1. PLANNING INFORMATION

A. Effectivity

All S-92A model helicopters delivered with serial numbers 920006 through 920124 including

spare main gearbox (MGB) assemblies.

Component

Filter Bowl Assembly, part number 92351-15802-101.

B. Purpose

NOTE: Spare Main Gearbox housings with zero time accrued are not required to perform

Accomplishment Instructions section B., Perform MGB stud replacement.

This Alert Service Bulletin (ASB) provides instruction to replace the existing MGB filter bowl

assembly with a new, two-piece filter bowl assembly. Instructions are also included to

replace the existing studs with new studs.

Background

Although the existing filter bowl assembly is fully compliant with all Sikorsky, FAA, EASA,

and Transport Canada requirements, in the spirit of continuous improvement, Sikorsky has

produced an improved version of the filter bowl assembly. It is more resistant to damage

and improper assembly and therefore adds margin above and beyond the current filter. It

has demonstrated significant strength and durability improvements over the existing bowl.

This new design has also been fully endorsed by the FAA.

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 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. 92-63-022A

Subject: ROTOR DRIVES - Main Module Assembly - Main Gearbox (MGB) Lube System Filter

Components - One-Time Modification of Filter Bowl Assembly

December 18/09 Page 1 of 23 63-24-02
C. Description

Helicopter is prepared for maintenance. Electrical and hydraulic power is turned off. Existing

MGB oil filter bowl assembly is accessed. Existing filter bowl assembly is removed. Existing

studs used to secure filter bowl assembly are removed (spares with zero time accrued not

required to replace studs). New studs are installed. Primary element, secondary element, double

bypass valve, pressure indicator, and packings are removed from filter bowl assembly. Primary

and secondary filter elements are inspected for damage. If damage is found, the element or

elements are replaced, as required. If damage is not found, primary and secondary filter

elements are reused in new two-piece filter bowl assembly. Filter adapter (lower half of new

two-piece filter bowl assembly) is secured to MGB housing. Primary element, secondary

element, double bypass valve, and packings are reinstalled in filter bowl (upper half of new twopiece filter bowl assembly). Filter bowl is installed onto filter adapter. Main transmission is

serviced. Ground test procedures are performed. Helicopter is returned to service.

D. Compliance

Compliance is essential. The one-time modification outlined herein is to be accomplished within

60 days from the issue date of this ASB.

E. Approval

The change effected by this document is classified as Major, and is FAA approved in

accordance with the applicable requirements of Federal Aviation Regulations FAR 29. This

modification has been approved for installation by EASA and Transport Canada. Operators

should contact their local authority prior to its implementation.

No. 92-63-022A

ROTOR DRIVES - Main Module Assembly - Main Gearbox (MGB) Lube System Filter Components - OneTime Modification of Filter Bowl Assembly

1. PLANNING INFORMATION (Continued)

December 18/09 Page 2 63-24-02
F. Manpower (Estimated)

No. of Men No. of Hours *Man-Hours

Removal of Filter Bowl

Assembly

1 1.00 1.00

Removal of Filter Bowl

Mounting Assembly Studs

1 1.50 1.50

Installation of Filter Bowl

Mounting Assembly Studs

1 1.50 1.50

Installation of New

Filter Bowl Assembly

1 2.00 2.00

Total 6.00 6.00

*Estimate does not include time required to prepare helicopter or return it to flight status.

G. Material

One-quart container (or equivalent).

H. Tooling

(1) Packing installation tool set, part number WE301K (or equivalent).

(2) Double bypass valve assembly removal/installation tool, locally fabricated (See Figure 8 for

details).

(3) Lock Ring Cutter, part number BT309 (or equivalent).

(4) Tapered Collet 1/49-28, part number CG500-4 (or equivalent).

(5) Wrench, part number R1105W (or equivalent).

(6) Lock Ring Drive Tool, part number S101D12 or M101D12N (or equivalent).

