0 Sikorsky 

A United Technologies Company 

Sikorsky Aircraft Corporation 

6900 Main Street P.O. Box 9729 

Stratford, Connecticut 06615-9129 

(203) 386·4000 

S-76® HEliCOPTER -

AlERT SERVICE 

BUllETIN 

NOTICE TO ALL PERSONS ECEIVI~ THIS OOCU\!fNT 

WAAJ-4·"V(;: THIS OOClJMENT. 0RANEM80DMENT OF IT l'i ANY MEDIA. OISClOSf:S 1\FOft\ fJON\'VH..CH ISPAOPFtETAAY,IS THE PROPERTVOFSir<.ORSI(Y AIRCRAFT OORPORATK>NANOIORU'S SU6SIOfAAIES,IS 

AH UM'UilUSitEOWORK PAOTECTEO USOER APPI.ICA8I.E COPYR!CtfllAWS, AN1l IS OEI.MRED ON THE ElCJ'RESS CO'<OITION THAT IT IS NOT TO BE USED, 0 SCI.DSED. REI'RODlJCfD. IN WHOlE OR IN PART ( ..O.UD M3 REPAOD\JCTIO"' AS A OERrYATM WORl<). OR USED FOR """''\JFACTURE FOR AAYOO.E OTHER THA."' S.KORSI<Y AIRCRAFT CORPOAATIC»> AA'OIOR rTS SUBS OtAA.ES WTT>IOUT rTS WRITTEN CONSENT. 

A.."OTHAT NO RIGHT IS GAANT£0 TO DSClOSE OR SOUSE AA'Y ~FORMATO'ICONTA.hEO HERE U, AuRJGHTSRESERVEO. AHv ACT 'NVIOLATJC:rfOF APPUCA&E LAW YAY RESULT NCIVI.ANO~ M . .Ml 

~~TlES 

ExPoRT WARN NG: THESE COUidODITIES, TECHN CAl. DATA OR SOFTWARE ARE SUBJECT TO THE EXPORT CO""ROl OF EITHER 1 HE INTERNATIONAL TRAFFIC .. ARMS REGUlATIONS (ITAR) OR THE EXPORT 

Ao•.t,NISTAATION REGUlATIONS (EAR) AND CMNOT BE EXPORTEOWrTHOUT THE PRIOR AUTiiORIZATIONOF ElTHER THE DEPARTMENT OF STATE OR THE DEPARTME"" OF COMMERCE. Tt<E tERM "EXPORr INClUDES ANY OISC~OSURE AND/OR PROVISION OF ACCESS TO COM•.IOOITIES, TEC II NIC~ DATA OR SOFTWARE TO OR OV FOREIGN NATION~$ (WHETHER ~OCATED IN THE UNITED S TATES OR AOROAO). THIS REOU REMENT ~SO AP~I S TO f OREIGN NATI NA~ ~OV ES OF U.S. C0MPAN ES A~O THEIR FOREIGN SUBSIOIARJES. 

S·76° 1S A REGISTERED TRADEMARK OF SIKO RSKY AIRCRAFT CORPORATION. 

ASB 76-66-50 

Basic Issue • January 14/ 13 

SUBJECT: POWERTRAIN - Main Gear Box- One Time Inspection of Main Gear Box (MGB) Lower 

Housing 

Section 1. PLANNING INFORMATION 

A. Effectivity 

B. Purpose 

ONE-TIME 

INSPECTION [ 

All S-76A, Bl and C model helicopters with the following MGB. 

Component: MGB Series: 76351-09000 series, 76351-09500 series, and 76351-

09600 series, modified by Overhaul Repair Instruction (ORI) 

numbers; 76350-065, TS-065-111 TS-065-IIA, TS-065-2, or TS-065-

2A. 

To determine if MGB lower housing has been modified by Overhaul Repair 

Instruction (ORI) number(s) listed above. If any of these ORI number(s) are 

present, perform Alert Service Bulletin (ASB). If none of these ORI number are 

present, no further action is required. 

