A historical documentation collection centered on the Glenn L. Martin Model 139-WH3 Bombardment Airplane. It pairs a period manufacturer manual with separate modern informational reports prepared and checked by Sicuro Publishing.

Primary-source manual

• Maintenance Manual for the Model 139-WH3 Bombardment Airplane, issued June 1938. Its title page states that it covers aircraft numbered 775–794 and 796–814.

The supplied index samples list aircraft description and performance; special piloting instructions; powerplant specifications, ratings, fuel and oil data; wings and split flaps; empennage; fuselage; tail wheel; nacelles; landing gear; powerplant; fuel and oil systems; bomb and machine-gun installations; surface controls; electrical system; radio; instruments; inspection procedures; and appendices. The index identifies a “Curtiss Constant Speed Propeller” section at page 1014 and “Curtiss Propeller Installation” at page 1902.

Separate Sicuro Publishing reports

• Glenn L. Martin Model 139 Technical Report
• Glenn L. Martin Company Model 139: Technical Documentation, Engineering Bulletins & Performance Logs
• Martin Model 139 Technical & Performance Report

These are modern editorial reports, not original Glenn L. Martin Company publications. They present research and technical interpretations separately from the primary-source manual. Where figures differ between reports, consult each report in its own context rather than treating the figures as one definitive specification.

Publisher and historical-use notice

Sicuro Publishing is responsible for preparing and checking its reports and for the publication of this collection, including applicable permissions for material it distributes. The original manual remains a historical primary source. This collection is for historical research and reference only; it is not current approved maintenance, repair, airworthiness or operational information, and must not replace current approved documentation.