Page 1 of 9 ATA 26-21-04 ONE-TIME MODIFICATION 

# S-92 ALERT SERVICE BULLETIN

N OTICE TO A LL P ERSONS R ECEIVING T HIS D OCUMENT : W ARNING : T HIS DOCUMENT , OR AN EMBODIMENT OF IT IN ANY MEDIA , DISCLOSES INFORMATION WHICH IS PROPRIETARY , IS THE PROPERTY OF SIKORSKY AIRCRAFT CORPORATION AND / OR ITS SUBSIDIARIES , IS AN UNPUBLISHED WORK PROTECTED UNDER APPLICABLE COPYRIGHT LAWS , AND IS DELIVERED ON THE EXPRESS CONDITION THAT IT IS NOT TO BE USED , DISCLOSED , REPRODUCED , IN WHOLE OR IN PART ( INCLUDING REPRODUCTION AS A DERIVATIVE WORK ), OR USED FOR MANUFACTURE FOR ANYONE OTHE R THAN SIKORSKY AIRCRAFT CORPORATION AND / OR ITS SUBSIDIARIES WITHOUT ITS WRITTEN CONSENT , AND THAT NO RIGHT IS GRANTED TO DISCLOSE OR SO USE ANY INFORMATION CONTAINED HEREIN

. A LL RIGHTS RESERVED

. A NY ACT IN VIOLATION OF APPLICABLE LAW MAY RESULT IN CIVIL AND CRIMINAL PENALTIES

. E XPORT W ARNING : T HESE COMMODITIES , TECHNICAL DATA OR SOFTWARE ARE SUBJECT TO THE EXPORT CONTROL OF EITHER THE I NTERNATIONAL T RAFFIC IN A RMS R EGULATIONS (ITAR) OR THE E XPORT A DMINISTRATION R EGULATIONS (EAR) AND CANNOT BE EXPORTED WITHOUT THE PRIOR AUTHORIZATION OF EITHER THE D EPARTMENT OF S TATE OR THE D EPARTMENT OF C OMMERCE

. T HE TERM “E XPORT ” INCLUDES ANY DISCLOSURE AND / OR PROVISION OF ACCESS TO COMMODITIES , TECHNICAL DATA OR SOFTWARE TO OR BY FOREIGN NATIONALS ( WHETHER LOCATED IN THE U NITED S TATES OR A BROAD ). T HIS REQUIREMENT ALSO APPLIES TO FOREIGN NATIONAL EMPLOYEES OF U.S. C OMPANIES AND THEIR FOREIGN SUBSIDIARIES

. ASB 92-26-004 Basic Issue ▪ June 04/12 SUBJECT: FIRE PROTECTION – Engine and APU Fire Extinguishing Lines – Modification of No. 1 Engine Forward Firewall Center Discharge Tube

Section 1. PLANNING INFORMATION A. Effectivity S-92A model helicopters with serial nu mbers 920006 through 920169. B. Purpose To modify No. 1 engine forward fire wall center discharge tube to correct length and position and to inspect outboard discha rge tube for correct orientation. C. Description Center discharge tube is remov ed, modified and installed in correct orientation. Outboard discharge tube is visually inspected for correct orientation and repositioned if required. D. Compliance Compliance is essential. The in structions outlined herein shall be accomplished within 120 days from the issue date of this Alert Service Bulletin (ASB). E. Approval The design change effected by this document is classified as Major, and is FAA approved in accordance with the applicable requirements of United States Federal Aviation Regulations 14 CFR Part 29. FAA approval constitutes EASA and Transport Canada appr oval under the terms of current BAA/BASA Implementation Procedures. Sikorsky Aircraft Corporation 6900 Main Street P.O. Box 9729 Stratford, Connecticut 06615-9129 (203) 386-4000

### S-92 ALERT ASB 92-26-004 

### SERVICE BULLETIN Basic Issue ▪ June 04/12

Page 2 ATA 26-21-04 ONE-TIME MODIFICATION Section 1. PLANNING lNFORMATION (Continued) F. Manpower (Estimated)
Task No. of Men No. of Hours Man-Hours * Modify No. 1 engine forward firewall center discharge tube 1 2.0 2.0 Inspect outboard discharge tube 1 1.0 1.0 Total Man-Hours 3.0 *Estimate does not include time required to prepa re helicopter or return it to flight status.
G. Material None. H. Tooling (1) Tubing cutter (commercial grade or equivalent). (2) Straight edge ruler (commercial grade or equivalent). (3) Digital caliper (commercial grade or equivalent). (4) Torque wrench 150-750 inch-lbs (commercial grade or equivalent). (5) Shorting jumper (commercial grade or equivalent). I. Weight and Balance Not affected. J. Electrical Load Data Not affected. K. Software Load Data Not changed. L. References (1) Maintenance Manual SA S92A-AMM-0 00, Chapter/Section 53-70-00-900-001. (2) Temporary Revision No. 26-03 against Maintenance Manual SA S92A-AMM-000, Chapter/Section 26-21-04-960-004, Removal/In stallation of Engine Fire Extinguishing Lines - Engine Inlet, is issued concurrently with this ASB.ASB 92-26-004 

