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Beechcraft King AIR C90 Systems Flight Service Repair Workshop Manual
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🏷️ Basic Information Identification Make: Beechcraft Model: King Air C90 Model Variant: King Air C90 (twin-engine turboprop) Production Years Covered: C90 series from initial introduction (1971) through later C90 variants;...
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🏷️ Basic Information
Identification
Make:
Beechcraft
Model:
King Air C90
Model Variant:
King Air C90 (twin-engine turboprop)
Production Years Covered:
C90 series from initial introduction (1971) through later C90 variants; manual edition coverage applies to specific serial ranges
Aircraft Category:
Pressurized twin-engine turboprop business aircraft
👋 Introduction
Purpose
Manual Type:
Systems-focused flight service, repair and workshop manual
Intended Audience:
Licensed A&P mechanics, avionics technicians, maintenance organizations, and owner-operators
Content Focus:
Aircraft systems description, operation, troubleshooting, and repair procedures
Key Features
Systems Detail:
Complete coverage of aircraft systems with schematics and component descriptions
Workshop Procedures:
Shop-level repair, overhaul, and adjustment instructions
Reference Use:
Suitable for hangar and shop bench reference during inspection and repair
📋 Manual Details
Manual Information
Coverage Areas:
Airframe systems, powerplant-related systems, flight controls, landing gear, hydraulics, pneumatics, electrical, fuel, and pressurization/environmental systems
Manual Type:
Systems flight service repair workshop manual
Language:
English
Format:
PDF
Delivery Method:
Instant digital download
Binding:
Digital
Document Details
Page Count:
N/A - total page count varies by revision and serial number range
Illustrations:
Includes system schematics, diagrams, and component illustrations
Revision Status:
Check applicable revision list against aircraft serial number before use
📖 Manual Coverage
Systems Covered
Flight Controls:
Aileron, elevator, rudder systems, trim systems, and control cable rigging procedures
Landing Gear:
Retractable tricycle gear, extension/retraction system, brakes, and nose wheel steering
Hydraulic Systems:
Hydraulic power supply, gear actuation, and related components
Pneumatic Systems:
Engine bleed air, pneumatic distribution, and related valves
Electrical System:
DC power generation, battery, starter-generators, distribution buses, and external power
Fuel System:
Fuel tanks, boost pumps, fuel control, fuel flow indication, and crossfeed
Environmental Systems:
Cabin pressurization, heating, air conditioning, and ventilation
Ice and Rain Protection:
Pneumatic deice boots, propeller deice, windshield heat, and pitot heat
Pressurization:
Cabin pressure control, outflow valve, safety valve, and differential limits
Powerplant Systems:
Engine-related systems including oil, ignition, and propeller interfaces
Propeller System:
Propeller control, feathering, and synchronization systems
Fire Protection:
Engine fire detection and extinguishing systems
Procedures and Technical Depth
Troubleshooting:
System fault isolation charts and troubleshooting procedures
Adjustment and Rigging:
Control surface rigging, cable tension, and stop adjustment procedures
Removal and Installation:
Component removal, installation, and inspection instructions
Testing:
Operational and functional test procedures for major systems
Torque Data:
Fastener torque values and standard practices references
Schematics:
Electrical wiring logic and hydraulic/pneumatic system schematics
Parts Information
Part Numbers:
Beechcraft part numbers referenced where applicable in procedures
Parts Catalog:
Separate illustrated parts catalog required for complete parts breakdown
📊 Manual Specifications
File & Compatibility
File Format:
PDF (searchable, bookmarked, zoomable)
Compatibility:
Windows, macOS, Linux, iOS, and Android — any device with a PDF reader
Requirements:
A PDF reader application (e.g. Adobe Acrobat Reader, free)
Searchability:
