Beechcraft Super King Air 350

The Beechcraft Super King Air 350 is a commuter category part 23 certified twin turboprop capable of carrying 8 to 12 passengers comfortably.  The aft portion of the cabin has an enclosed potty and a baggage area capable of handling 550 lbs of bags. It cruises at 310 kts and has a range of 1,700 nm. This capable twin has a max takeoff weight of 15,000 lbs which means that unlike the king air 200 a 350 captain must be type rated in the aircraft. With a nine passenger seat configuration you can carry nine passengers and a full load of fuel. At max takeoff weight, at sea level, on a 30o C day, with flaps  up, bleed air open and air-conditioning on the takeoff distance is 5,015 ft. Under the same conditions with the flaps at approach the takeoff distance is 4,187 ft. selected limitations, specifications, and info are listed below.

King Air 350 Study Guide

Engines                                                PT6A-60A
Engine shaft horsepower                    1050 SHP
N1 compressor
Max T.O./Continuous/Transient                   104%
Min idle                                                          62%
N2 propeller
Min idle                                                     1050 rpm
Max T.O./Climb/Cruise/Continuous         1700 rpm
Transient                                                  1735 rpm(7 min)
Transient                                                  1870 rpm(20 sec)
Max revers                                               1650 rpm
Max Start                                                  1000 C(5 sec)
Max Idle                                                      750 C
Max TO, continuous, cruise                       820 C
Max climb                                                   785 C
Transient                                                    850 C(20 sec)
Max                                                              100%
Transient                                                     102% (7 min)
Transient                                                     156% (20 sec)
Oil pressure
Min Idle                                                          60 psi
Min TO/Climb/Cruise/Cont                           90 psi
Max                                                             135 psi
Transient                                                     200 psi
Oil temp
Min start                                                       -40 C
Max Take off/continuous/transient           0-110 C
99-110 C limited to 10 minutes

Total oil each engine                        14 quarts/3.5 gallons
Operating range                    Max to 4 quarts low on dipstick

Usable fuel
Maximum usable fuel                                      3611 lbs/539 gal
Main fuel system                                             2546 lbs/380 gal
Auxiliary fuel system                                       1065 lbs/159 gal
Each main fuel tank system                           1273 lbs/190 gal
Each Auxiliary tank                                          533 lbs/79 gal
Max fuel imbalance                                         300 lbs

Cross feeding only approved with one engine inoperative

Takeoff with less than 265 in each wing or fuel gauges in yellow arc prohibited

Approved fuels
Jet A, Jet A-1, Jet B, JP-4, JP-5, JP-8
(Only one standby pump required)
Emergency fuels
80 RED, 91/96, 100LL Blue,100 Green 115/145 Purple
Limitations on use of Aviation gasoline
150 hours between engine overhauls
Both standby pumps must be operative
Must be able to cross feed above 20,000 ft

Maximum Ramp Weight                                  15,100 lbs
Maximum Take-off Weight                               15,000 lbs
Maximum Landing Weight                               15,000 lbs
Maximum Zero Fuel Weight                             12,500 lbs
Maximum Baggage compartment Weight        550 lbs / 510 lbs with fold up seats

Maneuvering Speed VA                                    184 KIAS
Max flaps Extension/Extended VFE
Approach                          202 KIAS
Full Down                         158 KIAS
Max Landing Gear Operating Speed    VLO
Extension                         184 KIAS
Retraction                        166 KIAS
Max landing Gear Extended VLE                 184 KIAS
Air Minimum Control Speed VMCA
Flaps Up                                        94 KIAS
Flaps Approach                            93 KIAS
Max Operating Speed VMO
Sea Level to 21,000 feet                263 KIAS
21,000 to 35,000 feet                     263-194 KIAS (.58 Mach)
Red Line VMCA                             94 KIAS
White Arc (full flap operating range)                81 to 158 KIAS
Wide White Arc (stall speeds)                         81 to 96 KIAS
81 is VSO stall speed at max wt. flaps down and idle power
96 is VS stall speed at max wt. flaps up and idle power
White Triangle (max speed approach flaps)            202 KIAS
Blue Line (single engine best rate of climb)            125 KIAS
Max demonstrated crosswind                    20 Kts
VX                                     125 Kts
VY                                     140 kts
VYSE                                125 Kts
VXSE                                125 Kts
Intentional one engine inoperative                110 kts
Turbulent air penetration speed                    170 Kts
Max glide                            135 Kts
Emergency descent                        184 Kts
Minimum Airspeed for sustained icing in flight        140 Kts
Max airspeed for effective windshield deicing        226 Kts

