Bombardier Service Bulletin 100-27-23

SPECIAL CHECK/MODIFICATION – HORIZONTAL STABILIZER –

REPLACEMENT OF HORIZONTAL STABILIZER TRIM ACTUATOR (HSTA) The information below is provided for your reference. For full details, including labor and part coverage, please see corresponding paragraph contained within this bulletin.

RECOMMENDED

SPECIFIED TIME COMPLIANCE

COMPLIANCE TIME Refer to Paragraph 1.D.

EFFECTIVITY: BD−100−1A10 aircraft, Serial No. 20003 to 20457 MANPOWER: Refer to Paragraph 1.F.

CONTINUED AIRWORTHINESS (CAW)

FLEET CAMPAIGN NOYES TLMC, CH 5 AFFECTED NOYES 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 may be subject to an Airworthiness Directive.

To place an order for part, please call Bombardier Parts Services at:

514−855−2999 or 1−866−538−1247

SERVICE BULLETIN SUMMARY my.businessaircraft.bombardier.com MODEL BD−100−1A10 (CH−300) ATA 27−40

FLIGHT CONTROLS Basic Issue: Oct 28/2024 100−27−23 Page 1 of 1 This Service Bulletin is available at:

SPECIAL CHECK/MODIFICATION – HORIZONTAL STABILIZER –

REPLACEMENT OF HORIZONTAL STABILIZER TRIM ACTUATOR (HSTA)

1. PLANNING INFORMATION NOTES:1 . Before you do this Service Bulletin, examine all STC, STA or equivalent action changes to make sure that this Service Bulletin can be completed.

2. This Service Bulletin is covered by a dedicated schedule. Dedicated schedules are used to reserve and manage inventory due to limited availability of rotable stock, parts and/or kits. Parts are limited, therefore, advance part scheduling with our In−Service Implementation Team (ISIT) is recommended prior to a maintenance visit. They can be reached at bacs_isit@aero.bombardier.com. The parts will be allocated on a first come first serve basis.

Should you require additional information, please contact your Regional Sales Manager (RM) or Field Service Representative (FSR).

For more information on dedicated schedules, refer to SB 100−00−002.

3. If the Horizontal Stabilizer Trim Actuator (HSTA) is removed, then the personnel necessary is as follows:

− two persons for the removal and installation of the HSTA;

− two persons for the rigging check of the pitch trim system; and − two persons for the operational test of the pitch trim system.

4. This Service Bulletin is also applicable for the HSTA’s in the operator’s stock room.

SERVICE BULLETIN my.businessaircraft.bombardier.com MODEL BD−100−1A10 (CH−300) ATA 27−40

FLIGHT CONTROLS 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.

 2024 Bombardier Inc. All rights reserved Learjet, Challenger, Global, are registered trademarks of Bombardier Inc. or its subsidiaries.

Basic Issue: Oct 28/2024 100−27−23 Page 1 of 11 This Service Bulletin is available at:

5. For any technical issues, contact Bombardier at SRPSA@aero.bombardier.com.

A. Effectivity BD−100−1A10 aircraft, Serial No. 20003 to 20457 with the Horizontal Stabilizer Trim Actuator (HSTA) Serial Numbers listed in the table that follows:

TABLE 1 - HSTA SERIAL NUMBERS PART NO. NOMENCLATURE SERIAL NUMBERS C47100−004 C47100−005

HORIZONTAL

STABILIZER

TRIM ACTUATOR 012, 014, 019, 044K, 064K, 073, 094, 099, 112, 131, 139, 141, 152, 162, 186, 249, 281, 319, 325K, 328, 350A, 352K, 357, 375, 403, 469, 591.

(See NOTE 2) NOTES: 1. 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 Service Bulletin(s).

2. Serial Numbers indicated in the Table are those known at the time of Service Bulletin release. This Service Bulletin applies whether or not suffix letters ’A’ or ’K’ appears following the Serial Number numerical digits.