I. Weight and Balance

(1) For Filter Bowl Assembly 92351-15802-106 - Kit Number 92070-35005-011:

(a) Change in basic weight: +4.4 lbs

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ROTOR DRIVES - Main Module Assembly - Main Gearbox (MGB) Lube System Filter Components - OneTime Modification of Filter Bowl Assembly

1. PLANNING INFORMATION (Continued)

December 18/09 Page 3 63-24-02
(b) Moment arm: 357.0

(c) Change in basic moment/1000: +1.6

(2) Modification Kit Hardware 92070-35005-012: None.

J. Electrical Load Data

Not affected.

K. Software Load Data

Not applicable.

L. References

(1) Maintenance Manual, SA S92A-AMM-000, Chapter/Section 20-04-00-910-002.

(2) Maintenance Manual, SA S92A-AMM-000, Chapter/Section 54-40-01-900-001.

(3) Maintenance Manual, SA S92A-AMM-000, Chapter/Section 54-40-01-900-002.

(4) Maintenance Manual, SA S92A-AMM-000, Chapter/Section 63-20-00-610-001.

(5) Functional Check Flight Procedures Manual, SA S92A-FCP-000.

M. Publications Affected

(1) Maintenance Manual, SA S92A-AMM-000, Chapter/Section 63-24-02-900-001.

(2) Maintenance Manual, SA S92A-AMM-000, Chapter/Section 63-24-02-900-002.

N. Attachment

None.

No. 92-63-022A

ROTOR DRIVES - Main Module Assembly - Main Gearbox (MGB) Lube System Filter Components - OneTime Modification of Filter Bowl Assembly

1. PLANNING INFORMATION (Continued)

December 18/09 Page 4 63-24-02
A. Basis for Material Data

Per helicopter.

B. Bill of Material

New Part No. Qty Key Word Old Part No. Instructions/

Disposition

92070-35005-011 1 Filter Bowl

Modification Kit

(1)

consisting of:

MS14155-5 12 Washer MS14155-5

MS28774-016 1 Retainer (2)

M83248/1-016 1 Packing (2)

M83248/1-238 3 Packing M83248/1-238 (3)

NAS625-14 6 Bolt NAS625-14

SS5089-05 or,

AA9500D7127

6 Nut SS5089-05

TD399UL081Y1 1 Indicator, Press (4)

92351-15802-104 1 Filter Adaptor

92351-15802-105 1 Filter Bowl 92351-15802-101

92070-35005-012 1 MOD Kit Hardware (1)

consisting of:

DMYNO-97393-503

ALT PN

SLS11FJ101-

11SN12A - (vendor

part)

3 Stud DMYNO-97393-503

ALT PN

SLS11FJ101-

11SN12A

MS20002-4 3 Washer MS20002-4

MS51990-105P 3 Ring, Lock MS51990-105P

SS5086-04 6 Nut SS5086-04

LOCTITE 242 1 Sealant

AMS 3265 B-2, or

AC730B2

1 Sealant

MIL-P-85582 1 Primer

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ROTOR DRIVES - Main Module Assembly - Main Gearbox (MGB) Lube System Filter Components - OneTime Modification of Filter Bowl Assembly

2. MATERIAL INFORMATION

December 18/09 Page 5 63-24-02
(1) Parts and tooling are available at no cost. For parts and tooling availability and lead time

requirements, contact your Customer Service Representative at Helicopter Support, Inc

(HSI). Submit a purchase order referencing the ASB number and helicopter 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, facsimile

(FAX), or HSI website: www.HSIUS.com. For prompt shipment, reference address of each

shipping destination. Direct your order to address below.

(2) Retainer and Packing are a part of 92351-15802-105 Filter Bowl and not shown on Figure

9.

(3) Packings are part of Filter Adapter and Filter Bowl.

(4) Pressure Indicator is part of filter bowl and not shown on Figure 9.

HELICOPTER SUPPORT INC.

124 Quarry Road

P.O. Box 11068

Trumbull, Connecticut 06611 U.S.A.

