Raisbeck Engineering BEECHCRAFT KING AIR C90 Owner's manual

Revision IR: August 15, 2017 Document No. 16-206CGW-28
PILOT’S OPERATING HANDBOOK
and
FAA-Approved Airplane Flight Manual Supplement
for the
KING AIR
MODEL C90
(S/N LJ-527 thru LJ-1062)
Equipped with Raisbeck Engineering:
•Swept Blade Turbofan Propellers - STC SA3593NM
•Dual Aft Body Strakes - STC SA4010NM
•Increased Gross Weight - STC SA3593NM
and West Tennessee Aviation:
•Installation of Pratt & Whitney PT6A-28 Engines - STC SA1206SO

BEECHCRAFT King Air C90 Equipped With:
•Swept Blade Turbofan Propellers
•Dual Aft Body Strakes Document No. 16-206CGW-28
•Increased Gross Weight
•PT6A-28 Engines
Revision IR: August 15, 2017 i
PILOT’S OPERATING HANDBOOK AND
FAA-APPROVED AIRPLANE FLIGHT MANUAL SUPPLEMENT
FOR THE BEECHCRAFT KING AIR MODEL C90
Equipped with Raisbeck Engineering:
•Swept Blade Turbofan Propellers - STC SA3593NM
•Dual Aft Body Strakes - STC SA4010NM
•Increased Gross Weight - STC SA3593NM
and West Tennessee Aviation:
•Installation of Pratt & Whitney PT6A-28 Engines - STC SA1206SO
Reg. No._____________________
Ser. No._____________________
This Supplement must be attached to the Beechcraft Pilot’s Operating Handbook and FAA-approved
Airplane Flight Manual when Raisbeck Swept Blade Turbofan Propellers, Dual Aft Body Strakes,
Increased Gross Weight and West Tennessee Aviation PT6A-28 Engines are installed in accordance
with the STCs listed above. The information contained in this document supplements or supersedes
the basic manual only in those areas listed. For limitations, procedures, and performance information
not contained in this supplement, consult the Beechcraft Pilot’s Operating Handbook and FAA-
approved Airplane Flight Manual and the West Tennessee Aviation Airplane Flight Manual Supplement
per STC SA1206SO.
I. GENERAL
II. LIMITATIONS
III. EMERGENCY PROCEDURES
IV. NORMAL PROCEDURES
V. PERFORMANCE
VI. WEIGHT AND BALANCE
VII.
VIII. SYSTEMS DESCRIPTION
FAA-Approved ________________________________
Manager, Flight Test Branch, AIR-710
Federal Aviation Administration
Compliance and Airworthiness Division
Aircraft Certification Service

BEECHCRAFT King Air C90 Equipped With:
•Swept Blade Turbofan Propellers
•Dual Aft Body Strakes
•Increased Gross Weight
•PT6A-28 Engines
ii Revision IR: August 15, 2017
Document No. 16-206CGW-28
PILOT’S OPERATING HANDBOOK AND
FAA-APPROVED AIRPLANE FLIGHT MANUAL SUPPLEMENT FOR THE
BEECHCRAFT KING AIR MODEL C90
Original Issue ................................................................................................................... August 15, 2017
Title Page
Pages i thru iii, 1-1, 2-1 thru 2-3, 3-1, 4-1, 4-2, 5-1 thru 5-40, 6-1, and 7-1
LOG OF REVISIONS
REV PAGE(S) DESCRIPTION FAA-APPROVED DATE
IR All Initial Release

BEECHCRAFT King Air C90 Equipped With:
•Swept Blade Turbofan Propellers
•Dual Aft Body Strakes Document No. 16-206CGW-28
•Increased Gross Weight
•PT6A-28 Engines
Revision IR: August 15, 2017 iii
TABLE OF DIVISIONS
SECTION I ............................................................................................................... GENERAL
SECTION II ......................................................................................................... LIMITATIONS
SECTION III ............................................................................. EMERGENCY PROCEDURES
SECTION IV ..................................................................................... NORMAL PROCEDURES
SECTION V .................................................................................................... PERFORMANCE
SECTION VI ...................................................................................... WEIGHT AND BALANCE
SECTION VII ................................................................................... SYSTEMS DESCRIPTION