B. Reason

1. Condition:

Bombardier (BA) has been advised that the overhaul required by Certification Maintenance Requirement (CMR) task 27−40−00−104* was not fully completed on some units. On the affected HSTAs, some of the parts that were required to be replaced as part of the overhauled task were re−installed in error. This condition has been isolated to 27 HSTAs that are installed on in service aeroplanes.

2. Objective/Benefit:

This Service Bulletin instructs to inspect the Horizontal Stabilizer Trim Actuator (HSTA) Serial Numbers and if applicable replace the HSTA and return the affected HSTA for rework.

C. Description This Service Bulletin gives instructions in PART A, to:

− Verify the HSTA Serial Number (S/N) in the airplane maintenance tracking records, or get access to the HSTA to do a visual check of the identification plate to make sure this Service Bulletin is applicable to your aircraft, − If applicable, do PART B of this Service Bulletin, and MODEL BD−100−1A10 (CH−300) Basic Issue: Oct 28/2024 100−27−23 Page 2 of 11

− If the HSTA Serial Number is not applicable, no further action is required.

This Service Bulletin gives instructions in PART B, to:

− Remove the affected HSTA, − Send the HSTA for rework, and − Install the HSTA.

After PART B:

− Do the necessary tests to make sure that the system operates correctly.

D. Compliance For affected HSTA serial numbers with Component Time Since New greater than or equal to 10,000FHs Recommended before the affected HSTAs Serial numbers have accumulated 14,500FHs (Component Time Since New) OR 7,500FCs (Component Cycles Since New) OR within 24 months from release of this Service Bulletin (Basic Issue), which ever comes first.

For affected HSTA serial numbers with Component Time Since New greater than or equal to 9,700FHs AND Component Time Since New less than 10,000FHs Recommended before the affected HSTAs Serial numbers have accumulated 14,500FHs (Component Time Since New) OR 7,500FCs (Component Cycles Since New) OR within 36 months from release of this Service Bulletin (Basic Issue), which ever comes first.

For affected HSTA serial numbers with Component Time Since New less than 9,700FHs Recommended before the affected HSTAs Serial numbers have accumulated 14,500FHs (Component Time Since New) OR 7,500FCs (Component Cycles Since New) OR within 48 months from release of this Service Bulletin (Basic Issue), which ever comes first.

NOTE: If it is not possible to complete all the instructions in this Service Bulletin because of the aircraft configuration, submit an SRPSA for analysis and get an approved disposition to complete this Service Bulletin. Standard SRPSA fees may apply. Refer to services section of myBombardier for the latest prices, rates and fees.

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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 EASA under the Canada/EU bilateral Aviation Safety Agreement.

F. Manpower NOTES: 1. The hours given are to help you schedule the tasks given in this Service Bulletin. The hours 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, refer to SB 100−00−002.

2. Labor hours are based on the fact that the modification will be done at the next scheduled maintenance task or inspection. Therefore no hours are allotted to prepare the aircraft for maintenance or to prepare for this Service Bulletin.

2 hours are necessary to do PART A of this Service Bulletin.

NOTE: 0.5 hour is necessary to do PART A of this Service Bulletin if the HSTA is not installed in an aircraft (example: HSTA in the stock room).

Bombardier does not pay for the labor to do PART A of this Service Bulletin.

20 hours are necessary to do PART B of this Service Bulletin.

The labor required to do PART B of this Service Bulletin is at no cost if:

− the work is done at Bombardier or Authorized Service Facilities (ASF), and − this Service Bulletin is scheduled in less than 14,500 flight hours (COMPONENT Time Since New) or 7500 flight cycles (COMPONENT Cycles Since New), whichever comes first.

G. Material − Cost and Availability No kit or material is necessary to do this Service Bulletin.

The part in Paragraph 3.B. is necessary to do PART B of this Service Bulletin.

