### July 08, 2009 TRANSMITTAL SHEET Subject: ALERT SERVICE BULLETIN NO. 76-66-48B, POWERTRAIN - Main Gear Box - Electric Rotor Brake (ERB) - One-Time Modification of This page transmits Revision B to Alert Service Bulletin No. 76-66-48 dated September 11, 2007. Alert Service Bulletin No. 76-66-48B supersedes Alert Service Bulletin No. 76-66-48A. The text changed by this revision is indicated by a vertical line in the outer margin of the page. Illustration changes are indicated by a vertical line adjacent to the subject title. REVISION INSTRUCTIONS: Operators that have previously complied with the original released Alert Service Bulletin No. 76- 66-48 dated September 11, 2007or Revision A dated March 09, 2009 are not affected by Revision B. Operators that have not complied with original released Alert Service Bulletin No. 76-66-48 dated September 11, 2007or Revision A dated March 09, 2009 must comply with Revision B in its entirety. Revision Feature: Reason for revision: In paragraph 1., PLANNING INFORMATION - Compliance - Section D., Changed compliance time to December 31, 2009. Also, added statement, Operators should be aware that MMEL restrictions may limit the time that the helicopter is permitted to operate with the disabled rotor brake. SIKORSKY AIRCRAFT Technical Directives Section

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### 1. PLANNING INFORMATION A. Effectivity All S-76A model helicopters with an Electric Rotor Brake (ERB) configuration. B. Purpose To provide instructions for the installation of a one-time ERB modification kit. Background: The electric rotor brake system utilized on some S-76A helicopters incorporates a warning light and automated hydraulic fluid 9 dump 9 function to prevent inadvertent system over pressurization. System analysis has revealed single point failure modes that can simultaneously disable both the visible cockpit warning light as well as the automated pressure relieving 9 dump 9 feature. A system modification has been developed that will eliminate all single point failure modes, provide redundant electrical power sourcing, and add a health monitoring function that advises the crew of maintenance action requirements. C. Description Prepare helicopterformaintenance. Open engine airinlet cowls. Remove cabin ceiling panels. Remove RH relay panel. RH relay panel is modified. Reinstall RH relay panel. Install PSI-SW-Assembly on engine compartment bulkhead. Access DC Junction Box and modify wiring. Create new wire harnesses and interconnect PSI-SW Assembly, DC Junction Box, RH relay panel, with new relay box assembly. Reinstall cabin ceiling panels. Perform continuity test. Perform ground operation test. Close engine air inlet cowls. Perform operational function test. Return helicopter to service. THIS ALERT SERVICE BULLETIN IS THE PROPERTY OF SIKORSKY AIRCRAFT CORPORATION AND IS PROTECTED UNDER THE COPYRIGHT LAWS OF THE UNITED STATES AND OTHER COUNTRIES. THIS ALERT SERVICE BULLETIN IS DISTRIBUTED ONLY TO OWNERS/OPERATORS OF COMMERCIALLY-CERTIFIED SIKORSKY S76 HELICOPTERS AND SIKORSKY-AUTHORIZED LOGISTIC AND SERVICE CENTERS FOR THE PURPOSE OF FOSTERING THE SAFE AND EFFICIENT OPERATION OF SUCH HELICOPTERS AND UNDER THE EXPRESS CONDITION THAT THE CONTENTS OF THIS ALERT SERVICE BULLETIN ARE NOT TO BE DISCLOSED, REPRODUCED, OR DISTRIBUTED, IN WHOLE OR IN PART, TO ANY THIRD PARTY, OR ADAPTED AS A DERIVATIVE WORK, WITHOUT THE EXPRESS DOCUMENTED CONSENT OF SIKORSKY AIRCRAFT CORPORATION. ANY ACT IN VIOLATION OF APPLICABLE LAW MAY RESULT IN CIVIL AND/OR CRIMINAL PENALTIES. LIMITED DISTRIBUTION R SIKORSKY AIRCRAFT CORPORATION 1999 ALL RIGHTS RESERVED 

### No. 76-66-48B Subject: POWERTRAIN - Main GearBox - Electric RotorBrake (ERB) - One-Time Modification of

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### D. Compliance Compliance is essential. The one-time modification outlined herein is to be accomplished no laterthan December31, 2009. If operator chooses not to comply with this ASB, the rotor brake must be disabled per SA 4047-76-2, Section 66-50-00. Operators should be aware that MMEL restrictions may limit the time that the helicopter is permitted to operate with the disabled rotor brake. E. Approval This ASB has been reviewed by the appropriate government authority and the modifications herein comply with the applicable Aviation Regulations and are APPROVED for installation in the S-76 model helicopter. F. Manpower(Estimated) No. of Men No. of Hours Man-Hours Install Modification Kit 2 16 32.0 NOTE: Estimate does not include time required to prepare helicopter or return it to flight status. G. Weight and Balance Change in basic weight: +3.5 lbs. Change in basic horizontal moment/1000: 179.3-inch. Change in basic longitudinal moment/1000: +0.6-inch-lbs/1000. H. Electrical Load Data Not Changed. I. Software Load Data Not Changed. J. References Applicable Maintenance Manual Rotorcraft Flight Manual Supplement No. 41, Sikorsky Model S-76A, Part 1, Electric Rotor Brake System (Modified). Alert Service Bulletin No. 76-66-36. CustomerService Notice (CSN) No. 76-66-7 No. 76-66-48B POWERTRAIN - Main GearBox - Electric RotorBrake (ERB) - One-Time Modification of 1. PLANNING INFORMATION (Continued)

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### CSN No. 76-66-10. CSN 76-113. K. Publications Affected Applicable Maintenance Manual, SA4047-76AA-2, Chapter66-50-00. Illustrated Parts Catalog. L. Tooling Required None. 2 MATERIAL INFORMATION A. Basis forMaterial Data None. B. Bill of Material New Part No. Qty Nomenclature Old Part No. Instructions/ Disposition 76070-55207-011 1 Modification Kit (1) consisting of: MS21044N3 1 Nut MS27039-1-09 1 Screw MS35338-43 1 Washer, Lock NAS1149D0363J 1 Washer, Flat NAS1149F0316P 1 Washer, Flat 76070-55207-043 1 Harness Assy (1) made-up of: DAMA-15S 1 Connector DA20961 1 Junction Shell D20419-21 2 Screw, Lock Assy MS25274-2 2 Cap MS27488-20 4 Plug, Seal MS3476W10-6P 1 Connector, Plug No. 76-66-48B POWERTRAIN - Main GearBox - Electric RotorBrake (ERB) - One-Time Modification of 1. PLANNING INFORMATION (Continued)

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### New Part No. Qty Nomenclature Old Part No. Instructions/ Disposition M39029/4-110 6 Contact M39029/5-115 2 Contact, Socket M7928/1-22 1 Terminal M7928/1-24 4 Terminal M81824/1-1 5 Splice M81824/1-2 1 Splice M85049/52-1- 10W 1 Strain Relief SS7048-4 2 Suppressor SS7094-S2-175 -9 2ft Sleeve Marker SS7614-20-9 200ft Wire SS7614-24H-9 50ft Wire 76070-55207-045 1 DC Junction Box (1) M7928/1-22 1 Terminal M7928/1-23 1 Terminal SS7094-S2-175 -9 1ft Sleeve Marker SS7614-20-9 10ft Wire SS7072P0250S005 5 Sleeve, Insul 76070-55207-046 1 RH Relay Panel (1) consisting of: MS27488-20 2 Plug, Seal M39029/22-192 3 Contact, Soc M39029/4-110 2 Contact M81824/1-2 2 Splice SS7094-S2-175 -9 1ft Sleeve Marker SS7614-22-9 10ft Wire SS7072P0250S005 5 Sleeve, Insul 76070-55207-047 1 RH Relay Panel (1) consisting of: MS27488-20 2 Plug, Seal M39029/4-110 2 Contact No. 76-66-48B POWERTRAIN - Main GearBox - Electric RotorBrake (ERB) - One-Time Modification of 2. MATERIAL INFORMATION (Continued)

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### New Part No. Qty Nomenclature Old Part No. Instructions/ Disposition SS7072P0250S005 5 Sleeve, Insul SS7094-S2-175 -9 1ft Sleeve Marker SS7614-22-9 25ft Wire 76070-55207-012 1 Manifold Instl, (1) consisting of: AN6289J4 1 Nut AN6289J4 AS117-04-0190 1 Hose Assy MS21044N3 2 Nut MS21912J4 1 Tee AP2802J04 MS21919WCJ6 1 Clamp MS27039-1-24 1 Screw MS28773-04 1 RetainerMS28773-04 MS28778-4 1 Packing MS28778-4 M7885/4-5-03 4 Rivet NAS1149C0332R 2 Washer, Flat NAS43DD3-64 1 Spacer R23100-5 3ft Spiral Wrap 76070-55207-073 1 PSI-SW Assy (1) made-up of: AN4-13A 2 Bolt AN6289J4 1 Nut FSS1-10 1 Nut Ring MS21926J4 1 Elbow MS28773-04 1 Retainer MS28778-4 1 Packing MS28778-4 MS35206-215 4 Screw NAS620-4L 4 Washer NAS620-416L 2 Washer SS9014J1RB 1 Ident Plate 22114 1 Manifold 76070-55207-013 1 RotorBrake Mod (1) consisting of: MS21044N08 4 Nut No. 76-66-48B POWERTRAIN - Main GearBox - Electric RotorBrake (ERB) - One-Time Modification of 2. MATERIAL INFORMATION (Continued)

