AD 89-07-09

final rule
Data completeness: 70%

Airworthiness Directives; SIKORSKY AIRCRAFT Model S-61 Series Helicopters

AD Number
89-07-09
Status
final_rule
Effective Date
Product Category
aircraft
Docket
89-ASW-4
FR Citation
This information is not available.

Applicability

TypeManufacturerModelDetails
aircraft Sikorsky Aircraft Corporation S-61A Airworthiness Directives; SIKORSKY AIRCRAFT Model S-61 Series Helicopters
aircraft Sikorsky Aircraft Corporation S-61D Airworthiness Directives; SIKORSKY AIRCRAFT Model S-61 Series Helicopters
aircraft Sikorsky Aircraft Corporation S-61E Airworthiness Directives; SIKORSKY AIRCRAFT Model S-61 Series Helicopters
aircraft Sikorsky Aircraft Corporation S-61L Airworthiness Directives; SIKORSKY AIRCRAFT Model S-61 Series Helicopters
aircraft Sikorsky Aircraft Corporation S-61N Airworthiness Directives; SIKORSKY AIRCRAFT Model S-61 Series Helicopters
aircraft Sikorsky Aircraft Corporation S-61NM Airworthiness Directives; SIKORSKY AIRCRAFT Model S-61 Series Helicopters
aircraft Sikorsky Aircraft Corporation S-61R Airworthiness Directives; SIKORSKY AIRCRAFT Model S-61 Series Helicopters
aircraft Sikorsky Aircraft Corporation S-61V Airworthiness Directives; SIKORSKY AIRCRAFT Model S-61 Series Helicopters

Unsafe Condition

Failure of the main rotor gearbox helical gear Part Number S6135-20620-003 with specified serial numbers could occur.

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

Required Actions

Inspect the main rotor gearbox to identify the helical gear serial number. Replace the gear if its serial number is listed in this AD with an airworthy one having a different serial number. Ferrying is allowed under FAR Sections 21.197 and 21.199.

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

Compliance Time

within the next 100 hours' time in service

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

Affected Aircraft

Sikorsky Aircraft Corporation Model S-61A, S-61D, S-61E, S-61L, S-61N, S-61NM, S-61R, S-61V helicopters equipped with main rotor gearbox helical gear Part Number S6135-20620-003, serial numbers 1086, 1087, 1089, 1090-1099, 1101, 1103-1113, 1116, 1117, 1130, 1132.

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

Source: Official FAA Source ↗

Retrieved: Apr 8, 2026

Rights: U.S. Government Public Domain

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