Many CIMs present “record backlog,” “sticky aftermarket,” or “defense-protected demand” without proving firm versus optional orders, platform concentration, exportability, certification runway, or free cash after rate cuts and WIP. Aerospace and defense due diligence (also called A&D, aviation, defense industry, aerospace company, defense company, aircraft, space, or military-industrial diligence) underwrites how the business designs, produces, certifies, exports, and sustains platforms and subsystems. It tests program backlog quality, aftermarket attach, dual-use mix, ITAR/export posture, platform risk, and long-cycle unit economics. It is not the same as government contracting diligence (FAR/DFARS funded backlog, recompete, set-asides, DCAA rates), manufacturing diligence (plant capacity and OEE alone), CFIUS diligence (foreign investment national-security review alone), compliance diligence (internal compliance program alone), export-control diligence as a compliance inventory alone, or commercial diligence (aggregate demand). A&D work underwrites whether the aerospace/defense industrial engine produces durable, exportable, certifiable cash through the hold period.
Aerospace/defense vs GovCon vs manufacturing vs CFIUS
| Workstream | Primary question | Typical output |
|---|---|---|
| Aerospace / defense sector DD | Is the industrial program/aftermarket engine durable? | Backlog quality bridge, platform heat map, ITAR map |
| GovCon DD | Is the public-sector contract engine bankable? | Funded backlog, contract mix, recompete, rates |
| Manufacturing DD | Is plant capacity and cost competitive? | OEE, capacity, capex, throughput |
| CFIUS DD | Does foreign investment trigger national-security review? | Jurisdiction, TID, mitigation risk |
| Compliance / export program DD | Is the control program effective? | Policies, training, license inventory |
Six pillars of aerospace & defense diligence
1. Program backlog, platform mix & customer funding
Bridge headline backlog to firm orders, options, LOIs, and IDIQ ceilings; map platforms (airframe, engine, avionics, missile, space, ground systems) and end-customer funding (DoD/allied defense budgets, civil OEMs, airlines, space operators). Flag concentration and cancelability. Align with commercial diligence, customer diligence, GovCon diligence when public-sector contracts dominate, and quality of earnings.
2. Aftermarket, MRO & installed-base economics
Installed base by platform and operator, spare/repair attach, PBH and LTSAs, OEM vs independent MRO competition, rotable inventory, and aftermarket margin quality versus OE. Connect to pricing diligence, contract diligence, and NWC diligence.
3. ITAR, export controls, clearances & FOCI
Product and technical-data classification, licenses and exemptions, foreign person access, facility clearances, FOCI mitigation, and whether growth assumes exportability that counsel cannot deliver on model timelines. Align with compliance, regulatory, CFIUS, and sanctions workstreams as needed.
4. Certification, technical data & IP durability
FAA/EASA and military qualification status, STC/PMA positions, design authority, technical data rights (government vs commercial), and dependency on primes for interface control. Connect to IP diligence, technology diligence, and product diligence.
5. Production rates, supply chain & learning curve
Rate readiness, learning-curve position, dual-source risk on critical parts, tooling and NRE remaining, quality escapes, and contribution under multi-year rate cuts. Align with manufacturing, supply-chain, logistics, and operational diligence.
6. Dual-use mix, WC, talent & long-cycle capital
Civil versus military revenue mix and correlation, WIP and inventory peaks, engineering talent and security-cleared headcount, pension/benefit overhangs where material, and capital intensity of rate ramps. Connect to people, LBO, insurance, and financial diligence.
DI20-WELCOME) — useful for backlog and aftermarket questions, ITAR/export heat maps, platform-concentration red flags, open-question lists, and data-room prioritization, not a substitute for full program audits, export counsel opinions, certification engineering reviews, or specialist technical assessments.