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### New Part No. Qty Nomenclature Old Part No. Instructions/ Disposition MS21044N3 1 Nut MS27039-0807 4 Screw MS27039-1-09 1 Screw MS35338-43 1 Washer, Lock NAS1149DN816J 4 Washer, Flat NAS1149D0363J 1 Washer, Flat NAS1149F0316P 1 Washer, Flat SS9014P2RB 1 Ident Plate 76070-55207-041 1 Relay Box Assy76070-55207-105 1 Identification MILM-43719 76070-55207-044 1 Harness Assembly (1) Made-up of: MS25274-2 2 Cap MS27488-20 2 Plug, Seal MS3470W10-6S 1 Connector, Rcpt M39029/5-115 6 Contact, Socket SS7094-S2-175- 9 1 Sleeve Marker 76070-55207-072 1 Bracket SW Assy (1) For parts availability, and lead time requirements, contact your Customer Service Representative at Helicopter Support, Inc (HSI). Submit a purchase order referencing the Alert Service Bulletin number and aircraft serial numbers upon which these parts will be used. This will allow HSI and the operator to track shipment and receipt of parts. Orders will be accepted by letter, telephone, or facsimile (FAX). For prompt shipment, reference address of each shipping destination. Direct your order to: HELICOPTER SUPPORT INC., 124 Quarry Road Trumbull, CT 06611-4816 Attn: CustomerService FAX: (203) 416-4291 Telephone: (203) 416-4000 No. 76-66-48B POWERTRAIN - Main GearBox - Electric RotorBrake (ERB) - One-Time Modification of 2. MATERIAL INFORMATION (Continued)

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### HSI website: www.HSIUS.com C. Consumable Material 

## WARNING 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. QTY NOMENCLATURE MATERIAL NO. AS REQ’D CHEMICAL CONVERSION COATING (1) ALODINE 600, MIL-C-5541 OR EQUIVALENT AS REQ’D EPOXY PRIMER (2) MIL-P-23377, OR EQUIVALENT AS REQ’D ISOPROPYL ALCOHOL (3) TT-I-735 OR EQUIVALENT AS REQ’D CONTACT ADHESIVE EC1357 OR EQUIVALENT AS REQ’D LOW-LINT CLEANING CLOTH MIL-C-85043 OR EQUIVALENT AS REQ’D HYDRAULIC FLUID MIL-H-5606 OR MIL-PRF-83282 OR EQUIVALENT (1) Manufactured by Amchem Products Inc. Spring Garden Street, Ambler, PA, 19002 (2) Manufactured by Products Research and Chemical Corporation, 5454 San Fernando Road, Glendale, CA 91209 (3) Manufactured by Chemical Commodities Agency Inc., 27447 Pacific St., Highland, CA 92346- 2640 3. ACCOMPLISHMENT INSTRUCTIONS A. Install ERB Modification Kit (76070-55207-011) as follows: NOTE: ASB 76-66-36, latest revision (prior to helicopter serial number 760250) and Customer Service Notice (CSN) 76-113, latest revision must be complied with prior to, or concurrently with this ASB. (1) Prepare helicopter for maintenance. No. 76-66-48B POWERTRAIN - Main GearBox - Electric RotorBrake (ERB) - One-Time Modification of 2. MATERIAL INFORMATION (Continued)

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### (2) Remove all electrical power and disconnect battery. (3) Open engine airinlet cowls perapplicable maintenance manual. (4) Remove access panels and ducting as necessary to get to RBD mounted on main gear box rearcoverperapplicable maintenance manual. (5) Disconnect electrical connector from rotor brake accumulator/reservoir on main gear box upperhousing perapplicable maintenance manual. B. Install Manifold Installation Modification Kit 76070-55207-012 (part of Modification Kit Rotor Brake Installation, 76070-55207-011) as follows: (1) Locate STA 215, LBL 21.62 and WL 118.00 forsuitable mounting surface on bulkhead for installation of (manifold pressure switch) PSI-SW Assy (76070-55207-073) (Figures 1 and 2). (2) Remove existing elbow (AP2802J04), nut (AN6289J4), packing (MS28778-4), and retainer (MS28773-04) from base of rotor brake power unit (76650-09803) per applicable maintenance manual. Discard removed details. NOTE: In order to install hose assembly (AS117-04-0190), existing transmission electrical harness bracket (adjacent to upper oil hose elbow) may need to be moved or trimmed. Each installation may be different. (3) Purge lines, fittings etc. before starting installation. (4) Coat all threads with hydraulic fluid (MIL-H-5606, MIL-PRF-83282, or equivalent). (5) Install tee (MS21912J4), nut (AN6289J4), packing (MS28778-4) and retainer (MS28773-04) to base of rotor brake power unit (76650-09803). Do not tighten. (6) Blow all lines clearat installation. NOTE: Make sure no preloading is felt when installing oil hose assembly (AS117-04- 0190). (7) Install upperend of hose assembly (AS117-04-0190) to base of rotorbrake powerunit (76650-09803). Do not tighten (Figures 1 and 2). (8) Install lowerend of hose assembly (AS117-04-0190) to attached elbow (MS21926J4) on PSI-SW Assy (76070-55207-073). Do not tighten. NOTE: Hose assembly (AS117-04-0190) length influences location of PSI-SW Assy (76070-55207-073) on frame. No. 76-66-48B POWERTRAIN - Main GearBox - Electric RotorBrake (ERB) - One-Time Modification of 3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

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### (9) Trial fit PSI-SW Assy (76070-55207-073) to frame (trim or modify as required to assist installation). (10) Remove four existing in-line vertical rivets in frame to secure PSI-SW Assy (76070-55207- 073). NOTE: Locate existing oil drain line against frame and in PSI-SW Assy bracket cutout before securing PSI-SW Assy (76070-55207-073) to frame.(11) Using proper edge distance, transfer drill four existing rivet holes from bulkhead to PSISW Assy (76070-55207-073) mounting bracket. (12) Deburr sharp edges as required (Unless otherwise specified: 0.005 to 0.015-inch radius all edges).(13) Deburr rivet holes in PSI-SW Assy bracket, clean area using low lint cleaning cloth (MILC-85043 orequivalent) moistened with isopropyl alcohol (TT- I -735 orequivalent). (14) Apply epoxy primer (MIL-P-23377 or equivalent) to any bare metal and let dry. (15) Secure PSI-SW Assy (76070-55207-073) using four rivets (M7885/4-5-03) into rivet holes in bulkhead (More than four rivets may need to be removed and replaced as required for proper installation). NOTE: Vertical frame adjacent to hose assembly may not exist in some helicopters. If this is the case, proceed to next step (19). If vertical frame exists, proceed to next step. (16) Drill one (0.203-inch diameter) finished hose clamp hole in adjacent vertical frame as required to support hose assembly (AS117-04-0190). (17) Deburr hole, clean area using low lint cleaning cloth (MIL-C-85043 or equivalent) moistened with isopropyl alcohol (TT- I -735 or equivalent). (18) Apply epoxy primer (MIL-P-23377 or equivalent) to any bare metal and let dry. (19) Secure hose assembly (AS117-04-0190) to adjacent frame clamp hole using clamp (MS21919WCJ6), screw (MS27039-1-24), two flat washers (NAS1149C0332R), spacer (NAS43DD3-64FC), and nut (MS21044-3). (20) Install spiral wrap (R23100-5) on hose assembly (AS117-04-0190). (21) Using sleeve marker (SS7094-S2-175-9) and indelible ink, (mark in 0.12-inch high characters) identify harness as 76070-55207-044 and install sleeve marker around harness. No. 76-66-48B POWERTRAIN - Main GearBox - Electric RotorBrake (ERB) - One-Time Modification of 3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

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### (22) Final tighten all fittings, nuts, and bolts. C. Rotor Brake Modification 76070-55207-013 (Part of Modification Kit Rotor Brake Installation 76070-55207-011): NOTE: • Make certain that relay box assy (76070-55207-041) does not interfere with full deflection of flight controls or existing components when choosing an installation location. • Installation location of relay box assy (76070-55207-041) may vary due to variation of helicopter. • Take into consideration the location of decals and harness connectors on relay box assembly to surrounding component interference. (1) Locate suitable location (on ceiling frame aft of broom closet) area of STA 120.125, WL 115.02, and BL 9.75 to mount relay box assy (76070-55207-041) to frame (76201-23001- 044, ref.) (Figure 3). (2) Drill four (0.177-inch diameter) finished mounting holes through frame (76201-23001-044 ref.) to install relay box assembly (76070-55207-041). (3) Deburr rivet holes, clean area using low lint cleaning cloth moistened with isopropyl alcohol (TT- I -735 orequivalent). (4) Apply epoxy primer (MIL-P-23377 or equivalent) to any bare metal and let dry. (5) Using screw (MS27039-0807), flat washer (NAS1149DN816J), and nut (MS21044N08), secure relay box assembly (76070-55207-041) to frame. Typical four places. NOTE: Use existing ground if available. If existing ground is available, proceed to step (8). If unavailable go to next step. (6) Drill one (0.203-inch diameter) finished hole to secure relay box assembly (76070-55207- 041) ground wires (G5529A20N and G5528A20N) (if required). NOTE: Do not prime or paint hole. (7) Deburr hole, clean area using low lint cleaning cloth (MIL-C-85043 or equivalent) moistened with isopropyl alcohol (TT- I -735 or equivalent). (8) Procure or fabricate (decal) identification (76070-55207-105). (9) Install identification (76070-55207-105) to frame (76201-23001-044 ref.). (10) Apply electrical connector identity plate (SS9014P2RB) (decal) to frame (76201-23001-044 ref.). No. 76-66-48B POWERTRAIN - Main GearBox - Electric RotorBrake (ERB) - One-Time Modification of 3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

