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AIRCRAFT CORPORATION AND/OR ITS SUBSIDIARIES, IS AN UNPUBLISHED WORK PROTECTED UNDER APPLICABLE COPYRIGHT LAWS, AND IS DELIVERED ON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 18/11
SA

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 18/11
TD2503

USE AS A GUIDE, INFORMATION WILL VARY

E-Notifications - Compliance Submission

Type

Document Number

Subject

Owner/Operator

Submitted By

Submission Date

Authorized By

Compliance Date

Compliance Status

Serial Number

Submit Cancel

ASB/SB

76-76-6

ENGINE CONTROLS - Engine control Quandrant Assembly, One Time 

Product Improvement

ANY Helicopters

ANY User

Feb 13, 2011

*

Select the aircraft that this compliance will apply to.

HINT: Hold the CTRL button to select multiple items.

Select *

 *

760641

760642

760643

760644

760645 *

11 SELECT SUBMIT

SELECT DOC STATUS 9

ENTER COMPLIANCE DATE 8

ENTER NAME HERE 7

SELECT SERIAL NUMBER 10

User Guide Add New Aircraft E-Notifications E-Notes Search

Compliance

Search by DOCUMENT NUMBER

S-76A

S-76B

S-76C

S-92A

E-Notification Type*

SELECT ALL - CLEAR ALL

Model*

Load List

ASB/SB 76-21-1

ASB/SB 76-21-4A

ASB/SB 76-21-5A

ASB/SB 76-32-6

ASB/SB 76-21-7A

ASB/SB 76-22-1A

ASB/SB 76-22-2

ASB/SB 76-22-6A

ASB/SB 78-23-1

ASB/SB 76-23-2A

ASB/SB 76-24-1

Document Number* Compliance Status*

SELECT ALL - CLEAR ALL

Complied

Not Applicable

Open

Waiting Parts

Search

* Required

To search e-notification compliance by document number:

Select E-Notification Type(s) and Model(s) and click the “Load List” button, then

Select Document Nlumber(s) and Compliance Status(es) and click the “Search”

button.

HINT: Hold the CTRL button to select multiple items.

Clear

ASB/SB - Alert Service Bulletin / Service Bulletin

CSN - Customer Service Notice

Search by AIRCRAFT

SELECT LOAD LIST 3

SELECT DOC NUMBER 4

SELECT OPEN 5

2 SELECT MODEL

1 SELECT DOC TYPE

6 SELECT SEARCH 

STEPS 1 THROUGH 6

STEPS 7 THROUGH 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 PAGE by MAIL, FAX, or scan & EMAIL.

ATTENTION: SAS PRODUCT SAFETY MANAGER

 SIKORSKY AEROSPACE SERVICES

EMAIL ADDRESS: GPSIKSASProductSafet@utc.com

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
BUSINESS REPLY MAIL

MAILSTOP: S328A

SAS PRODUCT SAFETY MANAGER

SIKORSKY AEROSPACE SERVICES

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