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The part required to do PART B is available at no cost if:

− a no−charge purchase order is sent to Bombardier in less than 14,500 flight hours (COMPONENT Time Since New) or 7500 flight cycles (COMPONENT Cycles Since New), whichever comes first.

This Service Bulletin is covered by a dedicated schedule. Dedicated schedules are used to reserve and manage inventory due to limited availability of rotable stock, parts and/or kits. Parts are limited, therefore, advance part scheduling with our In−Service Implementation Team (ISIT) is recommended prior to a maintenance visit. They can be reached at bacs_isit@aero.bombardier.com. The parts will be allocated on a first come first serve basis.

Should you require additional information, please contact your Regional Sales Manager (RM) or Field Service Representative (FSR).

For more information on dedicated schedules, refer to SB 100−00−002.

Bombardier is maintaining a rotable pool of replacement HSTA, to be supplied to the operators under the terms and conditions given below:

NOTES: 1. The removed HSTA must be returned to Bombardier Parts Services in less than 10 days of receipt of replacement unit, with documentation showing the serial number of the aircraft.

2. If the removed HSTA is not returned in less than 10 days, the operator will be charged for the replacement unit.

Send removed HSTA, Part No. C47100−004 or C47100−005 for rework to Bombardier at the address given below:

Learjet Inc. − Core Returns 251−A Wille Road Des Plaines, Illinois 60018−1861 USA or Distribution Centre Frankfurt − Core Returns Bombardier Company GmbH Hans−Boeckler−Strasse 9 GROSS−GERAU Hesse 64521 Germany Refer to your Material Return Authorization (MRA) form to find the applicable return address.

For all parts transactions, Bombardier’s current Spare Parts and Component Repair Price Catalogue General Terms and Conditions apply. These terms and conditions are found on myBombardier at:

my.bombardier.com MODEL BD−100−1A10 (CH−300) Basic Issue: Oct 28/2024 100−27−23 Page 5 of 11

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

H. Tooling The equipment and tools listed below are necessary to this modification.

GSE REFERENCE NO. PART NO. DESCRIPTION 20−00−04 − Inclinometer(See Note 4) 24−00−24 S4933959−501 Circuit Breaker Tag 27C−40−01 G1002740054−001 HSTA go−no go Gauge(See Note 4) 27C−40−05 CA14064−001 HSTA SpannerWrench/Torque Adapter 27C−40−06 CA14065−001 HSTA SpannerWrench/Torque Adapter 27C−41−01 C84215−001 HSTA Rigging Bar 27C−43−02 C47961−001 HSTA Scissor Jack Commercially Available − 5/32 in (4 mm) DiameterPin Punch Commercially Available − Standard 12 oz Ball PeenHammer (or equivalent) 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 BD−100, for acceptable GSE equivalents.

3. This list is provided for a quick reference. In case of discrepancy between this list and the tool called out in the SPM, WM, Chapter 20, then the tool called in the SPM, WM will prevail. Other approved alternative tools are acceptable and can also be used.

4. These tools are only required for testing section.

I. Weight and Balance No change.

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J. Electrical Load Data No change.

K. References − Bombardier, Restriction and/or Special Instruction (RSI), C−100−000−27−0327, Rev. −−.

− MOOG, Service Bulletin C47100−27−07 (attached).

− Bombardier, Standard Practices Manual (SPM), Chapters 20 and 51.

− CH 300 Aircraft Maintenance Manual (AMM), Chapters 6, 24, 27, 52 and 55.

− CH 300 Aircraft Illustrated Parts Catalog (AIPC), Chapter 27.

L. Other Publications Affected None.

M. Equivalent Service Bulletin − For the Challenger 350 aircraft, use Service Bulletin 350−27−014.

2. ACCOMPLISHMENT INSTRUCTIONS NOTES: 1. All TASKs given in the procedures that follow are from the BD−100, Aircraft Maintenance Manual (AMM) unless otherwise specified.

