# 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 limitat ions 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, 2010Gulfstream 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 Ai rplane 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:

NoneGulfstream 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 custom er 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 NECESSA RY 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 th is 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 NECESSA RY 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 1Gulfstream 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 pub lication. No part may be reproduced, stored in any retrieval syst em, or transmitted in any part or form or by any means, electronic, photocopying, micr ofilm, microfiche, mechanical, or otherwise, without prior written permission of Gu lfstream Aerospace.

This technical data is controlled under the Ex port Administration Regulations by General License TSU. It may not be transferre d 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 pub lication. No part may be reproduced, stored in any retrieval syst em, or transmitted in any part or form or by any means, electronic, photocopying, micr ofilm, microfiche, mechanical, or otherwise, without prior written permission of Gu lfstream Aerospace.

This technical data is controlled under the Ex port Administration Regulations by General License TSU. It may not be transferre d 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: