Gulfstream

TRANSMITTAL SHEET 

December 20, 2010 Transmittal 

 Page 1

This sheet transmits Revision A, dated December 20, 2010, to Gulfstream G550 Alert Customer 

Bulletin (ACB) 10, dated December 6, 2010, titled Fire Protection (ATA 26), Inspection – Third 

Engine Fire Bottle Installation. 

Reason for Revision

Planning Information – 

Description Statement Updated: Part II includes the addition of an Airplane Flight Manual 

Supplement (AFMS) CE51 628M001. This AFMS must be incorporated into the Airplane Flight 

Manual (AFM) if the operator chooses to retain the mounted spare in service. 

Compliance Statement Updated: Operators who have previously complied with the original 

version of ACB 10 may report this revision as “Previously complied with”. Additionally, operators 

with mounted spare engine fire bottle installations have the option to retain the mounted spares in 

service by incorporating the attached AFMS. 

References updated: Added AFMS number CE51 628M001. 

Accomplishment Instructions – 

Step III.B. is updated: Clarifies options for operators with mounted engine fire bottle spares to 

either remove the spare bottle with no APU limitations or retain the mounted spare in service by 

incorporating the AFMS. 

This is a REVISION of Gulfstream G550 Alert Customer Bulletin 10. This alert customer bulletin 

revision cancels and supersedes ACB 10. Aircraft operators who have previously complied with 

ACB 10 are in compliance with this revision and should return the service reply cards marked 

“Previously complied with.” 

Note: Operators who have previously complied with Part II of ACB 10 by removing their mounted 

engine fire bottle spares may reinstall them by incorporating the attached AFMS and 

reporting compliance with Part II of this alert customer bulletin revision. 

List of Effective Pages

Page No. Date

1-3 December 20, 2010 

Previous revisions to Alert Customer Bulletin 10: 

None
CUSTOMER BULLETIN

SUBJECT

ALERT 

NUMBER 10A 

FIRE PROTECTION (ATA 26) 

INSPECTION – THIRD ENGINE FIRE BOTTLE 

INSTALLATION 

DECEMBER 20, 2010 
Gulfstream G550 Alert Customer Bulletin No. 10A 

“December 20, 2010” 

Page 1 of 4 

Fire Protection (ATA 26), Inspection – Third Engine Fire Bottle Installation 

I. Planning Information:

A. Effectivity: 

Aircraft serial numbers 5001 through 5308 

B. Reason: 

Some G550 aircraft have been outfitted with a third engine fire extinguisher bottle 

installed as a mounted engine fire bottle spare. Gulfstream has determined that current 

installation of the third fire extinguisher bottle is located within the APU rotor burst 

fragment zone. This configuration does not meet the requirements of the Code of 

Federal Regulations (CFR) 14, 25.901, 903 and Advisory Circular (AC) 20-128A. 

C. Description: 

This alert customer bulletin is divided into two parts: 

Part I is a one-time action to inspect for, and report, the installation of a third engine fire 

extinguisher bottle. 

Part II, if applicable, is a one-time action to incorporate Airplane Flight Manual 

Supplement (AFMS) CE51 628M001 into the Airplane Flight Manual (AFM) to provide 

limitations for APU operation. Operators have the option to remove the mounted spare 

fire bottle and avoid the incorporation of APU limitations. 

D. Compliance: 

Compliance with this alert customer bulletin revision is required with 21 days of the 

release date of the original alert customer bulletin dated December 6, 2010. 

Operators who have previously complied with ACB 10 may report this alert customer 

bulletin as “Previously complied with”. Operators who have previously removed their 

mounted spare engine fire bottles have the option to reinstall them by complying with 

Part II of this alert customer bulletin and incorporating the AFMS as directed. 

E. Approval: 

This modification is classified as Minor, and is approved by the Federal Aviation 

Administration (FAA). 

