dispatch aircraft systems Flashcards
What is the engine designation, manufacturer and maximum thrust?
engine designation- CFM56-3b2 engine
manufacturer- CFM International
maximum thrust - 22,000
Aircraft dimensions:
length-
width-
height-
length- 119 ft 7in
width- 94ft 9in
height- 36ft 3in
number of passengers:
first class:
Coach:
first class: 8
Coach: 138
name three items as part of emergency equipment.
emergency slide fire extinguishers life raft megaphone emergency transponder
Provide the following weights:
Maximum ramp weight: Maximum TOGW: Maximum landing weight: Maximum ZFW: Maximum tailwind component for landing:
Maximum ramp weight: 144,000 Maximum TOGW: 143,500 Maximum landing weight: 121,000 Maximum ZFW: 113,000 Maximum tailwind component for landing: 15 kn structurally, although operational approval doesn't exceed 10 kns
List some of the locations on the aircraft where you find fire warning system.
a.
b.
c.
d.
a. lavatory
b. engines
c. wheel wells
d. APU
Describe the origins of bleed air and its common uses (all sources).
Bleed air is taken from the 5th and 9th stage of air compression from the engines. Bleed air is used for
anti-ice and air conditioning
If the wing tanks each contain 9000 pounds of fuel, how much fuel can be in the center tank?
0 pounds to less than 1000 lbs
Describe how the engines can be started when the aircraft is on the ground. Give some details about the energy sources. (2)
- APU start through the use of electrical power from the ac battery and fuel derived from the #1 engine. This results in creating bleed air in order to start the engines
- ground power unit bleed air
Give the approximate capacity of fuel:
Tank 1:
Tank 2:
Center Tank:
3 Tanks:
Tank 1: 10,643
Tank 2: 10,643
Center Tank: 16,422
In which tank do you find the fueling/de-fueling valve?
tank #2
What does the center tank scavenge pump do?
describe process and when the scavenger pump activates
When both center tank fuel pump switches are turned off, the fuel a scavenge shutoff valves opens. This allows fuel pressure from the main tank #1 forward pump to operate the center tank scavenge jet pump, which transfer the remaining center tank fuel to main #1 tank. The valve automatically closes after 20 mins.
The scavenger pump activates when there a 1000 pounds of fuel remaining in the center tank and transfers that fuel into the #1 tank
List at least five devices used by system A: a. b. c. d. e.
system A
a. #1 thrust reverser
b. inboard flight spoilers
c. alternate brakes
d. ground spoilers
e. autopilot a
What hydraulically powered items are still available if both Hydraulic System A and B should fail?
Thrust reversers, flap slats, leading edge devices, and rudder
can the APU fire bottle be used for the main engines fire suppression system?
no
What does the power transfer unit do? How does it operate?
The power transfer unit allows system A pressure to power a hydraulic motor, powering a pump and pressurizing system B fluid.
what is an electrical bus?
A group of electrical systems that are powered by the same system
What is the aircraft battery used for?
DC standby bus
What does a Transformer-Rectifier do?
Turns 115v AC power into 28V DC power
What is the function and limitation of the Generator Drive Disconnect?
The generator drive disconnect separates the generator from the engine in case of a malfunction
what two ways can you steer the aircraft on the aircraft?
- rudder pedal allows for for 7 degrees
- below 60kn left side of cockpit has a wheel on captain side to steer using the wheel
What are the Primary devices? Are they supported by both A and B systems?
Alerions, elevators and rudder. primary is supported by both A and B system
What are the secondary devices?
Leading edge flaps, leading edge slats, spoilers, trailing edge flaps and balance tabs
What are the purpose of flight spoilers? How can they be operated?
Destroys lift critical to flight. Both manually and automatic landing mode
How is Anti-icing made possible?
through electrically heated elements and thermally heated elements in part of the bleed air system.
What items on the aircraft use thermal heating?
The engine lip and slats run hot air to prevent ice build
What items on the aircraft use electrical heating?
Temp probs, pitot tube, angle of attack and windshield in cockpit.
define there abbreviations
V1
VR
Ll
V2
V1 take off decision speed where you can stop and
abort takeoff
VR nose gear is off the ground begin rotation
Ll main gear off
V2 engine take off speed
In the event there is a fire detected in the wheel well, How to you put out the fire?
