PIPER J-3C — Maintenance Manual

This document discusses the gross weight increase eligibility for the Piper J-3C aircraft, detailing the necessary modifications and part specifications required for different serial numbers. It is divided into multiple parts, with the first focusing on identifying the current gross weight eligibility and the second addressing modifications needed for compliance.

• J3C aircraft can have gross weights of 1100 lb, 1170 lb, or 1220 lb depending on serial number and modifications.
• Serial numbers 7842, 7845-7883, and 7912 and up can qualify for 1220 lb gross weight with specific landing gear revisions.
• Aircraft prior to serial number 7912 can qualify for 1170 lb gross weight with certain strut revisions.
• The document references specific Piper drawings for required modifications to increase gross weight.
• Sealed struts are recommended for safety and compliance with ADs.
• The front lift strut and landing gear fittings differ between the 1100 lb and 1170 lb models.
• Modifications must be documented and approved by the FAA for certain serial numbers.
• The document is part of a series aimed at guiding owners through the gross weight increase process.