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### (11) Using indelible ink, reidentify relay box assembly as 76070-55207-041. D. DC Junction Box Modification (76070-55207-045) (Part of Rotor Brake Installation Modification Kit 76070-55207-011): NOTE: • Prior to incorporation of this modification, CSN 76-113 must be complied with on helicopters prior to S/N 760250. • CSN 76-113 added second rotor brake circuit breaker CR11/DC, CR12/DC, and associated wiring to the DC Junction Box. • Use lacing tape (SS7057-2) to secured sleeve marker (SS7094-S2-175-9) to wire or harness. (1) Access DC Junction Box (76550-03004-041/-049/-051/-053/-055/-056/-058/-060) attached to transitional ceiling in the electrical compartment behind the baggage compartment. (2) Remove coverfrom DC Junction Box perapplicable maintenance manual. (3) Remove lockwasher and nut securing circuit breaker CB7/DC to DC Junction Box and keep for reuse (Figure 4). (4) Push circuit breaker (CB7/DC) into DC Junction Box. (5) Secure circuit breaker (CB7/DC) using saved lockwasher and nut. (6) Using supplied wire (SS7614-20-9, part of modification kit 76070-55207-045), crimp on terminal (M7928/1-23) on new wire (G5520A20) and connect to CB7/DC terminal with existing wire (W2-062-936-20) (Figure 4). (7) Route opposite end of wire (G5520A20) to K4/DC relay, trim and install insulation sleeve (SS7072P0250S005). (8) Connect terminal (M7928/1-22) to wire (G5520A20) and connect to K4-22. (9) Identify wire (G5520A20) using sleeve marker (SS7094-S2-175-9) and indelible ink (mark in 0.12-inch high characters) and install. (10) Using supplied wire (SS7614-20-9), install insulation sleeve (SS7072P0250S005) and crimp on terminal (M7928/1-22). (11) Route wire (G5521A20) to K4/DC, trim, crimp on terminal (M7928/1-22) and connect to K4/DC-21. (12) Identify wire (G5521A20) using sleeve marker (SS7094-S2-175-9) and install. No. 76-66-48B POWERTRAIN - Main GearBox - Electric RotorBrake (ERB) - One-Time Modification of 3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

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### (13) Route opposite end of wire (G5521A20) through suitable hole in DC Junction Box and to splice group (SGRB-8) near relay box assembly (76070-55207-041). Wire (G5521A20) will be joined to two wires at splice area (SGRB-8). (14) Shrink all insulation sleeve (SS7072P0250S005) installed on all relay solder contacts. (15) Perform a point-to-point continuity test on all new wires. (16) Using sleeve marker (SS7094-S2-175-9) and indelible ink, mark in 0.12-inch high characters as modified by 76070-55207-045 and install sleeve marker around wires (G5521A20 and G5520A20). E. Install Right Hand Relay Panel Modification kit 76070-55207-047 (Part of Rotor Brake Installation Modification Kit 76070-55207-011) forHelicopterS/Ns 760001 through 760249 as follows: NOTE: • ForHelicopterS/Ns 760250 and subsequent go to Section F. • CSN 76-66-7 installed resistor R6/2R on helicopters with S/Ns 76001 through 760144. If CSN was not complied with on helicopters 76001 through 760144, helicopter will not have resistor R6/2R installed. • All wire/cable marker sleeves and heat shrinkable tubing shall be marked as modified by 76070-55207-047. • Install new wires between relay K39 and connector J2/2R as shown. Insulate exposed terminals with heat shrink supplied in modification kit. • Prior to incorporation of this modification, CSN 76-66-10 must be complied with on helicopters prior to S/Ns 76190. CSN added relay K39 and associated wires to the RH relay panel. • Use lacing tape (SS7057-2) to secured sleeve marker (SS7094-S2-175-9) to wire or harness. (1) Locate RH relay panel (76550-02004-049/-053/-055/-057/-059/-061/-065) at pilot aft ceiling. (2) Disconnect connectors P104, P106, and P114 from RH relay panel (76550-02004-049/- 053/-055/-057/-059/-061/-065) per applicable maintenance manual and remove RH relay panel. (3) Move RH relay panel (76550-02004-049/-053/-055/-057/-059/-061/-065) to suitable work bench (Figure 5). (4) Remove associated wiring from relay K7 and resistor R6/2R as follows: (a) Wire (W6-301-9544-20) from K7-B2 to J2/2R-(K. (b) Wire (W6-300-9543-20) from K7-B1 to K39-A3. (c) Wire (W6-133-9157-24) from K7-A2 to J2/2R-P. No. 76-66-48B POWERTRAIN - Main GearBox - Electric RotorBrake (ERB) - One-Time Modification of 3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

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### (d) Wire (W6-147-9025-24) from K7-A1 to K7-X1. (e) Wire (W6-128-9025-24) from K7-X1 to J2/2R-M. (f) Wire (W6-132-9156-24) from J2/2R-N to K7-X2. (g) Wire (W6-290-9533-22 from K7-X2 to E35 (at R6/2R). (h) Wire (W6-289-9532-22) from E36 (at R6) to K7-X1. (5) Install filler(MS27488-20) in J2/2R-P and J2/2R-N cavities. (6) Using bulk wire (SS7614-22-9) part of modification kit 76070-55207-047, crimp on contact (M39029/4-110) to new wire (RB-K39-B3-A22) and insert into J2/2R-(K. (7) Route opposite end of wire (RB-K39-B3-A22) to K39, trim wire, and install insulation sleeve (SS7072P0250S005). (8) Using indelible ink, identify wire (RB-K39-B3-A22) with sleeve marker (SS7094-S2-175-9) and install. (9) Using bulk wire (SS7614-22-9), route from K39 -B3 to K39-A3 and trim. (10) Identify as new wire (RB-K39-A3-A22) using indelible ink on sleeve marker (SS7094-S2- 175-9) and install. (11) Identify wire (RB-K39-A3-A22) using indelible ink on sleeve marker (SS7094-S2-175-9), and install. (12) Install insulation sleeve (SS7072P0250S005) and solderopposite end of wire (RB-K39-A3- A22) to K39-A3. (13) Using bulk wire (SS7614-22-9), crimp on contact (M39029/4-110) to wire (RB-K39-B2-A22) and insert into J2/2R-M. (14) Route opposite end of wire (RB-K39-B2-A22) to K39, trim wire, install insulation sleeve (SS7072P0250S005). (15) Using indelible ink, identify wire (RB-K39-B2-A22) with sleeve marker (SS7094-S2-175-9) and install. (16) Solderopposite end of wire (RB-K39-B2-A22) to K39-B2. (17) Shrink all insulation sleeve (SS7072P0250S005) installed on all relay solder contacts. No. 76-66-48B POWERTRAIN - Main GearBox - Electric RotorBrake (ERB) - One-Time Modification of 3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

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### (18) Using indelible ink, identify wires (RB-K39-B3-A22, RB-K39-A3-A22, and RB-K39-B2-A22) with sleeve marker (SS7094-S2-175-9) as modified by 76070-55207-047 and install around the three wires (harness). (19) Perform a point-to-point continuity test on all new wires. (20) Reinstall modified RH relay panel (76070-55207-047). (21) Connect connectorP104 to RH relay panel connectorJ1/2R. (22) Connect connectorP106 to RH relay panel connectorJ2/2R. (23) Connect connectorP114 to RH relay panel connectorJ3/2R. F. Install Right Hand Relay Panel Modification kit 76070-55207-046 (Part of Rotor Brake Installation, Modification Kit 76070-55207-011) forHelicopterS/Ns 760250 and Subsequent as follows: NOTE: • For helicopters S/Ns 760001 through 760249 go to Section E., Right Hand Relay Panel Modification kit 76070-55207-047. • All wire/cable marker sleeves and heat shrinkable tubing shall be marked as modified by 76070-55207-046. • Use lacing tape (SS7057-2) to secured sleeve marker (SS7094-S2-175-9) to wire or harness. (1) Locate right relay panel. (2) Disconnect connectors P104, P106, and P114 from right relay panel (76550-02016-045/- 047/-048) per applicable maintenance manual and remove RH relay panel. (3) Move RH relay panel (76550-02016-045/-047/-048) to suitable work bench (Figure 5). (4) Remove associated wiring from relay K7 and resistor R6 as follows: (a) Wire (W6-301-9545-20) from K7-B2 to J2/2R-(K. (b) Wire (W6-300-9567-20) from K7-B1 to K39-A3. (c) Wire (W6-133-9157-20) from K7-A2 to J2/2R-P. (d) Wire (W6-175-9025-20) from K7-A1 to SGXK17-5. (e) Wire (W6-147-9025-20) from K7-X1 to SGXK17-5. (f) Wire (W6-176-9156-22) from K7-X2 to SGXK27-2. No. 76-66-48B POWERTRAIN - Main GearBox - Electric RotorBrake (ERB) - One-Time Modification of 3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

