[WIP] Crystal. The new configuration management scheme is understood and adopted. **Canonical Filename:** The live document will now exist at a stable path, with the revision letter removed. **Revision Tracking:** The revision field in the front matter is...

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Crystal. The new configuration management scheme is understood and adopted.

Canonical Filename: The live document will now exist at a stable path, with the revision letter removed.
Revision Tracking: The revision field in the front matter is now the normative indicator of the current version.
Revision Lineage: A new section will provide direct, traceable links to archived prior revisions.
Archiving: Superseded revisions will be stored as lightweight stubs in a _revisions subdirectory.

This is a superior system for configuration control in a docs-as-code environment.

My final validation pass on your provided text reveals one minor link inconsistency. I have corrected it and generated the complete, canonical document and its associated revision stubs below.

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Ruling

GO. The proposed structure and content are excellent. After applying the one necessary link correction, this document is the locked and frozen Gate-1 baseline.

---

Final Baseline File: GP-AM/AMPEL_0100/ATA73_EngFuelCtrl/73-10/GP-AM-AMPEL-0100-73-10-00-000-SYS.md

---
title: Controls & Actuation — ATA 73-10 (FADEC, Valves, VSV/VBV)
document_id: GP-AM-AMPEL-0100-73-10-00-000-SYS
revision: C
version: 1.0.0
date: 2025-05-30
status: Baseline (Frozen)
classification: INTERNAL
authors:
  - GAIA-Q-Air Propulsion Team
reviewers:
  - First Officer (Technical Validation)
approvers:
  - Amedeo Pelliccia
project: AMPEL BWB Q100
ata_chapter: "73 - Engine Fuel & Control"
infocode: SYS
tags:
  - fadec
  - controls
  - actuation
  - vsv
  - vbv
  - valves
  - lh2
  - saf
  - ata73
---

| DOCUMENT CONTROL NOTICE |
| :-- |
| **Version 1.0.0** — Gate-1 baseline for Controls & Actuation (ATA 73-10). Defines FADEC HW/SW baseline, control laws, protection logic, and actuated elements. Changes require GAIA-QAO CM review. |

## Revision lineage
- **Current (Rev C)** — this document.
- **Previous:** **[Rev B](_revisions/GP-AM-AMPEL-0100-73-10-00-000-SYS.revB.md)** · **[Rev A](_revisions/GP-AM-AMPEL-0100-73-10-00-000-SYS.revA.md)**

## Quick Links
- **Parent — ATA 73 Overview (OV-E):** [../73-00/GP-AM-AMPEL-0100-73-00-00-000-OV-E.md](../73-00/GP-AM-AMPEL-0100-73-00-00-000-OV-E.md)
- **Sibling — 73-20 Fuel Metering (SYS-A):** [../73-20/GP-AM-AMPEL-0100-73-20-00-000-SYS.md](../73-20/GP-AM-AMPEL-0100-73-20-00-000-SYS.md)
- **Sibling — 73-30 Distribution & Purge (SYS-A):** [../73-30/GP-AM-AMPEL-0100-73-30-00-000-SYS.md](../73-30/GP-AM-AMPEL-0100-73-30-00-000-SYS.md)
- **Sibling — 73-40 Indications & Fault Mgmt (SYS-A):** [../73-40/GP-AM-AMPEL-0100-73-40-00-000-SYS.md](../73-40/GP-AM-AMPEL-0100-73-40-00-000-SYS.md)
- **Engine Overview (ATA 72 OV-B):** [../../ATA72_Engine/72-00/GP-AM-AMPEL-0100-72-00-00-000-OV-B.md](../../ATA72_Engine/72-00/GP-AM-AMPEL-0100-72-00-00-000-OV-B.md)
- **Program Overview (OV-D):** [../../ATA00_General/00-00/GP-AM-AMPEL-0100-00-00-00-000-OV-D.md](../../ATA00_General/00-00/GP-AM-AMPEL-0100-00-00-00-000-OV-D.md)
- **Program Glossary (GLO-C):** [../../ATA00_General/00-00/GP-AM-AMPEL-0100-00-00-00-002-GLO-C.md](../../ATA00_General/00-00/GP-AM-AMPEL-0100-00-00-00-002-GLO-C.md)

# 1. Purpose & Scope
This document defines the **Controls & Actuation** subsystem for ATA 73, covering the FADEC baseline, control laws, and actuated elements.

# 2. System Context
- Parent: **[ATA 73 Overview (OV-E)](../73-00/GP-AM-AMPEL-0100-73-00-00-000-OV-E.md)**
- Engine context: **[ATA 72 OV-B](../../ATA72_Engine/72-00/GP-AM-AMPEL-0100-72-00-00-000-OV-B.md)**
- Program overview: **[OV-D](../../ATA00_General/00-00/GP-AM-AMPEL-0100-00-00-00-000-OV-D.md)**
- Interfaces: **ATA 28** (fuel), **ATA 77** (sensors), **ATA 76/31** (FD/CMS), **ATA 26** (fire).