Dropping down the landing gear
Explain the cooling process in 6 steps
- bleed air passes through the primary heat exchanger.
- the air then travels to the compressor section of the air cycle machine, where the air temperature is increased.
- next the air travels to a secondary heat exchanger to for additional cooling
- The air then go through a high pressure water separator and into the turbine section of the air machine, where expansion and final cooling occurs.
- The processed air is now joined with hot air that has bypassed the air cycle machine through the pack temp control valve.
- The preconditioned air then travels back through the high pressure water separator and into the mix manifold and distribution center.
Which fuel tank feeds the APU?
Hint :with AC operative and inoperative
When the AC fuel pumps are operative the APU is fed through the left side fuel manifold.
If the AC fuel pumps not operating, fuel is suction fed from the main #1 tank
What is a constant speed drive?
What is CSD purpose?
- constant speed drive is a mechanical gear box that take the input shaft rotating at a wide range of speeds, delivering this power to an output shaft at a constant speed, despite the varying input.
- There purpose is to drive mechanisms ie: electrical generators that require a constant input speed. They also supply accessory equipment
APU generator
Is a AC electrical generator, which may be used as an auxiliary AC power source.
What are the Primary devices? Are they supported by both A and B systems?
Ailerons, elevators and rudder. primary is supported by both A and B system
where is the external air ground unit placed on the aircraft and how does the air travel to the main cabin?
air enters the air conditioning system through the mix manifold and is routed to the cabin distribution ducts
where is the external air ground unit placed on the aircraft and how does the air travel to the main cabin?
The external air ground unit is connected to the preconditioned air connection
the air will then go through the air conditioning system through the mix manifold and is routed to the cabin distribution ducts.
how many wheels have brakes?
4 wheels
purpose of anti skid system
what does it do?
In depth process?
other amenities given included in the system
The anti skid system controls the amount of hydraulic pressure applied to the brakes when tire skidding occurs during manual or automatic braking.
The installment of anti skid, skid detectors sense the rate of deceleration in the wheel, it senses the coefficient of friction of the runway. In modifying the correct amount of pressures to the brakes the anti skid system can give the maximum allowable braking effort for the condition of the runway.
This system also provides locked wheel, touchdown, and hydroplane protection
What are the components of the hydraulic standby system?
What is it used for?
Standby system operated only by motor pump.
supply functions rudders, thrust reversers and leading edge devices in the event that system A, B or both fail
Define Class A, B and C fires
Class A: combustable materials- paper, wood, fabric, rubber, plastics
Class B: flammable liquids- gasoline, oils , greases, solvents, paints, burning liquids
Class C: live electrical- fire started by short circuit or faulty wiring in electrical equipment, switches, fire in motors
What extinguisher is applicable to Class A, B and C fires?
class A- Type A water (H2o)
Class B- BCF (Halon 1211)
Class C- BCF (Halon 1211)
What is the purpose of the cross feed valve?
What does the valve run off of?
The cross feed valve allow fuel to be transferred to either or both engines with the help of the electrical boost pumps. Having the engine fuel manifold interconnected with the cross feed valves allows for the fuel to flow through the valve directing it to whichever tank into the respected engine or engines.
The valve runs off a DC motor generated by the battery bus
What conditions you are required to do overfueling of the wing?
Provides over the wing fueling over the #1 and #2 fuel tanks in the absence of underwing pressure fueling facilities.
The only way to transfer fuel to the center tank is bleeding the #1 tank as a back up method
In relation to the fire protection system how many loops are there and where are they located?
6 total loops 2 loops in each engine 1 loop in the APU 1 loop in the Wheel Well Cargo might have a loop or smoke dectector
What areas consist of freon extinguisher bottles and how many?
APU: 1
Engine: 2
cargo compartment: possibly 1
What is the max take off thrust for the engines?
How many settings?
22,000
2 settings 20,000 and 22,000
Max differential pressure
8.65 psi
At 37,000 feet what will the cabin altitude be at?
8,000 feet
what is the min pressure at T/o and landing?