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Page 3 ATA 26-21-04 ONE-TIME MODIFICATION Section 1. PLANNING lNFORMATION (Continued) M. Publications Affected Maintenance Manual SA S92A-AMM-000 , Chapter/Section 26-21-04-960-004. N. Attachment None. Section 2. MATERIAL INFORMATION A. Basis for Material Data Per helicopter. B. Bill of Material None. C. Consumable Material

Qty Nomenclature Part No. Source As Req’d Anti-Seize Compound Never-Seez, NPBT-8, or equivalent (1) As Req’d Protective Caps and Plugs NAS847 or equivalent (2) As Req’d Permanent Marker Commercial grade or equivalent (3) (1) Available from Bostik, Inc. Website: www.bostik-us.com

. (2) Available from CSG Parts. Website: http://www.csgparts.com/ (3) Procure through local supply. Section 3. ACCOMPLISHMENT INSTRUCTIONS A. Prepare helicopter for modification: (1) Turn off all helicopter electrical and hydraulic power. OBSERVE ALL CAUTIONS AND WARNINGS ON CONTAINERS WHEN USING CONSUMABLES. WHEN APPLICABLE, WEAR NECESSARY PROTECTIVE GEAR DURING HANDLING AND USE. IF A CONSUMABLE IS FLAMMABLE OR EXPLOSIVE, MAKE CERTAIN CONSUMABLE AND ITS VAPORS ARE KEPT AWAY FROM HEAT, SPARK AND FLAME. MAKE CERTAIN FIREFIGHTING EQUIPMENT IS READILY AVAILABLE PRIOR TO USE. FOR ADDITIONAL INFORMATION ON TOXICITY, FLASHPOINT AND FLAMMABILITY OF CHEMICALS, CONSULT YOUR MEDICAL PEOPLE OR THE MANUFACTURER OF THE CONSUMABLE.

### S-92 ALERT ASB 92-26-004 

### SERVICE BULLETIN Basic Issue ▪ June 04/12

Page 4 ATA 26-21-04 ONE-TIME MODIFICATION Section 3. ACCOMPLISHMENT INSTRUCTIONS (Continued) (2) Engage rotor brake. (3) Open No. 1 engine cowling/work platform to access fire extinguishing lines. Refer to Maintenance Manual SA S92A-AMM-000 , Chapter/Section 53-70-00-900-001. B. Modify No. 1 engine forward firewall center discharge tube: (1) Loosen B-nut on center discharge tube and re move tube from tee fitting. Install protective cap or plug on tee fitting. NOTE: Final length of center discharge tube shall be 4.0 inches long. (2) Using tubing cutter, cut 2.0 inches off disc harge end of center discharge tube (Figure 1). (3) Deburr both OD and ID of cut end of ce nter discharge tube. Blow tube clear with compressed air. (4) Using permanent marker (commercial grade or equivalent), reidentify center discharge tube (92310-04050-057) to 92310-04050-058. (5) Remove protective cap or plug from tee fitting. (6) Coat male threads with anti-seize compound (Never-Seez, NPBT-8, or equivalent).(7) Loosely install center discharge tube on tee fitting. Position tube as shown and torque Bnut to 285 inch-lbs. (Figure 2). C. Visually inspect outboard discharge t ube for correct orientation as follows: (1) Verify orientation is to dimension shown (Figure 3) (a) If orientation is not correct proceed to section D. (b) If orientation is correct proceed to section E. D. Orient outboard discharge tube as follows: (1) Loosen clamp securing outboard discharge tube to firewall. (2) Loosen B-nut on outboard discharge tube. (3) Position outboard discharge tube to dimension shown and torque B-nut to 285 inch-lbs (Figure 3). (4) Tighten clamp securing outboard discharge tube to firewall.ASB 92-26-004 

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Page 5 ATA 26-21-04 ONE-TIME MODIFICATION Section 3. ACCOMPLISHMENT INSTRUCTIONS (Continued) E. Completion procedures:(1) Close No. 1 engine cowling/work platform. Refer to Maintenance Manual SA S92A-AMM000, Chapter/Section 53-70-00-900-001. (2) Return helicopter to service. F. Record of compliance: (1) Make helicopter logbook entries to sh ow compliance with this ASB as follows: (a) Make helicopter level logbook entry on form SA7343-15. (b) When ASB modifies a component that can be removed from this helicopter: 1. Make component log card entries on forms SA7343-22 & SA7343-21 as applicable. 2. If a component modified by this ASB does not have a log card and the ASB does not create one, then annotate co mpliance on the next higher assembly that the component belongs to which does have a log card. NOTE: If access to www.Sikorsky360.com is unavailable, complete attached ALERT SERVICE BULLETIN COMPLIANCE RECORD CARD and return it to Sikorsky Aircraft Corporation. (2) Make an appropriate electronic compliance entry in the E-Notification section at www.Sikorsky360.com . Refer to User Guide located on the www.Sikorsky360.com/ENotification Search page.