BEECHCRAFT King Air C90 Equipped With:
•Swept Blade Turbofan Propellers
•Dual Aft Body Strakes
•Increased Gross Weight
•PT6A-28 Engines
Revision IR: August 15, 2017 1-4
Document No. 16-206CGW-28
Section I - General
SECTION I — GENERAL
INTRODUCTION
Thank you ...
for displaying your confidence in selecting quality products from RAISBECK ENGINEERING INC.
Our design engineers, craftsmen, and technicians have utilized their professional skills and years of
experience to provide you with state-of-the-art systems to enhance the performance, safety, and
productivity of your King Air.
The information contained in this Pilot’s Operating Handbook and FAA-Approved Airplane Flight
Manual Supplement highlights the areas of performance improvement which can be expected from your
Raisbeck-equipped King Air C90.
After you have operated your Raisbeck-equipped Beechcraft King Air C90 for a period of time, we
would like to hear your comments regarding our systems in service with your operation. Please feel free
to contact us at any time by mail or telephone.
Raisbeck Engineering, Inc.
4411 South Ryan Way
Seattle, Washington 98178
U.S. 800-537-7277
Intl. 1-206-723-2000
FAX [phone]
For current revision status visit www.raisbeck.com
PROPELLERS
No. of Propellers: 2
Propeller Manufacturer: Hartzell Propeller Inc.
No. of Blades: 4
Propeller Diameter:
Maximum: 96 inches
Minimum: 95 inches
Propeller Type: Constant-speed, Full-feathering, Reversing, Counter-weighted,
Hydraulically Actuated consisting of D9510SK blades
and HC-D4N-3C hubs.
Pitch Range (30-inch station):
Reverse: -10.0° ± 0.5°
Feathered: +86.7° ± 0.5°

BEECHCRAFT King Air C90 Equipped With:
•Swept Blade Turbofan Propellers
•Dual Aft Body Strakes
•Increased Gross Weight
•PT6A-28 Engines
Revision IR: August 15, 2017 2-1
Document No. 16-206CGW-28
Section II - Limitations
SECTION II — LIMITATIONS
POWERPLANT
Engine Model ....................................................................................... Pratt & Whitney of Canada PT6A-28
ENGINE OPERATING LIMITS
See the West Tennessee Aviation (STC SA1206SO) airplane flight manual supplement for applicable
engine limitations.
PROPELLER BLADE AND HUB NUMBERS
Two full-feathering, constant-speed, reversing, four-bladed propellers consisting of D9510SK blades and
HC-D4N-3C hubs.
PROPELLER DIAMETER
Maximum diameter: 96.0 inches
Minimum diameter: 95.0 inches
PROPELLER BLADE ANGLES AT 30-INCH STATION
Reverse: -10.0° ± 0.5°
Feathered: +86.7° ± 0.5°
PROPELLER REVERSE SPEED LIMITS
Do not select REVERSE until airspeed is below 95 KIAS.
WARNING
PROPELLERS WILL NOT REVERSE AT AIRSPEEDS ABOVE 100
KIAS. BETWEEN 95 KIAS AND 100 KIAS, SIGNIFICANT THRUST
ASYMMETRY MAY OCCUR IF REVERSE IS SELECTED.
PROPELLER ROTATIONAL SPEED LIMITS
CAUTION
Stabilized ground operation between 400 and 1,100 RPM is prohibited.
Operation between 0 and 400 RPM is permissible only with propeller
feathered.
WARNING
STABILIZED GROUND OPERATION WITHIN THE PROPELLER
RESTRICTED RPM RANGE CAN GENERATE HIGH PROPELLER
STRESSES AND RESULT IN PROPELLER FAILURE AND LOSS OF
CONTROL OF THE AIRCRAFT.
The maximum propeller overspeed limit is 2,420 RPM. Propeller speeds above 1,900 RPM indicate
failure of the primary governor. Propeller speeds above 2,000 RPM indicate failure of both primary and
overspeed governors.

BEECHCRAFT King Air C90 Equipped With:
•Swept Blade Turbofan Propellers
•Dual Aft Body Strakes
•Increased Gross Weight
•PT6A-28 Engines
2-2 Revision IR: August 15, 2017
Document No. 16-206CGW-28
POWERPLANT INSTRUMENT MARKINGS
Propeller Tachometer:
Green Arc ............................................................................................. 1600 to 1900 RPM
Red Radial .......................................................................................................... 1900 RPM
Torquemeter:
Green Arc ................................................................................................ 400 to 1520 ft-lbs
Red Radial .......................................................................................................... 1520 ft-lbs
MISCELLANEOUS INSTRUMENT MARKINGS
Propeller De-ice Ammeter:
Green Arc .................................................................................................................. 18 to 24 amps
BEECH PROPELLER AUTOFEATHER SYSTEM INSTALLATION REQUIREMENTS
The optional Beech propeller autofeather system must be installed, operational, and armed prior to
takeoff and landing.
CAUTION
VMCA with one-engine inoperative, thrust lever at idle, and propeller
windmilling is 99 KIAS (101 KCAS).
AIRSPEED LIMITATIONS
Air Minimum Control Speed, VMCA ................................................................................. 93 KCAS (91 KIAS)
AIRSPEED INDICATOR MARKINGS
Red Radial (Air Minimum Control Speed, VMCA) ............................................................................. 93 KCAS
FLIGHT LOAD FACTORS
At the design gross weight of 10,500 lbs ............................... Maneuver – positive 3.27G – negative 1.31G
MAXIMUM WEIGHT
Maximum Taxi Weight .................................................................................................................. 10,560 lbs
Maximum Takeoff Weight ............................................................................................................. 10,500 lbs
Maximum Landing Weight .............................................................................................................. 9,700 lbs
Maximum Zero Fuel Weight:
For MTOW below 9,650 lbs .......................................................................................... No limitation
For MTOW between 9,650 and 10,500 lbs ....................................................................... 9,000 lbs
NOTE
10-ply rated main landing gear tires required for operation above 10,100 lbs.

