104 terms

Bell 206B/206LR

Max gross weight - internal, external, float gear, doors off (206B)
Internal: 3200
External: 3350
Float Gear: 3000
Doors Off: 3200
Maximum Gross Weight for a 206LR
4,000 lbs
Minimum weight in pilots seat (206B2 / 206B3 / 206LR)
B3 & L: 170 lbs B: 150 lbs / 200 lbs with range extenders
VNE for a 206LR?
150 mph to 3,000 ft. DALT then decrease in accordance with Limitation Placard
What is the VNE 3000 lbs gross weight and below? (206B)
VNE 150 MPH sea level to 3000 ft DALT.
Decrease by 4 MPH per 1000 ft above 3000 ft DALT.
What is the VNE above 3000 lbs gross weight? (206B)
VNE 140 MPH sea level to 3000 ft DALT.
Decrease by 8 MPH per 1000 ft above 3000 ft DALT.
Airspeed limit with float gear (206B/LR)
120 MPH, drop by 5 MPH every 1000 ft. over 3000 ft. DALT
What is the autorotation VNE? (206B/LR)
115 mph marked by a blue line
What is the airspeed limit with the bubble window? (206B/LR)
110 MPH
Doors Off VNE for a 206LR?
100 mph
VNE with External Loads (206B/LR)
91 mph
VNE w/ aft doors off (206B)
100 MPH
Airspeed limit for torque between 85 and 100%? (206B/206LR)
92 MPH
VNE w/ forward doors off? (206B)
80 MPH
Max Operating Altitude (206LR)
20,000 ft. PALT
Max operating altitude 3000 lbs and below (206B)
20,000 ft. PALT
Maximum Altitude with Fixed Floats (206B/LR)
15,000 ft. PAL
Max operating altitude above 3000lbs (206B)
13,500 DALT
The system is designed to operate without boost pumps up to what altitude? (206B)
6000' PALT
Power on Rotor (NR) Limitations for a 206B2?
Maximum: 100% all gross weights

Minimum: 97% for gross weights above 3000 lbs (Transient: 95%, 5 seconds)

Minimum: 95% for gross weights 3000 lbs and below

Accelerate through 50-60%
What are the Gas Producer RPM (N1) limitations for a 206B2?
Transient: 105% for 15 seconds
Maximum: 104% RPM
Min/Max for GOV on: 70%
Idle Speed: 60-62%
Max Starter Engage: 58%
Abort Start if rotor not rotating: 25%
Power Turbine (N2) limitations for a 206B2
Transient: 105% for 15 seconds
Maximum: 100%
Governor Range: 95-100%
Minimum: 97% - above 8000 ft or GVW over 3,000 lbs
Minimum: 95% - below 8000 ft or GVW 3,000 lbs and below

Steady-state operation: 75 to 88% N2 and engine torque greater than 33% is prohibited. Transient operation through this range is permissible.
TOT limits for the 206B2?
Max Start-Up: 810 to 927 for 10 seconds
Transient: 793 to 843 for 6 seconds
Max Take-Off: 793 C for 5 Minutes
Max continuous: 737 C

Exceeding 793 C may cause N1 topping with resultant rotor droop
What are the Power off Rotor Limitations? (206B/LR)
Maximum: 107%
Minimum: 90%
Engine Torque Limitations (206B)
110% Transient (5 second max)
85 - 100% Max Take Off (5 Minute Max)
85% Max Continuous
25-30% Torque @ 100% N2 on Ground

Exceeding 100% may cause N1 topping with resultant rotor droop
What are the Rotor Limits (NR) for a 206B3?
Power ON: Max 100% Min 97% (95% Transient, 5 sec)
Note: accelerate trough 50% to 60% as rapidly as possible

Power OFF: Max 107% Min 90%
What are the Gas Producer (N1) limitations for a 206B3 / 206LR?
Transient: 106% for 15 seconds
Maximum: 105% RPM
Min/Max for GOV on: 70%
Idle Speed: 60-62%
Max Starter Engage: 58%
Abort Start if rotor not rotating: 25%
What are the Power Turbine (N2) LImits for a 206B3?
Transient: 105% for 15 seconds
Maximum: 100%
Governor Range: 95-100%
Minimum: 97%