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### SERVICE BULLETIN Basic Issue ▪ June 04/12

Page 6 ATA 26-21-04 ONE-TIME MODIFICATION Section 3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

CENTER DISCHARGE TUBE MODIFICATION FIGURE 1 S A **TD2737_ 1**  **2.0 INCH**

**C ENTER**  **D ISCHARGE TUBE** ASB 92-26-004 

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Page 7 ATA 26-21-04 ONE-TIME MODIFICATION Section 3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

CENTER DISCHARGE TUBE ORIENTATION FIGURE 2 (SHEET 1 OF 2) SA **TD2737_2 4.9 INCH**  **F ORWARD**  **F IREWALL**  **CENTER DISCHARGE TUBE** 

**5.1 INCH**

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### SERVICE BULLETIN Basic Issue ▪ June 04/12

Page 8 ATA 26-21-04 ONE-TIME MODIFICATION Section 3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

CENTER DISCHARGE TUBE ORIENTATION FIGURE 2 (SHEET 2) **TD2737_3** SA **CENTER DISCHARGE TUBE** 

**APPROXIMATELY 0.3 INCH**  **CLEARANCE APPROXIMATELY**  **0.3 INCH CLEARANCE**  **CENTER DISCHARGE TUBE** 

**1.7 INCH 1.4 INCH**  **SEE NOTE ENGINE OIL**  **FILTER**

**ENGINE OIL FILTER** 

**ENGINE OIL PRESSURE TUBE** 

**MEASUREMENT IS BETWEEN CENTER OF NUT ON ENGINE OIL FILTER AND CENTER**  **OF CENTER DISCHARGE TUBE. NOTE:** ASB 92-26-004 

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Page 9 ATA 26-21-04 ONE-TIME MODIFICATION Section 3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

OUTBOARD DISCHARGE TUBE ORIENTATION FIGURE 3 2.0 INCH 1.8 INCH

FORWARD FIREWALL

SA TD2737_4 OUTBOARD DISCHARGE TUBE

### (Fold over and tape closed)

SIKORSKY AIRCRAFT CORPORATION 

# FACSIMILE NUMBER (860) 998-7565
EMAIL ADDRESS: GPSIKSASProductSafet@utc.com

ATTENTION: SAS PRODUCT SAFETY MANAGER SIKORSKY AEROSPACE SERVICES

(Fold Up to Arrows) 

# IMPORTANT NOTICE
Upon COMPLIANCE with the attached ASB, Sikors ky requests your cooperation in completing and returning this ENTIRE PAGE by MAIL, FAX, or scan & EMAIL. If you have internet access, you may go to www.sikorsky.com to record your compliance. 

### Please fill in the requested information at the bottom of the page, so we may maintain proper records documenting the configuration of your aircraft. This information is useful when determining configuration and effectiv ity of issues affecting fielded aircraft. This request is in keeping with our policy to assure that our customers receive the latest information applicable for the maintenance of your aircraft. Thank you. ALERT SERVICE BULLETIN:

________________ Compliance Record Card TITLE: ___________________________________________________________________

___________________________________________________________________

___________________________________________________________________ OWNER/OPERATOR: _____________________________________________________ SUBMITTED BY: ___________________________ DATE: ____________________ FOLLOWING SERIAL NUMBERS ARE NOT AFFECTED BY THIS ASB ASB HAS BEEN COMPLIED WITH ON THE FOLLOWING SERIAL NUMBERS

___________ ___________ ___________ ___________ ___________ ___________

___________ ___________ ___________ ___________ ___________ ___________ ASB No. 92-26-004 FIRE PROTECTION – Engine and APU Fire Extinguishing Lines – Modification of No. 1 Engine Forward Firewa ll Center Discharge TubeNo Postage Necessary


### BUSINESS REPLY MAIL FIRST-CLASS MAIL PERMIT NO. 432 BRIDGEPORT CT POSTAGE WILL BE PAID BY ADDRESSEE 

### SIKORSKY AIRCRAFT CORPORATION P.O. BOX 9729 6900 MAIN STREET STRATFORD, CONNECTICUT 06615-9129 U.S.A. MAILSTOP: S328A ATTENTION: SAS PRODUCT SAFETY MANAGER SIKORSKY AEROSPACE SERVICES



## Please complete the form on the reverse side and FAX to 

# FACSIMILE NUMBER (860) 998-7565 Or scan and email to: EMAIL ADDRESS: GPSIKSASProductSafet@utc.com or fold and return ENTIRE form to Sikorsky Airc raft Corporation