paragraph 

2.B.(5). 

(e) For safety valves with the presence of RTV or the presence of dust or lint 

contamination on the inside or outside diameter of the pressure sensing 

port conduit, do as follows: 

(i) Remove the safety valve, Part No. 81141A010303. Refer to 

TASK 21-31-09-000-801. 

(ii) Send the safety valve, to the address shown in Paragraph 1.G. 

(iii) Install a new safety valve, Part No. 81141A010303. Refer to 

TASK 21-31-09-400-801. 

(iv) Do the electrical bonding test of the safety valve. Refer to SPM 

TASK 51-80-00-760-801. 

NOTE: Make sure that the resistance value is not more than 

0.5 ohm measured between the safety valve and the 

aircraft primary structure. 

(5) Remove any loose tape, loose insulation and frayed insulation found within 

approximately 0.5 in (12.7 mm) from the safety valve openings. 

(6) If the minimum area of 0.5 in (12.7 mm) surrounding the safety valves cannot 

be cleared, trim the insulation as far as possible from the opening of the safety 

valve and secure with PSA tape, Part No. 70-1C-2. Refer to SPM 

TASK 51-28-01-390-803: 
MODEL BD-100-1A10 (CL-300) 

Basic Issue: Jun 30/2008 100-25-21

Revision 02: Jul 25/2013 Page 9 of 14 

View of Inspection Area around Safety Valves 

Figure 1 
MODEL BD-100-1A10 (CL-300) 

Basic Issue: Jun 30/2008 100-25-21

Revision 02: Jul 25/2013 Page 10 of 14 

(7) Make sure that the insulation blankets above the baggage compartment 

headliner are installed correctly. 

(a) Make sure that the insulation blankets do not hang down in the air 

channel between the lavatory grill and the safety valves. Refer to 

Figures 2 and 3. 

(b) Make sure that the adhesive tape is bonded correctly. 

C. Testing 

If one or both safety valves were replaced, do the functional test of the positive 

and negative pressure relief. Refer to TASK 21-31-09-720-801. 

D. Close-out 

(1) Remove all tools, equipment and unwanted materials from the aircraft. 

(2) Close the safety valve access panel. 

E. Recording 

When this Service Bulletin is completed, make an entry in the aircraft log and 

send the attached Incorporation Notice to Bombardier Business Aircraft Customer 

Services (BBACS). 

In an effort to improve the quality of our technical communications, we are 

requesting your feedback. Please take a moment to fill out our easy on-line 

Service Bulletin survey: 

http://csefeedback.aero.bombardier.com
MODEL BD-100-1A10 (CL-300) 

Basic Issue: Jun 30/2008 100-25-21

Revision 02: Jul 25/2013 Page 11 of 14 

3. MATERIAL INFORMATION 

A. Kit 

No kit is necessary to do this Service Bulletin. 

B. Parts 

The part that follows may be necessary to do this Service Bulletin and is available 

from Bombardier Aerospace Parts Services, Montreal: 

NEW 

PART NO. 

QTY ITEM USED 

PART NO. 

INSTRUCTIONS -

DISPOSITION 

81141A010303 Up to 2 Safety Valve 81141A010303 Refer to 

Paragraph 1.G. 

NOTE: The part number for the item listed above is subject to change without 

revision to this Service Bulletin. In case of discrepancy between this list 

and any other list, the Illustrated Parts Catalog prevails and shall be used 

to determine the latest part number. 

C. Material 

The consumable materials that follow, or equivalent, may be necessary to do this 

Service Bulletin. These can be purchased from a local supplier. Bombardier 

Aerospace does not pay for these consumables. 

DESCRIPTION PART 

No./NAME 

SPECIFICATION QUANTITY SUPPLIER

(See Note)

Acrylic 

Conformal 

Coating 

CT: 24 hours

Humiseal Type 1B15 As 

Necessary 

Code: A 

Tape, Pressure 

Sensitive 

70-1C-2” - As 

Necessary 

Code: B 

Solvent HFE71DA - As 

Necessary 

Code: C 

Brush, Paint, 

Natural or 

Synthetic 

Bristle 

- - As 

Necessary 

Code: D 

Lockwire - Monel, 0.032 in 

(0.81 mm) 

As 

Necessary 

Code: D 

Scraper, 

Non-metallic 

- - As 

Necessary 

Code: D 

Solvent - TT-1-735 

Grade A or B 

As 

Necessary 

Code: D 
MODEL BD-100-1A10 (CL-300) 

Basic Issue: Jun 30/2008 100-25-21

Revision 02: Jul 25/2013 Page 12 of 14 

NOTES: 1. Refer to the table that follows for each supplier’s address listed by 

codes. 

