Basic Issue: Apr 25/2011 604-24-023

Page 1 of 1 

SERVICE BULLETIN SUMMARY 

This Service Bulletin is available at: 

www.cic.bombardier.com

CL-600-2B16

ATA 24-23 

ELECTRICAL POWER 

MODIFICATION – EMERGENCY AC GENERATION SYSTEM – REPLACE THE 

AIR DRIVEN GENERATOR (ADG) GENERATOR CONTROL UNIT (GCU) 

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 

Recommended within 36 months from the 

release date of this Service Bulletin 

(Basic Issue). 

EFFECTIVITY: A/C Serial No. 5408 to 5665 

MANPOWER: 1 man-hour is necessary to do this modification 

TLMC, CH 5, PART 4 REQUIREMENT 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: Consideration should be given to do this modification and SB 604-24-024 at the 

next Scheduled Maintenance of the Air Driven Generator system. (Operational Test 

of the ADG, as per TLMC, Ch. 5, TASK 24-23-00-101* (1600 Hour or 24 Month, 

Task interval, whichever interval occurs first)) 

To place an order for parts or kits, please call Bombardier Parts Logistics 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. 

© 2011 Bombardier Inc. All rights reserved 

Challenger*, Global Express*, Global Express XRS*, Global 5000*, Learjet* are Trademarks of Bombardier Inc. 

Basic Issue: Apr 25/2011 604-24-023

Page 1 of 8 

SERVICE BULLETIN 

This Service Bulletin is available at: 

www.cic.bombardier.com

MODEL CL-600-2B16

ATA 24-23 

ELECTRICAL POWER 

MODIFICATION – EMERGENCY AC GENERATION SYSTEM – REPLACE THE 

AIR DRIVEN GENERATOR (ADG) GENERATOR CONTROL UNIT (GCU) 

1. PLANNING INFORMATION 

NOTE: Consideration should be given to do this modification and SB 604-24-024 

at the next Scheduled Maintenance of the Air Driven Generator system. 

(Operational Test of the ADG, as per TLMC, Ch. 5, TASK 24-23-00-101* 

(1600 Hour or 24 Month, Task interval, whichever interval occurs first)) .

A. Effectivity 

CL-600-2B16 aircraft, Serial No. 5408 to 5665. 

NOTE: 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. 

B. Reason 

This Service Bulletin gives instructions to replace the existing ADG GCU, 

Part No. 761341A with GCU, Part No. 761341B. The new GCU comes with an 

improved A1T1 transformer thermal cycling and a lower threshold undervoltage 

detection circuit that prevents nuisance faults and provides improved reliability. 
MODEL CL-600-2B16

Basic Issue: Apr 25/2011 604-24-023

Page 2 of 8 

C. Description 

This Service Bulletin gives instructions to: 

– Get access to the Air Driven Generator (ADG), Generator Control Unit (GCU), 

– Remove the old ADG GCU, Part No. 761341A (604-90800-7), 

– Install the new ADG GCU, Part No. 761341B (604-90800-27), and 

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

D. Compliance 

Recommended, within 36 months, from the release date of this Service Bulletin 

(Basic Issue). 

NOTE: Consideration should be given to do this modification and SB 604-24-024 

at the next Scheduled Maintenance of the Air Driven Generator system. 

(Operational Test of the ADG, as per TLMC, Ch. 5, TASK24-23-00-101* 

(1600 Hour or 24 Month, Task interval, whichever interval occurs first)) .

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 604-00-002. 

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. 

1 man-hour is necessary to replace the GCU. 

The labor required to replace the GCU is at no cost if: 

(i) the work is done at Bombardier Business Aviation Services (BBAS) 

or Authorized Service Facilities (ASF), and 

(ii) this Service Bulletin is scheduled in less than 36 months from its 

release date (Basic Issue). 
MODEL CL-600-2B16

Basic Issue: Apr 25/2011 604-24-023

Page 3 of 8 

If required, Bombardier Aerospace will pay 1 man-hour for the ADG in-flight 

deployment test including the post flight ADG stowage. Bombardier Aerospace 

will also pay for the direct operating cost as per the industry’s standard, (ref.: 

Conklin & de Decker - Aircraft Cost Evaluator 2011, Volume I) of the flight test 

required for the return to service of the ADG GCU replacement, if: 

(i) the work is done during new aircraft warranty period, and 

(ii) the work is done at Bombardier Business Aviation Services (BBAS) 

or Authorized Service Facilities (ASF). 

G. Material – Cost and Availability 

The GCU in Paragraph 3.B. is necessary to do this modification. 

This Service Bulletin is covered by a dedicated schedule. To ensure a timely 

and effective return/upgrade program, advance scheduling is required through 

our In-Service Implementation Team (ISIT). Please contact your Regional 

Manager (RM), Field Service Representative (FSR) or Customer Service 

Representative (CSR) as soon as is practical to schedule your aircraft. 