F. Manpower: 

Part I - 0.5 man-hour 

Part II (if applicable) - 1.0 man-hour 

G. Material: 

None 
Gulfstream G550 Alert Customer Bulletin No. 10A 

“December 20, 2010” 

Page 2 of 4 

H. References: 

 G550 Aircraft Maintenance Manual (AMM), Chapters 20 and 26 

 Airplane Flight Manual Supplement (AFMS) CE51 628M001 (attached) 

I. Tooling/Equipment: 

Standard aircraft maintenance tools 

J. Opportunity for No Charge Compliance.

The labor to comply with this alert customer bulletin will be provided at no charge if 

performed at a Gulfstream G550 Authorized Warranty Repair Facility within the 

compliance time stated in this document. 

Note: Additional labor hours incurred due to aircraft configuration or mechanical 

difficulties must be charged on a separate work order and submitted for warranty 

consideration. 

K. Weight and Balance: 

For G550 aircraft where fire bottle removal is accomplished, the following weight and 

balance change must be recorded: 

Bottle weight – 11.1 lbs 

Arm – 852.2” 

Moment - 9459 

Part I

II. Accomplishment Instructions:

CAUTION: PROTECT WIRE BUNDLES, CONNECTORS AND SURROUNDING 

STRUCTURE DURING ANY MAINTENANCE PROCEDURE FROM SHAVINGS, 

DEBRIS AND CONTAMINATION. MAINTAIN A PROPERLY CLEANED WORK 

AREA THROUGHOUT THE PROCEDURE TO ENSURE THE INTEGRITY OF 

THE AFFECTED COMPONENT / SYSTEM. VISUALLY INSPECT WORK AREA 

USING ADDITIONAL LIGHT AS NECESSARY TO VERIFY ABSENCE OF ANY 

DEBRIS PRIOR TO COMPLETION OF PROCEDURE. FAILURE TO COMPLY 

MAY RESULT IN DAMAGE TO COMPONENTS AND / OR SYSTEMS.

A. Prepare the aircraft for safe maintenance. Refer to AMM, Safe Ground Maintenance 

Procedure, Chapter 20.

B. Inspect aircraft to determine if a third engine fire bottle has been installed. This may be 

done by visual inspection (see Figure 1) or by aircraft records review. 

C. If a third bottle is not installed, report Part I of this alert customer bulletin as “Not 

applicable, Appliance not installed”. Report Part II of this alert customer bulletin as “Not 

applicable”. 
Gulfstream G550 Alert Customer Bulletin No. 10A 

“December 20, 2010” 

Page 3 of 4 

D. If a third bottle is installed, report Part I of this alert customer bulletin as “Complied with”. 

Comply with Part II of this alert customer bulletin. 

E. Ensure work area is clean and clear of foreign objects (FOD). 

F. Record compliance with Part I of this alert customer bulletin in the aircraft’s permanent 

maintenance records and return aircraft to flight status. 

G. Report compliance with Part I of this alert customer bulletin to Gulfstream Computerized 

Maintenance Program (CMP) via electronic transmittal or fill out and fax the attached 

service reply card. 

Part II

III. Accomplishment Instructions:

CAUTION: PROTECT WIRE BUNDLES, CONNECTORS AND SURROUNDING 

STRUCTURE DURING ANY MAINTENANCE PROCEDURE FROM SHAVINGS, 

DEBRIS AND CONTAMINATION. MAINTAIN A PROPERLY CLEANED WORK 

AREA THROUGHOUT THE PROCEDURE TO ENSURE THE INTEGRITY OF 

THE AFFECTED COMPONENT / SYSTEM. VISUALLY INSPECT WORK AREA 

USING ADDITIONAL LIGHT AS NECESSARY TO VERIFY ABSENCE OF ANY 

DEBRIS PRIOR TO COMPLETION OF PROCEDURE. FAILURE TO COMPLY 

MAY RESULT IN DAMAGE TO COMPONENTS AND / OR SYSTEMS.