Background: 

Investigations for loss of MGB oil pressure during flight revealed that the ORI 

repair procedure for the MGB lower housing jet bore(s) was not properly 

implemented. 

ATA 

66-10-00 l Page 1 of 18 
S-16 AlERT 

SERVICE BUllETIN 

ASB 76-66-50 

Basic Issue • January 14/13 

Section 1. PLANNING INFORMATION (Continued) 

C. Description The MGB lower housing is accessed and a visual inspection is performed using a 

flashlight and mirror to determine if ORI numbers listed in Effectivity section of this 

ASB was performed on the MGB lower housing. If the lower housing is found to 

have been repaired by ORI numbers listed in Effectivity section an inspection is 

required on all ten (1 0) lower housing jet bores for leaks, paint or caulk blistering, 

and liner protrusion. If any of these conditions are found, no further flight is allowed 

until the repair(s) is completed. 

D. Compliance Compliance is essential. The one-time inspection outlined herein shall be 

accomplished by March 31 , 2013. 

E. Approval Inspection Item. 

F. Manpower (Estimated) 

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

Inspect Jet Bore for Oil Leakage 0.2 0.2 

Inspect Jet Bore for Bubbling/Blistering of 

Caulk and Paint 

Inspect Liner for Protrusion/Movement 

Leak Check 

Total Man-Hours 

1 

1 

1 

0.2 0.2 

0.2 0.2 

0.5 0.5 

1.1 1.1 

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

Q!y 

1 

1 

1 

G. Material 

None. 

H. Tooling 

Nomenclature 

Plastic Scraper 

Inspection mirror 

Flash Light 

(1) Procure from local supply 

I. Weight and Balance 

Not affected. 

J. Electrical Load Data 

Not affected. 

Page 2 

Part No. Source 

Commercially Available or equivalent (1) 

Commercially Available or equivalent (1 ) 

Commercially Available or equivalent (1) 

[ ATA 

66-10-00 l ONE-TIME 

INSPECTION 
ASB 76-66-50 

Basic Issue • January 14/13 

S-16 AliRT 

SERVICE BUllETIN 

Section 1. PLANNING INFORMATION (Continued) 

K. Software Load Data 

None. 

L. References 

None. 

M. Publications Affected 

( 1) S-76A Model Helicopters: 

(a) Temporary Revision No. 5-189 against Airworthiness Limitations and Inspection 

Requirements Manual, SA 4047-76-2-1, Chapter/Section 5-20-00, Before First Flight 

of the Day Inspection Checklist, is issued concurrently with this ASB. 

(b) Temporary Revision No. 66-49 against Maintenance Manual, SA 4047-76-2, 

Chapter/Section 66-10-00, Main Gear Box - Inspection/Check, Before First Flight of 

the Day Inspection of the MGB Lower Housing Jet Bores, is issued concurrently with 

this ASB. 

(2) S-76B Model Helicopters: 

(a) Temporary Revision No. 5-166 against Airworthiness Limitations and Inspection 

Requirements Manual, SA 4047-76B-2-1, Chapter/Section 5-20-00, Before First 

Flight of the Day Inspection Checklist, is issued concurrently with this ASB. 

(b) Temporary Revision No. 66-23 against Maintenance Manual, SA 4047-76B-2, 

Chapter/Section 66-10-00, Main Gear Box- Inspection/Check, Before First Flight of 

the Day Inspection of the MGB Lower Housing Jet Bores, is issued concurrently with 

this ASB. 

(3) S-76C Model Helicopters: 

(a) Temporary Revision No. 5-169 against Airworthiness Limitations and Inspection 

Requirements Manual, SA 4047-76C-2-1, Chapter/Section 5-20-00, Before First 

Flight of the Day Inspection Checklist, is issued concurrently with this ASB. 

