### 1. PLANNING INFORMATION A. Effectivity S-76C model helicopters with serial numbers 760506 and 760607 through 760812 including all spare engine control quadrant assemblies. B. Purpose To provide instructions to incorporate a product improvement of the engine control quadrant assembly by installing an improved throttle stop for the ECLs as well as wide trigger assemblies. C. Description The engine control quadrant assembly is partially disassembled and a new throttle stop is installed in place of the existing stop. The existing trigger assembly is removed from each ECL and a new wide trigger assembly is installed. The engine control quadrant assembly is then checked for proper operation and throttle position. After incorporation of the product improvement the helicopter is returned to service. D. Compliance Sikorsky recommends compliance with the ASB and the instructions outlined herein be accomplished on or before March 7, 2012. E. Approval The change affected 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 29. This constitutes EASA approval under the terms of the current interim procedures for working with the European Community. The design data provided in this WARNING: THIS 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INFORMATION WHICH IS PROPRIETARY, IS THE PROPERTY OF SIKORSKY AIRCRAFT CORPORATION AND/OR ITS SUBSIDIARIES, IS AN UNPUBLISHED WORK PROTECTED UNDER APPLICABLE COPYRIGHT LAWS, AND IS DELIVERED ON THE EXPRESS CONDITION THAT IT IS NOT TO BE USED, DISCLOSED, REPRODUCED, IN WHOLE OR IN PART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 OTHER 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. ALL RIGHTS RESERVED. ANY ACT IN VIOLATION OF APPLICABLE LAW MAY RESULT IN CIVIL AND CRIMINAL PENALTIES. EXPORT WARNING: THESE COMMODITIES, TECHNICAL DATA OR SOFTWARE ARE SUBJECT TO THE EXPORT CONTROL OF EITHER THE INTERNATIONAL TRAFFIC IN ARMS REGULATIONS (ITAR) OR THE EXPORT ADMINISTRATION REGULATIONS (EAR) AND CANNOT BE EXPORTED WITHOUT THE AUTHORIZATION OF EITHER THE DEPARTMENT OF STATE OR THE DEPARTMENT OF COMMERCE PRIOR TO EXPORT. EXPORT INCLUDES DISCLOSURE AND OR ACCESS TO COMMODITIES, TECHNICAL DATA OR SOFTWARE BY FOREIGN NATIONALS WHETHER LOCATED IN THE UNITED STATES OR ABROAD. THIS REQUIREMENT APPLIES EQUALLY TO FOREIGN NATIONAL EMPLOYEES OF U.S. COMPANIES AND THEIR FOREIGN SUBSIDIARIES. 

### No. 76-76-6A Subject: ENGINE CONTROLS - Engine Control Quadrant Assembly - One-Time Incorporation of Product

Improvement to Replace Engine Control Lever (ECL) Stop and Trigger Assemblies

April 25/11 Page 1 of 10 76-76-01 Revision A - May 18/11

### document is automatically approved by EASA Decision No. 2004/04/CF, as amended by EASA

Decision No. 2007/001/C. Reference to the EASA Decisions mentioned above shall be made in the release documents issued by the EASA 145 approved organization, releasing the relevant EU registered helicopter or component to service. F. Manpower (Estimated) No. of Men No. of Hours * Man-Hours Incorporation of product improvement to engine control quadrant assembly 1 1.0 1.0

Perform throttle position check/adjustment 1 1.0 1.0 Total 2.0 NOTE: * Estimate does not include time required to prepare helicopter or return to flight status. G. Material None. H. Tooling None. I. Weight and Balance None. J. Electrical Load Data Not Affected. K. Software Load Data Not Applicable. L. References Maintenance Manual, SA 4047-76C-2, Chapter/Section 80-10-00, Engine Start System - Testing and Troubleshooting. M. Publications Affected (1) Illustrated Parts Catalog, SA 4047-76C-4, Chapter/Section 76-00-01, Engine Controls. No. 76-76-6A ENGINE CONTROLS - Engine Control Quadrant Assembly - One-Time Incorporation of Product Improvement to Replace Engine Control Lever (ECL) Stop and Trigger Assemblies 1. PLANNING INFORMATION (Continued)