Steady-state operation: 75 to 88% N2 and engine torque greater than 33% is prohibited. Transient operation through this range is permissible.
TOT limits for the 206B3 / 206LR?
Max Start-Up: 810 to 927 for 10 seconds
Transient: 810 to 843 C for 6 seconds
Max Take-Off: 810 C for 5 Minutes
Max continuous: 738 C

Exceeding 810 C may cause N1 topping with resultant rotor droop
Power On Rotor Limits (NR) for a 206LR?
Max: 100%
Min: 98%

Accelerate through 50-60%
Power Turbine (N2) Limitations for a 206LR?
Transient: 105% (15 sec)
Max: 100%
Min: 98%

Governor Range: 98 - 100%

Fuel Intro: Above 12%

Steady State ops prohibited between 75 - 88% N2, above 20% torque
Engine Torque Limits for a 206LR?
Transient: 105% (5 sec)
Take-Off: 100% (5 min)
Max Continuous: 88%
Fuel Capacity and fuel capacity with range extender for a 206LR
110 USG with range extender
98 USG
Fuel capacity and fuel capacity with range extender? (206B2)
96.7 USG with range extender
76 USG
What is the total fuel capacity and usable fuel capacity of a 206B3?
93 USG total
91 USG useable
Fuel Burn (206B/LR)
30 GPH
Unusable fuel when one or both boost pumps are inoperative? (206B)
10 USG
CHL Company Minimum Fuel
206B: 15 USG 206L: 115 lbs CHL: 30 min / Legal: 20 min
Engine oil pressure limits (206B/LR)
Below 78.5% N1: 50 - 90 psi
78.5 - 94.2% N1: 90 - 115 psi
above 94.2% N1: 115 - 130 psi
Engine oil temperature limits (206B/LR)
Max 107 C
Min 0 C
What is the engine oil capacity? (206B/LR)
5.5 US Quarts
Transmission oil pressure limits (206B/LR)
- Minimum: 30 psi
- Continuous: 30 - 50 psi
- Maximum: 70 psi
Transmission oil temperature limits (206B/LR)
Continuous: 15 - 110 C
Max: 110 C
Transmission Oil Capacity (206B/LR)
5.0 US quarts
Hydraulic reservoir oil capacity (206B/LR)
1.0 US Pint
Minimum oil pressure for torque meter to function correctly. (206B/LR)
115 psi
What is the maximum floor loading and weight allowed in the baggage compartment? (206B/LR)
86 lbs/sq.ft. and 250 lbs.
Maximum floor loading in the cabin? (206B/LR)
75 lbs/sq.ft.
What are the fuel pressure limits? (206B2 / 206B3 / 206LR)
- S/N 4-913: 8 to 50 psi
- S/N 4-913 plus modification: 4 to 50 psi
- B3: 4 to 30 psi
- LR: 4 to 25 psi
What are the fuel sample procedures? (206B/LR)
Fuel tank drain: Battery on, Fuel valve off, depress drain button.
Fuel filter drain: Battery on, Fuel valve on, Fuel boost pump circuit breakers in, Caution light circuit breaker in, fuel filter drain valve open drain sample then close the valve.
What are the engine starter runtime limits? (206BLR)
External Power
25 sec on
30 sec off
25 sec on
30 sec off
25 sec on