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### (g) Wire (W6-132-9156-22 from J2/2R-N to SGXK27-2. (h) Wire (W6-290-9156-20) from E35 (at R6) to SGXK27-2. (i) Wire (W6-289-9025-20) from E36 (at R6) to SGXK17-5. (j) Wire (W6-128-9025-20) from J2/2R-M to SGXK17-5. (5) Install filler(MS27488-20) in J2/2R-P and J2/2R-N cavities. NOTE: • Install new wires between K39 and J2/2R as shown. Insulate exposed terminals with heat shrink supplied in modification kit. • All exposed terminal shall be insulated. (6) Using bulk wire (SS7614-22-9) part of modification kit 76070-55207-046, crimp on contact (M39029/4-110) to new wire (RB-K39-B3-A22) and route opposite end to splice group (SGXK39-1) and trim. (7) Install insulation sleeve (SS7072P0250S005) and using indelible ink, identify wire (RB-K39- B3-A22) with sleeve marker (SS7094-S2-175-9), and install. (8) Insert contact (M39029/4-110) on wire (RB-K39-B3-A22) into connector J2/2R-(K. (9) Using bulk wire (SS7614-22-9), route new wire (RB-K39-A3-A22) from SGXK39-1 to K39- A3 and trim. (10) Crimp on contact (M39029/22-192) on end of wire (RB-K39-A3-A22), install insulation sleeve (SS7072P0250S005) and insert into K39-A3. (11) Identify as new wire (RB-K39-A3-A22) using indelible ink on sleeve marker (SS7094-S2- 175-9) and install. (12) Using bulk wire (SS7614-22-9), route new wire (RB-K39-B3-B22) from SGXK39-1 to K39- B3 and trim. (13) Crimp socket contact (M39029/22-192) on wire (RB-K39-B3-B22), install insulation sleeve (SS7072P0250S005) and insert into K39-B3. (14) Using splice (M81824/1-2), join wires (RB-K39-B3-A22, RB-K39-A3-A22 and RB-K39-B3- B22) at splice group (SGXK39-1). (15) Using bulk wire (SS7614-22-9), crimp contact (M39029/4-110) on wire (RB-K39-B2-A22) and insert into (J2/2R-M). No. 76-66-48B POWERTRAIN - Main GearBox - Electric RotorBrake (ERB) - One-Time Modification of 3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

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### (16) Route opposite end of wire (RB-K39-B2-A22) to K39, trim wire, install insulation sleeve (SS7072P0250S005). (17) Crimp socket contact (M39029/22-192) on wire (RB-K39-B2-A22) and insert into K39-B2. (18) Heat shrink all insulation sleeve (SS7072P0250S005) installed on all exposed relay solder contacts. (19) Using indelible ink, identify wires (RB-K39-B3-B22, RB-K39-B2-A22, and RB-K39-A3-A22) with sleeve marker (SS7094-S2-175-9) as modified by 76070-55207-046 and install around the three wires. (20) Perform a point-to-point continuity test on all new wires. (21) Reinstall right relay panel (76070-55207-046). (22) Connect connector P104 to right relay panel connector J1/2R. (23) Connect connector P106 to right relay panel connector J2/2R. (24) Connect connector P114 to right relay panel connector J3/2R. G. Harness Assembly Modification kit (76070-55207-043) (part of Rotor Brake Installation, Modification Kit 76070-55207-011): NOTE: • Route wire on existing harnesses and secure using cable ties. Use good shop wiring practice. • Use lacing tape (SS7057-2) (string ties) to secured sleeve marker (SS7094-S2-175-9) to wire or harness. (1) Extract existing contact from P2RB-9 and using bulk wire (SS7614-20-9), crimp on contact to new wire (G5521B20) (Figure 4). (2) Reinstall contact on wire (G5521B20) into P2RB-9. (3) Route opposite end of wire (G5521B20) to splice group (SGRB-8) and trim. (4) Identify as new wire (G5521B20) using indelible ink on sleeve marker (SS7094-S2-175-9) and install sleeve marker. (5) Extract existing contact from P2RB-2 and using bulk wire (SS7614-20-9), crimp on contact to new wire (G5521C20). (6) Reinstall contact on wire (G5521C20) into P2RB-2. No. 76-66-48B POWERTRAIN - Main GearBox - Electric RotorBrake (ERB) - One-Time Modification of 3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

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### (7) Route opposite end of wire (G5521C20) to splice group (SGRB-8) and trim. (8) Join three new wires (G5521A20), (G5521B20), and (G5521C20) at splice group (SGRB-8) using splice (M81824/1-2). (9) Extract existing contact from P2RB-7 and using bulk wire (SS7614-24H-9, part of modification kit 76070-55207-043), crimp on contact to new wire (G5501D24). (10) Reinstall contact on wire (G5501D24) into P2RB-7. (11) Route opposite end of wire (G5501D24) to splice group (SGRB-11) and trim. (12) Identify as new wire (G5501D24) using indelible ink on sleeve marker (SS7094-S2-175-9) and install sleeve marker. (13) Remove existing wire (G5501B24) from RH relay panel connector J2/2R-P and replace removed contact with seal plug (MS27488-20). (14) Route wire (G5501B24) to splice group (SGRB-11) and trim. (15) Join two wires (G5501D24) and (G5501B24) at splice group (SGRB-11) using splice (M81824/1-1). (16) Extract existing contact from P2RB-6 and using bulk wire (SS7614-24H-9, part of modification kit 76070-55207-043) crimp on contact to new wire (G5500D24). (17) Reinstall contact on wire (G5500E24) into P2RB-6. (18) Route opposite end of wire (G5500E24) to splice group (SGRB-9) and trim. (19) Extract existing contact from P2RB-10 and using bulk wire (SS7614-24H-9, part of modification kit 76070-55207-043) crimp on contact to new wire (G5500E24). (20) Install contact on wire (G5500E24) into P2RB-10. (21) Route opposite end of wire (G5500E24) to splice group (SGRB-9) and trim. (22) Using bulk wire (SS7614-24H-9, part of modification kit 76070-55207-043), route one end of new wire (G5500C24) from splice group (SGRB-9) to splice group (SGRB-10) and trim. (23) Join three wires (G5500D24, G5500E24, and G5500C24) at splice group (SGRB-9) using splice (M81824/1-1). (24) Extract existing contact on wire (G5500B24) from P106-M. No. 76-66-48B POWERTRAIN - Main GearBox - Electric RotorBrake (ERB) - One-Time Modification of 3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

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### (25) Route wire (G5500B24) to SGRB-10. Trim excess wire and unused contact. (26) Join two wires (G5500C24 and G5500B24) at splice group (SGRB-10) using splice (M81824/1-1). (27) Extract existing contact from P2RB-8 and crimp contact onto negative lead of (diode) suppressor (SS7048-4). (28) Insert contact on negative lead of (diode) suppressor (SS7048-4) into P2RB-8. (29) Route positive lead of (diode) suppressor (SS7048-4) to SGRB-12 and trim. (30) Using bulk wire (SS7614-20-9, part of modification kit 76070-55207-043) route new wire (G5522B20) from SGRB-12 to RH relay panel and trim. (31) Crimp socket contact (M39029/5-115) on end of wire (G5522B20) and insert into P106-M. (32) Join two wires (G5522B20 and end of (diode) suppressor (SS7048-4) positive lead) at splice group (SGRB-12) using splice (M81824/1-1). (33) Extract existing contact from P2RB-5 and using bulk wire (SS7614-20-9, part of modification kit 76070-55207-043) crimp on contact to new wire (G5524A20). (34) Install new wire (G5524A20) into strain relief (M85049/52-1-10W). (35) Reinstall contact on wire (G5524A20) into connector P2RB-5. (36) Identify as wire (G5524A20) using indelible ink on sleeve marker (SS7094-S2-175-9) and install sleeve marker. (37) Route opposite end of wire (G5524A20) to PSI-SW Assy (76070-55207-073) connector (MS3476W10-6P) P1RB and trim. (38) Crimp socket contact (M39029/4-110) on wire (G5524A20) and insert into P1RB-B. (39) Extract existing contact from P2RB-4 and using bulk wire (SS7614-20-9, part of modification kit 76070-55207-043) crimp on contact to new wire (G5529A20N). (40) Reinstall contact on wire (G5529A20N) into connector P2RB-4. NOTE: • Use existing ground if available. If existing ground is available, proceed to step (39). If existing ground not available proceed to next step. • Locate ground as close to unit as possible. No. 76-66-48B POWERTRAIN - Main GearBox - Electric RotorBrake (ERB) - One-Time Modification of 3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