BEECHCRAFT King Air C90 Equipped With:
•Swept Blade Turbofan Propellers
•Dual Aft Body Strakes
•Increased Gross Weight
•PT6A-28 Engines
Revision IR: August 15, 2017 2-3
Document No. 16-206CGW-28
Section II - Limitations
CENTER OF GRAVITY LIMITS (LANDING GEAR EXTENDED)
Aft Limit .......................................................................................... 160.0 inches aft of Datum at all weights
Forward Limit at:
10,500 lbs ...................................................................................................... 154.8 inches aft of Datum
10,350 lbs ...................................................................................................... 154.5 inches aft of Datum
10,100 lbs ...................................................................................................... 154.0 inches aft of Datum
9,700 lbs ........................................................................................................ 154.0 inches aft of Datum
9,168 lbs ........................................................................................................ 151.4 inches aft of Datum
7,400 lbs or less ............................................................................................ 144.7 inches aft of Datum
PLACARDS
On Existing Overhead Panel in Pilot’s Compartment:
MIN SINGLE ENGINE CONTROL 93 KNOTS (107 MPH)

BEECHCRAFT King Air C90 Equipped With:
•Swept Blade Turbofan Propellers
•Dual Aft Body Strakes
•Increased Gross Weight
•PT6A-28 Engines
Revision IR: August 15, 2017 3-1
Document No. 16-206CGW-28
Section III – Emergency Procedures
SECTION III — EMERGENCY PROCEDURES
ELECTROTHERMAL PROPELLER DE-ICE
Operation in icing conditions with abnormal readings on the de-ice ammeter are not recommended
and ice removal cannot be assured. Normal Operation: 18 to 24 amps.
1. Zero Amps:
a. Breaker Switch - CHECK.
b. If OFF, reposition to ON after 30 seconds.
c. If ON with zero amps, system is inoperative. Position switch to OFF.
2. Zero to 18 Amps:
a. Continue operation.
b. If propeller imbalance occurs, increase RPM briefly to aid in ice removal.
3. 24 to 29 Amps:
a. Continue operation.
b. If propeller imbalance occurs, increase RPM briefly to aid in ice removal.
4. More than 29 Amps:
a. Avoid icing conditions, since continued operation of the system cannot be assured.
b. Do not operate the system, except in emergencies.
c. Restrict time of operation to a minimum.

BEECHCRAFT King Air C90 Equipped With:
•Swept Blade Turbofan Propellers
•Dual Aft Body Strakes
•Increased Gross Weight
•PT6A-28 Engines
Revision IR: August 15, 2017 4-1
Document No. 16-206CGW-28
Section IV – Normal Procedures
SECTION IV — NORMAL PROCEDURES
AFTER STARTING ENGINES
CAUTION
Stabilized ground operation between 400 and 1,100 RPM is prohibited.
Operation between 0 and 400 RPM is permissible only with propeller
feathered.
WARNING
STABILIZED GROUND OPERATION WITHIN THE PROPELLER
RESTRICTED RPM RANGE CAN GENERATE HIGH PROPELLER
STRESSES AND RESULT IN PROPELLER FAILURE AND LOSS OF
CONTROL OF THE AIRCRAFT.
ICING FLIGHT
Electrothermal Propeller De-ice:
CAUTION
Do not operate propeller de-ice when propellers are static.
a. Before Takeoff:
(1) Propeller Heat Switch - HEAT.
(2) Propeller De-ice Ammeter - CHECK: 18 to 24 AMPERES. Monitor for 2 minutes
to assure automatic timer operation.
b. In Flight:
(1) Propeller Heat Switch - HEAT. The system may be operated continuously in
flight and will function automatically until the switch is turned to OFF.
(2) Relieve propeller imbalance due to ice by increasing RPM briefly and returning to
the desired setting. Repeat as necessary.
CAUTION
If the de-ice ammeter does not indicate 18 to 24 amperes, refer to the
EMERGENCY PROCEDURES section.
LANDING
WARNING
PROPELLERS WILL NOT REVERSE AT AIRSPEEDS ABOVE 100
KIAS. BETWEEN 95 KIAS AND 100 KIAS, SIGNIFICANT THRUST
ASYMMETRY MAY OCCUR IF REVERSE IS SELECTED.
SIMULATING ENGINE FAILURES
CAUTION
Using throttle cuts to simulate engine failures will result in the autofeather
system being disarmed. In this configuration the VMCA is 99 KIAS (101
KCAS). Dynamic throttle cuts should only be attempted at airspeeds
above 104 KIAS (105 KCAS).