(b) Temporary Revision No. 66-26 against Maintenance Manual, SA 4047C-76-2, 

Chapter/Section 66-10-00, Main Gear Box- Inspection/Check, Before First Flight of 

the Day Inspection of the MGB Lower Housing Jet Bores, is issued concurrently with 

this ASB. 

N. Attachment 

None. 

ONE-TIME 

INSPECTION [ ATA J 66-10-00 Page 3 
S-76 AlERT 

SERVICE BUllETIN 

ASB 76-66-50 

Basic Issue • January 14/13 

Section 2. MATERIAL INFORMATION 

A. Basis for Material Data 

Per helicopter. 

B. Bill of Material 

None. 

C. Consumable Material 

Qty 

As Req'd 

As Req'd 

As Req'd 

As Req'd 

As Req'd 

As Req'd 

As Req'd 

Page 4 

WARNING I 

Nomenclature 

Acetone 

OBSERVE ALL CAUTIONS AND WARNINGS ON CONTAINERS 

WHEN USING CONSUMABLE$. 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. 

Part No. Source 

ASTM D329 ( 1) 

Ethyl Alcohol 

Dry-Cleaning Solvent 

(Alternate) A-A-53880 

(Alternate) MIL-PRF-680, Type II or 

(1) 

(2) 

Caulk 

Clear Epoxy 

Clear Polyurethane 

Cotton Cheesecloth 

Crocus Cloth 

Low-Lint cleaning Cloth 

Dow 19 

Epoxy Primer 

Epoxy Primer 

Gear box Oil 

Gear box Oil 

Gear box Oil 

Gear box Oil 

equivalent 

AMS 3265, Class B (1) 

MIL-PRF-22750 (1) 

(Alternate) MIL-PRF-85285 or ( 1) 

equivalent 

CCC-C-440 (1) 

(Alternate) A-A-1206 (1) 

{Alternate) A-A-59323, Type II or (1) 

equivalent 

MIL-M-3171 Type VI or equivalent (3) 

MIL-P-23377 (1) 

(Alternate) MIL-PRF-85582 or (1) 

equivalent 

DOD-PRF-85734 (1) 

(Alternate) MIL-L-23699 or equivalent { 1) 

(Alternate) MIL-L-21260 Type I or 

equivalent 

{Alternate) Grade 30 or equivalent 

[ 

ATA J 66-10-0~ 

{1) 

(1) 

ONE-TIME 

INSPECTION 
ASB 76-66-50 S-l& AlERT 

Basic SERVICE BUllETIN Issue • January 14/13 

Qty Nomenclature Part No. Source 

Gear box Oil (Alternate) Dexron Ill, ATF (1) 

As Req'd Matching Paint (epoxy coating) MIL-PRF-22750 (1) 

As Req'd 

As Req'd 

Paint Stripper TT-R-248 or equivalent 

Paint Stripper (Alternate) MIL-R-81294 or equivalent 

Polyurethane Paint MIL-PRF-85285, Color 17178 

( 1) Procure through local supply. 

(2) Manufactured by Safety-Kieen Systems, Inc. 5400 Legacy Drive Cluster II, Building 3 

Plano, Texas 75024 USA 1-800-669-5740 website: www.Safety-Kieen.com 

(3) Manufactured by DGR Industrial Products, Inc. 4435 North First Street, Suite #184 

Livermore, California 94551 , Phone: (408) 221 -71 22, website: www.chemicalsupermarket.com 

( 1) 

( 1) 

(1) 

Section 3. ACCOMPLISHMENT INSTRUCTIONS 

A. Prepare helicopter for inspection: 

(1) Turn off all helicopter electrical and hydraulic power. 

(2) Engage rotor brake. 

B. Perform one-time inspection to determine if the MGB lower housing was repaired per ORI 

numbers listed in Effectivity section of this ASB, and record data (after inspection is completed) 

via MGB Lower Housing Jet Bore Data Sheet: (Refer to Section H). 

NOTE: The ORI number is marked with prefix 'TS-065'. 