Internal Battery
40 sec on
60 sec off
40 sec on
60 sec off
40 sec on
Engine anti-ice Limits? (206B/LR)
Engine anti-ice must be on for flight in visible moisture in temperatures below 4.4'C
Max ambient temperature for anti-ice use is 4.4'C
What are the gas producer (N1) starting speed vs. outside air temperature speeds? (206B)
15% N1 rpm above 7'C
13% N1 rpm -18'C to 7'C
12% N1 rpm below -18'C
What are some reasons to abort the start? (206B2 / 206B3 / 206LR)
TOT is about to exceed 793'C to 927'C for 10 sec (810 to 927'C for B3)
(810 TO 927'C for LR)
Main rotor is not turning by 25% gas producer (N1)
What is the engine model for a Bell 206? (206B/LR)
Rolls-Royce / Allison Model 250-C20 Series
What are the procedures for an engine failure? (206B)
Reduce Collective IMMEDIATELY
Adjust pitch to maintain 90% to 107% rotor RPM
Reduce airspeed to 60mph to 80mph (max 115mph)
At low altitude, closed throttle flare to loose excessive airspeed
Apply collective to decrease forward airspeed and cushion landing
Make contact with ground with Min of 70% Nr
Battery RLY Light (206LR)
Battery wont Shut Off (Land if it becomes Hot)
What to do if you get a ROTOR LOW RPM light/Horn? (206B)
Rotor RPM is below normal (Collective off the stop, Nr under 90%)
Reduce collective and check throttle is full open
What to do is you get a TRANS CHIP Light? (206B)
Metal particles in transmission oil
Land as soon as possible
What to do if you get a T/R CHIP light? (206B)
Metal particles in tail rotor gear box
Land as soon as possible
What to do if you get an ENG CHIP Light? (206B)
Metallic particles in Engine Oil
Land as soon as possible
What to do if you get an ENG OUT Light? (206B)
Engine power failure (N1 less than 55%)
Reduce collective and investigate power failure. If necessary enter autorotation.
What does a FUEL LOW Light Mean? (206B)
Approximately 20 gal of fuel remaining
Land as soon as Practical
What does A/F FUEL FILTER Light mean? (206B)
Airframe fuel filter is clogged
Land as soon as Practical
Clean before next flight
What does FUEL FILTER Light mean? (206B)
Engine fuel filter is clogged
Land as soon as Practical
Clean before next flight
What does a FUEL PUMP Light mean? (206B)
One or both fuel pumps inoperative.
Descend below 6000 ft PALT
Land as soon as Practical
10 USG unusable fuel
What does a TRANS PRESS Light mean? (206B)
Transmission pressure is below minimum
Land as soon as Possible
What does TRANS TEMP Light mean? (206B)
Reduce power
Check transmission oil pressure
Land as soon as Possible
GEN FAIL Light (206B)
Generator has failed. GEN switch - RESET, then ON. If GEN FAIL light remains illuminated GEN switch - OFF. Land as soon as practical.
What are the two different types of emergency procedures?
Land as soon as Possible
Land without delay at nearest suitable area

Land as soon as Practical
Landing site and duration of flight are at the discretion of the pilot
Extended flight not recommended
Tail Rotor Control Failure: Complete Loss of Thrust Procedure (206B)
Reduce throttle to flight idle, immediately enter autorotation
Tail Rotor Control Failure: Fixed Pitch Failure Procedure (206B)
Depending on the pitch position of the tail rotor, at the time of failure, engine power and airspeed shall be varied as follows:
Power - Adjust as required to minimize excessive yawing.
Airspeed - Adjust to determine best velocity to minimize excessive yawing. (Min 58 MPH)
Left pedal is the power pedal, so if the nose goes left there's too much tail rotor power
Fuel Control and/or Governor Failure Procedure (206B)
Maintain RPM with collective pitch if engine undersides or with the throttle if it overspeeds Establish autorotative glide if power is very low or if engine must be shut down. Prepare for power-off landing
Hydraulic System Failure (206B)
Airspeed - 70 to 80 MPH
HYD BOOST circuit breaker - Out, if power is not restored - In.
CONTROL BOOST or HYDRAULIC SYSTEM switch -ON, OFF if power is not restored.
Land as soon as practical and investigate.
A run-on landing at 12 to 17 MPH is recommended. Maintain airspeed above translational lift speed for best control at touch down.
Electrical Power Failure Procedure (206B)
Gen Fail Light - Illuminated Cycle generator switch - If power is not restored - OFF. All electrical equipment - OFF (to conserve battery). Required electrical equipment - ON, only as needed. Warning: Reduce altitude to below 6000 feet.