.125 psi
Max lateral fuel imbalance between tanks 1 and 2,
must be scheduled to zero. Random fuel imbalance must not exceed 1,000 pounds for taxi, t/o or landing
Where is the location of the 2 recirculation fans?
Forward cargo compartments
Where is the location of
flash lights, life vest, exit sign
flash lights: 2 forward, 3 aft
Life vest: under each pax seat, 1 for each crew member spot
exit slide 2fwd, 2 aft
how many of each electrical system component : generators battery transformer rectifiers inverter generator buses main buses dc buses transfer buses battery charger hot battery bus
3 generators: 115v ac to 400hz 2 main engine and 1 apu 1 battery- 28v 3 transformer rectifiers 115v ac to 28v dc 1 inverter 28v dc to 115v ac 2 generator buses 2 main buses 2dc buses 2 transfer buses 1 battery charger 1 hot battery bus
How many different type of components are serve the electrical system ? What are they
10
What converts AC to DC?
transformer rectifier
What sources provide hydraulic power?
System A, B, and standby
What powers system A pressure and electric pump?
the pressure for system a is provided by the #1 engine and the electric pump is powered by the #2 generator
What powers system B pressure and electric pump?
the pressure for system a is provided by the #2 engine and the electric pump is powered by the #1 generator
What is the normal operating pressure for each hydraulic pump?
3,000 psi
How does the standby system operate?
standby pressure is provided by one electric driven motor pump
What ensures positive fluid flow to all hydraulic pumps?
System A and b?
standby system?
pressurization of all three reservoirs.
For example:
Each system has a fluid reservoirs located in the wheel well area.
system A and B reservoirs are pressurized by air from the pneumatic manifold.
standby receives pressurization and fluid maintained to stay at the full level by a interconnecting balance line line to the system b reservoir.
What is the purpose of a PTU?
A power transfer unit provides an alternate source of hydraulic pressure to insure operation of the auto slat system, leading edge flaps, and slates, if required.
When would the PTU valve open?
the PTU valve will open should system B engine driven pump begin to lose pressurization below limits when airborne with the flaps less than 15 but not up. System A pressure drives a hydraulic motor, which in turn drives a pump, pressurizing system B fluid
What is the purpose of the LTU?
The landing gear transfer unit can be pressurized using the system B pressure in the event of a loss to the #1 engine.
What is the purpose of the LTU?
The landing gear transfer unit can be pressurized using the system B pressure in the event of a loss to the #1 engine. The landing gear normally operated off system A
From which fuel tank do you feed the APU fuel from?
1 tank
List at least five devices used by system B: a. b. c. d. e.
a. #2 right thrust reversers
b. leading edge flaps and slats
c. auto slats
d. elevator and elevator feel computer
e. autopilot B
Describe the sources of electrical power
Primary electrical power is from the two engine generators, They produce 115v AC current. Each engine generator powers its own electrical bus. The APU generates the same amount of electricity as one engine generator and can power both busses on the ground and one bus in flight. There is also a battery back up that powers the standby systems.
Thermal and Electrical anti ice components
Thermal: engine bleed air thermally heats the wings leading edge slats and engine cowl lip
Electrical: cockpit windows, probes and static ports: pitot- static probe, total air temp prob, angle airflow sensors
Operating limitations: Runway slope Max operating altitude max takeoff and landing altitude Max flt operating latitude
Runway slope = +/- 2 %
Max operating altitude= 37,000 ft
max takeoff and landing altitude = 8,400 ft pressure
altitude
Max flt operating latitude= 73 degrees north and 60
degrees south
3 sources of hot air
- bleed air from stage 5 and 9 from engines
- pneumatic ground source
- APU
Cooling cycle (the processing of hot air)
bleed air enters the cooling cycle through the primary heat exchanger, air is then routed to the compressor section of the air cycle machine where the temp increases. The air then proceeds to the second heat exchanger where the air is cooled down prior to traveling up to the high pressure water separator. The air than travels to the turbine section of the air cycle machine to final expansion and cooling occurs. It during that time where hot air joins the processed cold air as it has bypassed the air cycle machine through the use of the temp pack control valve. The conditioned air now travels back up through the high pressure water separator and final dumped into the mixed manifold and distribution system.