Attn: Customer Service

FAX: (203) 416-4291 Telephone: (203) 416-4000

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 KEY WORD NOMENCLATURE

INSTRUCTIONS/

DISPOSITION

AS REQ’D ISOPROPYL ALCOHOL COMMERCIAL GRADE OR

EQUIVALENT

(1)

AS REQ’D Q-TIP COMMERCIAL GRADE OR

EQUIVALENT

(1)

No. 92-63-022A

ROTOR DRIVES - Main Module Assembly - Main Gearbox (MGB) Lube System Filter Components - OneTime Modification of Filter Bowl Assembly

2. MATERIAL INFORMATION

December 18/09 Page 6 63-24-02
AS REQ’D LINT FREE CLOTH CCC-C-440 OR

EQUIVALENT

(1)

AS REQ’D CLEAR EPOXY MIL-PRF-22750

OR EQUIVALENT

(2)

AS REQ’D EPOXY PRIMER MIL-P-85582, MIL-P85582C, OR EQUIVALENT(2)

AS REQ’D SEALING COMPOUND AMS 3265 TYPE 2

CHEM SEAL (CS)

5500CI CLASS B

OR EQUIVALENT

(3)

AS REQ’D SEALANT AMS3265 B-2, AC730B2,

OR EQUIVALENT

(3)

(1) Locally procure.

(2) Manufactured by Trans Chem Coatings–Industrial Finishes, Website: http://www.transchem.com/

(3) Manufactured by Flamemaster, Website: http://www.flamemaster.com/

3. ACCOMPLISHMENT INSTRUCTIONS

A. Perform one-time modification of MGB filter bowl assembly as follows:

WARNING TAKE ANY STEPS NECESSARY TO MAKE SURE THAT NO

FOREIGN OBJECTS FALL INTO THE GEARBOX DURING THE

MODIFICATION OF THE OIL FILTER ASSEMBLY.

(1) Prepare helicopter for maintenance.

(2) Turn off electrical and hydraulic power.

(3) Engage rotor brake.

NOTE: When performing the following step, do not perform step (10) of Maintenance

Manual, SA S92A-AMM-000, Chapter/Section 63-24-02-900-001.

(4) Remove MGB lube system filter (92351-15802-101). Refer to Maintenance Manual, SA

S92A-AMM-000, Chapter/Section 63-24-02-900-001.

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2. MATERIAL INFORMATION

December 18/09 Page 7 63-24-02
(5) Remove central cover (92205-04300). Refer to Maintenance Manual, SA S92A-AMM-000,

Chapter/Section 54-40-01-900-001.

NOTE: CSN 92-062 for notching of main transmission fairing for MGB filter bowl

assembly should be incorporated to facilitate filter bowl removal.

(6) Remove primary filter element (70351-38801-102) from MGB lube system filter (92351-

15802-101) and visually inspect filter element for damage as follows:

NOTE: The following criteria constitutes damage.

(a) Presence of 9wavy9 pleats - pleats should be straight and parallel with each other

(Figure 1).

(b) Presence of internal buckling - interior of filter element should be free from cracks and

buckling (Figure 2).

(c) Presence of indented dimples - dimples on filter element should extend out of the

surface rather than be pushed into the surface (Figure 3).

(7) If primary filter element (70351-38801-102) does not exhibit damage using the above

criteria, proceed to secondary filter element inspection in Step (9).

(8) If primary filter element (70351-38801-102) exhibits damage using the above criteria,

primary filter element must be discarded and replaced. Proceed to Step (9).

(9) Visually inspect secondary filter element (70351-38801-103) for damage as follows:

NOTE: The following criteria constitutes damage.

(a) Presence of 9wavy9 pleats - pleats should be straight and parallel with each other

(Figure 4).

(b) Presence of elongated cup - cup at end of element should not appear stretched or

elongated (Figure 5).

(10) If secondary filter element (70351-38801-103) does not exhibit damage using the above

criteria, proceed to Section (3)(B).

(11) If secondary filter element (70351-38801-103) exhibits damage using the above criteria,

secondary filter element must be discarded and replaced. Proceed to Section (3)(B).