2. All references made to zones, access panels and/or doors, are from the BD−100 Aircraft Maintenance Manual (AMM), Chapter 6.

A. Aircraft Setup

(1) Obey all electrical/electronic safety precautions. Refer to AMM 24−00−00−910−801.

(2) Obey all flight−control safety precautions. Refer to AMM 27−00−00−910−801.

(3) Install the applicable warning placards on the control wheels, control columns, TRIM/STALL control panel, and from the area near the elevator control surfaces and the horizontal stabilizer surface.

(4) Connect electrical power to the aircraft. Refer to AMM 24−00−00−861−801.

(5) On the TRIM/STALL control panel, set the STAB trim switch to PRI.

(6) On the pilots control wheel, do the procedure that follows:

MODEL BD−100−1A10 (CH−300) Basic Issue: Oct 28/2024 100−27−23 Page 7 of 11

PROCEDURE APPLICABLE RESULT Push in the pitch/roll trim switch, set the switch to NOSE UP or NOSE DOWN, and trim the horizontal stabilizer surface to the neutral position.

On the Engine Indication and Crew Alerting System (EICAS) primary page, make sure that the STAB trim position indicator moves to the neutral position and shows 1.9 to 2.1 units.

(7) Remove the electrical power from the aircraft. Refer to AMM 24−00−00−861−802.

(8) Open the aft equipment−compartment door (182GL). Refer to AMM 52−41−00−010−801.

(9) Open and tag the circuit breakers that follow:

CB PANEL CB NO. NAME ZONE LCBP B15 PRI STAB TRIM / RUD LIM 211 RCBP B13 SEC STAB TRIM / RUD LIM 212 LDCPC A4 PRI STAB MOTOR 311 RDCPC A5 SEC STAB MOTOR 312 B. PART A – Check of the HSTA Serial Numbers

(1) Verify the HSTA Serial Numbers in the airplane maintenance tracking records, (or)

(2) Remove the forward access panel (346BR). Refer to AMM 55−30−21−000−802.

(3) Examine the HSTA identification plate and make a record of the part number and HSTA Serial Numbers.

(4) Cross check the HSTA Serial Number against the affected Serial Numbers listed in the Moog SB C47100−27−07 effectivity list referenced in Table 2.

MODEL BD−100−1A10 (CH−300) Basic Issue: Oct 28/2024 100−27−23 Page 8 of 11

TABLE 2 - MOOG SB C47100-27-07 EFFECTIVITY PART NO. NOMENCLATURE SERIAL NUMBERS C47100−004 C47100−005

HORIZONTAL

STABILIZER TRIM

ACTUATOR 012, 014, 019, 044K, 064K, 073, 094, 099, 112, 131, 139, 141, 152, 162, 186, 249, 281, 319, 325K, 328, 350A, 352K, 357, 375, 403, 469, 591.

(See NOTE) NOTE: Serial Numbers indicated in the Table are those known at the time of Service Bulletin release. This Service Bulletin applies whether or not suffix letters ’A’ or ’K’ appears following the Serial Number numerical digits.

(a) If the HSTA Serial Number is listed in Moog SB C47100−27−07 effectivity list, examine the HSTA for modification plate installation as shown in Figure 3−1 of the Moog SB C47100−27−07. If the modification plate is not installed or if SB C47100−27−07 is not shown, do PART B of this Service Bulletin to replace the HSTA and return the defective HSTA for rework.

(b) If the HSTA Serial Number is not listed in Moog SB C47100−27−07 effectivity list or if Moog SB C47100−27−07 is shown on the modification plate, no further action is required. Go to Paragraph 2.E. (Close−out).

C. PART B – Replacement of HSTA NOTE: If it is not possible to complete all the instructions in this Service Bulletin because of the configuration of the aircraft, submit an SRPSA for analysis and to get an approved disposition to complete this Service Bulletin.