A. Prepare the aircraft for safe maintenance. Refer to AMM, Safe Ground Maintenance 

Procedure, Chapter 20. 

B. Comply with one of the following two options: 

1. For operators choosing to retain the mounted engine fire bottle spare; incorporate 

AFMS CE51 628M001 into the AFM. 

2. Operators have the option to remove the spare bottle from the mounted location and 

store as required by local regulations, thereby not incurring any APU operational 

limitations. With removal of the spare mounted engine fire bottle, AFMS incorporation 

is not required. 

C. Record compliance with Part II of this alert customer bulletin in the aircraft’s permanent 

maintenance records and return aircraft to flight status. 

D. Report compliance with Part II of this alert customer bulletin to Gulfstream CMP via 

electronic transmittal or fill out and fax the attached service reply card. 

If technical assistance is required, contact your area Gulfstream Field Service Representative or call 

Gulfstream Customer Support at 800-810-GULF (4853) or 912-965-4178 (fax 912-965-4184). 
Gulfstream G550 Alert Customer Bulletin No. 10A 

“December 20, 2010” 

Page 4 of 4 

Third Engine Fire Bottle, Spare Mount Configuration (view looking outboard, left side) 

Figure 1 
Gulfstream G550 Alert Customer Bulletin No. 10A 

“December 20, 2010” 

Customer Bulletin prepared by Gulfstream Aerospace, 500 Gulfstream Road, P.O. Box 2206, Savannah, Georgia 31402-2206, USA. 

© 2010 Gulfstream Aerospace 

All rights reserved, including the right to reproduce this publication. No part may be reproduced, stored in any retrieval system, or transmitted in any part or form or 

by any means, electronic, photocopying, microfilm, microfiche, mechanical, or otherwise, without prior written permission of Gulfstream Aerospace. 

This technical data is controlled under the Export Administration Regulations by General License TSU. It may not be transferred to a third party 

without the prior written approval of the U.S. Department of Commerce.

GA 611A 2/97 

Part I 

Service Reply Card 

Please fax this page to Gulfstream CMP at 800-944-1775 or 912-963-0265. 

The following Alert Customer Bulletin (ACB) has been addressed: 

CB Number A/C A/C Type Compliance Date 

990102 G550 

Aircraft Hours 

Aircraft Landings 

This Alert Customer Bulletin is not applicable because: 

Serial Number not affected 

Appliance not installed 

______Previously complied with 

 

Signature Title/Certificate Number Company 

Comments / Suggestions: 
Gulfstream G550 Alert Customer Bulletin No. 10A 

“December 20, 2010” 

Customer Bulletin prepared by Gulfstream Aerospace, 500 Gulfstream Road, P.O. Box 2206, Savannah, Georgia 31402-2206, USA. 

© 2010 Gulfstream Aerospace 

All rights reserved, including the right to reproduce this publication. No part may be reproduced, stored in any retrieval system, or transmitted in any part or form or 

by any means, electronic, photocopying, microfilm, microfiche, mechanical, or otherwise, without prior written permission of Gulfstream Aerospace. 

This technical data is controlled under the Export Administration Regulations by General License TSU. It may not be transferred to a third party 

without the prior written approval of the U.S. Department of Commerce.

GA 611A 2/97 

Part II 

Service Reply Card 

Please fax this page to Gulfstream CMP at 800-944-1775 or 912-963-0265. 

The following Alert Customer Bulletin (ACB) has been addressed: 

CB Number A/C A/C Type Compliance Date 

990103 G550 

Aircraft Hours 

Aircraft Landings 

Action Taken: 

Incorporated AFMS 

Removed Spare 

This Alert Customer Bulletin is not applicable because: 

Serial Number not affected 

Appliance not installed 

______Previously complied with 

 

Signature Title/Certificate Number Company 

Comments / Suggestions: