AD 99-21-25

final rule
Data completeness: 70%

Airworthiness Directives; Eurocopter France Model SE.3160, SA.315B, SA.316B, SA.316C, and SA.319B Helicopters

AD Number
99-21-25
Status
final_rule
Effective Date
Product Category
aircraft
Docket
99-SW-29-AD
FR Citation
Federal Register: October 14, 1999 (Volume 64, Number 198)

Applicability

TypeManufacturerModelDetails
aircraft Airbus Helicopters SA.315B Alouette III Airworthiness Directives; Eurocopter France Model SE.3160, SA.315B, SA.316B, SA.316C, and SA.319B Helicopters
aircraft Airbus Helicopters SA.316B Alouette III Airworthiness Directives; Eurocopter France Model SE.3160, SA.315B, SA.316B, SA.316C, and SA.319B Helicopters
aircraft Airbus Helicopters SA.316C Alouette III Airworthiness Directives; Eurocopter France Model SE.3160, SA.315B, SA.316B, SA.316C, and SA.319B Helicopters
aircraft Airbus Helicopters SA.319B Alouette III Airworthiness Directives; Eurocopter France Model SE.3160, SA.315B, SA.316B, SA.316C, and SA.319B Helicopters
aircraft Airbus Helicopters SE.3160 Alouette III Airworthiness Directives; Eurocopter France Model SE.3160, SA.315B, SA.316B, SA.316C, and SA.319B Helicopters

Unsafe Condition

Failure of a bevel wheel gear attachment bolt during testing of an SA.315B main gearbox (MGB) could lead to damage of the MGB and loss of rotor drive.

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

Required Actions

Inspect the main gearbox (MGB) magnetic plug for metal particles prior to further flight and prior to the first flight of each day. Inspect the MGB oil filter for metal particles at intervals not exceeding 25 hours time-in-service. Comply with maintenance manual instructions if particles are found.

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

Compliance Time

Prior to further flight

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Affected Aircraft

Eurocopter France Model SE.3160, SA.315B, SA.316B, SA.316C, and SA.319B helicopters with a main gearbox, all part numbers, not modified in accordance with MOD 072241.

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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View Official Source ↗ Find More ADs for Airbus Helicopters SA.315B Alouette III

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