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# SERVICE BULLETIN Customer Support ATA SYSTEM: 2421 NUMBER: 84 ---24 ---45 

### BOMBARDIER AEROSPACE REGIONAL AIRCRAFT CONSIDER THIS SERVICE BULLETIN TO BE PARTICULARLY SIGNIFICANT AND URGES OPERATORS TO PROMPTLY EVALUATE THE CONTENTS

SUBJECT: Electrical Power --- Modification of AC Generators --- Special Inspection/Rectification --- ModSum 4 ---113691

1. PLANNING INFORMA TION A. Effectivity Aircraft Affected: In ---Service: DHC ---8 Aircraft Models 401 and 402 Serial Numbers 4001 thru 4338 with AC Generators P/N 1152218 ---4 & 1152218 ---5. Production: ModSum 4 ---113691 will be installed before delivery on applicable DHC ---8 Aircraft at Serial Number 4339 and subsequent. NOTE: The instructions in this service bulletin are only applicable to the systems and parts installed at the time of delivery on the aircraft or as changed by Bombardier Aerospace Service Bulletin(s). Before you do this bulletin, examine all STC or equivalent action changes to make sure this bulletin can be completed.

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S.B. 84 ---24 ---45 Page 2 of 22 13 Jan 2011 JR Spares Affected: The following is a list of spares affected by this change. Review spares and procurement systems to determine the existence of any listed parts.
Part Number Description 1152218 ---5 AC Generator 1152218 ---4 AC Generator 1152218 ---3 AC Generator (see Note below) NOTE: AC Generators P/N P/N 1152218 ---3 are not subject to the instructions of this service bulletin. However, upon the return of P/N 1152218 ---3 for overhaul or repair, it will be upgraded to P/N 1152218 ---6. Upon installation of AC Generator P/N 1152218 ---6, it is not permissible to replace P/N 1152218 ---6 with AC Generator P/N’s 1152218 ---5, 1152218 ---4 or 1152218 ---3.
B. Reason Problem: Honeywell has determined that the Rotor Band in some AC Generators may fail due to an incomplete fusion in the weld joint. This defect is visually undetectable and the Rotor Band must be x --- rayed by Honeywell to ensure conformance. X ---Rayed Rotor Bands will be serialized. Solution: Re ---identification of the AC Generator will be performed to provide verification that the Rotor Bands used in the assembly of the Generator have been certified to have acceptable welds and the Lower Crossover improvement has been incorporated. C. Description The procedures in this service bulletin give the instructions to do the tasks that follow:

NOTE: Do not remove the AC Generators from service until contacted by Honeywell. --- Once returned to Honeywell, the AC Generators will be disassembled and the Rotor Bands removed from the Rotor Assembly and x --- rayed. Rotor Bands which fail the x --- ray inspection will be replaced, and the Rotor Assemblies will be rebuilt using Rotor Bands which have passed the x --- ray inspection --- Once rebuilt, the AC Generators will be tested and recertified. The Modification Plate will be marked to indicate incorporation of this Service Bulletin

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S.B. 84 ---24 ---45 Page 3 of 22 13 Jan 2011 JR --- an operational test of the AC Variable Frequency Generation system is done --- close out. D. Compliance Bombardier Inc. recommends incorporation of this service bulletin at the earliest opportunity unless otherwise directed by the operator’s airworthiness authority. E. Approval The technical content of this service bulletin has been approved under the authority of the Transport Canada Civil Aviation (TCCA) Design Approval Organization No: DAO #93 ---Q ---02. This Service Bulletin does not affect Airworthiness Limitations (AWLs) or Damage Tolerance Inspections (DTIs). F. Manpower It will take an estimated 1.45 man ---hours to remove the generator from the aircraft. Refer to enclosed Honeywell Service Bulletin 1152218 ---24 ---118 for hours required to modify generator. The breakdown of the man ---hours is shown in the table that follows: TASK MAN ---HOURS Job Set ---Up 0.15 Procedure 1.00 Test / RTS 0.15 Close ---Out 0.15 For any on---site labor assistance, please speak with a Fleet Services representative for a quote. The Fleet Services group can be contacted via the Q Series Technical Help Desk by telephone at 416---375---4000 or email at : thd.qseries@aero.bombardier.com G. Material --- Price and Availability Refer to enclosed Honeywell Service Bulletin 1152218 ---24 ---118. H. Tooling --- Price and Availability None

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S.B. 84 ---24 ---45 Page 4 of 22 13 Jan 2011 JR I. Weight and Balance None J. Electrical Load Data Not affected K. Publications Affected Dash 8 Illustrated Parts Catalogue PSM 1 ---84 ---4

