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

1 of 1
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 9dump9 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 9dump9 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

September11/07 Page 1 of 36 66-50-00

Revision B - July 08/09
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)

September11/07 Page 2 66-50-00

Revision B - July 08/09
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)

September11/07 Page 3 66-50-00

Revision B - July 08/09
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)

September11/07 Page 4 66-50-00

Revision B - July 08/09
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)

September11/07 Page 5 66-50-00

Revision B - July 08/09
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

Assy

76070-55207-105 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)

September11/07 Page 6 66-50-00

Revision B - July 08/09
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)

September11/07 Page 7 66-50-00

Revision B - July 08/09
(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)

September11/07 Page 8 66-50-00

Revision B - July 08/09
(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)

September11/07 Page 9 66-50-00

Revision B - July 08/09
(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)

September11/07 Page 10 66-50-00

Revision B - July 08/09
(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)

September11/07 Page 11 66-50-00

Revision B - July 08/09
(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)

September11/07 Page 12 66-50-00

Revision B - July 08/09
(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.

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Revision B - July 08/09
(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.

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Revision B - July 08/09
(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).

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Revision B - July 08/09
(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.

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Revision B - July 08/09
(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.

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Revision B - July 08/09
(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.

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Revision B - July 08/09
(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.

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Revision B - July 08/09
(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.

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Revision B - July 08/09
(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).

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Revision B - July 08/09
(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).

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Revision B - July 08/09
(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.

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Revision B - July 08/09
(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

Revision 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

Revision 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

Revision 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

Revision 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

Revision 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

Revision 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

Revision B - July 08/09
SA

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

Revision B - July 08/09
SA

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

Revision B - July 08/09
D

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

Revision B - July 08/09
J1 (REF)

SPLICE

EXISTING WIRE

REMOVE WIRE

REROUTE WIRE

CAP

SYMBOL DESIGNATION

LEGEND

23

22

21

13

12

11

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_1

G5521B20 G5521A20G5521C20

15

G5501D24G5500D24G5500E24

G5500C24

13

P106 (REF)

J2 / 2R (REF)

P

3

M

4

L N

5

G5523A20

8

G5524A20G5529A20NG5528A20N

5 4 11 3 1G5525A20

17

12

6 10

G5501B24

GND

DC−4

16

92 7

RELAY BOX ASSY 76070−55207−041 (REF)

G5527A20N

G5526A20N A

B

E

C

D

F

10

10

WHITE

BLACK

RED

YELLOW

BROWN

7

7

GREEN

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)

G5517A20

G5514B24

J900 (REF)

P233 (REF)

L

B

RH RELAY PANEL

76550−02004 OR 76550−02016 (REF)

8 9

14 11

11

NEW

P1RB (REF) J1RB (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.

NEG POS G5522B20

NEG POS

P1−L (REF) G55B0024

P118−G (REF)

ELECTRIC ROTOR BRAKE MODIFICATION KIT SYSTEM SCHEMATIC

FIGURE 4.

No. 76-66-48B

September11/07 66-50-00 Page 34

Revision B - July 08/09
SA

TD1295_2

W6−300−9567−20

B3

B2

B1

A3

A2

A1

X1

X2

W6−133−9157−20W6−175−9025−20W6−147−9025−20

K7 RELAY (REF)

W6−176−9156−22W6−132−9156−22

18

W6−290−9156−20W6−289−9025−20

R6 / 2R

E35 E36

SGXK17−5

B3

B2

B1

A3

A2

A1

X1

X2

K39 RELAY (REF)

ROTOR BRAKE

AUTO DUMP RELAY

RB−K39−B3−A22RB−K39−B3−B22

19

RB−K39−B2−A22RB−K39−A3−A22

W6−304−9023−20W6−303−9013−20W6−131−0−22N

SGXK35−1

P106

J2 / R2

RH RELAY PANEL 76550−02016 FOR HELICOPTERS 760250 AND SUBQ

20

P N (K M LK

22 22 21

21

W6−300−9543−20

B3

B2

B1

A3

A2

A1

X1

X2

W6−133−9157−24W6−147−9025−24

K7 RELAY (REF)

W6−290−9533−22W6−289−9532−22

R6 / 2R

E35 E36

B3

B2

B1

A3

A2

A1

X1

X2

K39 RELAY (REF)

ROTOR BRAKE

AUTO DUMP RELAY RB−K39−B2−A22 RB−K39−A3−A22 W6−300−9543−20 W6−303−9546−20

W6−302−0−20N

P106

J2 / 2R

RH RELAY PANEL 76550−02004 FOR HELICOPTERS 760001 THROUGH 760249

P N M LK

23 23 24

24

W6−128−9025−20

W6−301−9545−20W6−301−9544−20W6−132−9156−24W6−128−9025−24

TO

K29−X2

RB−K39−B3−A22

(K

SPLICE

EXISTING WIRE

REMOVE WIRE

SYMBOL DESIGNATION

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

Revision B - July 08/09
SA

TD1295_3

RELAY BOX ASSY 76070−55207−041 (REF) B3 B2 B1A3 A2 A1X1X2 RB002B20 RB009A20

K3 FLASHER

M83726 / 22−5000A

D3D2D1

C3C2C1

B3B2B1

A3A2A1

X1X2

RB009B20RB012B20 RB012A20

SGRB−2 (REF)

RB012C20

RB010A20

RB008B20

RB014A20

RB008C20

SGRB−5 (REF)

RB013C20N

RB009C20

RB004A20

RB006D20

RB006C20

RB007A20

SGRB−4 (REF)

RB006B20

K1 RELAY (REF)

M83536 / 6−022L

RB001A20

E4

E3 E1

E2

E5

E6 RB002A20

RB003A20RB005A20

TB1 (REF)

33776−44403−069

33776−44403−131

CR3 (REF) CR2 (REF) CR1 (REF)

D3D2D1

C3C2C1

B3B2B1

A3A2A1

X1X2

K2 RELAY (REF)

M83536 / 6−022L

RB013A20N

SGRB−6 (REF) RB012E20

SGRB−3 (REF)RB012D20

RB015A20RB016A20RB011A20

RB018B20RB016C20 SGRB−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’D

RB013B20N

SPLICE

EXISTING WIRE

SYMBOL DESIGNATION

LEGEND

SGRB−1 (REF)

RELAY BOX ASSEMBLY REFERENCE ONLY SCHEMATIC

FIGURE 6.

No. 76-66-48B

September11/07 66-50-00 Page 36

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No. 76-66-48B

POWERTRAIN - Main Gear Box - Electric Rotor Brake (ERB) - One-Time

Modification of
BUSINESS REPLY MAIL

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