NOTE: If MGB lower housing has been repaired per any ORI numbers listed in Effectivity 

section of this ASB, a recurring before first flight of the day inspection will be 

implemented. Refer to Temporary Revisions listed in the Publications Affected 

Section of this ASB, to perform Before First Flight of the Day Inspection of MGB 

Lower Housing Jet Bores. 

(1) Using a flashlight and mirror, inspect nameplate area for part markings on the lower 

housing, center top, next to Accessory Drive pad. Refer to Figures 1 and 2. 

(a) If the ORI numbers cannot be read, remove paint on part marking boss 

only, See Figure 2. 

(b) Thoroughly clean area with Acetone per ASTM 0329, Ethyl Alcohol per AA-53880 or dry-cleaning solvent per MIL-PRF-680 Type II and Crocus 

Cloth per A-A-1206, Cotton Cheesecloth per CCC-C-440 or Low-Lint 

Cleaning Cloth per A-A-59323, Type II. 

(2) If part markings match any of the ORI numbers listed in Effectivity section of this ASB, 

proceed to step (3). If part markings do not match any of the ORI numbers listed in 

Effectivity section of this ASB, no further action is required. Proceed to Section E. 

ONE-TIME ( 

INSPECTION 

'---' 

ATA J 66-10-00 Page 5 
S-76 AlERT 

SERVICE BUllETIN 

ASB 76-66-50 

Basic Issue • January 14/13 

Section 3. ACCOMPLISHMENT INSTRUCTIONS (Continued) 

(3) Visually inspect all ten MGB lower housing jet bores and record data via MGB Lower 

Housing Jet Bore Data Sheet. Refer to Figures 3 and 4 for jet bore locations for the 

following inspections: 

(a) Perform a visual inspection of each jet bore for any sign of the liner protrusion 

and/or movement. Refer to Figures 5 and 6. If a jet bore liner appears to be 

backed out by any amount, remove gear box. No further flight allowed until a 

replacement gear box is installed. 

(b) Perform a visual inspection for signs of oil leakage from the jet bore. If a leak is 

present perform Section C. No further flight allowed until Section C. is performed. 

(c) Perform a visual inspection for any sign of bubbling or blistering of paint and/or 

caulking around jet bores. (Refer to Figure 8). If the paint and/or caulk is bubbling, 

blistering or cracked, perform Section C. No further flight allowed until Section C. is 

performed. 

(d) If the anomalies above are not found and paint was removed from the part marking 

area of the lower housing, proceed to Section F. If no paint was removed, proceed 

to Section G. 

C. Inspect jet bore for evidence of ORI 76350-065 liner repair as follows: 

Page 6 

(1) Remove paint and caulking on and around jet bore with plastic scraper. 

(2) Inspect for liner protrusion beyond end face of lower housing surface. 

(a) If there is any indication of liner protrusion, replace gear box. (Refer to Figure 6). 

(b) If the liner is not protruding, continue with inspection. (Refer to Figure 5). 

(3) Inspect liner parting line on end face. (Refer to Figure 5). 

(a) If oil is leaking between the ORI repaired liner and the housing, replace gear 

box. 

(b) If oil is not leaking between the ORI repaired liner and the housing, continue with 

inspection. 

TAKE PRECAUTIONARY MEASURES NOT TO 

INTRODUCE ANY FOREIGN OBJECTS INTO THE MGB 

ASSEMBLY. 

(4) Remove snap ring and jet from housing. Discard packing. 

(5) Utilizing a film of gear box oil, install new packing on jet and install jet into housing. Refer 

to Figure 7 for proper packing size and location. 

(6) Perform a minimum of a 30 minute leakage check as follows: 

[ ATA ] 

66-10-00 

ONE-TIME 

INSPECTION 
ASB 76-66-50 

Basic Issue • January 14/13 

S-76 AlERT 

SERVICE BUllETIN 

Section 3. ACCOMPLISHMENT INSTRUCTIONS (Continued) 

(a) Perform a Ground Run as follows: 

1. Operate the main rotor at 1 07% Nr flat pitch until indications are stable 

for models S-76B and later. Operate the main rotor at 1 00% Nr flat pitch 

until indications are stable for S-76A models. 