No. 92-63-022A

ROTOR DRIVES - Main Module Assembly - Main Gearbox (MGB) Lube System Filter Components - OneTime Modification of Filter Bowl Assembly

3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

December 18/09 Page 8 63-24-02
B. Replace MGB Lube System Filter Assembly mounting studs as follows:

WARNING TAKE ANY STEPS NECESSARY TO ENSURE THAT NO FOREIGN

OBJECTS FALL INTO THE GEARBOX DURING THE REMOVAL AND

REPLACEMENT OF STUDS AND LOCKRINGS.

NOTE: • This procedure is to be used for removal and installation of all three Lube

System Filter Assembly studs.

• Housing must be free from damage or corrosion in order to proceed with stud

replacement.

(1) Mask MGB filter bowl inside diameter to prevent foreign objects from entering housing.

CAUTION CAUTION MUST BE USED WHEN DRILLING SO AS TO

PREVENT DAMAGE FROM DRILLING TOO DEEP.

(2) Using hand drill and lockring cutter (BT309, or equivalent), cut lockring securing studs

(SLS11FJ101-11SN12A, DMYNO-97393-503) (typical three places) as follows:

(a) Operate drill at slow speed.

(b) Drill a short way through, and stop, checking cutter depth, (just enough to cut lockring).

(c) If lockring is not cut, repeat drilling, maintaining a slow drill speed, until lockring is

either cut through, or cut enough so that it can be collapsed.

(d) Remove lockring.

CAUTION AVOID CONTACT WITH HOUSING WHEN USING REMOVAL

TOOL.

(3) Using stud tool (Stud Install Wrench, R1105W, or equivalent) wind out stud (SLS11FJ101-

11SN12A, DMYNO-97393-503) by rotating counterclockwise, (typical three places). Return

removed studs to HSI, refer to Material Information section of this ASB for shipping

information.

(4) Thoroughly clean out tapped hole using Isopropyl Alcohol (commercial grade, or

equivalent) and Q-tip (commercial grade, or equivalent), and shop air.

(5) Visually inspect tapped holes for signs of damage. If any damage to threads is detected,

stop work and contact a Sikorsky Field Service Representative, Customer Service

Manager or Customer Service engineering at 1-800-WINGED-S or 1-203-416-4299 for

assistance.

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3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

December 18/09 Page 9 63-24-02
NOTE: • Presence of serrations on entire counterbore (360°) is acceptable.

• Serrations in housing must be intact, and mating serrations of lockring must line

up exactly with serrations in housing.

• If rework of MGB housing is required, contact Sikorsky Field Service

Representative, Customer Service Manager or Customer Service engineering at

1-800-WINGED-S or 1-203-416-4299.

(6) Visually inspect housing lockring counterbore to determine suitability for installation of new

lockring.

(7) Locate serrations in MGB housing - teeth of new lockring (MS51990-105P) will be

installed in exactly the same location.

NOTE: Stud shall be installed while epoxy primer is wet.

(8) Apply epoxy primer (MIL-P-85582, MIL-P-23377, or equivalent) onto threads of new stud.

NOTE: • External spline of stud should be .010-.020-inch below mounting surface.

• Make sure new lockring teeth align with serrations in housing.

(9) Thread new stud (SLS11FJ101-11SN12A, DMYNO-97393-503) into MGB housing tapped

hole, using stud tool (Stud Install Wrench, R1105W, or equivalent).

(10) Install lockring by placing lockring over stud and onto MGB housing lockring counterbore

so that lockring internal spline aligns with stud external spline.

(11) Set lockring into MGB housing lockring counterbore using lockring drive tool (S101D12,

M101D12N, or equivalent).

(12) Clean and coat rock hard coating with clear epoxy (MIL-PRF-22750, or equivalent). Allow

to dry.

(13) Apply sealing compound (AMS 3265, Type 2, or equivalent) to lockring (MS51990-105P).