2. The Curing Time (CT), if applicable, for each consumable material 

is indicated with the description of each product. 

3. At time of release of this Service Bulletin, the information on the 

supplier was valid and accurate. In the event that this information 

has changed, the operator is encouraged to use the World Wide Web 

to find a local supplier. 

SUPPLIERS ADDRESSES BY CODES 

Code: A 

Humiseal Division of Chase Corp. 

128 First Street 

Pittsburgh, PA 15238 

U.S.A. 

Tel.: (8660) 932-0800 

Web Site: www.humiseal.com

Code: B 

E&H Laminating & Slitting Co. 

138 Grand Street 

Paterson, N.J. 07501 

U.S.A. 

Tel.: (973) 345-1725 

Fax: (973) 345-3224 

Web Site: www.ehlam.com

Code: C 

3M Center 

2501 Hudson Road 

Maplewood, Minnesota 55144-1000 

U.S.A. 

Tel.: (888) 364-3577 

Web Site: www.3m.com

Code: D 

Commercially Available 

D. Publications 

No publications required. 
Baggage Compartment Air Channel 

Figure 2 

Basic Issue: Jun 30/2008 Revision 02: Jul 25/2013 

100-25-21

Page 13 of 14

A 

A 

A-A

BLANKET

(FOAM)(REF)

FIRST LAYER OF INSULAT

SECOND LAYER OF I

(AIR CHANNE

BAGGAGE HEADLINER ASSY

(OVERHEAD PANEL LIGHT AND SMOKE DETEC

PSA TAPE

(BOTH SIDES)

SAFETY VALVE
Cross Section through Air Channel 

Figure 3 

Basic Issue: Jun 30/2008 Revision 02: Jul 25/2013 

100-25-21

Page 14 of 14
SERVICE BULLETIN EVALUATION FORM 

(Your ideas will help us provide better bulletins) 

SERVICE BULLETIN: 100-25-21 ISSUE: Rev. 02 DATED: Jul 25/2013 

 

TITLE: Special Check/Rework – Insulation – Removal of Possible Foreign Material in the Area 

of the Safety Valves 

In an effort to improve the quality of our technical communications, we are replacing 

the standard Service Bulletin Evaluation Form with an on-line Service Bulletin 

Survey and we are requesting your feedback. Please take a moment to fill out our 

easy on-line Service Bulletin survey: 

http://csefeedback.aero.bombardier.com
SERVICE BULLETIN INCORPORATION SHEET – “100-25-21” BOMBARDIER SUBMISSION

Upon completion of the Service Bulletin, please fill-in, fax to 

(514) 855-8798 or e-mail to Fracas at fracas.montreal@aero.bombardier.com

If your aircraft is registered on CAMP and you are reporting to them, 

please do not send the incorporation sheet to Bombardier. If your aircraft 

is on another tracking system, please contact Bombardier to make 

arrangements for automated data submission. 

 COMPLIED WITH

 Service Bulletin 

Number 

 Rev. * Parts 

Completed 

YES NO N/A Remarks/Reason 

 100-25-21 02 - 

 - - - 

 - - - 

Actual hours to accomplish Service Bulletin: 

* NOTES: 

 

 

1. Where the Service Bulletin is divided into a number of parts (e.g., PARTS A, B, 

C, D, etc.) which can be carried out separately, indicate only those parts 

completed at this time. 

2. For repetitive checks (usually PART A) only the initial check should be reported 

unless otherwise stated in the Service Bulletin. 

3. When more than one part is carried out at the same time, each part should be 

reported. 

 Aircraft Serial No. Aircraft Reg. No. 

 Airframe Hours: Airframe Landings 

 S.B. Incorporation date Service Order No. 

 (dd/mm/yy)

 Facility Incorporating S.B. 

 Name Signature Date 

 (dd/mm/yy) Signature not required if sent by E-Mail
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Bombardier Business Aircraft Customer Services (BBACS) 

P.O. Box 6087, Station Centre-ville 

Montréal, Québec, Canada H3C 3G9 

Attention: Customer Support Department, Maintenance Engineering 

-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --