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Service Bulletin

SB 671A

Lycoming Engines

Issued
2026-09-09
Revision
A
Document type
SB
Models covered
0

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This page is a reference Record, not an airworthiness or compliance determination. Official FAA and manufacturer sources control over our restatement, subject to governing law. Check applicability, current requirements and incorporated documents before acting. The owner or operator remains responsible for airworthiness and required records under 14 CFR 91.403 and 91.417, as applicable. Terms of Use: /terms.

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SB

SB 671A

Lycoming Engines

Issued 2026-09-09

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Fuel Pump Leak Inspection and Diaphragm Replacement, Hartzell Engine Tech (HET) Alert Service Bulletin No.233

Source: Lycoming Engines, retrieved 2026-09-14 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

Bulletin document checked 2026-09-22: web page.

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We have not yet linked this bulletin to specific aircraft or engine models in our index.