AD 2009-07-53

final rule
Data completeness: 70%

Airworthiness Directives; Sikorsky Aircraft Corporation Model S-92A Helicopters

AD Number
2009-07-53
Status
final_rule
Effective Date
Product Category
aircraft
Docket
Docket No. FAA-2009-0351
FR Citation
74 FR 18977

Applicability

TypeManufacturerModelDetails
aircraft Sikorsky Aircraft Corporation Model S-92A Airworthiness Directives; Sikorsky Aircraft Corporation Model S-92A Helicopters

Unsafe Condition

Failure of titanium studs that attach the main gearbox filter bowl assembly to the main gearbox, resulting in fretting and galling, leading to rapid loss of oil and potential main gearbox failure.

AI-generated summary from the source AD text. Verify against the official source before acting.

Required Actions

Remove all titanium studs attaching the main gearbox filter bowl assembly to the main gearbox and replace them with steel studs. Actions must be accomplished in accordance with specified portions of Sikorsky Alert Service Bulletin No. 92-63-014A, Revision A.

AI-generated summary from the source AD text. Verify against the official source before acting.

Compliance Time

Before further flight

AI-generated summary from the source AD text. Verify against the official source before acting.

Affected Aircraft

Sikorsky Aircraft Corporation Model S-92A helicopters

AI-generated summary from the source AD text. Verify against the official source before acting.

Source: Official FAA Source ↗

Retrieved: Apr 6, 2026

Rights: U.S. Government Public Domain

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2009-23-51

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Airworthiness Directives; Sikorsky Aircraft Corporation Model S-92A Helicopters

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2009-13-01

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Effective: Jul 1, 2009 Category: aircraft

2006-15-19

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Effective: Aug 16, 2006 Category: aircraft

2006-11-14

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Airworthiness Directives; Sikorsky Aircraft Corporation Model S-92A Helicopters

Unsafe Condition: could result in loss of support of the main transmission and subsequent loss of control of the helicopter.

Effective: Jun 15, 2006 Category: aircraft

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