BEECHCRAFT King Air C90 Equipped With:
•Swept Blade Turbofan Propellers
•Dual Aft Body Strakes
•Increased Gross Weight
•PT6A-28 Engines
4-2 Revision IR: August 15, 2017
Document No. 16-206CGW-28
NOISE CHARACTERISTICS
Approach to and departure from an airport should be made so as to avoid prolonged flight at low
altitude near noise-sensitive areas. Avoidance of noise-sensitive areas, if practical, is preferable
to overflight at relatively low altitudes.
For VFR operations over outdoor assemblies of persons, recreational and park areas, and other
noise-sensitive areas, pilots should make every effort to fly not less than 2,000 feet above the
surface, weather permitting, even though flight at a lower level may be consistent with the
provisions of government regulations.
NOTE
The preceding recommended procedures do not apply where they would
conflict with Air Traffic Control clearances or instructions, or where, in the
pilot’s judgment, an altitude of less than 2,000 feet is necessary to
adequately exercise his duty to see and avoid other airplanes.
The corrected takeoff noise level of this airplane, established in compliance with FAR Part 36,
Appendix G (Amdt 36-28) and ICAO Annex 16, Chapter 10, is 76.0 dB as determined by flight
tests. No determination has been made by the Federal Aviation Administration that the noise
levels of this airplane are or should be acceptable for operation at, into, or out of any airport.
The above statement notwithstanding, the noise level stated above has been verified by and
approved by the Federal Aviation Administration in noise level test flights conducted in
accordance with FAR Part 36, Appendix G, Amendment 28, Noise Standards: Airplane Type and
Airworthiness Certification. The airplane noise is in compliance with all FAR Part 36 noise
standards applicable to this type.

BEECHCRAFT King Air C90 Equipped With:
•Swept Blade Turbofan Propellers
•Dual Aft Body Strakes
•Increased Gross Weight
•PT6A-28 Engines
Revision IR: August 15, 2017 5-1
Document No. 16-206CGW-28
Section V – Performance
SECTION V — PERFORMANCE
TABLE OF CONTENTS
INTRODUCTION
Introduction ........................................................................................................................................... 5-2
TAKEOFF AND CLIMB DATA
Stall Speeds – Zero Thrust ................................................................................................................... 5-3
Minimum Takeoff Power at 1900 RPM ................................................................................................. 5-4
Maximum Takeoff Weight Permitted by Enroute Climb Requirement .................................................. 5-5
Maximum Allowable TOGW above 10,350 LBS ................................................................................... 5-6
Takeoff Distance – Flaps 0% – Two Engines ....................................................................................... 5-7
Accelerate-Stop Distance ..................................................................................................................... 5-8
Accelerate-Go Distance ........................................................................................................................ 5-9
Takeoff Climb Gradient – One-Engine-Inoperative ............................................................................ 5-10
Climb – Two Engine – Flaps Up ......................................................................................................... 5-11
Climb – One Engine Inoperative – Flaps Up....................................................................................... 5-12
Cruise Climb ....................................................................................................................................... 5-13
CRUISE DATA
Maximum Recommended Cruise Power Tables:
ISA -30°C ..................................................................................................................................... 5-15
ISA -20°C ..................................................................................................................................... 5-16
ISA -10°C ..................................................................................................................................... 5-17
ISA ................................................................................................................................................ 5-18
ISA +10°C .................................................................................................................................... 5-19
ISA +20°C .................................................................................................................................... 5-20
ISA +30°C .................................................................................................................................... 5-21
ISA +40°C .................................................................................................................................... 5-22
Maximum Recommended Cruise Power Graphs:
Range Profile ............................................................................................................................... 5-23
Cruise Speeds .............................................................................................................................. 5-24
Fuel Flow ...................................................................................................................................... 5-25
Maximum Range Power Tables:
ISA -30°C ..................................................................................................................................... 5-27
ISA -20°C ..................................................................................................................................... 5-28
ISA -10°C ..................................................................................................................................... 5-29
ISA ................................................................................................................................................ 5-30
ISA +10°C .................................................................................................................................... 5-31
ISA +20°C .................................................................................................................................... 5-32
ISA +30°C .................................................................................................................................... 5-33
ISA +37°C .................................................................................................................................... 5-34
Maximum Range Power Graphs:
Range Profile ............................................................................................................................... 5-35