Fully text searchable for fast lookup of any topic
Print & Binding
Print Quality:
High-resolution digital pages, printable at full clarity
Binding Type:
N/A — digital download, no physical binding
Paper Type:
N/A — digital download, no physical paper
⚙️ Engine Specifications
Engines
Engine Type:
Two Pratt & Whitney Canada PT6A-21 turboprop engines (C90; later variants PT6A-135)
Rated Takeoff Power:
Approximately 550 shaft horsepower per engine
Propeller:
McCauley four-blade constant-speed, full-feathering, reversible propellers
Fuel System
Fuel Type:
Jet A / Jet A-1 turbine fuel
Usable Fuel Capacity:
Approximately 384 US gallons total (two wing nacelle tank systems)
Fuel Control:
PT6 hydromechanical fuel control with manual backup
🔧 Transmission
Powerplant Drivetrain
Power Transmission:
N/A - turbine engines drive propellers through integral reduction gearing, not a transmission
Reduction Gear:
Integral PT6 planetary reduction gearbox at propeller
Propeller Control:
Constant-speed propeller governor with feathering and beta/reverse capability
📐 Dimensions
Exterior
Wingspan:
Approximately 50 ft 3 in (15.32 m)
Length:
Approximately 35 ft 6 in (10.82 m)
Height:
Approximately 14 ft 3 in (4.34 m)
Weights
Maximum Takeoff Weight:
9,625 lb (C90; higher for later variants)
Maximum Landing Weight:
9,625 lb (varies by variant)
Typical Basic Empty Weight:
N/A - varies by configuration and installed equipment
🛡️ Safety Features
Certification
Certification Basis:
FAR Part 23 (normal category airplane), single-pilot certified
Crash Test Ratings:
N/A - FAA Part 23 certification, not consumer crash-test rated
Safety Systems
Engine Fire Detection:
Engine fire detection and extinguisher system
Pressurization Safety:
Cabin altitude warning and safety (pressure relief) valve
Landing Gear Safety:
Gear position warning, gear-up landing protection, and emergency gear extension
Stall Warning:
Stall warning system with aural alert
Passive Features
Airframe Structure:
Pressurized fail-safe light-alloy structure
Seats and Restraints:
Certified crew and passenger seats with lap-belt restraint systems
💡 Technology Features
Avionics
Standard Avionics:
Era-appropriate avionics; King (Bendix/King) radios, navigation, and autopilot were common factory fits
Autopilot:
Optional flight director/autopilot systems depending on aircraft configuration
Installed Equipment:
Avionics fit varies widely by serial number and prior upgrades; refer to the aircraft's equipment list
🔧 Maintenance
Service Intervals
Inspection Program:
Beechcraft-approved inspection program with periodic (100-hour / phase-based) inspections
Engine Overhaul:
PT6A hot-section inspection and overhaul per Pratt & Whitney Canada schedules
Propeller Overhaul:
Scheduled propeller overhaul at manufacturer-specified intervals
Fluids and Wear Items
Engine Oil:
Turbine engine oil per PT6A specification (Type II turbine oil)
Hydraulic Fluid:
MIL-H-5606 hydraulic fluid per Beechcraft specification
Common Wear Items:
Deice boot condition, landing gear bushings and pins, control cables, and brake linings
Known Maintenance Areas:
Aging wiring, fuel system seal condition, and pressurization door seal wear on high-time airframes
📚 Vehicle History
Heritage
Manufacturer:
Beech Aircraft Corporation (later Raytheon Aircraft, now Textron Aviation), Wichita, Kansas
Model Origin:
The King Air line derives from the Model 90 series introduced in 1964; the C90 was introduced in 1971 with PT6A-21 engines
Model Evolution:
Progressed through C90A (1982), C90B, C90SE, C90GT, and C90GTx with increased power and updated systems
Production Location:
Wichita, Kansas, USA
Lineage:
One of the most successful turboprop business aircraft families, in continuous production for decades
🏆 Awards & Recognition
Recognition
Industry Standing:
The King Air family is widely recognized as a benchmark in the twin-turboprop business aircraft class
Production Longevity:
Multi-decade production run with strong parts and service support network
Formal Awards:
N/A - no specific formal award records cited for the C90 in this manual