2. Ground run the MGB until all fluids have reached normal operating 

temperatures and then run for a minimum of 30 minutes. 

3. Shutdown and perform a leak check per step (6)(b) prior to return to 

service. 

(b) Visually inspect jet bores for visible moisture or droplets. 

1. If leakage occurs, recheck packing installation, repeat steps (4) and (5). 

If packing was not damaged during installation, remove and replace 

gear box. If the new packing was damaged during installation, remove 

and replace with new packing and repeat steps (4) through (6). If any 

moisture or droplets of MGB oil are visible, MGB has failed leak check. 

No further flight is allowed until MGB is replaced. 

2. If no moisture or droplets of gear box oil is visible, MGB has passed leak 

check. 

(7) If the gear box passes the leak check, touch up inspected areas as follows: 

(a) Clean surface completely with Acetone per ASTM 0329, or Ethyl Alcohol per AA-53880, or equivalent. 

(b) Apply a bead of caulk (AMS 3265 Class B) to all exposed interfaces. 

(c) Apply two (2) coats of epoxy primer (MIL-P-23377 or alternate MIL-PRF-85582 

or equivalent). 

(d) Apply two (2) coats of touch up paint (MIL-PRF 85285 Color No. 17178 or 

equivalent). 

(e) Apply two (2) coats of clear epoxy (MIL-PRF-22750 or alternate MIL-PRF-85285 

or equivalent). 

D. Any MGB lower housings that are sent for overhaul or repair that are marked with ORI part 

numbers listed in Effectivity section of this ASB, are to be repaired to ORI 76350-065 revision B 

or later, regardless of the condition of repair. Re-identify lower housing per the new ORI revision 

that was completed and obliterate old ORI 76350-065 part markings. 

E. If no paint was removed from the part marking area of the lower housing, proceed to Section G. 

F. If paint was removed from the part marking area of the lower housing, perform the following: 

ATA ] 

66-10-00 Page 7 

ONE-TIME [ 

INSPECTION 

----
S-16 ALERT 

SERVICE BUllETIN 

ASB 76-66-50 

Basic Issue • January 14/13 

Section 3. ACCOMPLISHMENT INSTRUCTIONS (Continued) 

(1) Thoroughly clean area with Paint Stripper TT -R-248 or MIL-R-81294, Acetone per ASTM 

D329, Ethyl Alcohol per A-A-53880 or dry-cleaning solvent per MIL-PRF-680 Type II and 

Crocus Cloth per A-A-1206, Cotton Cheesecloth per CCC-C-440 or Low-Lint Cleaning 

Cloth per A-A-59323, Type II. 

NOTE: DOW 19 is to be applied per MIL-M-3171 Type VI. Refer to Material 

Information section of this ASB. 

(2) Apply DOW 19 coating (or equivalent) with brush to any bare magnesium surfaces to 

produce a brassy finish. 

(3) Apply two (2) coats of epoxy primer (MIL-P-23377 or alternate MIL-PRF-85582 or 

equivalent). 

(4) Apply two (2) coats of touch up paint (MIL-PRF-85285 Color No. 17178 or equivalent). 

(5) Apply two (2) coats of clear epoxy (MIL-PRF-22750 or alternate MIL-PRF-85285 or 

equivalent). 

(6) Proceed to Section G. 

G. Helicopter is returned to service. 

Page 8 [ 

ATA J 

?6-10-00 

ONE-TIME 

INSPECTION 
ASB 76-66-50 

Basic Issue • January 14/13 

Section 3. ACCOMPLISHMENT INSTRUCTIONS (Continued) 

H. MGB Lower Housing Jet Bore Data Sheet. 

S-76 ALERT 

SERVICE BUllETIN 

(1) Send this MGB Lower Housing Jet Bore Data Sheet, completed, via email to: 

GPSIKSASProductSafet@utc.com or facsimile to: (860) 998-7565. 

