SCOTTISH AVIATION Bulldog MDL 120/121 — Maintenance Manual

This document details the wing spar modification for the Scottish Aviation Bulldog aircraft, specifically focusing on Modification No. BH.193. It outlines the history of the aircraft, the necessity for the modification due to fatigue damage, and the process involved in implementing the modification to extend the aircraft's service life.

• The Scottish Aviation Bulldog is a two-seat training aircraft.
• Originally designed by Beagle Aircraft in the late 1960s.
• The RAF was the largest customer, ordering 130 Bulldog T Mk 1 aircraft.
• Modification No. BH.193 strengthens the wing-to-fuselage joint.
• The modification increases the aircraft's safe fatigue life from 114 FI to 200 FI.
• The modification has been applied to only a few Bulldogs to date.
• The document describes the detailed process of the modification.
• The aircraft is undergoing an avionics upgrade post-modification.