BUILT FOR VAN'S RV, SLING, KITFOX & E-AB BUILDERS • FAA AC 90-89C & ORDER 8130.2J COMPLIANT

You Spent 1,800 Hours Riveting Your Airframe. Don't Let a Messy Paperwork Binder Delay Your Pink Slip.

Your engine is hung, your avionics bus is pinned out, and your Designated Airworthiness Representative (DAR) inspection is 30 days away. Yet most homebuilders spend the final two weeks frantically stitching together broken forum spreadsheets, outdated AC 90-89B PDFs, and generic annual checklists that don't match their airframe's datum or Task-Based Phase I operating limitations.

Module 01 // W&B Envelope

Airframe-Specific CG Solver

Pre-calibrated datum & arm stations for RV-7/7A/8/10/14, Sling TSi & Kitfox S7 with live Aerobatic vs. Normal envelope plotting.

Module 02 // AC 90-89C

Task-Based Phase I Cards

Generates kneeboard-ready test cards for all 17 FAA AC 90-89C flight test profiles with automated V-speed & CHT/EGT trend logging.

Module 03 // 14 CFR Part 43

Condition Inspection Matrix

80+ zonal inspection checkpoints mapped to 14 CFR Part 43 Appendix D with torque specs, squawk disposition, and progress tracking.

Module 04 // Order 8130.2J

DAR & Logbook Sign-Offs

One-click verbatim logbook endorsements for Phase I completion, Repairman Certificate inspection sign-offs, and Form 8130-6 letters.

The Old Way (Why DAR Inspections Stall)

40 Hours Lost to Broken Forum Spreadsheets

✕ Mismatched Reference Datums: Copy-pasting an anonymous Excel sheet with a 60-inch datum instead of Van's 70.0-inch forward-of-leading-edge datum corrupts your entire CG envelope.
✕ Obsolete Flight Test Handbooks: Showing up with a generic 40-hour time-drill binder that ignores the FAA's updated AC 90-89C Task-Based Phase I provisions.
✕ Non-Compliant Logbook Endorsements: Missing a single mandatory phrase required by your Operating Limitations when transitioning out of Phase I or signing off your annual condition inspection.

The AeroBuild Ledger Standard

Inspection-Ready Binder in 15 Minutes

✓ Verified Airframe Templates: Select your exact model (RV-7, RV-8, RV-10, RV-14, Sling TSi, Kitfox S7) and enter your 3-wheel scale weights—empty CG and corner envelopes render immediately.
✓ Task-Based Phase I Syllabus: Every test card maps directly to AC 90-89C Chapters 1–4 with pre-flight briefings, stability/stall matrix tables, and VX/VY climb schedules.
✓ Offline Hangar Resilience: Runs in any tablet or desktop browser with local JSON snapshot persistence and clean print/PDF export for your physical aircraft binder.

Built by Flight Test Engineers & E-AB Owners

Trusted in the Hangar from First Engine Start to Annual #10

VAN'S RV-7 // LYCOMING IO-360-M1B

"My DAR spent 12 minutes reviewing my AeroBuild W&B envelope and AC 90-89C Task-Based Flight Test Binder, smiled, and said it was the cleanest amateur-built documentation package he'd inspected all year."

— Mark D., EAA Technical Counselor & RV-7 Builder (Paine Field, WA)

VAN'S RV-10 // LYCOMING IO-540

"With 4 seats and baggage compartments, computing aft CG corner cases on the RV-10 during Phase I ballast testing used to take me an hour in Excel. Here it's interactive and prints straight to my kneeboard."

— Capt. Sarah K., ATP & RV-10 Builder (Centennial, CO)

SLING TSi // ROTAX 915iS

"The 14 CFR Part 43 Appendix D Condition Inspection tracker paid for itself on my very first annual with my Repairman Certificate. Every cotter pin, control cable tension check, and logbook endorsement is right there."

— David L., Sling TSi Builder (Torrance, CA)

Zero Mandatory Subscriptions • Instant License Delivery

Simple, Builder-Friendly Pricing

Costs less than half a tank of 100LL Avgas. Saves 35+ hours of regulatory preparation.

Tier 01 // Single Airframe Starter

DAR & W&B Core Pack

$49 one-time license

Net after LemonSqueezy ($2.95 fee): $46.05 (94.0% margin)

✓ 1 Airframe W&B & CG Envelope Solver
✓ FAA Form 8130-6 Program Letter Generator
✓ Basic 40-Hour Phase I Logbook Endorsement
✓ Printable DAR Binder PDF Export

Builder Complete Suite

$79 one-time license

Net after LemonSqueezy ($4.45 fee): $74.55 (94.4% margin)

✓ Everything in Core Pack, plus:
✓ Full 17-Card AC 90-89C Task-Based Phase I Flight Test Generator
✓ Interactive 14 CFR Part 43 Appendix D Annual Condition Inspection Checklist
✓ Repairman Certificate & Phase I/II Logbook Sign-Off Builder
✓ Lifetime JSON Backup & Multi-Airframe Profiles

Tier 03 // EAA Chapter / A&P / DAR

Multi-Airframe Pro + Cloud

$99 first yr, then $29/yr

Net after LemonSqueezy ($5.45 fee): $93.55 (94.5% margin)

✓ Unlimited N-Number & Customer Aircraft Profiles
✓ Custom Datum & Arm Station Override Builder
✓ Automated Annual Inspection Due-Date Email Reminders
✓ EAA Technical Counselor Multi-Builder Review Export

Free Builder Lead Magnet • Instant Self-Audit

60-Second DAR Airworthiness Inspection Readiness Scorecard

Check off the 5 mandatory FAA Order 8130.2J & AC 90-89C items below to calculate your immediate DAR readiness score and unlock a free sample Phase I Flight Test Card PDF.