(2) Record the following information for each helicopter: 

Customer/Operator Name: -----------------------

Helicopter Serial Number: ------------------------

Helicopter Total Time Since New: ---------------- - ----

Time Since Last Overhaul: ------------------------

MGB Part Number: ---------------------- ----

MGB Serial Number: ------------------ -------

Lower Housing Part Number: ------------ ------ -----

Lower Housing ORI Part Number (TS-065-XX): ------------ -----

Lower Housing Serial Number: ---- - ----- - ----- - -----

Any Sign of Liner Protrusion and/or Movement? YES ------ NO _____ _ 

Signs of Oil Leakage from any Jet Bore? YES _____ _ _ NO _ _ _ ____ _ 

Signs of Bubbling or Blistering Paint and/or Caulking around any Jet Bores? YES _ _ NO __ 

Date Inspection is Performed: ----- ------- ------ ----

ONE-TIME 

INSPECTION [ ATA J 66-10-00 Page 9 
S-76 AURT 

SERVICE BUllETIN 

Section 3. ACCOMPLISHMENT INSTRUCTIONS (Continued) 

PART MARKING 

Page 10 

PART MARKING 

(SEE FIGURE 2) 

JET LOCATION 

R.H.SHOWN 

L.H. OPPOSITE 

(REF) 

PART MARKING BOSS LOCATION 

FIGURE 1 

[ 

ASB 76-66-50 

Basic Issue • January 14/13 

ACCESSORY DRIVE PAD 

VIEW A-A 

ATA ) 

66-10-00 

TD2975 .. 

ONE-TIME 

INSPECTION 
ASS 76-66-50 

Basic Issue • January 14/13 

Section 3. ACCOMPLISHMENT INSTRUCTIONS (Continued) 

ONE-TIME [ 

INSPECTION 

'-----' 

REMOVE PAINT IN THIS 

AREA TO FIND PART MARKING 

PART MARKING AREA ON LOWER HOUSING 

FIGURE 2 

ATA ] 

66-10-00 

S-16 AURT 

SERVICE BUllETIN 

TD2976 ... 

Page 11 
S-16 AlERT 

SERVICE BULLETIN 

Section 3. ACCOMPLISHMENT INSTRUCTIONS (Continued) 

GENERATOR 

GEAR JET BORE 

FREE WHEEL UNIT (FWD) 

ROLLER BRG JET BORE 

SPUR GEAR 

JET BORE 

ASS 76-66-50 

Basic Issue • January 14/13 

BEVEL GEAR 

JET BORE 

TD2977 

Page 12 

JET BORE LOCATIONS, RIGHT SIDE (LH SIDE IS OPPOSITE OF WHAT IS SHOWN) 

FIGURE 3 

[ ATA ) 

66-10-00 

ONE-TIME 

INSPECTION 

.. 
ASS 76-66-50 

Basic Issue • January 14/13 

Section 3. ACCOMPLISHMENT INSTRUCTIONS (Continued) 

ONE-TIME 

INSPECTION 

LEFT 

[ 

GENERATOR 

GEAR JET 

SPUR 

GEAR JET 

BEVEL 

GEAR JET 

FREE WHEEL 

UNIT JET 

FREEWHEEL 

UNIT(FWO) 

ROLLER 

BRG JET 

SPUR 

GEAR JET 

BEVEL 

GEAR JET 

FREEWHEEL 

UNIT(FWO) 

ROLLER 

BRG JET ----iii== 

LOCATIONS OF JET BORES, BOTH SIDES 

FIGURE 4 

ATA ] 

66-10-00 

S-76 AURT 

SERVICE BUlLETIN 

RIGHT 

TD2978 ... 