April 25/11 Page 2 76-76-01 Revision A - May 18/11

### (2) Maintenance Manual, SA 4047-76C-2, Chapter/Section 76-00-00, Engine Controls. (3) S-76C++ Rotorcraft Flight Manual, SA 4047-76C-15, Part 2, Section 1. N. Attachments None. 2. MATERIAL INFORMATION A. Basis for Material Data Per helicopter. B. Bill of Material

New Part No. Qty Key Word Old Part No. Instructions/ Disposition 76070-30034-011 1 Throttle Quadrant Ramp and Triggers M/K (1)

consisting of: MS24693-S47 4 Screw MS24693-S47 MS35206-225 4 Screw MS35206-225 76301-01673-049 1 Trigger Assy 76301-01673-045 76301-01673-050 1 Trigger Assy 76301-01673-046 76301-01675-108 1 Stop 76301-01675-102

(1) For information pertaining to availability and lead time requirements of the product improvement kit listed above, contact your Customer Service Representative at Helicopter Support Inc. (HSI). The cost of the kit is $938.52 until March 7, 2012. Submit an at-cost purchase order and refer to this ASB number and the helicopter serial number(s) upon which this kit will be used. This will permit HSI and the operator to track the shipment and receipt of the kit. Orders will be accepted by letter, telephone, or facsimile (FAX). For prompt shipment, reference the address of each shipping destination. Direct your order to:

HELICOPTER SUPPORT INC. 124 Quarry Road P.O. Box 11068 Trumbull, Connecticut 06611 U.S.A. Attn: Customer Service FAX: (203) 416-4291 Telephone: (203) 416-4000

No. 76-76-6A ENGINE CONTROLS - Engine Control Quadrant Assembly - One-Time Incorporation of Product Improvement to Replace Engine Control Lever (ECL) Stop and Trigger Assemblies 1. PLANNING INFORMATION (Continued)

April 25/11 Page 3 76-76-01 Revision A - May 18/11

### HSI website: www.HSIUS.com

C. Consumable Material None. 3. ACCOMPLISHMENT INSTRUCTIONS A. Incorporate product improvement to engine control quadrant assembly (76301-01670-041) as follows: (1) Prepare helicopter for maintenance. (2) Turn off all helicopter electrical power. (3) Remove four screws (MS35206-225) securing cover plate (76301-01675-105) to engine control quadrant assembly (76301-01670-041). Remove cover plate (Figure 1). (4) Remove four screws (MS24693-S47) securing stop (76301-01675-102) to engine control quadrant assembly (76301-01670-041). Remove stop. (5) Install stop (76301-01675-108) on engine control quadrant assembly (76301-01670-041). Secure with screws (MS24693-S47). (6) Install cover plate (76301-01675-105) on engine control quadrant assembly (76301-01670- 041). Secure with screws (MS35206-225). NOTE: • Position ECLs as necessary to gain access to trigger bolts. • In the following steps, the left-hand ECL is referred to as the No. 1 ECL. The right-hand ECL is referred to as the No. 2 ECL. (7) Incorporate product improvement to No. 1 ECL: (a) Remove trigger bolt (76301-01667-101) securing No. 1 trigger assembly (76301-01673- 045) and trigger spring (76301-01601-109) to handle assembly (76301-01661-043). Remove trigger assembly. NOTE: There are three small holes in the trigger assembly into which the trigger

spring can be inserted. Make sure the trigger spring is inserted into the middle hole. (b) Position trigger spring (76301-01601-109) in middle hole of No. 1 trigger assembly (76301-01673-049), then position No. 1 trigger assembly and trigger spring on handle assembly (76301-01661-043). Secure with trigger bolt (76301-01667-101). Ensure trigger spring is flush with surface. No. 76-76-6A ENGINE CONTROLS - Engine Control Quadrant Assembly - One-Time Incorporation of Product Improvement to Replace Engine Control Lever (ECL) Stop and Trigger Assemblies 2. MATERIAL INFORMATION (Continued)

