Stearman Model 4 / 6 Speedmail (Model 4C Junior Speedmail, 4D, 4E, 4EM, 6L (prewar mail/sport biplane)) — Specifications, Performance & Buyer Guide

The Stearman Model 4 / 6 Speedmail (Model 4C Junior Speedmail, 4D, 4E, 4EM, 6L (prewar mail/sport biplane)) is a single piston aircraft. This AeroTell reference page covers its specifications, performance figures, weights, typical pricing, and the applicable FAA regulatory record — Airworthiness Directives, Supplemental Type Certificates (STCs), and Special Airworthiness Information Bulletins (SAIBs) — to help pilots, owners, buyers, and A&P/IA mechanics evaluate the Stearman Model 4 / 6 Speedmail. AeroTell is a quick-reference research aid, not a compliance or airworthiness-signoff source; always verify against the official FAA record.

FAA regulatory reference for the Stearman Model 4 / 6 Speedmail family

• Stearman Model 4 / 6 Speedmail Airworthiness Directives (ADs)
• Stearman Model 4 / 6 Speedmail Supplemental Type Certificates (STCs)
• Stearman Model 4 / 6 Speedmail Special Airworthiness Information Bulletins (SAIBs)

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