(14) Remove all squeeze-out in lockring counterbore using lint free cloth (CCC-C-440, or

equivalent).

(15) Clean any residue using Isopropyl Alcohol (commercial grade, or equivalent) and lint free

cloth (CCC-C-440, or equivalent).

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3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

December 18/09 Page 10 63-24-02
C. Perform installation of new filter bowl assembly Mod Kit (92070-35005-011) as follows (Figures

8 and 9):

(1) Remove masking from MGB filter bowl bore.

CAUTION USE CAUTION DURING FILTER ADAPTER INSTALLATION TO

AVOID DAMAGING MOUNTING STUDS.

(2) Clean studs (DMYNO-97393-503 or SLS11FJ101-11SN12A) and mating surface of MGB

housing using isopropyl alcohol (commercial grade or equivalent) and lint free cloth (CCCC-440 or equivalent).

CAUTION SEAT FILTER ADAPTER ONTO MGB HOUSING EITHER BY

HAND (PREFERRED) OR BY GRADUAL TIGHTENING OF

INSTALLATION NUTS. DO NOT DRAW FILTER ADAPTER INTO

PLACE USING ONLY ONE OR TWO NUTS AS THIS MAY CAUSE

COCKING OF THE FILTER ADAPTER, PINCHING OF THE

PACKING, OR DAMAGE TO THE FILTER BOWL ASSEMBLY.

NOTE: • In the following step, the filter adapter is installed on the MGB housing by

gradually tightening three nuts (SS5086-04) equally until filter adapter is seated

on MGB housing.

• Lubricate packings with gearbox oil prior to assembly.

(3) Using nuts (SS5086-04) and washers (MS20002-4), seat filter adaptor (92351-15802-104)

to MGB housing with weep hole at 8 o’clock position.

NOTE: In the following step make sure old nuts are properly discarded.

(4) Remove and discard nuts (SS5086-04). Save washers (MS20002-4) for reuse.

(5) Apply thread locking compound (Loctite 242) to studs (DMYNO-97393-503 or SLS11FJ101-

11SN12A).

(6) Secure filter adapter to MGB housing using three unused nuts (SS5086-04) and washers

(MS20002-4).

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3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

December 18/09 Page 11 63-24-02
WARNING THE VERIFICATION OF THE FILTER ADAPTER NUT TORQUE

VALUES IS A CRITICAL CHARACTERISTIC UNDER S-92

FLIGHT SAFETY PARTS PROGRAM.

CAUTION THE VERIFICATION OF THE INDICATED TORQUE VALUE IN

THE FOLLOWING STEP IS A CRITICAL ELEMENT OF THE

FILTER ADAPTER INSTALLATION.

CRITICAL STEP

CS

(7) (CS) Torque nut (SS5086-04) to 105-115 inch-pounds and apply torque stripe. Refer

to Maintenance Manual, SA S92A-AMM-000, Chapter/Section 20-04-00-910-002.

(8) Fillet seal perimeter of mating surfaces of filter adaptor (92351-15802-104) and MGB

housing using sealant (AMS 3265 Type 2 or equivalent).

(9) Install double bypass valve assembly (AA-C367BV-16D9A) as follows:

(a) Locally fabricate double bypass valve assembly (AA-C367BV-16D9A) removal/installation

tool (Figure 8).

(b) Using packing installation tool set, install packing (M83248/1-033) on double bypass

valve assembly (AA-C367BV-16D9A).

(c) Insert end of double bypass valve removal/installation tool (Figure 8) with smaller

diameter into double bypass valve (AA-C367BV-16D9A). Install double bypass valve

assembly (AA-C367BV-16D9A) in MGB housing by gently tapping end of double bypass

valve removal/installation tool (Figure 8) until double bypass valve is fully seated.

NOTE: Secondary filter element (70351-38801-103) includes one packing (M83248/1-

022).