Send units for modification to Bombardier Aerospace at the address given below: 

Learjet Core Returns 

8219 West Irving, Bldg 9, Dock 9, 

Wichita, KS 67209 

USA 

NOTE: Bombardier Aerospace, Parts Logistics Montreal will maintain a rotable 

pool of upgraded GCU units to support this program. When required, 

exchange GCU units will be supplied to the operators under the terms 

and conditions given below: 

– The removed GCU, Part No. 761341A (604-90800-7), must be 

returned to Bombardier Aerospace, Parts Logistics in less than 

10 days of receipt of the replacement unit, with documentation 

showing the serial number of the aircraft. 

– If the removed GCU is not returned in less than 10 days, the 

operator will be charged for the replacement unit. 

The GCU, Part No. 761341B (604-90800-27), listed in Paragraph 3.B. is 

available at no cost for aircraft in and out of warranty if: 

(i) a no-charge purchase order is sent to Bombardier Aerospace in less 

than 36 months from this Service Bulletin release date (Basic Issue), 

During or after the above free period, Smart Parts Plus does not pay for the parts. 
MODEL CL-600-2B16

Basic Issue: Apr 25/2011 604-24-023

Page 4 of 8 

H. Tooling 

GSE REFERENCE NO. PART NO. DESCRIPTION 

GSE 10-10-30 - Protector, ADG Blade 

GSE 24-00-24 - Tag, Circuit Breaker 

NOTES: 1. Refer to the CL-604 Illustrated Tool and Equipment Manual to make 

sure that you use the correct equipment configuration. 

2. Refer to the Introduction of the publication listed in NOTE 1 for 

acceptable GSE equivalents. 

I. Weight and Balance 

No change. 

J. Electrical Load Data 

No change. 

K. References 

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

C-4063, Rev. B. 

– Bombardier Aerospace, Modification Summary, 600-6078, Rev. B2. 

– Bombardier Aerospace, SB 604-24-024 “Modification – Air-Driven Generator 

(ADG) System – Replacement of ADG Power Feeder Cable”. 

– Hamilton Sundstrand, Service Bulletin ERPS10G-24-1. 

– CL-604 Aircraft Maintenance Manual (AMM), Chapters 6 and 24. 

– CL-604 Standard Practice Manual (SPM), Chapters 20 and 51. 

– CL-604 Operating Manual, PSP 604-6, Volume 1, Chapter 9. 

L. Other Publications Affected 

– None. 

M. Equivalent Service Bulletin 

For the CL-605 Challenger Aircraft, use SB 605-24-003. 

2. ACCOMPLISHMENT INSTRUCTIONS 

NOTES: 1. All TASKs given in the procedures that follow are from the CL-604 

Aircraft Maintenance Manual unless otherwise specified. 

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

the CL-604 Aircraft Maintenance Manual, Chapter 6. 

A. Aircraft Setup 

(1) Obey all electrical/electronic safety precautions. Refer to 

TASK 24-00-00-910-801. 
MODEL CL-600-2B16

Basic Issue: Apr 25/2011 604-24-023

Page 5 of 8 

(2) Open the access door that follows: 

ACCESS DESIGNATION 

311BB Door, Aft Equipment Compartment 

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

CB PANEL CB NO. NAME ZONE 

CBP-1 C10 ADG DEPLOY SENSE 221 

CBP-2 C10 ADG DEPLOY SENSE 222 

CBP-2 N6 ADG DEPLOY CONT AUTO 222 

CBP-2 N7 ADG DEPLOY CONT MAN 222 

CBP-5 B10 ADG AUTO 311 

CBP-5 B11 ADG MAN 311 

(4) On aircraft, Serial No. 5774, 5595 to 5665, open and tag the circuit breakers 

that follow: 

CB PANEL CB NO. NAME ZONE 

CBP-2 C11 ADG HEATER 222 

(5) Do a manual extension of the dry ADG. Refer to TASK 24-23-01-840-805. 

(6) Install the protective covers on the ADG turbine blades. 

B. Modification 

(1) Remove the old ADG GCU, Part No. 761341A (604-90800-7). Refer to 

TASK 24-23-10-000-801.

(2) Install the new ADG GCU, Part No. 761341B (604-90800-27). Refer to the 

step that follows and TASK 24-23-10-400-801. 

(a) Torque the screws from 23 to 27 lbf in (2.60 to 3.05 Nm). Refer to 

SPM TASK 20-21-00-910-801. 

(b) Do the electrical bonding test for the GCU. Refer to SPM 

TASK 51-80-00-760-801. 

NOTE: With the connectors P2XC and P5XC disconnected, make sure 

that the resistance value is not more than 0.010 ohm, between 

one of the connector receptacles J2 or J5 and the aircraft 

structure.