heaters, fans and lights draw the most power
Engine Fire During Starting or Shutdown (206B)
Starter - Continue to motor the engine. Throttle - Full closed. FUEL VALVE switch - OFF. IGN ENG circuit breaker - Out. Complete shutdown.
Engine Fire During Flight (206B)
Throttle - Close. Immediately enter autorotation. Fuel valve switch - OFF. Battery switch - OFF. Generator switch - OFF. Execute autorotational descent and landing.
Engine Air Start Procedures (206B)
When cause of the engine failure is believed to be mechanical, do not attempt a restart. Collective - 90 to 107% Nr. Airspeed - 58 to 69 MPH. Generator - OFF. Perform normal engine start procedure. WARNING: Do not attempt air start above 12,000 feet,(TOT rises too fast to control.)
Cabin Ventilation Procedure (206B)
Vent - Open Cabin Windows - Open for maximum ventilation
Driveshaft Failure Procedure (206B)
Indication of a transmission to engine driveshaft failure is a left yaw, rapid decrease of rotor RPM with a ROTOR LOW light, accompanied by an increase of power turbine RPM. Noise level may increase due to overspeeding engine and driveshaft breakage. Collective pitch - Adjust to maintain rotor RPM, 90 to 107 % Airspeed - 52 to 69 MPH. Throttle - Open (engine is providing power to tail rotor). Complete autorotative landing and helicopter shut down
60MPH & 90% Nr
80MPH & 90% Nr
Best Rate of Climb (Vy) (206B/LR)
55-60 MPH
OAT Limits (206B/LR)
51 C - Max Operating Limit
4.4 C - Anti Ice in visible moisture
-17.8 C - Without Red Triangle (Jet A)
-32 C - With Red Triangle (Jet A)
-40 C - Min Operating Limit (Jet II & 254 Oil)
-45 C - CHL Company Minimum
-65 C - Min Operating Limit (Jet B & 2389 Oil)
Describe the Fuel System (206B)
A single bladder fuel cell behind the passenger seat. Within the fuel cell are two electrically operated boost pumps, lower and upper indicating units and sump drain valve. The boost pumps are interconnected and supply fuel through a single hose assembly to the fuel shut-off valve and from the shut-off valve through the airframe mounted filter to the engine mounted fuel filter/pump. The engine fuel system consists of an engine driven fuel pump, a gas producer(N1) fuel control, a power turbine(N2) governor, a fuel nozzle, and a burner drain valve. The boost pumps incorporate pressure switches in the discharge ports and drain plugs in the pump drain port. The fuel cell is filled from the right side and has a usable fuel capacity of 76 U.S. gallons (96.7 with Range Extender) B3: 93USG. Note: When the airframe mounted fuel filter is installed in the fuel system, the fuel supply does not require the addition of the anti-icing additive.
Describe the Electrical System (206B)
The 206 is equipped with a 28 volt direct current system. Power for this system is obtained from a 24 volt 13 ampere-hour battery and a 150 ampere (derated to 105 amperes) 30 volt combination starter-generator. All circuits are single wire with a common negative ground. Components of the system include the battery, the starter/generator, a voltage regulator, relays, switches and circuit breakers.
Describe the Hydraulic System (206B)
The hydraulic system consists of a hydraulic pump with integrated air-cooled reservoir driven by the transmission oil pump shaft, a solenoid valve, supply line filter which incorporates a red differential pressure indicator button that pops out to indicate an impending filter stoppage, three hydraulic servos, and associated "Fail Safe" electrical control components.
Describe the Power Plant (206B)
The design of the Allison 250 series engine is comprised of four major sections plus associated subsystems. An Axial-centrifugal-flow Compressor Section Two separate gear trains are housed inside the Accessory Gearbox Section, the gas producer (N1) and the power turbine (N2). A two-stage gas producer turbine and a two-stage power turbine in the Turbine Section And a Single Combustion Chamber in the Combustion Section All Producing 420 SHP derated to 317 SHP (270 SHP Continuous)