April 25/11 Page 4 76-76-01 Revision A - May 18/11

### (8) Incorporate product improvement to No. 2 ECL: (a) Remove trigger bolt (76301-01667-101) securing No. 2 trigger assembly (76301-01673- 046) and trigger spring (76301-01601-110) to handle assembly (76301-01661-044). Remove trigger assembly. NOTE: There are three small holes in the trigger assembly into which the trigger

spring can be inserted. Make sure the trigger spring is inserted into the middle hole. (b) Position trigger spring (76301-01601-110) in middle hole of No. 2 trigger assembly (76301-01673-050), then position No. 2 trigger assembly and trigger spring on handle assembly (76301-01661-044). Secure with trigger bolt (76301-01667-101). Ensure trigger spring is flush with surface. (9) Reidentify engine control quadrant assembly as follows: (a) Using an indelible marker with contrasting ink, reidentify No. 1 (LH) engine control quadrant housing assembly (76301-01671-041) to 76301-01671-045. (b) Using an indelible marker with contrasting ink, reidentify No. 2 (RH) engine control quadrant housing assembly (76301-01671-042) to 76301-01671-046. B. Perform throttle position check as follows: (1) Turn on helicopter electrical power. (2) Press MENU softkey on any of the cockpit IIDS displays. (3) Press ENG MAINT softkey twice. THROTTLE POS will be displayed in upper advisory area of display. (4) Set No. 1 ECL to FLY position. THROTTLE POS on IIDS shall read 55.54% 6 2%. (a) If THROTTLE POS on IIDS is within range, proceed to step 5. (b) If THROTTLE POS on IIDS is not within range, proceed to step 7. NOTE: The nominal value listed below is the best achievable setting and should be the approximate value on the IIDS display. Setting the throttle potentiometer at the low end of the tolerance (29.2%) is not desired since the engine shut off condition occurs at 28%. (5) Set No. 1 ECL to IDLE position. This is done by moving No. 1 ECL in front of and against the STOP detent. THROTTLE POS on IIDS shall read 31.24% 6 2%. No. 76-76-6A ENGINE CONTROLS - Engine Control Quadrant Assembly - One-Time Incorporation of Product Improvement to Replace Engine Control Lever (ECL) Stop and Trigger Assemblies 3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

April 25/11 Page 5 76-76-01 Revision A - May 18/11

### (a) If THROTTLE POS on IIDS is within range, proceed to step 6. (b) If THROTTLE POS on IIDS is not within range, proceed to step 7. (6) Set NO. 1 ECL to STOP position. This is done by moving No. 1 ECL behind the STOP detent. THROTTLE POS on IIDS shall read 25% 6 2%. (a) If THROTTLE POS on IIDS is within range, proceed to step 8. (b) If THROTTLE POS on IIDS is not within range, proceed to step 7. (7) If adjustment of the throttle potentiometer is required, the following procedure should be followed: (a) Locate potentiometer inside quadrant and unbend nut retainer on threaded rod. (b) Loosen nut. (c) Turn threaded rod until IIDS display indicates correct throttle position. (d) Tighten nut and secure by bending nut retainer. (e) Repeat steps 4 through 6. (8) Move No. 1 ECL to FLY. FLY/NOT FLY on IIDS should change from 0/1 to 1/0 when ECL engages FLY detent. (a) If FLY/NOT FLY changes as specified, proceed to step 9. (b) If FLY/NOT FLY does not change as specified, refer to Maintenance Manual SA 4047- 76C-2, Chapter/Section 80-10-00. (9) Set No. 2 ECL to FLY position. THROTTLE POS on IIDS shall read 55.54% 6 2%. (a) If THROTTLE POS on IIDS is within range, proceed to step 10. (b) If THROTTLE POS on IIDS is not within range, proceed to step 12. NOTE: The nominal value listed below is the best achievable setting and should be the approximate value on the IIDS display. Setting the throttle potentiometer at the low end of the tolerance (29.2%) is not desired since the engine shut off condition occurs at 28%. (10) Set No. 2 ECL to IDLE position. This is done by moving No. 2 ECL in front of and against the STOP detent. THROTTLE POS on IIDS shall read 31.24% 6 2%. No. 76-76-6A ENGINE CONTROLS - Engine Control Quadrant Assembly - One-Time Incorporation of Product Improvement to Replace Engine Control Lever (ECL) Stop and Trigger Assemblies 3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

