Page 1 of 6 ATA 63-20-01 ONE-TIME INSPECTION IMPLEMENT RECURRING INSPECTION 

# 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INFORMATION WHICH IS PROPRIETARY, IS THE PROPERTY OF SIK ORSKY AIRCRAFT CORPORATION AND/OR ITS SUBSIDIARIES, IS AN UNPUBLISHED WORK PROTECTED UNDER APPLICABLE COPYRIGHT LAWS, AND IS DELIVERED ON THE EXPRESS CONDITION THAT IT IS NOT TO BE USED, DISCLOSED, REPRODUCED, IN WHOLE OR IN PART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 FO R MANUFACTURE FOR ANYONE OTHER THAN SIKORSKY AIRCRAFT CORPORATION AND/OR ITS SUBSIDIARIES WITHOUT ITS WRITTEN CONSENT, AND THAT NO RIGHT IS GRANT ED TO DISCLOSE OR SO USE ANY INFORMATION CONTAINED HEREIN. ALL RIGHTS RESERVED. ANY ACT IN VIOLATION OF APPLICABLE LAW MAY RESULT IN CIVIL AND CR IMINAL PENALTIES. EXPORT WARNING: THESE COMMODITIES, TECHNICAL DATA OR SOFTWARE ARE SUBJECT TO THE EXPORT CONTROL OF EITHER THE INTERNATIONAL TRA FFIC IN ARMS REGULATIONS (ITAR) OR THE EXPORT ADMINISTRATION REGULATIONS (EAR) AND CANNOT BE EXPORTED WITHOUT THE AUTHORIZATION OF EITHER TH E 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 EMPLOYEE S 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 Im plement a Recurring Visual Inspection for Leakage

Section 1. PLANNING INFORMATION A. Effectivity All S-92A model helicopters wi th 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 im plement 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 l eakage is confirmed, Sikorsky Aircraft Corporation is contacted for further direct ion. 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 hour s 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

Page 2 ATA 63-20-01 IMPLEMENT RECURRING INSPECTION ONE-TIME INSPECTION 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 prepa re 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 Ai rworthiness Limitations and Inspection Requirements Manual SA-S92A-AWL-000, Chapter/ Section 5-20-00, First Flight of the Day Checklist, is issued concur rently with this ASB. (4) Temporary Revision No. 63-50, against Maintenance Manual SA-S92A-AMM-000, Chapter/Section 63-20-01, Main Transmissi on Inspection/Serviceability Checks, is issued concurrently with this ASB.ASB 92-63-032 

### S-92 ALERT Basic Issue ▪ December 22/11 

### SERVICE BULLETIN

Page 3 ATA 63-20-01 ONE-TIME INSPECTION IMPLEMENT RECURRING INSPECTION 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 ava ilable, 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

Page 4 ATA 63-20-01 IMPLEMENT RECURRING INSPECTION ONE-TIME INSPECTION Section 3. ACCOMPLISHMENT INSTRUCTIONS (Continued) (a) Using clean, low-lint cloth (A-A-59 323, 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 inch es (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 Corporat ion. Main gear box is not to be used for further flight until direction is provid ed 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

Page 5 ATA 63-20-01 ONE-TIME INSPECTION IMPLEMENT RECURRING INSPECTION 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

Page 6 ATA 63-20-01 IMPLEMENT RECURRING INSPECTION ONE-TIME INSPECTION 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 ASSEMBL Y (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

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### 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 effectiv ity 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:

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___________ ___________ ___________ ___________ ___________ ___________ 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 LeakageNo Postage Necessary


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