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### (41) Drill one (0.203-inch diameter) finished hole to secure ground wires (G5529A20N) (if required). NOTE: Do not prime or paint hole. (42) Deburr hole, clean area using low lint cleaning cloth (MIL-C-85043 or equivalent) moistened with isopropyl alcohol (TT- I -735 or equivalent). (43) Route opposite end of wire (G5529A20N) to (0.203-inch diameter) drilled ground hole (if drilled) adjacent to installed relay box (76070-55207-041) on frame (76201-23001-044) location and trim. (44) Crimp terminal (M7928/1-24) on wire (G5529A20N). (45) Identify as new wire (G5529A20N) using indelible ink on sleeve marker (SS7094-S2-175-9) and install sleeve marker. NOTE: Surface preparation and assembly procedure for electrical bonded connections shall be in accordance with sound practice at all mating surfaces. (46) Using screw (MS27039-1-09), flat washer (NAS1149F0316P), flat washer (NAS1149D0363J), lock washer (MS35338-43) and nut (MS21044N3), secure terminal (M7928/1-24) on wire (G5529A20N) from relay box assembly (76070-55207-041) connector P2RB-4 (if required). (47) Extract existing contact from P2RB-11 and using bulk wire (SS7614-20-9, part of modification kit 76070-55207-043) crimp on contact to new wire (G5528A20N). (48) Reinstall contact on wire (G5528A20N) into P2RB-11. NOTE: • Use existing ground if available. If existing ground is available proceed to step (47). • Locate ground as close to unit as possible. (49) Drill one (0.203-inch diameter) finished hole to secure ground wires (G5528A20N) (if required). NOTE: Do not prime or paint hole. (50) Deburr hole, clean area using low lint cleaning cloth (MIL-C-85043 or equivalent) moistened with isopropyl alcohol (TT- I -735 or equivalent). (51) Route opposite end of wire (G5528A20N) to 0.203-inch diameter drilled ground hole (if drilled) adjacent to installed relay box (76070-55207-041) on frame (76201-23001-044 ref.) location and trim. No. 76-66-48B POWERTRAIN - Main GearBox - Electric RotorBrake (ERB) - One-Time Modification of 3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

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### (52) Crimp terminal (M7928/1-24) on wire (G5528A20N). (53) Identify as wire (G5528A20N) using indelible ink on sleeve marker (SS7094-S2-175-9) and install sleeve marker. NOTE: Surface preparation and assembly procedure for electrical bonded connections shall be in accordance with sound practice at all mating surfaces. (54) Using screw (MS27039-1-09), flat washer (NAS1149F0316PJ), flat washer (NAS1149DN816P), lock washer (MS35388-43) and nut (MS21044N3), secure terminal (MS27488-20) on wire (G5529A20N) from relay box assembly (76070-55207-041) connector P2RB-4 (if required). (55) Remove existing wire (G5517A20) from P106-L and bomb by installing cap (MS25274-2) on wire end. (56) Remove existing wire (G5514B24) from P106-N and bomb by installing cap (MS25274-2) on wire end. (57) Install seal plug (MS27488-20) into J2/2R-N. (58) Using bulk wire (SS7614-20-9, part of modification kit 76070-55207-043) crimp on contact (M39029/5-115) to new wire (G5523A20). (59) Insert contact (M39029/5-115) on new wire (G5523A20) into J2/2R-L. (60) Route opposite end of new wire (G5523A20) to splice group (SGRB-13) and trim. (61) Splice wire (G5523A20) to positive lead of (diode) suppressor (SS7048-4) using splice (M81824/1-1). (62) Extract existing contact from P2RB-3. (63) Crimp on existing contact to negative lead of (diode) suppressor (SS7048-4) and insert into P2RB-3. (64) Extract existing contact from P2RB-1 and using bulk wire (SS7614-20-9, part of modification kit 76070-55207-043) crimp on contact to new wire (G5525A20). (65) Install new wire (G5525A20). into strain relief (M85049/52-1-10W). (66) Reinstall contact on wire (G5525A20) into P2RB-1. (67) Route opposite end of wire (G5525A20) to PSI-SW Assy (76070-55207-073) connector (MS3476W10-6P) P1RB and trim. No. 76-66-48B POWERTRAIN - Main GearBox - Electric RotorBrake (ERB) - One-Time Modification of 3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

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### (68) Crimp contact (M39029/4-110) on opposite end of wire (G5525A20) and insert into connectorP1RB-C. (69) Identify as wire (G5525A20) using indelible ink on sleeve marker (SS7094-S2-175-9) and install sleeve marker. (70) Install harness assembly (76070-55207-044) if not already done so as follows: (a) Remove existing red wire from PSI-SW Assy (76070-55207-073) connector J1RB-E and bomb by installing cap (MS25274-2) on wire end. (b) Remove existing green wire from PSI-SW Assy (76070-55207-073) connector J1RB-F and bomb by installing cap (MS25274-2) on wire end. (c) Install seal plug (MS27488-20) into P1RB-E. (d) Install seal plug (MS27488-20) into P1RB-F. (e) Route white, black, yellow, and brown lead wires attached to PSI-SW Assy (76070- 55207-073) to receptorconnector(MS3470W10-6S) and trim all. (f) Install strain relief (M85049/52-1-10W) onto white, black, yellow, and brown lead wires. (g) Crimp socket contacts (M39029/5-115) on white, black, yellow, and brown wires attached to PSI-SW Assy (76070-55207-073). (h) Insert socket contact (M39029/5-115) on white wire into receptor connector (MS3470W10-6S) J1RB-A. (i) Insert socket contact (M39029/5-115) on black wire into receptor connector (MS3470W10-6S) J1RB-B. (j) Insert socket contact (M39029/5-115) on yellow wire into receptor connector (MS3470W10-6S) J1RB-C. (k) Insert socket contact (M39029/5-115) on brown wire into receptor connector (MS3470W10-6S) J1RB-D. (l) Install strain relief (M85049/52-1-10W) on white, black, yellow, and brown lead wires and secure to receptor connector (MS3470W10-6S). (71) Using bulk wire (SS7614-20-9, part of modification kit 76070-55207-043) crimp on contact (M39029/4-110) to new wire (G5526A20N). (72) Install new wire (G5526A20N) into strain relief (M85049/52-1-10W). No. 76-66-48B POWERTRAIN - Main GearBox - Electric RotorBrake (ERB) - One-Time Modification of 3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

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### (73) Reinstall contact (M39029/4-110) and wire (G5526A20N) into connector P1RB-A. NOTE: Use existing ground if available. If existing ground is available proceed to step (70). If existing ground is not available proceed to next step. (74) Drill one (0.203-inch diameter) finished hole to secure ground wires (G5526A20N) (if required). NOTE: Do not prime or paint hole. (75) Deburr hole, clean area using low lint cleaning cloth (MIL-C-85043 or equivalent) moistened with isopropyl alcohol (TT- I -735 or equivalent). (76) Route opposite end of wire (G5526A20N) to 0.203-inch diameter drilled ground hole (if drilled) adjacent to installed PSI-SW Assy (76070-55207-073) on bulkhead (76201-03008 ref.) location and trim. (77) Crimp terminal (M7928/1-24) on wire (G5526A20N). (78) Identify as new wire (G5526A20N) using indelible ink on sleeve marker (SS7094-S2-175-9) and install sleeve marker. NOTE: Surface preparation and assembly procedure for electrical bonded connections shall be in accordance with sound practice at all mating surfaces. (79) Using screw (MS27039-1-09), flat washer (NAS1149F0316P), flat washer (NAS1149D0363J), lock washer (MS35388-43) and nut (MS21044N3), secure terminal (M7928/1-24) on wire (G5526A20N) (if required). (80) Using bulk wire (SS7614-20-9, part of modification kit 76070-55207-043) crimp on contact (M39029/4-110) to new wire (G5527A20N). (81) Install contact (M39029/4-110) and wire (G5527A20N) into P1RB-D. (82) Install new wire (G5527A20N) into strain relief (M85049/52-1-10W). NOTE: Use existing ground if available. If existing ground is available proceed to step (78). If existing ground is not available proceed to next step. (83) Drill one (0.203-inch diameter) finished hole to secure ground wire (if required). NOTE: Do not prime or paint hole. (84) Deburr hole, clean area using low lint cleaning cloth (MIL-C-85043 or equivalent) moistened with isopropyl alcohol (TT- I -735 or equivalent). No. 76-66-48B POWERTRAIN - Main GearBox - Electric RotorBrake (ERB) - One-Time Modification of 3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

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### (85) Route opposite end of wire (G5527A20N) to 0.203-inch diameter drilled ground hole (if drilled) adjacent to installed PSI-SW Assy (76070-55207-073) on bulkhead (76201-03008 ref.) location and trim. (86) Crimp terminal (M7928/1-24) on wire (G5527A20N). (87) Identify as wire (G5527A20N) using indelible ink on sleeve marker (SS7094-S2-175-9) and instal sleeve marker. NOTE: Surface preparation and assembly procedure for electrical bonded connections shall be in accordance with sound practice at all mating surfaces. (88) Using screw (MS27039-1-09), flat washer (NAS1149F0316P), flat washer (NAS1149D0363J), lock washer (MS35388-43) and nut (MS21044N3), secure terminal (M7928/1-24) on wire (G5527A20N) (if required). (89) Perform a point-to-point continuity test on all new wires. (90) Using indelible ink, identify fourwires (G5526A20N, G5524A20, G5525A20, and G5527A20N) with sleeve marker (SS7094-S2-175-9) as modified by 76070-55207-043 and install sleeve marker around the four wire harness. (91) Using indelible ink, identify eleven wires making up harness assembly (76070-55207-043) on relay box assembly (76070-55207-041) connector P2RB with sleeve marker (SS7094- S2-175-9) as modified by 76070-55207-043 and install sleeve marker around the eleven wire harness. (92) After modification reidentify the applicable components using contrasting ink, 0.12-inch high characters and crossing out the old identification numbers with a single line: (a) Reidentify (DC) junction box assembly 76550-03004-041 to 76070-55207-050. (b) Reidentify (DC) junction box assembly 76550-03004-051 to 76070-55207-051. (c) Reidentify (DC) junction box assembly 76550-03004-049 to 76070-55207-052. (d) Reidentify (DC) junction box assembly 76550-03004-053 to 76070-55207-053. (e) Reidentify (DC) junction box assembly 76550-03004-055 to 76070-55207-054. (f) Reidentify (DC) junction box assembly 76550-03004-056 to 76070-55207-055. (g) Reidentify (DC) junction box assembly 76550-03004-058 to 76070-55207-056. (h) Reidentify (DC) junction box assembly 76550-03004-060 to 76070-55207-057. No. 76-66-48B POWERTRAIN - Main GearBox - Electric RotorBrake (ERB) - One-Time Modification of 3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