BEECHCRAFT King Air C90 Equipped With:
•Swept Blade Turbofan Propellers
•Dual Aft Body Strakes
•Increased Gross Weight
•PT6A-28 Engines
5-2 Revision IR: August 15, 2017
Document No. 16-206CGW-28
DESCENT AND LANDING DATA
Holding Time ....................................................................................................................................... 5-37
Descent................................................................................................................................................ 5-38
Balked Landing Climb ......................................................................................................................... 5-39
Landing Distance Without Reversing ................................................................................................. 5-40
INTRODUCTION
The performance of all Beechcraft King Air C90 airplanes equipped with the Raisbeck Increased Gross
Weight System will perform to the graphs and charts in this section, up to a maximum takeoff gross weight of
10,500 lbs and a maximum landing weight of 9,700 lbs.
Federal Aviation Regulations for this class aircraft require only that the all-engines operating distance over a
50 foot height be presented for take-off distance. We include for your information accelerate-go, accelerate-
stop, climb-limited weight, net climb gradient, and other FAR 25 transport category information. For data not
shown in this section, refer to the Performance section of the Beechcraft POH.
Takeoff RPM has been reduced to 1900 RPM, with maximum torque increased to 1520 ft-lbs for all flight
conditions.

BEECHCRAFT King Air C90 Equipped With:
•Swept Blade Turbofan Propellers
•Dual Aft Body Strakes
•Increased Gross Weight
•PT6A-28 Engines
Revision IR: August 15, 2017 5-3
Document No. 16-206CGW-28
Section V – Performance

BEECHCRAFT King Air C90 Equipped With:
•Swept Blade Turbofan Propellers
•Dual Aft Body Strakes
•Increased Gross Weight
•PT6A-28 Engines
5-4 Revision IR: August 15, 2017
Document No. 16-206CGW-28

BEECHCRAFT King Air C90 Equipped With:
•Swept Blade Turbofan Propellers
•Dual Aft Body Strakes
•Increased Gross Weight
•PT6A-28 Engines
Revision IR: August 15, 2017 5-5
Document No. 16-206CGW-28
Section V – Performance

BEECHCRAFT King Air C90 Equipped With:
•Swept Blade Turbofan Propellers
•Dual Aft Body Strakes
•Increased Gross Weight
•PT6A-28 Engines
5-6 Revision IR: August 15, 2017
Document No. 16-206CGW-28
MAX ALLOWABLE T.O.G.W. ~ LBS
10350
10400
10450
10500
OUTSIDE AIR TEMPERATURE ~ DEGREES C
-40 -30 -20 -10 0 10 20 30 40
MAX ALLOWABLE TAKE-OFF GROSS WEIGHT ABOVE 10,350 LBS
IN ORDER TO ACHIEVE PART 25 APPROACH CLIMB & LANDING REQUIREMENTS
EXAMPLE:
OAT .............................................................
AIRPORT PRESSURE ALTITUDE ..................
MAX ALLOWABLE T.O.G.W. .........................
-2° C
2,000 FT
10,475 LBS
6,000 FT
4,000 FT
2,000 FT
SEA LEVEL
PRESSURE ALTITUDE ~ FEET

BEECHCRAFT King Air C90 Equipped With:
•Swept Blade Turbofan Propellers
•Dual Aft Body Strakes
•Increased Gross Weight
•PT6A-28 Engines
Revision IR: August 15, 2017 5-7
Document No. 16-206CGW-28
Section V – Performance

BEECHCRAFT King Air C90 Equipped With:
•Swept Blade Turbofan Propellers
•Dual Aft Body Strakes
•Increased Gross Weight
•PT6A-28 Engines
5-8 Revision IR: August 15, 2017
Document No. 16-206CGW-28

BEECHCRAFT King Air C90 Equipped With:
•Swept Blade Turbofan Propellers
•Dual Aft Body Strakes
•Increased Gross Weight
•PT6A-28 Engines
Revision IR: August 15, 2017 5-9
Document No. 16-206CGW-28
Section V – Performance