April 25/11 Page 6 76-76-01 Revision A - May 18/11

### (a) If THROTTLE POS on IIDS is within range, proceed to step 11. (b) If THROTTLE POS on IIDS is not within range, proceed to step 12. (11) Set NO. 2 ECL to STOP position. This is done by moving No. 2 ECL behind the STOP detent. THROTTLE POS on IIDS shall read 25% 6 2%. (a) If THROTTLE POS on IIDS is within range, proceed to step 13. (b) If THROTTLE POS on IIDS is not within range, proceed to step 12. (12) If adjustment of the throttle potentiometer is required, the following procedure should be followed: (a) Locate potentiometer inside quadrant and unbend nut retainer on threaded rod. (b) Loosen nut. (c) Turn threaded rod until IIDS display indicates correct throttle position. (d) Tighten nut and secure by bending nut retainer. (e) Repeat steps 9 through 11. (13) Move No. 2 ECL to FLY. FLY/NOT FLY on IIDS should change from 0/1 to 1/0 when ECL engages FLY detent. (a) If FLY/NOT FLY changes as specified, proceed to step 14. (b) If FLY/NOT FLY does not change as specified, refer to Maintenance Manual SA 4047- 76C-2, Chapter/Section 80-10-00 Engine Start System - Testing and Troubleshooting. (14) Turn off all helicopter electrical power. (15) Examine work area for security. Make sure work area is clean and free of foreign objects. (16) Return helicopter to service. No. 76-76-6A ENGINE CONTROLS - Engine Control Quadrant Assembly - One-Time Incorporation of Product Improvement to Replace Engine Control Lever (ECL) Stop and Trigger Assemblies 3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

April 25/11 Page 7 76-76-01 Revision A - May 18/11

### C. Record of Compliance Electronically

NOTE: • Record using one of the following compliance methods: • Use section C. as a guide when completing the Record of Compliance Electronically on Sikorsky360 website. • Use section D. when completing the Record of Compliance Manually. Make an appropriate logbook entry to show compliance with this ASB. (1) Log onto www.Sikorsky360.com (2) Click on E-Notifications.
NOTE: Please read the Export Control Statement before agreeing to the terms and

conditions. (3) Agree to the Export Control Statement. (4) Click on E-Notes Compliance. (5) To perform the E-Notification Compliance, select Search by DOCUMENT NUMBER tab and follow the steps 1 through 6 in Figure 2. (6) Once search is complete, select COMPLY next to the helicopter that is in compliance and follow step 7 through 11 in Figure 2. D. Record of Compliance Manually Make an appropriate logbook entry to show compliance with this ASB. Upon compliance with this Alert Service Bulletin, complete attached ALERT SERVICE BULLETIN COMPLIANCE RECORD CARD and return it to Sikorsky Aircraft Corporation. No. 76-76-6A ENGINE CONTROLS - Engine Control Quadrant Assembly - One-Time Incorporation of Product Improvement to Replace Engine Control Lever (ECL) Stop and Trigger Assemblies 3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

April 25/11 Page 8 76-76-01 Revision A - May 18/11SA TD2355_1 VIEW B − B A REMOVE: MS35206−225 SCREW (4) INSTALL: MS35206−225 SCREW − 4 REQ’D REMOVE/INSTALL: 76301−01675−105 B B