READINESS SCORE

40% (2/5)

3 Paperwork Gaps Remaining

1. Calibrated 3-Wheel Empty Weight & CG: Aircraft leveled to reference plumb line, weighed with unusable fuel & full oil, and Forward/Aft CG limits verified. 2. Permanent Data Plate & EXPERIMENTAL Placard: Fireproof stainless data plate riveted to exterior fuselage (14 CFR § 45.11) and 2" passenger warning placard installed. 3. FAA Form 8130-6 & Program Letter: Completed Application for U.S. Airworthiness Certificate + geographic Phase I test area & AC 90-89C syllabus letter. 4. Signed Condition Inspection Logbook Entry: Pre-certification condition inspection completed per 14 CFR Part 43 Appendix D scope & detail and logged in airframe book. 5. Task-Based Phase I Flight Test Cards (AC 90-89C): Kneeboard test cards prepared for Flight #1 controllability, stall/spin boundary margin, and Vx/Vy sawtooth climbs.

Frequently Asked Technical Questions

1. Does this support the FAA's Task-Based Phase I flight test program under AC 90-89C?

Yes. In addition to traditional 25-hour (certificated engine/propeller combination) and 40-hour operating limitation schedules, Module 2 generates the complete 17-task test card syllabus aligned with FAA Advisory Circular AC 90-89C and FAA Order 8130.2J so you can document each flight test objective methodically.

2. Can I customize the empty-weight CG arms if my battery or ELT is mounted in a custom location?

Absolutely. While we pre-load the exact factory reference datum and station arms for Van's RV-7/7A/8/10/14, Sling TSi, and Kitfox S7, every weight station arm (in inches aft of datum) and empty-weight moment is editable in real time.

3. Does my data stay private, and does it work offline in a metal hangar?

Yes. The entire application executes client-side in your browser with zero cloud latency, saves state locally, and allows one-click JSON file export/import plus native print/PDF binder generation.

Airframe Template

Registration (N-Number)

Builder Serial & Engine

Builder / Repairman Name

KEY: AB-RV7PRO-ACTIVE Import JSON

Loading & Station Moment Solver

Datum: 70.0 in. forward of wing leading edge | Limits: 78.40" to 86.82"

Station Item	Weight (lbs)	Arm (in)	Moment (lb-in)
Empty Aircraft (Weighed w/ Unusable Fuel & Oil)			85,897.6
Pilot (Left / Front Seat)			18,521.2
Passenger / Flight Test Ballast			17,059.0
Usable Fuel (42.0 gal @ 6.0 lbs/gal)			20,160.0
Baggage Area 1 / Tool Kit			5,705.1

Ramp / Takeoff Condition

1,750.0 lbs @ 84.20"

50.0 lbs under Max Gross

Zero-Fuel Landing Condition

1,498.0 lbs @ 84.90"

1.92" fwd of Aft Limit

Envelope Verdict

WITHIN NORMAL ENVELOPE

CG & Gross Wt Safe for Flight

Hangar Scale Calibration Tool • FAA AC 43.13-1B Ch. 10

3-Wheel Scale Empty-Weight & CG Arm Calculator

Left Main Net (lbs) Main Gear Arm (in)

Right Main Net (lbs)

Level canopy rail / longeron w/ spirit level before reading.

Tail / Nose Net (lbs) Tail / Nose Arm (in)

COMPUTED EMPTY STATE

1,088.0 lbs

CG Arm: 83.86"

Mom: 91,243.7 lb-in

Live CG vs. Gross Weight Envelope

Takeoff → Zero-Fuel Vector

Flight Test Engineering Note (AC 90-89C Ch. 1 Sec. 3):

During Phase I expansion, test both the Forward CG Limit (solo pilot, full fuel, zero baggage) and Aft CG Limit (secured lead shot ballast inspected by DAR) to verify pitch stability and elevator authority during flare.