(3) Connect the connectors P2XC and P5XC then do a retraction of the dry ADG 

after manual extension procedure. Refer to TASK 24-23-01-840-806. 
MODEL CL-600-2B16

Basic Issue: Apr 25/2011 604-24-023

Page 6 of 8 

C. Close-out /Testing 

(1) Close the circuit breakers that follow: 

CB PANEL CB NO. NAME ZONE 

CBP-1 C10 ADG DEPLOY SENSE 221 

CBP-2 C10 ADG DEPLOY SENSE 222 

CBP-2 N6 ADG DEPLOY CONT AUTO 222 

CBP-2 N7 ADG DEPLOY CONT MAN 222 

CBP-5 B10 ADG AUTO 311 

CBP-5 B11 ADG MAN 311 

(2) On aircraft, Serial No. 5774, 5595 to 5665, close the circuit breakers that follow: 

CB PANEL CB NO. NAME ZONE 

CBP-2 C11 ADG HEATER 222 

(3) Remove all tools, equipment, and unwanted materials from the work area. 

(4) Close the access door that follows: 

ACCESS DESIGNATION 

311BB Door, Aft Equipment Compartment 

(5) Do an ADG operational test (Operating Manual (Vol. 1) INíFLIGHT CHECKS, 

AiríDriven Generator Checks). 

D. 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). 
MODEL CL-600-2B16

Basic Issue: Apr 25/2011 604-24-023

Page 7 of 8 

3. MATERIAL INFORMATION 

A. Kit 

No kits required. 

B. Parts 

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

Bombardier Aerospace Parts Logistics, Montreal: 

NEW 

PART NO. 

QTY ITEM USED 

PART NO. 

INSTRUCTIONS - 

DISPOSITION 

761341B 

(604-90800-27) 

1 GCU 761341A 

(604-90800-7) 

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 material that follows, or equivalent, is necessary to do this Service Bulletin. 

It can be purchased from a local supplier. Bombardier Aerospace does not pay 

for this consumable. 

DESCRIPTION PART 

No./NAME 

SPECIFICATION QUANTITY SUPPLIER

(See Note)

Coating 

Chemical 

Conversion 

Alodine 1000 MIL-PRF-81706 As 

Necessary Code: A 

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. 
MODEL CL-600-2B16

Basic Issue: Apr 25/2011 604-24-023

Page 8 of 8 

SUPPLIERS ADDRESSES BY CODES 

Code: A 

Henkel Surface Technologies 

32100 Stephenson Highway 

Madison Heights, MI 48071 

Tel: 1-248-583-9300 

www.henkel.com

D. Publications 

No publications required.
THANK YOU FOR YOUR RESPONSE! 

PLEASE RETURN THIS COMPLETED EVALUATION FORM BY MAIL, E-MAIL OR FAX

SERVICE BULLETIN EVALUATION FORM 

(Your ideas will help us provide better bulletins) 

SERVICE BULLETIN: 604-24-023 ISSUE: Basic DATED: Apr 25/2011 

TITLE: Modification – Emergency AC Generation System – Replace the Air Driven Generator 

(ADG) Generator Control Unit (GCU) 

STRONGLY 

DISAGREE 

DISAGREE AGREE STRONGLY 

AGREE 

N/A 

x Instructions to do the Service Bulletin 

were accurate. 

Comments:

    

x Illustration(s), figure(s), and/or kit drawing(s) 

were helpful to carry out instructions. 

Comments:

    

x If a kit and/or parts were required, did the 

contents of the kit and/or parts received agree 

with the contents listed in the bulletin? 

Comments:

    

x The consumable materials listed under 

Paragraph 3 were easily procured. 

 Comments:

    

x Work was accomplished in the prescribed time.

Comments

    

x Overall, I was satisfied with this Service Bulletin. 

 Comments:

    

For 

administrative 

use only 

PLEASE SUPPLY US WITH THE FOLLOWING DATA AND FAX TO: (514) 855-7634 

or 

E-MAIL TO: MTL_BBAD_SB_Evaluation@aero.bombardier.com

OPERATOR:

051PM AIRCRAFT SERIAL NO.:

TELEPHONE:

FACSIMILE:

NAME: (Please print) 
-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 

Bombardier Business Aircraft Customer Services (BBACS) 

P.O. Box 6087, Station Centre-ville 

Montréal, Québec, Canada H3C 3G9 

Attention: Customer Support Department 

-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 
SERVICE BULLETIN INCORPORATION SHEET – “604-24-023” 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 

604-24-023 Basic - 

- - - 

- - - 

Actual hours to accomplish Service Bulletin: 

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. 

* NOTES: 

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 

Signature not required if sent by E-Mail (dd/mm/yy) 
-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 

Bombardier Business Aircraft Customer Services (BBACS) 

P.O. Box 6087, Station Centre-ville 

Montréal, Québec, Canada H3C 3G9 

Attention: Customer Support Department, Maintenance Engineering 

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