This index currently holds 7 Service Bulletins and Instructions from 2 manufacturers. Every row below has been individually verified against the manufacturer's own published page or document — we never invent a record. Lycoming's own index (SSP-112-15, July 2025) lists hundreds of active SB/SL/SI numbers, and Continental's index is similar in scale; this page shows only what we have sourced so far, not a claim of complete coverage.
Service Bulletins (SB) and Service Instructions (SI) are manufacturer documents. They are not Airworthiness Directives and compliance is not required by 14 CFR 39 unless a specific AD cites the document. We hold the number, title, date and applicability for each row below from the manufacturer's own published source — we never reproduce bulletin body text, which is the manufacturer's copyrighted material.
Issued 2025-03-10
Inspection and Replacement of Part No. 652421 Nuts Used to Secure Engine Mount Legs to the Crankcase
NOT AN FAA REQUIREMENT — This is a manufacturer document. It is not an FAA Airworthiness Directive and compliance is not required by 14 CFR 39 unless an AD cites it.
Source: Continental Aerospace Technologies, retrieved 2026-08-16
Issued 2023-02-13
Crankshaft counterweights
Manufacturer's own classification: “Mandatory Service Bulletin”. The manufacturer's classification is not an FAA requirement.
NOT AN FAA REQUIREMENT — This is a manufacturer document. It is not an FAA Airworthiness Directive and compliance is not required by 14 CFR 39 unless an AD cites it.
Source: Continental Aerospace Technologies, retrieved 2026-08-16
Issued 2021-07-14
Instructions for Continued Airworthiness (ICAs) for Continental Engine Models Manufactured Under License by Rolls Royce
NOT AN FAA REQUIREMENT — This is a manufacturer document. It is not an FAA Airworthiness Directive and compliance is not required by 14 CFR 39 unless an AD cites it.
Source: Continental Aerospace Technologies, retrieved 2026-08-16
Issued 2026-07-20
Time Between Overhaul (TBO) Schedules
NOT AN FAA REQUIREMENT — This is a manufacturer document. It is not an FAA Airworthiness Directive and compliance is not required by 14 CFR 39 unless an AD cites it.
Source: Lycoming Engines, retrieved 2026-08-13
Issued 2017-05-25
Oil Servicing, Metallic Solids Identification After Oil Servicing, and Associated Corrective Action
NOT AN FAA REQUIREMENT — This is a manufacturer document. It is not an FAA Airworthiness Directive and compliance is not required by 14 CFR 39 unless an AD cites it.
Source: Lycoming Engines, retrieved 2026-08-16
Issued 2003-01-30
Crankshaft Gear Modification and Assembly Procedures
NOT AN FAA REQUIREMENT — This is a manufacturer document. It is not an FAA Airworthiness Directive and compliance is not required by 14 CFR 39 unless an AD cites it.
Source: Lycoming Engines, retrieved 2026-08-16
Issued 1997-12-01
Inspection of Crankshaft I.D. for Corrosion
NOT AN FAA REQUIREMENT — This is a manufacturer document. It is not an FAA Airworthiness Directive and compliance is not required by 14 CFR 39 unless an AD cites it.
Source: Lycoming Engines, retrieved 2026-08-16
