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S-92 ALERT 

SERVICE BULLETIN 

WARNING: THIS DOCUMENT, OR AN EMBODIMENT OF IT IN ANY MEDIA, DISCLOSES INFORMATION WHICH IS PROPRIETARY, IS THE PROPERTY OF SIKORSKY AIRCRAFT 

CORPORATION AND/OR ITS SUBSIDIARIES, IS AN UNPUBLISHED WORK PROTECTED UNDER APPLICABLE COPYRIGHT LAWS, AND IS DELIVERED ON THE EXPRESS CONDITION 

THAT IT IS NOT TO BE USED, DISCLOSED, REPRODUCED, IN WHOLE OR IN PART (INCLUDING REPRODUCTION AS A DERIVATIVE WORK), OR USED FOR MANUFACTURE FOR 

ANYONE OTHER THAN SIKORSKY AIRCRAFT CORPORATION AND/OR ITS SUBSIDIARIES WITHOUT ITS WRITTEN CONSENT, AND THAT NO RIGHT IS GRANTED TO DISCLOSE OR 

SO USE ANY INFORMATION CONTAINED HEREIN. ALL RIGHTS RESERVED. ANY ACT IN VIOLATION OF APPLICABLE LAW MAY RESULT IN CIVIL AND CRIMINAL PENALTIES. 

EXPORT WARNING: THESE COMMODITIES, TECHNICAL DATA OR SOFTWARE ARE SUBJECT TO THE EXPORT CONTROL OF EITHER THE INTERNATIONAL TRAFFIC IN ARMS 

REGULATIONS (ITAR) OR THE EXPORT ADMINISTRATION REGULATIONS (EAR) AND CANNOT BE EXPORTED WITHOUT THE AUTHORIZATION OF EITHER THE DEPARTMENT OF 

STATE OR THE DEPARTMENT OF COMMERCE PRIOR TO EXPORT. EXPORT INCLUDES DISCLOSURE AND OR ACCESS TO COMMODITIES, TECHNICAL DATA OR SOFTWARE BY 

FOREIGN NATIONALS WHETHER LOCATED IN THE UNITED STATES OR ABROAD. THIS REQUIREMENT APPLIES EQUALLY TO FOREIGN NATIONAL EMPLOYEES OF U.S. 

COMPANIES AND THEIR FOREIGN SUBSIDIARIES. 

ASB 92-63-032 

Basic Issue ▪ December 22/11 

SUBJECT: ROTOR DRIVES – Main Gear Box – Main Module Assembly – Perform a One-Time 

Enhanced Visual Inspection for Leakage and Implement a Recurring Visual Inspection for 

Leakage 

Section 1. PLANNING INFORMATION 

A. Effectivity All S-92A model helicopters with serial numbers 920006 through 920155. 

B. Purpose To perform a one-time enhanced visual inspection of the Main Gear Box (MGB) for 

leakage, and to provide instructions to implement a recurring visual inspection of 

the MGB. 

C. Description The MGB housing in the cored passage area adjacent to the scissor bracket 

mount is visually inspected for indications of oil leakage. If indications of oil 

leakage are found, the area is cleaned, a ground run is performed and the area is 

reinspected to confirm the leakage. If leakage is confirmed, Sikorsky Aircraft 

Corporation is contacted for further direction. If no indications of housing leakage 

are found, the helicopter is returned to service. 

A recurring visual inspection of the same area is implemented in accordance with 

the Temporary Revisions listed in Section M., Publications affected. 

D. Compliance Compliance is essential. The one-time enhanced visual inspection outlined herein 

shall be accomplished within 10 flight hours or 15 days from the issue date of this 

Alert Service Bulletin (ASB), whichever occurs first. 

The implementation of the recurring visual inspection shall be accomplished 

subsequent to the one-time enhanced visual inspection. 