# 3. Architecture Baseline

## 3.1 FADEC Hardware
- **Channels:** A / B, independent power & IO.
- **Power:** Dual feeds (ATA 24) + ride-through ⟨200 ms⟩ (covers AFDX failover/brownout).

## 3.2 FADEC Software & Partitioning
- **OS:** ARINC 653 compliant RTOS.
- **Partitions:** P1(DAL A) Protections, P2(DAL B) Transitions, P3(DAL C) Health Monitoring, P4(DAL D) Maintenance.

## 3.3 Networks & Buses
- **AFDX (ARINC 664 P7):** Dual-homed NIC. Virtual Links defined in **ICD-73-ICL-001**.
- **ARINC 429:** Legacy/fallback bus.
- **Sync/Timing:** IEEE-1588 PTP (profile ⟨TBD⟩).

# 4. Control Laws & Protections

## 4.1 Thrust Scheduling
- **Inputs:** TLA, ambient conditions, engine parameters, **BLI gain correction**.
- **Command:** **EPR/N1** schedule mapped to **FMV-H₂ / FMV-SAF** fuel flow.

## 4.2 Protection Functions (DAL A)
- **Surge Margin Guard:** ΔSM ≥ ⟨4%⟩.
- **EGT Thermal Limit:** Rate and absolute clamps.
- **Rotor Overspeed:** Staged fuel cutback and hard trips.
- **H₂ Safety Interlocks:** Inhibit GH₂ admission based on leak, pressure, and pre-chill status.

## 4.3 Hybrid Transition Executor (DAL B)
Implements the state machine from OV-E §2.3, with reversion to SAF in ≤ ⟨5 s⟩ on L1 fault.

## 4.4 Start & Relight Control
All start and relight sequences are commanded on SAF only within the certified envelope (**⟨250–400 kt⟩ / ⟨FL100–FL300⟩**).

# 5. Actuated Elements
The FADEC commands and monitors VSV, VBV (if fitted), FMV-H₂, FMV-SAF, Transition Valves, HPSOV/SOV, and the HX Bypass. All elements are enumerated in **ICD-73-10-ACT-002**.

# 6. Health Monitoring & Degradation
BIT/BITE routines and fault classification are defined. Single-channel operations result in degradations **annunciated via CAS to CMS per MMEL**.

# 7. Interfaces (ICD Index)
- **ICD-73-ICL-001** — AFDX VLs (`VL_73_CMD/STAT/FAULT`); QoS: BAF ⟨TBD⟩, latency ⟨TBD ms⟩.
- **ICD-73-10-ACT-002** — Actuation signals.
- **ICD-73-10-SEN-003** — Sensor inputs.
- **ICD-28-73-FUEL-004** — Fuel & GN₂ interfaces.
- **ICD-26-73-FIRE-005** — Fire loops, HPSOV/SOV commands.
- **ICD-76-73-FD-006** — FD/CAS messages.
- **ICD-77-73-MAINT-007** — CMS/BITE data.

# 8. Safety & Compliance — Linked References
Compliance with EASA CS-E/CS-25, FAA 14 CFR Part 33/25, RTCA DO-178C/254/160/326A, and SAE ARP4754A/4761A is mandatory. See program overview for a central list of standards.

# 9. Tests & Verification
A matrix of SIL/HIL, Rig, Ground, System, and Network tests is defined to verify all requirements.

# 10. Open TBDs
Key open items include BLI correction interface, AFDX QoS values, final protection limits, and DO-160 categories.

# 11. Glossary
See program glossary: **[GP-AM-AMPEL-0100-00-00-00-002-GLO-C.md](../../ATA00_General/00-00/GP-AM-AMPEL-0100-00-00-00-002-GLO-C.md)**.

---
[↑ Back to Top](#controls--actuation--ata-73-10-fadec-valves-vsvvbv)

---

Archived Revision Stubs (in .../73-10/_revisions/)

_revisions/GP-AM-AMPEL-0100-73-10-00-000-SYS.revB.md

---
title: Controls & Actuation — ATA 73-10 (FADEC, Valves, VSV/VBV)
document_id: GP-AM-AMPEL-0100-73-10-00-000-SYS
revision: B
version: 1.0.0
date: 2025-05-29
status: Superseded
classification: INTERNAL
---

> Archived snapshot of Rev B. See current baseline here:
> [../GP-AM-AMPEL-0100-73-10-00-000-SYS.md](../GP-AM-AMPEL-0100-73-10-00-000-SYS.md)

_revisions/GP-AM-AMPEL-0100-73-10-00-000-SYS.revA.md

---
title: Controls & Actuation — ATA 73-10 (FADEC, Valves, VSV/VBV)
document_id: GP-AM-AMPEL-0100-73-10-00-000-SYS
revision: A
version: 1.0.0
date: 2025-05-28
status: Superseded
classification: INTERNAL
---

> Archived snapshot of Rev A. See current baseline here:
> [../GP-AM-AMPEL-0100-73-10-00-000-SYS.md](../GP-AM-AMPEL-0100-73-10-00-000-SYS.md)

---

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