REMOVE/INSTALL: 76301−01667−101 TRIGGER BOLT − 2 REQ’D REMOVE: MS24693−S47 SCREW (4) 76301−01675−102 STOP (1) INSTALL: MS24693−S47 SCREW − 4 REQ’D 76301−01675−108 STOP − 1 REQ’D REMOVE/INSTALL: 76301−01601−110 TRIGGER SPRING (RH) − 1 REQ’D 76301−01601−109 TRIGGER SPRING (LH) − 1 REQ’D COVER PLATE − 1 REQ’D A

REMOVE: 76301−01673−045 TRIGGER ASSY (LH) (1) 76301−01673−046 TRIGGER ASSY (RH) (1) INSTALL: 76301−01673−049 TRIGGER ASSY (LH) − 1 REQ’D 76301−01673−050 TRIGGER ASSY (RH) − 1 REQ’D



### ENGINE CONTROL QUADRANT ASSEMBLY, REPLACE ECL THROTTLE STOP AND TRIGGER ASSEMBLIES FIGURE 1 No. 76-76-6A

April 25/11 Page 9 76-76-01 Revision A - May 18/11TD2503 

## USE AS A GUIDE, INFORMA TION WILL V

ARY

E-No tification s - Comp liance S ubmi ssion Type Doc ument N umber Subj ect

Owne r/O per ato r Submi tted By Submi ssio n Da te Aut hor ize d By Comp liance Date Comp liance Status

Seri al Number

Submit Cancel ASB/S B 76-76-6 ENGI NE CONTR OLS - Eng ine c ont rol Quandr ant Ass emb ly, One Ti me Prod uct Impro vem ent

ANY He lic opters ANY Use r Feb 13, 2011

*

Select the air crafttha t t his com plia nce will ap ply to. HINT : H old t he CTRL bu tt on t o se lect mu lti ple item s.

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760641 760642 760643 760644 760645 *

11 SELEC T S UBMIT SELEC T D OC STATUS9 ENTER COM PLIAN CE DAT E 8 ENT ER NAME HERE 7

SELECT SER IAL N UMBE R 1 0 User Guide Add New Aircraft E-Notes Search E-Notifications Compliance

Sear ch by DOCUM ENT NUM BER

S-76A S-76B S-76C S-92A E-Notificati on T

ype* SEL ECTALL - C LEAR ALL Mode l *

Load Li st ASB/SB 7 6-21- 1 ASB/SB 7 6-21-4A ASB/SB 7 6-21-5A ASB/SB 7 6-32- 6 ASB/SB 7 6-21-7A ASB/SB 7 6-22-1A ASB/SB 7 6-22- 2 ASB/SB 7 6-22-6A ASB/SB 7 8-23- 1 ASB/SB 7 6-23-2A ASB/SB 7 6-24- 1 Docu men t N umb er * Comp liance Status* SEL ECTALL - C LEAR ALL Compli ed Not Applica ble Open Wai ting Part s

Search * Req uir ed To sea rch e-not ification comp liance by d ocument num ber:
Select E-Noti fica tion Typ e(s ) an d Mode l(s) an d c lic k th e “ Load List ” b utton, t hen Select Documen t Nlumber(s ) an d Comp lianc e S tatus(e s) an d c lic k th e “ Sea rch” but ton

. HINT : Ho ld the CT RL but ton to select mul tip le item s. Clear ASB/SB - Ale rt Service Bulletin / Service Bulletin CSN - Custome r Se rvi ce Notice Sea rch by AIR CRAFT

SELECTLOAD L IST3 SELEC T D OC NUMBER 4

SELECTOP EN 5 2 SELECT M ODEL 1 SE LECT DOC TYPE

6 SE LECT SEARCH

STEPS 1 THROU GH 6

STEPS 7 THROU GH 11



### GUIDE FOR E-NOTIFICATION COMPLIANCE

FIGURE 2. No. 76-76-6A

April 25/11 Page 10 76-76-01 Revision A - May 18/11

# (860) 998-7565

Upon COMPLIANCE with the attached ASB , Sikorsky requests your cooperation in completing and returning this ENTIRE P AGE by MAIL , FAX , or scan & EMAI L

. ATTENTION: SAS PRODUCT SAFETY MANAGER S IKORSKY AEROSPACE SERVICES 

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