.................... L. References The initial issue of this service bulletin was prepared to the engineering drawings and related data that follows: ModSum 4Q113691 Rev. B ModSum 4 ---113691 Rev. C PCA 43250 Revision 0 (for internal reference only) Honeywell Service Bulletin 1152218 ---24 ---118 Revision 1 dated 20 Nov 2010 2. MATERIAL INFORMA TION A. Parts Required Per Aircraft Refer to enclosed Honeywell Service Bulletin 1152218 ---24 ---118. B. Parts Required to Modify Spares Refer to enclosed Honeywell Service Bulletin 1152218 ---24 ---118. C. Special Tools and Equipment Required None D. Existing Parts Accountability None

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S.B. 84 ---24 ---45 Page 5 of 22 13 Jan 2011 JR 3. ACCOMPLISHMENTINSTRUCTIONS A. Job Set ---Up (1) Placard and select all aircraft electrical power to OFF. Obey all relevant WARNINGS and CAUTIONS (refer to PSM ... Chapters 12 and 24). (2) Make sure that lock pins are installed thru each main gear and main gear door mechanism. (3) Make sure the nose gear ground lock is engaged. (4) Set up the work platforms or ladders as required to gain access to the AC Generators. Make sure the work platforms or ladders are electrically grounded. B. Procedure (1) Do not remove functional AC Generators from service until contacted by Honeywell. (2) Once contacted by Honeywell inspect aircraft and spares for AC Generators P/N 1152218 ---4 & 1152218 ---5 Series 1 and specific 1152218 ---5 Series 2 serial numbers listed in Table 1 of enclosed Honeywell Service Bulletin 1152218 ---24 ---118. (3) Remove AC Generators P/N 1152218 ---4 & 1152218 ---5 Series 1 and specific 1152218 ---5 Series 2 serial numbers listed in Table 1 of enclosed Honeywell Service Bulletin 1152218 ---24 ---118 from aircraft or spares depot. Refer to Maintenance Manual Task 24 ---21 ---01 ---000 ---801. (4) Return AC generator to Honeywell. Refer to enclosed Honeywell Service Bulletin 1152218 ---24 ---118 for instructions. (5) Once repaired AC generator have been returned to operator, install generator per Maintenance Manual Task 24 ---21 ---01 ---400 ---801. NOTE: Upon installation of AC Generator P/N 1152218 ---6, it is not permissible to replace P/N 1152218 ---6 with AC Generator P/N’s 1152218 ---5, 1152218 ---4 or 1152218 ---3. C. Close Out (1) Remove all tools and equipment from the work area. (2) On completion of this service bulletin, make the following entry in the appropriate logbooks: “Service Bulletin 84 ---24 ---45 {Electrical Power --- Modification of AC Generators --- Special Inspection/Rectification} accomplished.”

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### This Page Intentionally Blank 1Jan 2009 SERVICE BULLETIN (SB) --- RECORD OF INCORPORATION --- Q SERIES DASH 8 AIRCRAFT To: Partner Data Co ---Ordinator (Toronto), Bombardier Aerospace Commercial Aircraft Phone: (1) 416 375 3534 Facsimile: (1) 416 375 4538 E --mail: cmdb.requests@aero.bombardier.com From: Company: Phone: Extn: Facsimile: Date:

E --mail: The data that you provide below will help us record the incorporation of this ModSum and the aircraft effectivity in the maintenance manual. Operator: Service Bulletin:

__________________Revision:

_________ Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: 

## Fax this sheet to (1) 416 375 4538 or Email PDF to: 

# cmdb.requests@aero.bombardier.comFeb 2009 SERVICE BULLETIN (SB) --- COMMENT SHEET --- Q SERIES DASH 8 AIRCRAFT

To: SB Focal (Toronto), Bombardier Aerospace Commercial Aircraft Phone: (1) 416 375 4078 Facsimile: (1) 416 375 4538 E --mail: syed.rizvi@aero.bombardier.com From: Company: Phone: Extn: Facsimile: Date:

E --mail: Select appropriate box(es) and add comments or suggestions you would like us to know that may enhance the quality of our service bulletins. Service Bulletin: Revision: ModSum: 1. PLANNING INFORMATION V Effectivity V Reason V Description V Compliance VApproval V Manpower V Material VWeight and Balance V Electrical Load VTooling V References V Publications Affected 2. MATERIAL INFORMATION V Kit Content VSpecial Tools/Equipment V Parts to Modify Spares V Consumables V Disposition of Existing Parts V Other 3. ACCOMPLISHMENT INSTRUCTIONS VJob Set ---Up V Procedure V Close---Out VTest V Illustration(s) V Other 4. COMMENTS, REMARKS, SUGGESTIONS



## Fax this sheet to (1) 416 375 4538 or Email PDF to: syed.rizvi@aero.bombardier.com