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### (i) Reidentify (RH relay assembly) panel assembly 76550-02016-045 to 76070-55207-058. (j) Reidentify (RH relay assembly) panel assembly 76550-02016-047 to 76070-55207-059. (k) Reidentify (RH relay assembly) panel assembly 76550-02016-048 to 76070-55207-060. (l) Reidentify (RH relay assembly) panel assembly 76550-02016-049 to 76070-55207-061. (m) Reidentify (RH relay assembly) panel assembly 76550-02016-057 to 76070-55207-062. (n) Reidentify (RH relay assembly) panel assembly 76550-02016-055 to 76070-55207-063. (o) Reidentify (RH relay assembly) panel assembly 76550-02016-053 to 76070-55207-064. (p) Reidentify (RH relay assembly) panel assembly 76550-02016-059 to 76070-55207-065. (q) Reidentify (RH relay assembly) panel assembly 76550-02016-061 to 76070-55207-066. (r) Reidentify (RH relay assembly) panel assembly 76550-02016-063 to 76070-55207-067. (s) Reidentify (RH relay assembly) panel assembly 76550-02016-065 to 76070-55207-068. (t) Reidentify (RH relay assembly) panel assembly 76550-02016-041 to 76070-55207-069. (u) Reidentify (RH relay assembly) panel assembly 76550-02016-042 to 76070-55207-070. (v) Reidentify (RH relay assembly) panel assembly 76550-02016-044 to 76070-55207-071. (93) Connect harness connectorP1RB to PSI-SW Assy (76070-55207-073) connectorJ1RB. (94) Connect electrical connector to rotor brake accumulator/reservoir on main gear box upper housing perapplicable maintenance manual. (95) Connect electrical power connector (+ and - terminals) to battery. H. Ground Operational Test For Electrical-Hydraulic Rotor Brake: (a) Perform a point-to-point continuity check of new wires added per 76070-55207-043, 76070-55207-044, 76070-55207-045, and 76070-55207-046 (if not done prior). (b) On MasterSwitch Panel, verify the ROTOR BRAKE switch is in the OFF position. (c) Verify helicopter battery is installed and connected. No. 76-66-48B POWERTRAIN - Main GearBox - Electric RotorBrake (ERB) - One-Time Modification of 3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

September11/07 Page 24 66-50-00 Revisio n B - July 08/09

### (d) On instrument panel remove the copilot’s Triple Tachometer indicator and disconnect connectorP21. (e) On lower circuit breaker panel verify RTR BRK WARN circuit breaker is pushed in. (f) On DC Junction Box verify circuit breaker CB6/DC ROTOR BRAKE and circuit breaker CB7/DC ROTOR BRAKE are pushed in. (g) Verify both No. 1 and No. 2 engine speed control levers are at ground idle or less than. (h) Hinge open No. 1 engine airinlet cowling. Disconnect connectorP920 from rotorbrake module and place a 28VDC test lamp across pins N and K, and a second 28VDC test lamp across pins E, and L of connector P920. (i) Disconnect connector P1RB located on the manifold pressure switch bracket. Place a jumperbetween pins A and B, and a second jumperbetween pins C and D of connectorP1RB. (j) Verify that BATT switch on the Master Switch Panel is in the OFF position. (k) On MasterSwitch Panel, place ROTOR BRAKE switch to the ON position. RESULT: Test lamp in P920 across pins N and K illuminate immediately and 5 seconds +/- 2 seconds latertest lamp across pins E and L illuminate. (l) On MasterSwitch Panel, place ROTOR BRAKE switch to the OFF position. RESULT: Test lamps in P920 extinguish. (m) On connectorP920, remove test lamp installed between N and K and install test lamp across pins J and G of P920. (n) Connect a source of external DC power to helicopter and place EXT POWER switch, on the masterswitch panel, to ON. RESULT: On the caution advisory panel the ROTOR BRAKE caution light will be flashing about two time a second. Test lamp in P920 across pins J and G shall illuminate and test lamp across pins E and L shall remain extinguished. (o) On the lower circuit breaker panel verify STR CNTOR circuit breaker is pushed in. (p) On the masterswitch panel place the MASTER START switch to ON. RESULT: On the caution advisory panel the ROTOR BRAKE caution light will illuminate steady and no change to test lamps installed in P920. No. 76-66-48B POWERTRAIN - Main GearBox - Electric RotorBrake (ERB) - One-Time Modification of 3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

September11/07 Page 25 66-50-00 Revisio n B - July 08/09

### (q) On lower circuit breaker panel pull out RTR BRK WARN circuit breaker. RESULT: On the caution advisory panel the ROTOR BRAKE caution light will be flashing about two times a second and no change to test lamps installed in P920. (r) On lower circuit breaker panel push in RTR BRK WARN circuit breaker. RESULT: On the caution advisory panel the ROTOR BRAKE caution light will illuminate steady and no change to test lamps installed in P920. (s) On the Masterswitch panel, place the ROTOR BRAKE switch to the ON position. RESULT: On the caution advisory panel the ROTOR BRAKE caution light shall remain illuminated steady and test lamp in P920 across pins G and J extinguish and test lamp across pins E and L illuminate 5 seconds +/- 2 seconds after the rotor brake switch is set to the ON position. (t) Move No. 1 engine speed control lever forward out of idle. RESULT: On the caution advisory panel the ROTOR BRAKE caution light shall remain illuminated steady and test lamp across pins E and L shall extinguish. (u) Move No. 1 engine speed control lever back to IDLE position and move No. 2 engine speed control lever forward out of idle. RESULT: On the caution advisory panel the ROTOR BRAKE caution light shall remain illuminated steady and test lamp across pins E and L shall remain extinguished. (v) Move No. 2 engine speed control lever back to IDLE position. RESULT: On caution advisory panel the ROTOR BRAKE caution light shall remain illuminated steady and test lamp across pins E and L shall illuminate. (w) Remove jumpers from connector P1RB. RESULT: On caution advisory panel the ROTOR BRAKE caution light shall extinguish and no change to test lamps installed in connectorP920. (x) Place the ROTOR BRAKE switch to the REL position and hold. RESULT: Test lamp in connectorP920 across pins G and J illuminate and test lamp across pins E and L extinguish. (y) Place ROTOR BRAKE switch to ON position. RESULT: Test lamp in connectorP920 across pins G and J extinguish and test lamp across pins E and L illuminate 5 seconds +/- 2 second after the ROTOR BRAKE switch is in the ON position. (z) On upper circuit breaker panel, verify the No. 1 ENG N2 circuit breaker is pulled out. (aa) On the Triple TachometerconnectorP21, place a jumperbetween pins B and V. No. 76-66-48B POWERTRAIN - Main GearBox - Electric RotorBrake (ERB) - One-Time Modification of 3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

September11/07 Page 26 66-50-00 Revisio n B - July 08/09

### (ab) On the upper circuit breaker panel, No. 1 DC PRI BUS, push in No. 1 ENG N2 circuit breaker. RESULT: Test lamp in connectorP920 across pins E and L shall extinguish. (ac) Place ROTOR BRAKE switch to OFF position. (ad) On lower circuit breaker panel, DC ESNTL BUS, verify the AUD WARN circuit breaker is pushed in and No. 1 ENG N1 and No. 2 ENG N1 circuit breakers are pulled out. (ae) On the upper circuit breaker panel, verify No.1 ENG N1 and No. 2 ENG N1 circuit breakers are pulled out. (af) On connectorP920 place a jumperbetween pins C and D. (ag) Place the ROTOR BRAKE switch to the ON position. (ah) Set No. 1 engine speed leverto stopcock position. Leave No. 2 engine speed leverin IDLE position. (ai) Press and hold No. 1 ENG OUT legend on the copilot’s master warning panel. RESULT: Test lamp in connectorP920 across pins E and L illuminate immediately. (aj) Release No. 1 ENG OUT legend. RESULT: Test lamp in connectorP920 across pins E and L extinguish. (ak) Press and hold No. 1 ENG OUT legend on the pilot’s master warning panel. RESULT: Test lamp in connectorP920 across pins E and L illuminate immediately. (al) Released No. 1 ENG OUT legend. RESULT: Test lamp in connectorP920 across pins E and L extinguish. (am) Set No. 2 engine speed leverto stopcock position and set No. 1 engine speed leverto IDLE position. (an) Press and hold No. 2 ENG OUT legend on the copilot’s master warning panel. RESULT: Test lamp in connectorP920 across pins E and L illuminate immediately. (ao) Release No. 2 ENG OUT legend. RESULT: Test lamp in connectorP920 across pins E and L extinguish. (ap) Press and hold No. 2 ENG OUT legend on the pilot’s master warning panel. RESULT: Test lamp in connectorP920 across pins E and L illuminate immediately. (aq) Released No. 2 ENG OUT legend. RESULT: Test lamp in connectorP920 across pins E and L extinguish. No. 76-66-48B POWERTRAIN - Main GearBox - Electric RotorBrake (ERB) - One-Time Modification of 3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