Autonomous Cash-Flow & Unit Economics Engine

Interactive $500 to $1,000+/mo Net Profit Simulator

Fixed Infrastructure Overhead: $0.87/mo ($10.46/yr Cloudflare Domain)

MONTHLY ORGANIC VISITORS (FAA SEO + VAF/EAA Forums) 450 visitors/mo

CHECKOUT CONVERSION RATE (%) 2.2%

AVERAGE ORDER VALUE (Blended $49 / $79 / $99 Tiers) $76.00

MONTHLY SALES

10 orders

Zero manual fulfillment

GROSS REVENUE

$760.00

LemonSqueezy Fee: -$43.00

Net Monthly Cash Flow (After All Fees & Domain)

$716.13 / mo

NET MARGIN

94.2%

End-to-End Webhook Loop Verification

Test Cloudflare Worker → Supabase → Resend Pipeline

[READY] Listening on POST https://api.aerobuildledger.com/webhooks/lemonsqueezy
Click "Fire Simulated order_created Webhook" above to trace the HMAC verification, deterministic license generation, Supabase insert, and Resend email dispatch.

Autonomous Customer Acquisition • Who / What / When / Where / How

Turnkey Go-To-Market & Community Seeding Hub

Every customer acquisition channel below is pre-written in authentic peer-builder voice and coupled with automated agent triggers. Click any copy button to grab the exact post or outreach template.

Channel (WHERE)	Target Segment (WHO)	Asset / Hook (WHAT)	Cadence (WHEN)	Automation Mechanism (HOW)
1. Programmatic FAA SEO Pages	E-AB builders 30–90 days from DAR inspection	Airframe-specific CG & AC 90-89C calculators	Nightly @ 06:00 UTC	GitHub Action (`faa_registry_sync.py`) + Agent 01 & 02 auto-deploy
2. Van's AirForce (VAF) & Reddit (`r/homebuilt`)	Active RV-7/8/10/14 & Sling/Kitfox builders	Free 60-Second DAR Readiness Audit + W&B tool	Launch + Bi-Weekly	Agent 04 drafts technical threads from real AC 90-89C questions
3. EAA Technical Counselors & DARs	Inspectors reviewing 15–50 builder binders/year	Free Comped Multi-Airframe Pro License ($99 value)	5 outreach emails/wk	Resend automated sequence; DARs recommend tool to builders
4. Lead-Magnet Email Nurture	Builders who run the Free DAR Readiness Audit	5-part technical series on Phase I & Part 43 App D	Days 0, 2, 5, 9, 14	Cloudflare Worker triggers Resend 5-email drip sequence

Post 01 // Van's AirForce (VAF) & r/homebuilt Launch Post

TITLE: Built a browser-based RV-7/8/10/14 W&B Envelope + AC 90-89C Task-Based Phase I Card Generator (No Excel required)

Fellow builders — after watching too many folks wrestle with mismatched 15-year-old forum spreadsheets right before their DAR inspection, I put together an interactive, browser-based Weight & Balance CG Envelope solver and AC 90-89C Task-Based Phase I flight test card generator.

What it does out of the box:
1. Pre-loads the exact factory reference datum (e.g., 70.0" forward of wing leading edge on the RV-7/8/14, 69.0" on the RV-10) and plots your live Takeoff-to-Zero-Fuel burn vector against both the Normal and Aerobatic CG boxes.
2. Generates a 10-card kneeboard Phase I flight test syllabus mapped directly to FAA AC 90-89C (from first-flight cooling orbits to Forward/Aft CG expansion and Vx/Vy sawtooth climbs).
3. Includes a 14 CFR Part 43 Appendix D zonal Condition Inspection tracker and one-click verbatim logbook sign-offs (14 CFR 91.319(b) & Form 8130-6 Program Letter).

It runs 100% client-side in your browser (works offline on a hangar iPad) and exports clean JSON backups or print-ready PDF binders. You can run the interactive W&B calculator and 60-second DAR Readiness Scorecard for free here: https://aerobuildledger.com

Would love any feedback from fellow RV builders, Technical Counselors, or DARs on additional airframe presets to add next!

Post 02 // EAA Technical Counselor & DAR Partner Comp Email

SUBJECT: Complimentary DAR / EAA Technical Counselor License — AeroBuild Ledger (AC 90-89C & W&B Binder Tool)

Hi [Inspector/Counselor Name],

As a fellow RV-7 pilot and flight test engineer here in the Pacific Northwest, I know the #1 friction point during an Experimental Amateur-Built airworthiness inspection is walking into a hangar to find mismatched reference datums, incomplete Form 8130-6 program letters, or generic flight test plans that ignore AC 90-89C's Task-Based Phase I standards.

I built AeroBuild Ledger (https://aerobuildledger.com) so builders can generate an accurate, airframe-specific Weight & Balance CG envelope, a 10-card AC 90-89C Phase I flight test binder, and verbatim 14 CFR Part 43 Appendix D logbook sign-offs in 15 minutes.

Because EAA Technical Counselors and DARs set the standard for builder safety, I unlocked a permanent, complimentary Multi-Airframe Pro license for your chapter/inspection work:
License Key: AB-DARVIP-002026

Feel free to use it with builders you mentor or share the free 60-second DAR Pre-Inspection Readiness Scorecard with anyone scheduling an inspection over the next 90 days.

Blue skies,
Tyler Wilson
AeroBuild Ledger // RV-7 Pilot & Flight Test Quality Lead

Builder Complete Suite ($79 One-Time)