Page 13 
S-16 AlERT 

SERVICE BUllETIN 

Section 3. ACCOMPLISHMENT INSTRUCTIONS (Continued) 

Page 14 

LOWER 

HOUSING 

OIL JET 

OIL JET CROSS SECTIONAL VIEW 

JET BORE LINER 

FIGURE 5 

ASS 76-66-50 

Basic Issue • January 14/13 

THE PARTING LINE IS THE INTERFACE 

BETWEEN THE LINER AND THE HOUSING 

JET BORE LINER INSTALLED CORRECTLY: 

FLUSH TO 0.010 IN. BELOW HOUSING 

[ ATA J 

66-10-00 

TD2979 $A 

ONE-TIME 

INSPECTION 
ASS 76-66-50 

Basic Issue • January 14/13 

Section 3. ACCOMPLISHMENT INSTRUCTIONS (Continued) 

ONE-TIME 

INSPECTION [ 

LOWER 

HOUSING 

OIL JET CROSS SECTIONAL VIEW 

EXAMPLE OF A JET BORE LINER BACKED OUT 

FIGURE 6 

ATA ] 

66-10-00 

S-76 AURT 

SERVICE BUllETIN 

JET BORE LINER 

PROTRUSION 

TD2980 

"' 

Page 15 
S-76 ALERT 

SERVICE BUlLETIN 

ASS 76-66-50 

Basic Issue · January 14/13 

Section 3. 

Page 16 

ACCOMPLISHMENT INSTRUCTIONS (Continued) 

OUTBOARD PACKING 

(LARGER DIAMETER) 

LOCATION INBOARD PACKING OUTBOARD PACKING 

(SEE FIGURE 4) (SMALLER DIAMETER) (LARGER DIAMETER) 

GENERATOR GEAR M83248 / 1-o13 M83248 / 1-016 

SPUR GEAR M83248 / 1-133 M83248/ 1-22& 

BEVEL GEAR M83248 / 1-137 M83248 / 1-232 

FREE WHEEL UNIT (FWU) JET M83248 / 1-011 M83248 /1 -016 

FREE WHEEL UNIT (FWU) M83248/ 1-o14 M83248 / 1-016 

ROUER BRG JET 

PACKING LOCATIONS ON TYPICAL JET BORE 

FIGURE 7 

[ ATA 

66-10-00 l ONE-TIME 

INSPECTION 
ASB 76-66-50 

Basic Issue • January 14/13 

Section 3. ACCOMPLISHMENT INSTRUCTIONS (Continued) 

ONE-TIME 

INSPECTION [ 

ATA J 66-10-00 

OIL JET CROSS SECTION VIEW 

INSPECTION AREA 

FIGURE 8 

S-76 ALERT 

SERVICE BUllETIN 

INSPECTlON AREA FOR 

BUBBUNG OR BUSTERING 

OF PAINT I CAULKING 

T02989 .... 

Page 17 
S-76 AlERT 

SERVICE BUllETIN 

ASB 76-66-50 

Basic Issue • January 14/13 

Section 3. ACCOMPLISHMENT INSTRUCTIONS (Continued) 

I. Record of compliance: 

Page 18 

(1) Make helicopter logbook entries to show compliance with this ASB as follows: 

(a) Make helicopter level logbook entry on form SA7343-15. 

(b) When ASB modifies a component that can be removed from this helicopter: 

1. Make component log card entries on forms SA7343-22 & SA7343-21 as 

applicable. 

2. If a component modified by this ASB does not have a log card and the ASB 

does not create one, then annotate compliance on the next higher assembly 

that the component belongs to which does have a log card. 

NOTE: If access to www.Sikorsky360.com is unavailable, complete attached ALERT 

SERVICE BULLETIN COMPLIANCE RECORD CARD and return it to Sikorsky 

Aircraft Corporation. 

(2) Make an appropriate electronic compliance entry in the E-Notification section at 

www.Sikorsky360.com. Refer to User Guide located on the www.Sikorsky360.com/ENotification Search page. 

[ ATA ] 66-10-00 

ONE-TIME 

INSPECTION