Standard SRPSA fees may apply. Refer to the Services section of myBombardier for the latest prices, rates and fees.

(1) Remove the HSTA, Part No. C47100−004 or C47100−005. Refer to AMM 27−41−05−000−801.

(2) Send the removed HSTA, Part No. C47100−004 or C47100−005 for rework to the address shown in Paragraph 1.G.

(3) Install the replacement unit HSTA. Refer to AMM 27−41−05−400−801.

NOTE: The replacement HSTA shall have a modification plate marked with Moog SB C47100−27−07 or a Serial Number out of the range of Moog SB C47100−27−07.

D. Testing

(1) Do the rigging check of the pitch trim system. Refer to AMM 27−41−00−220−801.

(2) Do the operational test of the pitch trim system. Refer to AMM 27−41−00−710−801.

MODEL BD−100−1A10 (CH−300) Basic Issue: Oct 28/2024 100−27−23 Page 9 of 11

E. Close−out

(1) If applicable, install the LH−lower bullet−fairing panel (346CL). Refer to AMM 55−30−21−400−804.

(2) If applicable, install the RH−lower bullet−fairing panel (346CR). Refer to AMM 55−30−21−400−805.

(3) If applicable, install the forward access panel (346BL). Refer to AMM 55−30−21−400−802.

(4) If applicable, install the lower visor fairing (346ALZ/346ARZ). Refer to AMM 55−10−15−400−802.

(5) If applicable, install the upper visor fairing (346BLZ/346BRZ). Refer to AMM 55−10−15−400−801.

(6) Install the forward access panel (346BR). Refer to AMM 55−30−21−400−802.

(7) Remove the tag and close the circuit breakers that follow:

CB PANEL CB NO. NAME ZONE LCBP B15 PRI STAB TRIM / RUD LIM 211 RCBP B13 SEC STAB TRIM / RUD LIM 212 LDCPC A4 PRI STAB MOTOR 311 RDCPC A5 SEC STAB MOTOR 312

(8) Close the aft equipment − compartment door (182GL). Refer to AMM 52−41−00−410−801.

(9) Connect electrical power to the aircraft. Refer to AMM 24−00−00−861−801.

(10) On the TRIM/STALL control panel, set the STAB trim switch to PRI.

(11) Use the pilots control wheel to set the horizontal stabilizer to the neutral position, refer to the procedure that follows:

PROCEDURE APPLICABLE RESULT Push in the pitch/roll trim switch, set the switch to NOSE UP or NOSE DOWN, and trim the horizontal stabilizer surface to the neutral position.

On the engine indication and crew alerting system (EICAS) primary page, make sure that the STAB trim position indicator moves to the neutral position and shows 1.9 to 2.1 units.

(12) Remove the electrical power from the aircraft. Refer to AMM 24−00−00−861−802.

(13) Remove the warning placards from the control wheels, control columns, TRIM/STALL control panel, elevator control surfaces, and the horizontal stabilizer surface.

MODEL BD−100−1A10 (CH−300) Basic Issue: Oct 28/2024 100−27−23 Page 10 of 11

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

F. Recording You can do each PART of this Service Bulletin independently. When any PART of this Service Bulletin is completed, make an entry in the aircraft log and send the attached Incorporation Sheet to Bombardier.

For information, correction(s), comment(s) and/or feedback regarding Service Bulletins released on myBombardier, please contact the Service Bulletin Group at the following email address:

bbad_SBgroup@aero.bombardier.com

3. MATERIAL INFORMATION A. Kits No kits required.

B. Parts The part that follows is necessary to do PART B of this Service Bulletin and is available from Bombardier Parts Services, Montreal:

NEW PART NO. QTY ITEM USED PARTNO. INSTRUCTIONS- DISPOSITION C47100−004 or C47100−005 1 Horizontal StabTrim Actuator C47100−004orC47100−005 Refer toParagraph 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 No materials required.

D. Publications No publications required.

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