September11/07 Page 27 66-50-00 Revisio n B - July 08/09

### (ar) On the upper circuit breaker panel, push in No. 1 ENG N1 circuit breaker. RESULT: Test lamp in connectorP920 across pins E and L illuminate immediately. (as) Pull out No. 1 ENG N1 circuit breaker. RESULT: Test lamp in connectorP920 across pins E and L extinguish. (at) On the upper circuit breaker panel, push in No. 2 ENG N1 circuit breaker RESULT: Test lamp in connectorP920 across pins E and L illuminate immediately. (au) Pull out No. 2 ENG N1 circuit breaker. RESULT: Test lamp in connectorP920 across pins E and L extinguish. (av) Pull out No. 1 ENG N2 circuit breaker. RESULT: Test lamp in connectorP920 across pins E and L illuminates after5 +/-2 seconds delay. (aw) Place ROTOR BRAKE switch to the OFF position. RESULT: Test lamp in connectorP920 across pins E and L extinguish. (ax) Turn EXTERNAL POWER switch OFF. (ay) Remove jumpers and test lamps from connector P920. Measure for continuity between pins F, H, and M of connectorP920. RESULT: Resistance measures 0.5 ohm maximum. (az) Reconnect connectorP920 and P1RB. (ba) Remove jumperfrom connectorP21 and reconnect connectorP21 to copilot’s triple tachometerand install tachometerin instrument panel. (bb) Push in all circuit breakers pulled for test on the lower and upper circuit breaker panels. I. Functional Operational Test Electrical-Hydraulic Main Rotor Brake: (1) Connect a source of DC powerto helicopterand place EXT POWER orBATT switch, on the masterswitch panel, to ON. NOTE: It is normal for the ROTOR BRAKE caution light to flash when the DC Essential Buss is powered, ROTOR BRAKE switch is ON and MASTER START switch is OFF. (2) On the masterswitch panel, place the ROTOR BRAKE switch to the ON position. NOTE: Check for any hydraulic leaks on the rotor brake system. No. 76-66-48B POWERTRAIN - Main GearBox - Electric RotorBrake (ERB) - One-Time Modification of 3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

September11/07 Page 28 66-50-00 Revisio n B - July 08/09

### (3) RESULT: On the caution advisory panel the ROTOR BRAKE caution light will be flashing about two times persecond. (4) On the Masterswitch panel place the MASTER START switch to ON. (5) RESULT: On the caution advisory panel the ROTOR BRAKE caution light will illuminate steady. (6) On the Masterswitch panel, place the ROTOR BRAKE switch to the REL position then OFF. RESULT: On the caution advisory panel the ROTOR BRAKE caution light will extinguish within 3 seconds. (7) With a qualified pilot at the controls, start No. 1 and No. 2 engines and operate at 100 Nr. Refer to applicable Flight Manual. (8) Place No. 1 and No. 2 engine speed control lever to idle. (9) After2 minute cool down of engine is observed, shut down No. 1 engine and listen for engine out tone by holding ENG OUT TEST switch to TEST. (10) Allow Nr to stabilize (about 45 percent) and record time from ROTOR BRAKE switch ON until rotor head is stopped. RESULT: Rotorhead should stop within 10 - 15 seconds. ROTOR BRAKE caution should illuminate steady. (11) Place ROTOR BRAKE switch to REL and then OFF. RESULT: ROTOR BRAKE caution shall extinguish. (12) Restart No. 1 engine and operate at idle. (13) Shut down No. 2 engine and listen forengine out tone by holding ENG OUT TEST switch at TEST. (14) Allow Nr to stabilize (about 45 percent) and record time from ROTOR BRAKE switch ON until rotor head is stopped. RESULT: Rotorhead should stop within 10 - 15 seconds. ROTOR BRAKE caution should illuminate steady. (15) Shut down No. 1 engine. No. 76-66-48B POWERTRAIN - Main GearBox - Electric RotorBrake (ERB) - One-Time Modification of 3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

September11/07 Page 29 66-50-00 Revisio n B - July 08/09

### (16) Place ROTOR BRAKE switch to REL and then OFF. RESULT: On the caution advisory panel the ROTOR BRAKE caution light will extinguish within 3 seconds. (17) Shut down No. 1 engine. (18) Turn electrical power OFF. (19) TEST COMPLETE. (20) Install access panels and ducting perapplicable maintenance manual. (21) Close engine airinlet cowl. (22) Return helicopter to service. J. Record of Compliance. (1) Make a log card entry to show compliance with this Alert Service Bulletin. (2) Upon compliance with this Alert Service Bulletin, complete attached ALERT SERVICE BULLETIN COMPLIANCE RECORD CARD and return it to Sikorsky Aircraft Corporation. No. 76-66-48B POWERTRAIN - Main GearBox - Electric RotorBrake (ERB) - One-Time Modification of 3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

September11/07 Page 30 66-50-00 Revisio n B - July 08/09SA TD1294_1 A

A 76650−09803 POWER UNIT ROTOR BRAKE (REF)

76351−09000 MAIN GEAR BOX (REF)

NOTE CLAMP IN APPROXIMATE LOCATION SHOWN. EXISTING OIL DRAIN LINE 76651−09002−066 HOSE ASSEMBLY (REF) INSTALL: AS117−04−0190 HOSE ASSEMBLY − 1 REQ’D (SEE NOTE) INSTALL: MS21919WCJ6 CLAMP − 1 REQ’D MS27039−1−24SCREW − 1 REQ’D NAS1149C0332R WASHER − 2 REQ’D MS21044−N3 NUT − 1 REQ’D 76201−03008 BULKHEAD LH ANGLE (REF) 76070−55207−073 RETAINER − 1 REQ’D INSTALL: DETAIL B (SEE FIGURE 2)

(SEE FIGURE 2) (SEE FIGURE 2)



### PSI-SW ASSEMBLY INSTALLATION FIGURE 1. No. 76-66-48B

September11/07 Page 31 66-50-00 Revisio n B - July 08/09SA TD1294_2 DETAIL B

VIEW A − A LOOKING FORWARD LEFT SIDE STA 215 AFT AS117 − 04 − 0190 HOSE ASSEMBLY (REF) REMOVE: AP2802J04 ELBOW (1) AN6289J4 NUT (1) MS28778 − 4 PACKING (1) MS28773 − 04 RETAINER (1) INSTALL: MS21912J4 TEE − 1 REQ ’ D AN6289J4 NUT − 1 REQ ’ D MS28778 − 4 PACKING − 1 REQ ’ D MS28773 − 04 RETAINER − 1 REQ ’ D INBD

EXISTING OIL DRAIN LINE (REF) 76201 − 03008 BULKHEAD (REF)

0.83 INCH

0.52 INCH APPROX WL 118.00 LBL 21.62

REMOVE: EXISTING RIVETS (4) INSTALL: M7885/4 − 5 − 03 RIVET

− 4 REQ ’ D (SEE FIGURE 1)

(SEE FIGURE 1) (REF) (REF)



### PSI-SW ASSEMBLY INSTALLATION FIGURE 2. No. 76-66-48B

September11/07 Page 32 66-50-00 Revisio n B - July 08/09D

D C C STA FRAME 120.125 76201 − 03001 (REF) INSTALL: MS27039 − 1 − 09 SCREW − 1 REQ ’ D NAS1149D0363J WASHER, FLAT − 1 REQ ’ D NAS1149F0316P WASHER, FLAT − 1 REQ ’ D MS35388 − 43 WASHER, LOCK − 1 REQ ’ D MS21044N3 NUT − 1 REQ ’ D INSTALL: 76070 − 55207 − 073 PSI − SW ASSY − 1 REQ ’ D MS27039 − 0807 SCREW − 4 REQ ’ D NAS1149DN816J WASHER, FLAT − 4 REQ ’ D MS21044N08 NUT − 4 REQ ’ D

2.00 IN. R.09 IN.
0.66 IN. ROTOR BRAKE RELAY BOX 76070 − 55207 − 041 STA FRAME 120.135 76201 − 023001 − 044 (REF) INSTALL: SS9014 − P2RB IDENT PLATE − 1 REQ ’ D

INSTALL: 76070 − 55070 − 105 IDENT PLATE MIL − M43719 − 1 REQ ’ D GROUND WIRE TO P2RB (REF)

BL 9.75 (REF) BL 9.75 (REF) DETAIL E

DETAIL E STA 0.00 (REF) STA 100.00 (REF)

WL 37.00 (REF) WL 115.02 (REF)

BL 0.00 (REF) BL 4.25 (REF) BL 9.75 (REF)

SA TD1652 VIEW C − C LOOKING UP AND AFT PSI − SW ASSY 76070 − 55207 − 073 (REF)

LOOKING INBOARD LH SIDE VIEW D − D



### RELAY BOX ASSEMBLY INSTALLATION FIGURE 3. No. 76-66-48B

September11/07 66-50-00 Page 33 Revisio n B - July 08/09J1 (REF) SPLICE EXISTING WIRE

