BELL 412 TECH EXAM QUESTIONS WITH CORRECT ANSWERS LATEST UPDATE 2026
Max Gross weight - Answers 11,900 lbs
During Normal Fuel system Operation Which Component seprates the two fuel systems. - Answers
Cross Feed Valve
The Fuel Valve Caution lights can be refered to as... - Answers Agree/Disagreement Lights
What Does fluctuating fuel pressure and flashing Fuel Boost caution light indicate during the cross
feed check? - Answers Check Valve Malfuction
What is the purpose of the ejector pumps? - Answers To empty fuel from the mid cells.
What is the purpose of the fuel transfer pumps? - Answers 1. To keep the fuel boost pumps supplied
with fuel.
2. To provide the operating force for the ejector pumps.
3. To transfer fuel to control fuel burn sequance.
How are the ejector pumps activated? - Answers By transfer pump pressure, using the venturi
principle.
What is the purpose of the fuel inerconnect valve? - Answers To equelise fuel when total main fuel is
low.
To allow access to the main fuel cell by using the remaining boost pump, if one boost pump fails.
What is the purpose of the Standpipes in the upper centre cell? - Answers 1. To drain fuel to the main
under floor fuel cells.
2. To sequance fuel from the upper cells.
3. To reduce the time it takes to refuel the helicopter.
What is the purpose of the thermistors in the upper fuel cells? - Answers 1. To shut off the fuel
transfer pumps
2. To automatically open the interconnect valve.
What type of fuel quantity indicating system is used on the Bell 412? - Answers DC Powered
Capacitance.
If the fuel pump fails, how can unusable fuel be determined? - Answers Using the Fuel quantity
selector switch.
Why should the Fuel Cross Feed switch be placed to Over Ride Closed during an emergency engine
shutdown? - Answers To Prevent automatic oening of the cross feed valve.
How is the loss of electrical power to a fuel indicating system indicated? - Answers Fuel quantity
needle drops to zero.
What components assist in the controlling of the fuel burn sequence? - Answers Transfer Pumps,
Standpipes, Ejector Pumps
State the primary type and source of electrical power in the Bell 412 - Answers 28VDC from two
starter Generators.
Which electrical buses distribute DC power? - Answers No.1 and No.2 Main/Essential/Non-essential &
Emergency buses.
(8 in total)
What is the purpose of the EMERG LOAD switch on SN33108 and susequent models? - Answers Load
shedding in the event of a dual generator failure.
What is displayed on the DC voltmeters? - Answers No.1 & No.2 essential DC bus voltage
What does the dual ammeter indicate? - Answers amperage load on each generator.
When will the non essential bus be automatically powered? - Answers Only when both generators are
on line.
When starting both engines using external power, which Battery Bus switches must be on? - Answers
Both the No.1 and No.2 Bus
What does the illumination of the External Power Caution panel light indicate? - Answers The eternal
power door is open.
, Below what voltage is the use of external power recommended in the checklist? - Answers 20V
What is the min. recommended N1 RPM to be attained before turning a generator on? - Answers 71%
N1
What does the illumination of the DC GEN Caution panel light indicate? - Answers The generator relay
is open and the generator is not online.
What does the illumination of the GEN OVHT caution light indicate? - Answers The generator cooling
light is too hot.
What is the source of AC electrical power in the Bell 412 - Answers Two solid state inverters powered
by the airframe DC Power.
Which AC elctrical buses are lost if one inverter fails? - Answers No AC bus will be lost
How are the No.1 and No.2 hydraulic pumps driven? - Answers Mechanically by the main
transmission.
No. 1 on the RHS
No. 2 on the Front
How is the electrical solenoid valve controlled? - Answers By the associated HYD SYS switch on the
centre pedestal and the other system pressure switch.
How does the loss of pressure in one hydraulic system affect the other hydraulic system? - Answers
(Fail Safe system) The remaining system can not be switched off.
How would a pilot check if any of the Hydraulic filters are clogged? - Answers From the remot
indicator in the pilots chin window.
What is the approx. hydraulic fluid operating temperature difference between the No.1 and No.2
system. - Answers No 2 System operates approx. 15 Degrees hotter.
The number two system is shorter and does not supply the tail rotor servo.
What is the purpose of the Hydraulic Temp Switch? What Temp does it activate? - Answers To
illuminate the HYD Caution light at 88 degrees.
Which flight control servo is operated by only the number one system? - Answers Tail rotor (anti
torque)
Why is it important that the helicopter land ASAP if the Number 1 Hydraulic system fails? - Answers
The helicopter becomes uncontrollable if the second hydraulic fails.
When should the rotor brake be applied? - Answers Only below 40% NR after Engine shutdown.
What condition illuminates the rotor break light? - Answers Movement of the break pads out of the
retraced position.
What device allows servos of a failed hyd system to function without interfering with the operating
system? - Answers The failed system bypass.
The primary purpose of the Gas producer N1 section is to drive the? - Answers Power Turbine N2
section
What components are mounted on the N1 Accessory section - Answers The starter Generator, Fuel
control unit, and the Tacho Gen.
What does the overall combining gearbox do? - Answers 1. Reduces N2 RPM
2. Combines both engines power output
3. Mounts and drives various N2 and combing Gearbox accessories.
How many sections are there for the combing gearbox - Answers Three sections, two for gear
reduction and one for combining.
What Does the N1 Tachometer Generator do? - Answers Send a signal to the N1 Gauge
Actuate each Engines "Engine Out" Warning light
And the Particle Seperator System
ITT Indications are... - Answers Self Generating but require correction of the ITT compensation unit.
Transmission TQ on the 412/412SP is displayed on the dual TQ meter by? - Answers Combing engine
TQ signals with the dual torque meter.