Stage sequencing (screen to IC)
| Stage | A&D focus | Deal-team action |
|---|---|---|
| Teaser / CIM | Backlog, aftermarket, defense story | Flag firm vs optional; platform claims |
| Desk diligence | Platform map, dual-use, export | Red/amber/green; hotspot list |
| Deep technical / legal | Program audit, ITAR, certs | Backlog bridge; export & cert map |
| IC / model | Cases for rate cut, delay, loss | Base / upside / downside with A&D cliffs |
| Post-close | Rate plan, licenses, talent | 100-day industrial plan with named owners |
Red flags
| Signal | Severity | Why it matters |
|---|---|---|
| Backlog mostly options/LOIs/IDIQ ceilings sold as firm revenue | Deal-Killer | Growth thesis not cash |
| Single platform or single prime drives majority of GM; no aftermarket offset | Deal-Killer | Program cut is enterprise risk |
| Key products not exportable / licenses expired; FOCI blocks buyer thesis | Deal-Killer | Addressable market collapses |
| Certification or qualification path incomplete for modeled growth | High | Expansion not executable |
| Aftermarket attach declining while OE rates peak | High | Thesis mis-timed to cycle |
| Critical sole-source supplier or single facility without mitigation | High | Production cliff after close |
| Cleared talent and key program managers not retained post-close | High | Execution and security risk |
| No multi-year platform P&L or firm backlog bridge pre-IC | Watch | Model and IC risk elevated |
Cost & timeline (traditional vs first-pass)
| Approach | Typical cost | Timeline | Best use |
|---|---|---|---|
| Full A&D specialist module (program, technical, export counsel) | $25K–$150K+ | 4–12 weeks | Multi-platform primes, complex ITAR, cross-border |
| Targeted backlog + top-platform / export deep-dive | $15K–$50K | 2–6 weeks | Cleaner single-platform or aftermarket-heavy assets |
| Public first-pass aerospace & defense pack | $49 | Minutes to hours | Triage before specialist spend / IC framing |
50-point aerospace & defense diligence checklist
- Top platforms / programs by revenue and gross margin
- Backlog bridge: firm orders vs options vs LOIs vs IDIQ
- Customer concentration (primes, DoD agencies, airlines, space ops)
- Civil vs military / dual-use revenue mix (3–5 years)
- Prime vs tier-1 vs tier-2 position and switching risk
- Installed base by platform and operator geography
- Aftermarket / MRO attach rates and PBH/LTSA coverage
- Aftermarket vs OE margin contribution
- OEM competition vs independent MRO dynamics
- Rotable inventory quality and obsolescence risk
- ITAR/EAR classification of products and technical data
- Active export licenses, exemptions, and pending applications
- Foreign person access controls and facility clearances
- FOCI / ownership structure implications for buyer
- CFIUS or allied foreign-investment exposure if applicable
- FAA/EASA and military qualification / certification status
- STC/PMA positions and design authority
- Government data rights vs commercial IP
- Learning-curve position and rate readiness
- Critical sole-source suppliers and dual-source plan
- Tooling, NRE remaining, and capex for rate ramp
- Quality escapes, escapes-to-field, and warranty history
- WIP and inventory peaks (long-cycle WC)
- Contract-type mix on defense work (FFP/CPFF/T&M) if material
- Recompete and program milestone calendar
- Alignment with GovCon workstream when FAR/DFARS dominate
- Engineering talent depth and cleared headcount
- Key program manager and technical lead concentration
- Retention and non-compete enforceability post-close
- Pension, union, and benefits overhangs where material
- Cyber / CMMC posture if handling CUI/CDI
- Insurance: product liability, aviation, BI, cyber
- Related-party sales to primes or affiliates
- JV / teaming agreements and deadlock history
- Litigation, bid protests, and audit findings
- Competitive set and differentiation by platform
- Synergy claims that ignore rate, export, or cert limits
- Space / satellite bus specifics if material (launch, spectrum)
- Airline / civil OEM cycle exposure
- Defense budget and allied export market exposure
- Data-room gaps on program P&Ls and license files
- Counsel workstream for export, FOCI, and contracts
- Technical SME workstream for platforms and aftermarket
- Integration impact on security culture and export compliance
- Post-close 100-day industrial plan with named owners
- IC materials: rate-cut, delay, program-loss cases
- Leverage model sensitivity to one lost platform year
- Working capital facility headroom for WIP spikes
- ESG / conflict minerals / responsible sourcing where material
- Alignment of growth thesis with realistic cert and export runway
How deal teams use a first-pass pack
Use a first-pass aerospace and defense pack to structure early questions, pressure-test CIM backlog and aftermarket language, build platform and ITAR heat maps, and prioritize data-room asks before program auditors, export counsel, and technical SMEs engage. Pair it with GovCon, manufacturing, CFIUS, compliance, financial, QoE, supply-chain, commercial, and LBO workstreams. It is an input to IC framing — not a full program audit, multi-platform technical review, or specialist export opinion.
Underwrite the industrial engine before you underwrite the backlog story
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Get a structured first-pass diligence pack — useful input for aerospace and defense thesis tests, program and aftermarket questions, ITAR/export risk, platform concentration, and IC prep, not a full specialist A&D study.
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