REMOVE WIRE REROUTE WIRE CAP

DESIGNATION SYMBOL LEGEND232221131211 MASTER START CONTACTOR K4 / DC (REF) K6 / DC A2 K5 / DC A2 A1

A2 K8 / DC A2 K7 / DC A1 X1 X2 2

2 G5520A20 ROTOR BRAKE CB7 / DC (REF) 1

7.5 AMP CR12 / DC (REF)

CR11 / DC (REF)W2−062−936−20

DC JUNCTION BOX 76550 − 03004 (REF)W2−012−90−20W2−050−0−20N

P301 (REF) J1 / DC (REF)K112C20 K5 − X2 K1 − X2 L

SA TD1701_1G5521B20G5521A20G5521C20 15G5501D24G5500D24G5500E24 G5500C24 13 P106 (REF) J2 / 2R (REF)
P
3 M

4 L N
5G5523A20

8G5524A20G5529A20NG5528A20N

5 4 11 3 1G5525A20 17

12

10 6G5501B24 GND DC − 4 16

92 7

RELAY BOX ASSY 76070 − 55207 − 041 (REF) G5527A20N G5526A20N A B E C D F 10

10WHITEBLACKYELLOWBROWNRED

7

7GREEN

6 6 S5 (PART OF MANIFOLD 22114) (REF) <8 1 PSI=OPEN >6 1 PSI=CLOSED SWITCH SHOWN CLOSED S4 (PART OF MANIFOLD 22114) (REF) <8 1 PSI=OPEN >6 1 PSI=CLOSED SWITCH SHOWN OPEN TO ROTOR BRAKE CALIPERS (REF)G5517A20G5514B24

J900 (REF)

P233 (REF) L

B RH RELAY PANEL 76550 − 02004 OR 76550 − 02016 (REF)

9 8 14 11 11

NEW J1RB (REF) P1RB (REF)

P2RB (REF) SGRB − 11

SGRB − 10 SGRB − 9 SGRB − 8 SGRB − 12 12

25 SGRB − 13 12

ROTOR BRAKE 76552 − 10105 ROTOR BRAKE 76552 − 10105

11

PSI − SW ASSY (76070 − 55027 − 073) (REF)76552−10105

25

GROUND CIRCUIT BREAKER NOTE FOR PART CALLOUT SEE

REWORK INDEX FIGURE 6.NEGPOSG5522B20NEGPOSP1−L (REF)G55B0024P118−G (REF)



### ELECTRIC ROTOR BRAKE MODIFICATION KIT SYSTEM SCHEMATIC FIGURE 4. No. 76-66-48B

September11/07 66-50-00 Page 34 Revisio n B - July 08/09SA TD1295_2W6−300−9567−20B3B2B1A3A2A1X1X2W6−133−9157−20W6−175−9025−20W6−147−9025−20 K7 RELAY (REF)W6−176−9156−22W6−132−9156−22 18W6−290−9156−20W6−289−9025−20 R6 / 2R E36 E35

SGXK17 − 5B3B2B1A3A2A1X1X2 K39 RELAY (REF) ROTOR BRAKE AUTO DUMP RELAYRB−K39−B3−A22RB−K39−B3−B22 19RB−K39−B2−A22RB−K39−A3−A22W6−304−9023−20W6−303−9013−20W6−131−0−22N

SGXK35 − 1

P106 J2 / R2 RH RELAY PANEL 76550 − 02016 FOR HELICOPTERS 760250 AND SUBQ 20

P N (K M LK 22 22 21 21W6−300−9543−20B3B2B1A3A2A1X1X2W6−133−9157−24W6−147−9025−24 K7 RELAY (REF)W6−290−9533−22W6−289−9532−22 R6 / 2R E36 E35B3B2B1A3A2A1X1X2 K39 RELAY (REF) ROTOR BRAKE AUTO DUMP RELAYRB−K39−B2−A22RB−K39−A3−A22W6−300−9543−20W6−303−9546−20W6−302−0−20N

P106 J2 / 2R RH RELAY PANEL 76550 − 02004 FOR HELICOPTERS 760001 THROUGH 760249

P N M LK 23 23 24 24 W6 − 128 − 9025 − 20W6−301−9545−20W6−301−9544−20W6−132−9156−24W6−128−9025−24

TO K29 − X2RB−K39−B3−A22

(K

SPLICE EXISTING WIRE

REMOVE WIRE

DESIGNATION SYMBOL LEGEND

NEW NOTE FOR PART CALLOUT SEE REWORK INDEX FIGURE 6.



### RIGHT HAND RELAY PANEL WIRING MODIFICATIONS FIGURE 5. No. 76-66-48B

September11/07 66-50-00 Page 35 Revisio n B - July 08/09SA TD1295_3 RELAY BOX ASSY 76070 − 55207 − 041 (REF)B3B2B1A3A2A1X1X2RB002B20RB009A20

K3 FLASHER M83726 / 22 − 5000AB3B2B1A3A2A1X1X2C3C2C1D3D2D1RB009B20RB012B20RB012A20SGRB−2 (REF) RB012C20RB010A20RB008B20 RB014A20 RB008C20 SGRB − 5 (REF) RB013C20N RB009C20RB004A20 RB006D20RB006C20RB007A20

SGRB − 4 (REF) RB006B20

K1 RELAY (REF) M83536 / 6 − 022LRB001A20

E4 E3 E1

E2 E5
E6 RB002A20RB003A20RB005A20

TB1 (REF) 33776 − 44403 − 069 33776 − 44403 − 131 CR3 (REF) CR1 (REF) CR2 (REF)B3B2B1A3A2A1X1X2C3C2C1D3D2D1

K2 RELAY (REF) M83536 / 6 − 022LRB013A20N

SGRB − 6 (REF)RB012E20 SGRB − 3 (REF)RB012D20RB015A20RB016A20RB011A20RB018B20RB016C20SGRB−7 (REF)RB017A20N

GND − 1 J1 (REF) 9 10 6 8 7 5 4 11 3 2 1

1. INSTALL: M7928 / 1 − 23 2. INSTALL:

M7928 / 1 − 22 TERMINAL − 1 REQ ’ D 3. INSTALL:

MS27488 − 20 PLUG, SEAL − 1 REQ ’ D 4. INSTALL:

M39029 / 5 − 115 CONTACT SOCKET − 2 REQ ’ D REWORK INDEX

5. INSTALL:

MS27488 − 20 PLUG SEAL − 1 REQ ’ D 6. MS25274 − 2 CAP (REF) 7. MS27488 − 20 PLUG SEAL (REF) 8. INSTALL:

MS3476W10 − 6P CONNECTOR PLUG − 1 REQ ’ D M85049 / 52 − 1 − 10W STRAIN RELIEF − 1 REQ ’ D M39029 / 4 − 110 CONTACT − 6 REQ ’ D P1RB 9. MS3470W10 − 6S CONNECTOR RCPT (REF)

M85049 / 52 − 1 − 10W STRAIN RELIEF (REF) M39029 / 5 − 115 CONTACT SOCKET (REF) J1RB 10. INSTALL: MS27488 − 20 PLUG SEAL − 1 REQ ’ D 11. INSTALL: M7928 / 1 − 24 TERMINAL − 1 REQ ’ D MS27039 − 1 − 09 SCREW − 1 REQ ’ D MS35338 − 43 WASHER, LOCK − 1 REQ ’ D NAS1149F0316P WASHER, FLAT − 1 REQ ’ D NAS1149D0363J WASHER, FLAT − 1 REQ ’ D MS21044N3 NUT − 4 REQ ’ D 12. INSTALL: M81824 / 1 − 1 SPLICE − 1 REQ ’ D 13. INSTALL: M81824 / 1 − 1 SPLICE − 1 REQ ’ D (SGRB − 9) 14. INSTALL: DAMA − 15S CONNECTOR − 1 REQ ’ D D20419 − 21 SCREW, LOCK ASSY − 2 REQ ’ D DA2096 − 1 JUNCTION SHELL − 1 REQ ’ D P2RB 15. INSTALL: M81824 / 1 − 2 SPLICE − 1 REQ ’ D (SGRB − 8) 16. INSTALL: M81824 / 1 − 1 SPLICE − 1 REQ ’ D (SGRB − 11) 17. INSTALL: MS25274 − 2 CAP − 2 REQ ’ D 18. INSTALL: M81824 / 1 − 2 SPLICE − 1 REQ ’ D (SGXK7 − 2) 19. INSTALL: M81824 / 1 − 2 SPLICE − 1 REQ ’ D (SGXK39 − 1) 20. INSTALL: M39029 / 22 − 192 CONTACT SOCKET − 3 REQ ’ D 21. INSTALL: M39029 / 4 − 110 CONTACT − 1 REQ ’ D 22. INSTALL: MS27488 − 20 FILLER − 1 REQ ’ D 23. INSTALL: MS27488 − 20 PLUG SEAL − 1 REQ ’ D 24. INSTALL: M39029 / 4 − 110 CONTACT − 1 REQ ’ D 25. INSTALL: SS7048 − 4 DIODE − 1 REQ ’ DRB013B20N

SPLICE EXISTING WIRE

DESIGNATION SYMBOL LEGEND SGRB − 1 (REF)



### RELAY BOX ASSEMBLY REFERENCE ONLY SCHEMATIC FIGURE 6. No. 76-66-48B

September11/07 66-50-00 Page 36 Revisio n B - July 08/09

## WCS PRODUCT SAFETY MANAGER WORLDWIDE CUSTOMER SERVICE

,

No. 76-66-48B POWERTRAIN - Main Gear Box - Electric Rotor Brake (ERB) - One-Time Modification of

## BUSINESS REPLY MAIL

MAILSTOP: K100A WCS PRODUCT SAFETY MANAGER WORLDWIDE CUSTOMER SERVICE