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DEEP RESEARCH · AST/DEFENSE TURNAROUND

[AST] Defense Expansion Potential and Turnaround

A defense-growth memo through the C-390 contract, possible KAI cooperation, and MRO optionality

Published: 2025-07-25 · Aerospace/defense business analysis · Naver Blog

Investment decisions are your responsibility. This material is research and is not a buy or sell recommendation.

0. Bottom line first

I bought expecting a turnaround. The key question is whether AST can broaden its business from high civil-aircraft dependence into defense through Embraer C-390 parts, possible KAI cooperation, global defense supply chains, and MRO optionality.

1. Prior analysis and current view

This note follows the prior analysis: https://blog.naver.com/star_of_self/223940772800.

Preview image linking to the prior AST analysis post

Interpretation: The memo is less about short-term trading and more about portfolio reshaping. After the management crisis, I am watching whether AST can reduce dependence on specific civil-aircraft programs and attach itself to long-cycle defense demand.

2. Embraer C-390 contract

Official fact: The source presents the 2024 Embraer C-390 military transport core-parts supply contract, worth about KRW 74 billion, as AST's concrete defense-entry result.

The C-390 is described as expanding from Brazil, Portugal, and Hungary to NATO members such as Sweden, the Netherlands, Austria, and Czechia. For AST, the point is long-term parts growth and trust that could support other military-aircraft programs.

AST defense growth pathFrom civil-aircraft parts supplier to defense supply-chain partner
C-390KRW 74bn contract
KAIKF-21/LAH option
GlobalTier 1 credibility
MROParts and repair specialization
The success condition is repeat orders and customer diversification, not one isolated contract.

3. Three growth axes

Domestic

Stronger KAI cooperation

AST spun out of KAI in 2001 and shares technical roots in aircraft structures. Participation in KF-21 and LAH structures is the investment angle.

Global

Defense supply-chain expansion

Its Tier 1 status with Boeing, Airbus, and Embraer is a credibility asset among Korean aircraft-parts suppliers.

Long term

MRO optionality

The source cites the global military-aircraft MRO market at about KRW 57 trillion. I would watch parts supply, fuselage repair, and conversion work first.

4. Risks and checkpoints

  • Track how quickly C-390 revenue is recognized.
  • KAI-related upside is still inferential; formal contracts matter.
  • MRO is a long-term option, not an immediate earnings base.
  • As a turnaround name, financial stability and order backlog need close tracking.

Sources

Naver original