(10) Make sure secondary filter element (70351-38801-103) contains one (M83248/1-022)

packing on its smaller diameter end, then install smaller diameter end of secondary filter

element (70351-38801-103) through filter adapter (92351-15802-104) and into double

bypass valve (AA-C367BV-16D9A). Push secondary filter element into double bypass valve

until it snaps into place.

No. 92-63-022A

ROTOR DRIVES - Main Module Assembly - Main Gearbox (MGB) Lube System Filter Components - OneTime Modification of Filter Bowl Assembly

3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

December 18/09 Page 12 63-24-02
NOTE: Primary filter element (70351-38801-102) includes two packings (M83248/1-134).

(11) Make sure primary filter element contains one packing (M83248/1-134) on each end.

Install primary filter element (70351-38801-102) through filter adapter (92351-15802-104)

and around secondary filter element (70351-38801-103). Push primary filter element

(70351-38801-102) into filter adapter (92351-15802-104) as far as it will go.

(12) Reset press indicator (TD399UL081Y1) button on filter bowl (92351-15802-105) as follows:

(a) Turn filter bowl (92351-15802-105) upside down.

(b) Press indicator (TD399UL081Y1) button into filter bowl (92351-15802-105).

CAUTION SEAT FILTER BOWL ONTO FILTER BOWL ADAPTER EITHER

BY HAND (PREFERRED), GRADUAL TIGHTENING OF

INSTALLATION NUTS, OR BY USING RUBBER TIP CLAMPS.

DO NOT DRAW FILTER BOWL INTO PLACE USING ONLY

ONE OR TWO NUTS AS THIS MAY CAUSE COCKING OF THE

FILTER, PINCHING OF THE PACKINGS, OR DAMAGE TO THE

FILTER BOWL ASSEMBLY.

NOTE: Filter bowl (92351-15802-105) includes two packings (M83248/1-238).

(13) If filter bowl cannot be pushed into place with hand pressure, do one of the following two

steps:

CAUTION CLAMP FACES MUST BE PADDED TO PREVENT DAMAGING

FILTER BOWL AND ADAPTER.

(a) Use suitable clamps with padded clamping surfaces and draw filter bowl (92351-12802-

105) into place by even, gradual tightening of clamps.

(b) Loosely install three equally spaced bolts (NAS625-14), washers (MS14155-5), and nuts

(SS5089-05, or AA9500D7127). Draw filter bowl (92351-12802-105) into place by even,

gradual tightening of nuts.

(14) Install filter bowl (92351-15802-105) onto filter adapter (92351-15802-104) and align filter

adapter alignment pin with either one of two adapter alignment holes in filter bowl.

NOTE: Residual oil in adapter may seep through weep hole in adapter after securing

filter bowl. Seepage of 1 - 2 drops is allowable.

(15) Secure filter bowl (92351-15802-105) to filter adapter (92351-15802-104) using bolts

(NAS625-14), washers (MS14155-5), and nuts (SS5089-05, or AA9500D7127). Torque all

six nuts to 171 - 189 inch pounds.

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3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

December 18/09 Page 13 63-24-02
(16) Reinstall central cover (92205-04300). Refer to Maintenance Manual, SA S92A-AMM-000,

Chapter/Section 54-40-01-900-002.

(17) Service main transmission. Refer to Maintenance Manual, SA S92A-AMM-000, Chapter/

Section 63-20-00-610-001.

(18) Examine components for security. Make sure area is clean and free of foreign objects.

(19) Perform ground test procedures. Refer to Functional Check Flight Procedures Manual, SA

S92A-FCP-000.

(20) Return helicopter to service.

D. Record of Compliance

(1) Make an appropriate aircraft logbook entry and component log card entry to show

compliance with this ASB.

(2) Upon compliance with this ASB, complete attached ALERT SERVICE BULLETIN

COMPLIANCE RECORD CARD and return it to Sikorsky Aircraft Corporation.