External power limits    28-28.4v, 300amps continuous/1000 amps momentarily

Generators    Inflight        sea level to 34,000 ft        100%
Above 34,000 ft        95%
Ground     62% to 70% N1        75%
70% to 100% N1        100%

Starter Limits                        30 sec ON, 5 min OFF
30 sec ON, 5 min OFF
30 sec ON, 30 min OFF

Rudder Boost must be operational for all flights

Yaw damp is required above 5,000 ft. If dual strakes are installed yaw damp must be operational above 19,000 ft

Prop speed of 1768 indicates failure of the primary governor. Limit torque to 96% and flight may be continued.

Over speed governor limits speed to 1768 rpm by dumping oil from the prop

Fuel topping governor limits prop to 106% of selected rpm, also limits reverse to 95% n1

Speeds above 1768 rpm indicate primary and over speed governor failure

Auto feather must be operational for takeoff, climb, approach and landing.
Both power levers must be above 90% N1
If torque drops below 17% the other side disarms
If torque drops below 10% the prop feathers

Pneumatic pressure normal operating range 12-20 psi

Auto ignition activates at 17% torque

AC compressor is on the right engine, automatically cuts out if
Refrigerant pressure too high or low
Ambient temp below 10oC
Right engine below 62% N1

Electric heat – for ground use only
Temperature controller must be in manual heat
Both forward and aft blowers must be on
Electric heat light must out before turning off blowers

Landing gear warning horn activates and the gear handle illuminates red when
Flaps up or approach, Power below 85% N1 and gear not down. Can be cancelled
Flaps beyond approach and gear not down. Cannot be cancelled
On the ground with the handle in the up position

Cabin pressure switch –DUMP- dumps cabin with a limit of 13,500 ft cabin altitude

Lead acid battery installed

BAT BUS switch – opens a RCCB between the battery bus and the battery (isolates the battery)
Battery switch – closes the battery relay and the battery bus tie to power the triple fed and center busses

BATTERY CHARGE Illuminates at 7.5 amps. Extinguishes at 6 amps

Flight idle low pitch stop – is a mechanically activated hydraulic stop. Set on ground as power climbs above 68-70% N1 and L/R PROP PITCH extinguishes

Ground idle low pitch stop – electrically actuated solenoid set at 10o below the flight idle pitch stop. The right squat switch depowers the stop at lift off

If in flight the solenoid receives power for more than 10 seconds PROP GND SOL illuminates – pulling the PROP GOV TEST circuit breaker depowers the solenoid – the light is inhibited on the ground by the left squat switch

L/R PROP PITCH – indicates the prop is more than 8o below the flight idle pitch stop

Compressor bleed valve – a pneumatic piston that ports P2.5 Air to prevent compressor stalls

Jet flap – vents P2.5 Air through a variable slot in each hollow strut that connects the accessory section to the compressor this produces a swirl effect for air entering the compressor, to improve low speed compressor characteristics.

Hot battery bus lights- entry way lights, baggage light, emergency lights

10,000 ft  CABIN ALTITUDE illuminates

12,000 ft  CABIN ALT HI illuminates

12,500 ft passenger oxygen mask deploy

13,500 cabin dumb switch limit

L/R FUEL QTY 300 lbs less than 30 minutes remaining at max continuous power

Max cabin pressurization differential 6.6 psi, CABIN DIF HI at 6.9 psi

Aircraft length        46’ 8”
Height            14’ 4”
Wingspan        57’ 11”

Battery Bus
Battery relay
Battery bus tie
Ground Comm
Cabin entry lights
Digital clocks
Door lock lights
Instrument emergency lights
Engine Fire extinguisher L/R

Emergency Bus
Pilot ADI
Pilot HIS
Nav 1
Comm 1
glideslope 1
compass 2
marker beacon 1
radio relays

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  1. Pingback: Stormy Day Takeoff, King Air 350 – JetVideos

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