E. Approval Inspection item. 

Sikorsky Aircraft Corporation

6900 Main Street P.O. Box 9729 

Stratford, Connecticut 06615-9129 

(203) 386-4000
S-92 ALERT ASB 92-63-032 

SERVICE BULLETIN Basic Issue ▪ December 22/11 

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Section 1. PLANNING lNFORMATION (Continued) 

F. Manpower (Estimated) 

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

Perform one-time enhanced visual 

inspection 1 1.0 1.0

Total Man-Hours 1.0 

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

G. Material 

None. 

H. Tooling 

(1) 10X Magnifying glass (commercially available, or equivalent). 

(2) Ultraviolet (black) light (Magnaflux ZB-100F, or equivalent). 

I. Weight and Balance 

Not affected. 

J. Electrical Load Data 

Not affected. 

K. Software Load Data 

Not changed. 

L. References 

None. 

M. Publications Affected 

(1) Airworthiness Limitations and Inspection Requirements Manual SA-S92A-AWL-000, 

Chapter/Section 5-20-00. 

(2) Maintenance Manual SA S92A-AMM-000, Chapter/Section 63-20-01. 

(3) Temporary Revision No. 5-104, against Airworthiness Limitations and Inspection 

Requirements Manual SA-S92A-AWL-000, Chapter/Section 5-20-00, First Flight of the Day 

Checklist, is issued concurrently with this ASB. 

(4) Temporary Revision No. 63-50, against Maintenance Manual SA-S92A-AMM-000, 

Chapter/Section 63-20-01, Main Transmission Inspection/Serviceability Checks, is issued 

concurrently with this ASB. 
ASB 92-63-032 S-92 ALERT

Basic Issue ▪ December 22/11 SERVICE BULLETIN

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Section 1. PLANNING INFORMATION (Continued) 

N. Attachment 

None. 

Section 2. MATERIAL INFORMATION 

A. Basis for Material Data 

Per helicopter. 

B. Bill of Material 

None. 

C. Consumable Material 

Qty Nomenclature Part No. Source

As Req’d Low-Lint Cloth A-A-59323, Type II or equivalent (1) 

As Req’d Degreasing Solvent MIL-PRF-680 or equivalent (1) 

(1) Available through local supply channels. 

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 enhanced visual inspection as follows: 

(1) Using 10X magnifying glass (commercially available, or equivalent), visually inspect main 

gear box in location shown in Figure 1 for indication of oil leakage. 

(2) If any indications of oil leakage are found, proceed as follows: 

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. 
S-92 ALERT ASB 92-63-032 

SERVICE BULLETIN Basic Issue ▪ December 22/11 

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Section 3. ACCOMPLISHMENT INSTRUCTIONS (Continued) 

(a) Using clean, low-lint cloth (A-A-59323, Type II, or equivalent) moistened with 

degreasing solvent (MIL-PRF-680, or equivalent), wipe area clean. 

(b) Perform ground run to confirm source of leakage. 

NOTE: • Inspection is to be performed with an ultraviolet (black) light (Magnaflux 

ZB-100F, or equivalent) that has a minimum intensity of 1000 microwatts 

per square centimeter, measured 15 inches (38.1 cm) from the front of the 

bulb or filter, and has a wavelength within the range of 320 to 400 

nanometers. 

• Oil leakage indications are enhanced when the amount of ambient white 

light is lowered. To improve the visibility of oil leaks on the housing, it is 

recommended to perform the ultraviolet (“black” light) inspection with the 

minimal amount of ambient white light. 

(c) Repeat visual inspection with 10X magnifying glass (commercially available, or 

equivalent) and ultraviolet (black) light (Magnaflux ZB-100F, or equivalent). 

1. If housing leakage is confirmed, photo document the findings and send 

information to Sikorsky Aircraft Corporation. Main gear box is not to be used for 

further flight until direction is provided by Sikorsky. Contact Sikorsky at 1-800-

WINGED-S or (203) 416-4299 for further direction. 

2. If housing leakage is not confirmed, proceed to step (4). 

(3) If no indications of oil leakage are found, proceed to step (4). 

(4) Return helicopter to service. 

C. Implement recurring enhanced visual inspection as follows: 

(1) Review and comply with Temporary Revisions listed in Section M, Publication Affected, of 

this ASB. 