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3. ACCOMPLISHMENT INSTRUCTIONS (Continued)

December 18/09 Page 14 63-24-02
TD2021_1

SA

NOT DAMAGED

MAJOR CRUSHING 

OF PRIMARY ELEMENT

PRIMARY ELEMENT

70351-38801-102

DAMAGED

INSPECTION CRITERIA FOR PRIMARY ELEMENT (WAVY PLEATS)

FIGURE 1

No. 92-63-022A

December 18/09 Page 15 63-24-02
NOT DAMAGED

PRIMARY ELEMENT

70351-38801-102

DAMAGED

SA

TD2021_2

INSPECTION CRITERIA FOR PRIMARY ELEMENT (INTERNAL BUCKLING)

FIGURE 2

No. 92-63-022A

December 18/09 Page 16 63-24-02
TD1674_2

SA

TD2021_3

PRIMARY ELEMENT

70351-38801-102

NOT DAMAGED DAMAGED

INSPECTION CRITERIA FOR PRIMARY ELEMENT (INDENTED DIMPLES)

FIGURE 3

No. 92-63-022A

December 18/09 Page 17 63-24-02
TD2021_4

SA

NOT DAMAGED

MAJOR CRUSHING 

OF SECONDARY ELEMENT

SECONDARY ELEMENT

70351-38801-103

DAMAGED

INSPECTION CRITERIA FOR SECONDARY ELEMENT (WAVY PLEATS)

FIGURE 4

No. 92-63-022A

December 18/09 Page 18 63-24-02
TD2021_5

SA

NOT DAMAGED

UNDAMAGED CUP 

(FOR REFERENCE)

SECONDARY ELEMENT

70351-38801-103

DAMAGED

ELONGATED CUP IN

SECONDARY ELEMENT 

INSPECTION CRITERIA FOR SECONDARY ELEMENT (ELONGATED CUP)

FIGURE 5

No. 92-63-022A

December 18/09 Page 19 63-24-02
SA

TD2012

LOCKRING

STUD

STUD

REMOVAL

TOOL

LOCKRING

0.005

0.010 IN.

(SEE INSTALLATION NOTE 2)

0.010

0.020 IN.

(NOTE 1)

 1. WITH APPLICABLE WRENCH, INSTALL STUD TO

DEPTH SHOWN.

NOTE: LOCATION OF FLANGE IS IMPORTANT SO THAT

LOCKRING DRIVE TOOL WILL NOT CONTACT STUD EXTERNAL

SPLINE. ANY IMPACT OR PRESSURE ON THIS SURFACE MAY

CAUSE DAMAGE TO THREADS IN PARENT MATERIAL,

RESULTING IN A LOOSE FIT.

 2. APPLY SEALING COMPOUND (AMS3265, TYPE 2, OR EQUIVALENT)

AND WITH APPLICABLE DRIVE TOOL, INSTALL LOCKRING TO

DEPTH SHOWN.

 1.

 2.

SECURE REMOVAL TOOL OR MILL IN CHUCK AND

LOWER OVER STUD BEFORE STARTING MOTOR.

SET SPINDLE SPEED AT 300−700 RPM.

 3.

LOCKRING: WITHOUT RAISING SPINDLE,START MOTOR. 

MILL THROUGH LOCKRING, RAISING TOOL EVERY FEW

SECONDS TO ALLOW CHIPS TO CLEAR CUTTING TEETH.

BEST RESULTS WILL BE OBTAINED BY NOT MILLING

COMPLETELY THROUGH LOCKRING.

 4.

STUD: APPLY REMOVAL TORQUE TO STUD. WHEN

STUD THREAD FLANKS BEAR AGAINST LOWER

SURFACE OF LOCKRING TO BE JACKED OUT, STUD

REMOVAL MAY THUS BE COMPLETED.

IF LOCKRING HAS BEEN MILLEDCOMPLETELY

THROUGH AND DOES NOT LIFT OUT WITH STUD OR

INSERT, PORTION REMAINING MAY BE COLLAPSED

WITH A PUNCH AND REMOVED.

