Dassault Falcon 20 & HU-25 Guardian — Technical & Operational Documentation Collection

The Dassault Falcon 20 — marketed in its early form as the Mystère 20 and later as the Fan Jet Falcon — is a twin-engine swept-wing business jet developed by Avions Marcel Dassault, first flown in 1963 and delivered from 1965. Its military derivative, the Grumman/Dassault HU-25 Guardian, served the United States Coast Guard (USCG) from 1982 through 2014 as a medium-range surveillance, search-and-rescue, and drug interdiction platform — one of the most operationally demanding adaptations of any business jet airframe in service history.

This archival collection assembles primary-source technical, operational, and engineering documentation spanning the full Falcon 20 / HU-25 family, from the original Mystère 20 civil certification baseline through the specialised HU-25A/C/D Guardian variants.

1. Airframe & Aerodynamic Configuration

• Configuration: Low-wing cantilever monoplane — heavily swept wing derived from Marcel Dassault's fighter programme heritage (Mystère IV / Étendard lineage)
• Wing Geometry: Full-cantilever swept wing optimised for stable high-speed dash profiles; high-speed roll rate inherited from Mystère fighter architecture
• Secondary Flight Controls: Hydraulically augmented mechanical systems — flap/slat control integration, tailplane trim indicators, roll/pitch enhancement systems
• Drag Profiles: Empirical flight data covering viscous drag, wave drag containment, and cross-flow characteristics over fuselage and engine nacelle pylons during sub-Mach transitions
• Undercarriage: Dual-wheel tricycle landing gear — optimised for balance and directional stability on asymmetric thrust profiles

2. Powerplant Variants

3. Handling, Stability & Systems

• Static Stability: High clean-wing roll rate controlled via dual-wheel tricycle landing gear balancing and optimised control surfaces
• Low-Altitude Dynamics: HU-25 documentation details structural dampening performance under extreme thermal gradients below 5,000 ft over salt-water environments
• Asymmetric Thrust Control: Technical notes cover rudder force minimums and lateral trim authorities during single-engine V₁ cuts and emergency go-arounds

4. Performance Data

• Maximum Operating Speed (Mmo): Mach 0.855 — 420 knots maximum cruising speed at altitude
• Sea Level Max Speed: 350 knots
• Service Ceiling: 42,000 ft (12,800 m)
• MTOW: 28,660 lb (13,000 kg) civil baseline — up to 32,000 lb (14,515 kg) for fully equipped USCG Guardian variants

5. Operational Variants Covered

• Mystère 20 / Fan Jet Falcon — original civil certification baseline; Avions Marcel Dassault factory documentation
• Fan Jet Falcon Series D — performance brochure with payload vs. distance, climb, fuel consumption, and balanced field length data
• Falcon 20 ST — Nav-Attack System Trainer — Avions Marcel Dassault STV 138 / 20-2-71 / Édition 1; fighter-bomber equipment, special modifications, and utilisation documentation
• Falcon Jet Family — Multi-Role Aircraft — USCG Coast Guard surveillance and SAR variant engineering overview
• HU-25 Guardian CGTO 1U-25A-1 — USCG Series HU-25 Flight Manual, 1 July 1999, Change 3 (1 December 2003); includes OPSUP 3–6 and Message supplements
• HU-25 Guardian CG-FM-OSS EFIS — Electronic Flight Instrument System operational supplement

Document Manifest

• Mystère 20 — Falcon: Original Avions Marcel Dassault civil brochure (F-BRHB registration cover)
• Fan Jet Falcon — Aircraft Operating Manual (AOM): Avions Marcel Dassault factory edition
• Fan Jet Falcon Series D — Performance Brochure: General characteristics, flight deck & avionics, interior layout, weight data, limitations, flight envelope, performance analysis, payload vs. distance, flight planning (max cruise / long range), endurance vs. altitude, balanced field length, reserves, climb performance, fuel consumption, descent & landing data
• Falcon Jet Family — Multi-Role Aircraft Brochure: USCG Coast Guard variant overview
• Falcon 20 ST — Nav-Attack System Trainer: STV 138 / 20-2-71 / Édition 1 — General/basic Falcon description (p. 3), fighter-bomber equipment (p. 6), special modifications (p. 8), utilisation (p. 23)
• CGTO 1U-25A-1 — USCG HU-25 Series Flight Manual: 1 July 1999, Change 3 (1 December 2003) — includes Message, OPSUP 3, OPSUP 4, OPSUP 5, OPSUP 6
• CG-FM-OSS EFIS — HU-25 Electronic Flight Instrument System Operational Supplement

⚠️ Regulatory Notice: Under FAA 14 CFR § 43.13 and EASA Part-M, any mechanic performing maintenance on an active aircraft must use current, manufacturer-approved revision-controlled data. This archival document does not satisfy that requirement.

This is an archival, static-copy edition fixed at its original publication date. Intended for historical reference, flight simulation, museum restoration, and educational use only. Not approved for active airworthiness maintenance under FAA 14 CFR § 43.13, EASA Part-M, or equivalent international regulations. Operators of active aircraft must use current, revision-controlled publications from the Type Certificate holder or an authorised distributor.

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