Describe the Accessory Gearbox Components (206B)
The gas producer (N1) gears drive the STOFF (Starter-generator, Tach-generator (N1), Oil pump, Fuel pump, and Fuel control.) The power turbine (N2) gears drive the PTTO (Power turbine governor, Tach-generator (N2), Torque meter, Output shaft.)
Describe the Engine Oil System (206B)
The engine lubrication system of the Allison 250-Series engine is a circulating dry sump type with a reservoir and single core cooler located in the upper aft fairing. Also a facet oil filter with bypass indication on the rear deck and an integrated oil pump/filter as well.
Describe the Transmission Driven Accessories (206B)
Transmission driven accessories include the transmission oil pump, the hydraulic pump and the rotor tach generator, all driven by a common shaft.
Describe the Main Gear Box (Transmission) Oil System (206B)
A self-contained system which includes a pump, filter with bypass, temperature and pressure monitoring, oil cooler, spray jets, relief valve, and magnetic chip detectors for contamination monitoring. Lubrication is also provided to the freewheeling unit, on the engine accessory gearbox.
Bell 206B2 vs. 206B3
Upgraded Allison 250-C20B or J engine with 2 inch larger tail rotor. Which equals differences in: N2 Limits (Minimum) N1 Limits (Max & Transient) TOT Limits (Max Continuious & Max Takeoff) Nr Power On Limits Loadmeter Limits Fuel Pressure Limits Fuel Capacity Oil Pressure Limits
A.B.C.D'S (206B/206L)
A - anti ice (check temp drop) B - beep range (test full range) C - control boost (hydraulic test) D - decel check (2 sec to 65% N1)
Pre-Start Checks (206B/206L)
Exterior / Interior - Check Seatbelts / Pedals - Adjust Controls - Free / Frictions ON Throttle - Cycle / Closed Turn & Bank - Off Auto relight - OFF Caution Light C/B - OUT Boost pump C/B's - OUT Overhead switches - OFF Anti-ice - OFF Map light - OFF ELT - AUTO Bleed air heater - OFF Landing lights - OFF Hydraulic switch - ON Radios - OFF Pulse light - OFF Instruments - Static check Altimeter - Set Fuel Valve - ON Battery - ON Auto relight - Check Caution / Warning systems - Check Boost pump C/B's - IN Boost pumps - ON,check pressure & lights
Engine Start and Run-Up (206B/206L)
Anti-collision light - ON Rotor & Area - Clear Engine - START Caution C/B - IN, check lights AFTER 1 MINUTE N1 - 70% Generator - ON (Loadmeter 0.5 or less) Overhead switches / breakers - As required Control frictions - OFF Bleed air heater - Check Landing lights - Check Preliminary HYD check Radios - ON, check 121.5 Instruments - Check Pulse light - ON Throttle - FULL (max 40% Q)
Pre Take-Off (206B/206L)
Throttle - FULL NR - 100% T's & P's - Check Fuel - Note quantity Caution lights - All OUT Flight instruments - SET Pulse lights - ON Switches & breakers - As required Skids - Clear
Hover Check (206B/206L)
C of G A rea - CLEAR S kids - CLEAR H ook - CLEAR - Power - Record
Pre-Landing (206B/206L)
Throttle - FULL NR - 100% T's & P's - Check Fuel - Note quantity Caution lights - All OUT Switches & breakers - As required
Shut Down Checks (206B/206L)
Throttle - Idle for 2 mins Control frictions - ON Unnecessary switches / radios - OFF Pulse light - OFF Anti-ice - OFF Landing lights - OFF ELT - Check 121.5 Radios - OFF Generator - OFF Caution C/B - OUT Throttle - Closed, monitor TOT N1 BELOW 10% Boost pumps - OFF Anti-collision light - OFF Battery - OFF Flight Plan - Closed
Max Tanis Kit Operating Temp
Aircraft Length (206B/206L)
43 Ft
Main Rotor Diameter. (206B/LR)
33 feet 4 inches
Autorotative Airspeed & Nr limits
60-80 mph & 90-107 %