INSTALLATION NOTES

REMOVAL NOTES

STUD

EXTERNAL

SPLINE

GUIDE FOR REMOVAL AND INSTALLATION OF MGB FILTER BOWL ASSEMBLY MOUNTING STUD

AND LOCK-RING

FIGURE 6

No. 92-63-022A

December 18/09 Page 20 63-24-02
SA

TD2013

REMOVE:

SLS11FJ201−11SN12A

(DMYNO−97393−503) STUD (3)

MS51990−105P LOCK RING (3)

INSTALL:

SLS11FJ201−11SN12A

(DMYNO−97393−503) STUD − 3 REQ’D

MAIN HOUSING

ASSEMBLY (REF)

MS51990−105P LOCK RING (3) − 3 REQ’D

STUD AND LOCK-RING REPLACEMENT

FIGURE 7

No. 92-63-022A

December 18/09 Page 21 63-24-02
SA

 1.

TD2014

2. SYMBOLS:

DIAMETER

TRUE POSITION

PERPENDICULARITY

MICROINCH SURFACE FINISH

−X− DATUM IDENTIFIER

NOTES

ALL DIMENSIONS ARE IN INCHES

UNLESS OTHERWISE NOTED.

0.030 A B

1.50

64

−A−

B 0.010 A

8.00

1.122

1.120

R 0.125

0.03 X 45O

0.950

3. MAKE FROM NYLON OR

EQUIVALENT MATERIAL.

DOUBLE BYPASS VALVE ASSEMBLY REMOVAL/INSTALLATION TOOL

FIGURE 8

No. 92-63-022A

December 18/09 Page 22 63-24-02
 1.

 2.

SS5089−05 OR AA9500D7127

NUT − 6 REQ’D

MS14155−5 WASHER − 6 REQ’D

INSTALL:

92351−12802−105

FILTER BOWL − 1 REQ’D

INSTALL:

MS14155−5

INSTALL: WASHER − 6 REQ’D

NAS625−14

BOLT − 6 REQ’D REMOVE / REINSTALL:

70351−38801−102 FILTER

ELEMENT, PRIMARY −

1 REQ’D

REMOVE / REINSTALL:

70351−38801−103 FILTER

ELEMENT, SECONDARY −

1 REQ’D

REMOVE / REINSTALL:

AA−C367BV−16D9A

DOUBLE BYPASS VALVE

ASSEMBLY − 1 REQ’D

92351−15802−101

FILTER ASSEMBLY (1)

SS5086−04 NUT (3)

MS20002−4 WASHER (3)

INSTALL:

92351−15802−104 FILTER

ADAPTER − 1 REQ’D

SS5086−04

NUT − 3 REQ’D

92351−15802−106

FILTER ASSEMBLY (REF)

WEEP HOLE

SA

TD2015

REMOVE:

INSTALL:

M83248 / 1−134

PACKING − 2 REQ’D

M83248 / 1−022

PACKING − 1 REQ’D

(SEE NOTE 1)

(SEE NOTE 2)

NOTES

PRIMARY FILTER ELEMENT (70351−38801−102)

INCLUDES TWO PACKINGS (M83248 / 1−134).

SECONDARY FILTER ELEMENT (70351−38801−103)

INCLUDES ONE PACKING (M83248 / 1−022).

MS20002−4 WASHER − 3 REQ’D

REMOVE:

M83248 / 1−033

PACKING (1)

INSTALL:

M83248 / 1−033

PACKING − 1 REQ’D

INSTALL:

M83248 / 1−238

PACKING − 2 REQ’D

INSTALL:

M83248 / 1−238

PACKING − 1 REQ’D

(SEE NOTE 3)

(SEE NOTE 3)

 3. PACKINGS (M83248/1−238) ARE PART OF THE 

FILTER ADAPTER AND FILTER BOWL. 

MAIN GEARBOX OIL FILTER ASSEMBLY

FIGURE 9

No. 92-63-022A

December 18/09 Page 23 63-24-02
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No. 92-63-022A

ROTOR DRIVES - Main Module Assembly - Main Gearbox (MGB) Lube System

Filter Components - One-Time Modification of Filter Bowl Assembly
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