Max Gross weight - Answers 11,900 lbs
During Normal Fuel system Operation Which Component seprates the two fuel systems. - Answers
Cross Feed Valve
The Fuel Valve Caution lights can be refered to as... - Answers Agree/Disagreement Lights
What Does fluctuating fuel pressure and flashing Fuel Boost caution light indicate during the cross
feed check? - Answers Check Valve Malfuction
What is the purpose of the ejector pumps? - Answers To empty fuel from the mid cells.
What is the purpose of the fuel transfer pumps? - Answers 1. To keep the fuel boost pumps supplied
with fuel.
2. To provide the operating force for the ejector pumps.
3. To transfer fuel to control fuel burn sequance.
How are the ejector pumps activated? - Answers By transfer pump pressure, using the venturi
principle.
What is the purpose of the fuel inerconnect valve? - Answers To equelise fuel when total main fuel is
low.
To allow access to the main fuel cell by using the remaining boost pump, if one boost pump fails.
What is the purpose of the Standpipes in the upper centre cell? - Answers 1. To drain fuel to the main
under floor fuel cells.
2. To sequance fuel from the upper cells.
3. To reduce the time it takes to refuel the helicopter.
What is the purpose of the thermistors in the upper fuel cells? - Answers 1. To shut off the fuel
transfer pumps
2. To automatically open the interconnect valve.
What type of fuel quantity indicating system is used on the Bell 412? - Answers DC Powered
Capacitance.
If the fuel pump fails, how can unusable fuel be determined? - Answers Using the Fuel quantity
selector switch.
Why should the Fuel Cross Feed switch be placed to Over Ride Closed during an emergency engine
shutdown? - Answers To Prevent automatic oening of the cross feed valve.
How is the loss of electrical power to a fuel indicating system indicated? - Answers Fuel quantity
needle drops to zero.
What components assist in the controlling of the fuel burn sequence? - Answers Transfer Pumps,
Standpipes, Ejector Pumps
State the primary type and source of electrical power in the Bell 412 - Answers 28VDC from two
starter Generators.
Which electrical buses distribute DC power? - Answers No.1 and No.2 Main/Essential/Non-essential &
Emergency buses.
(8 in total)
What is the purpose of the EMERG LOAD switch on SN33108 and susequent models? - Answers Load
shedding in the event of a dual generator failure.
What is displayed on the DC voltmeters? - Answers No.1 & No.2 essential DC bus voltage
What does the dual ammeter indicate? - Answers amperage load on each generator.
When will the non essential bus be automatically powered? - Answers Only when both generators are
on line.
When starting both engines using external power, which Battery Bus switches must be on? - Answers
Both the No.1 and No.2 Bus
What does the illumination of the External Power Caution panel light indicate? - Answers The eternal
power door is open.
, Below what voltage is the use of external power recommended in the checklist? - Answers 20V
What is the min. recommended N1 RPM to be attained before turning a generator on? - Answers 71%
N1
What does the illumination of the DC GEN Caution panel light indicate? - Answers The generator relay
is open and the generator is not online.
What does the illumination of the GEN OVHT caution light indicate? - Answers The generator cooling
light is too hot.
What is the source of AC electrical power in the Bell 412 - Answers Two solid state inverters powered
by the airframe DC Power.
Which AC elctrical buses are lost if one inverter fails? - Answers No AC bus will be lost
How are the No.1 and No.2 hydraulic pumps driven? - Answers Mechanically by the main
transmission.
No. 1 on the RHS
No. 2 on the Front
How is the electrical solenoid valve controlled? - Answers By the associated HYD SYS switch on the
centre pedestal and the other system pressure switch.
How does the loss of pressure in one hydraulic system affect the other hydraulic system? - Answers
(Fail Safe system) The remaining system can not be switched off.
How would a pilot check if any of the Hydraulic filters are clogged? - Answers From the remot
indicator in the pilots chin window.
What is the approx. hydraulic fluid operating temperature difference between the No.1 and No.2
system. - Answers No 2 System operates approx. 15 Degrees hotter.
The number two system is shorter and does not supply the tail rotor servo.
What is the purpose of the Hydraulic Temp Switch? What Temp does it activate? - Answers To
illuminate the HYD Caution light at 88 degrees.
Which flight control servo is operated by only the number one system? - Answers Tail rotor (anti
torque)
Why is it important that the helicopter land ASAP if the Number 1 Hydraulic system fails? - Answers
The helicopter becomes uncontrollable if the second hydraulic fails.
When should the rotor brake be applied? - Answers Only below 40% NR after Engine shutdown.
What condition illuminates the rotor break light? - Answers Movement of the break pads out of the
retraced position.
What device allows servos of a failed hyd system to function without interfering with the operating
system? - Answers The failed system bypass.
The primary purpose of the Gas producer N1 section is to drive the? - Answers Power Turbine N2
section
What components are mounted on the N1 Accessory section - Answers The starter Generator, Fuel
control unit, and the Tacho Gen.
What does the overall combining gearbox do? - Answers 1. Reduces N2 RPM
2. Combines both engines power output
3. Mounts and drives various N2 and combing Gearbox accessories.
How many sections are there for the combing gearbox - Answers Three sections, two for gear
reduction and one for combining.
What Does the N1 Tachometer Generator do? - Answers Send a signal to the N1 Gauge
Actuate each Engines "Engine Out" Warning light
And the Particle Seperator System
ITT Indications are... - Answers Self Generating but require correction of the ITT compensation unit.
Transmission TQ on the 412/412SP is displayed on the dual TQ meter by? - Answers Combing engine
TQ signals with the dual torque meter.