MAIN GEAR BOX IS NOT TO BE USED FOR 

FURTHER FLIGHT UNTIL DIRECTION IS PROVIDED 

BY SIKORSKY AIRCRAFT CORPORATION. 
ASB 92-63-032 S-92 ALERT

Basic Issue ▪ December 22/11 SERVICE BULLETIN

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Section 3. ACCOMPLISHMENT INSTRUCTIONS (Continued) 

D. Record of compliance: 

(1) Make an appropriate helicopter logbook or component log card entry to show compliance 

with this ASB. 

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. 

 
S-92 ALERT ASB 92-63-032 

SERVICE BULLETIN Basic Issue ▪ December 22/11 

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MAIN GEAR BOX INSPECTION AREA 

MAIN GEAR BOX INSPECTION AREA 

FIGURE 1 

SA

TD2660_1

STATIONARY

SCISSORS (REF)

INSPECTION AREA

(SEE VIEW A)

MAIN MODULE 

ASSEMBLY (REF)

SA

TD2660_2

VIEW A

INSPECT LEE PLUG BOSS,

CORED PASSAGES AND 

ADJACENT SURFACES.

VIEW A

MAIN MODULE HOUSING (REF)
(Fold over and tape closed) 

SIKORSKY AIRCRAFT CORPORATION 

FACSIMILE NUMBER (860) 998-7565 

EMAIL ADDRESS: GPSIKSASProductSafet@utc.com 

ATTENTION: SAS PRODUCT SAFETY MANAGER 

SIKORSKY AEROSPACE SERVICES 

(Fold Up to Arrows)

IMPORTANT NOTICE 

Upon COMPLIANCE with the attached ASB, Sikorsky requests your cooperation in completing and 

returning this ENTIRE PAGE by MAIL, FAX, or scan & EMAIL. 

If you have internet access, you may go to www.sikorsky.com to record your compliance. 

Please fill in the requested information at the bottom of the page, so we may maintain 

proper records documenting the configuration of your aircraft. This information is useful 

when determining configuration and effectivity of issues affecting fielded aircraft. 

This request is in keeping with our policy to assure that our customers receive the latest 

information applicable for the maintenance of your aircraft. Thank you. 

ALERT SERVICE BULLETIN: ________________ Compliance Record Card 

TITLE: ___________________________________________________________________ 

 ___________________________________________________________________ 

 ___________________________________________________________________ 

OWNER/OPERATOR: _____________________________________________________ 

SUBMITTED BY: ___________________________ DATE: ____________________ 

FOLLOWING SERIAL NUMBERS ARE NOT AFFECTED BY THIS ASB 

ASB HAS BEEN COMPLIED WITH ON THE FOLLOWING SERIAL NUMBERS 

 ___________ ___________ ___________ ___________ ___________ ___________ 

 ___________ ___________ ___________ ___________ ___________ ___________ 

ASB No. 92-63-032 

ROTOR DRIVES – Main Gear Box – Main Module Assembly – Perform a OneTime Enhanced Visual Inspection for Leakage and Implement a Recurring Visual 

Inspection for Leakage 
No Postage 

Necessary 

BUSINESS REPLY MAIL 

FIRST-CLASS MAIL PERMIT NO. 432 BRIDGEPORT CT 

POSTAGE WILL BE PAID BY ADDRESSEE 

SIKORSKY AIRCRAFT CORPORATION

P.O. BOX 9729 

6900 MAIN STREET 

STRATFORD, CONNECTICUT 06615-9129 U.S.A.

MAILSTOP: S328A

ATTENTION: SAS PRODUCT SAFETY MANAGER 

 SIKORSKY AEROSPACE SERVICES 

Please complete the form on the reverse side and FAX to 

FACSIMILE NUMBER (860) 998-7565 

Or scan and email to: 

EMAIL ADDRESS: GPSIKSASProductSafet@utc.com 

or fold and return ENTIRE form to Sikorsky Aircraft Corporation