final review dispatch Flashcards
How long can a dispatcher work for?
A dispatcher can not be scheduled for more than 10 consecutive hours.
Must a dispatcher stop working if he has reached his work limit?
no, if the airplane is still airborne.
How many dispatchers does an airline need?
enough to maintain enough operational control
What is an MEL/CDL?
minimum equipment list is broken items still installed on the airplane and not working. CDL is configuration deviation list that are missing items.
When do you need to amend a Flight Plan because of an MEL/CDL?
when the MEL and CDL effect the way the original flight plan was planned
How about an airplane light?
4 landing lights are equipped on the airplane. on the mel 3 out of 4 must be working. 1 can be inop with no penalities, but if the window heating goes out you might need to amend the flight because it can effect the flight.
What do you do if an airplane lands at an airport not listed in C-70?
implying that you diverted for some cause there is four items:
1. airport has to meet the aircraft requirements
2. take off performance has to be calculated for that runway
3. treat it like a regular airport. there is 3 documents airplane must take on every flight: a flight plan, dispatch release and weight and balance.
4. follow the published take off minimums for that airport.
If the take off minimums are not available, the crew has the option of using 800 ft ceiling 2miles, 900ft 1 1/2 miles or
1000 and 1 miles.
What is marginal?
marginal weather is determined by the airlines and Green River airlines is at minimums. not below or above
When do you need an take off alternate?
a take off alternate is needed when the weather at the departure airport is below landing minimums
What is the definition of suitable?
No set definition. Depends on you, an airport that meets part 139 standards like the regular provisional refueling. however suitable airport means whatever meets the needs of the flight.
Tell me about the 737-400? systems
119ft long 36ft high 94ft wing spand ramp weight 144,000 lbs . takeoff weight 143,500 landing weight 121,000 Zero fuel flight 113,000 empty weight 77,100
3 tanks: each main tank holds 10,000 lbs, center 16,000
max fl 370
max altitude t/o landing 8400 ft press altitude
max runway slope +/2 %
146 pax, min 2 crew , 3 flight attendants
max cabin differential pressure 8.65 for cabin alt 8,000 ft
t/o landing max differential pressure .125 for emergency to open door quickly
max northern latitude we can fly N 73, South latitude is S 60
Who makes the engines?
CFM division of snecma
Tell me about the fuel system? How many tanks? shutoff valves? cross feed purpose? where is fueling/defueling valve? scavenger pump? fuel filter can it be bypassed? over the wing fueling? How can you transfer fuel from tank to tank?
3 tanks mains over 10,000 each center 16,000
8 pumps: 2 engine driven, 6 AC or electrically driven pumps
2 shutoff valves
1 cross feed valve allows for defuel one tank and allows for cross feed of one tank to the opposite engine.
fuel temp and the apu is from the # 1 tank and the fueling/defueling valve is from the #2 tank.
The center tank must be empty first down to a 1,000 lbs and then the scavenger pump takes over and removes the remaining fuel into the #1 system. the engine driven pump are able to suction feed from the mains by themselves. the fuel filter can be bypassed if its plugged.
there is over the wing fueling from a ground operation in case you need to. the only way to transfer fuel from tank to tank is during the over wing fueling
Tell me about the hydraulic system?
3,000 psi system with a three systems A, B and Standby
system A and B will operate primary flt controls thrust reversers, brakes and landing gear
the landing gear is primarily through A, but has a landing gear transfer unit, that if system A fails system B will take over and operate landing gear.
There is a power transfer unit is operated by A pressurizes B fluid that will operate the leading edge devises.
Standby system will operate rudder only, thrust reversers and leading edge devices.
There is 6 pumps 3 mechanical and 3 electrical. the electrical are a,b, and standby. the mechanical will be the a, b and APU.
Tell me about the AC system?
we have 3 sources of hot air the main engines, the APU and the ground source.
we have 2 packs that convert hot air into room temp. the right pack will fedd the mix manifold for the cabin. the left pack will feed the flight deck and the cabin. we have a trim air system that regulates the temp prior to reaching the cabin. we have 2 recirculating fans to recirculate the air inside the front cargo compartment. if you have to hook up ground air, its already preconditioned to room temp, you need to hook it up to the mix manifold.
sources of air?
main engines which is the 5, 9 and the fan stage. the apu and the ground source
outflow valve?
How many?
What does it do?
what powers it?
we have 2 outflow valves, 2 positive pressure relief valves and 1 negative pressure relief valve. the pack works by taking hot air from the 3 main source, going through the primary heat exchanger, air cycle machine compressor , secondary heat exchanger, water separator, turbine of air cycle machine, water separator , mix manifold .
max cabin pressure 8.65 at 37,000 ft with cabin alt at 8,000
For take off and landing max pressure .125 psi for emergency purposes
What Does it do?
it regulates the pressure by basically pumping air into a sealed container to make the pressure higher which simulates a lower altitude. The outflow valve releases some of the pressure once it gets to the max pressure.
What powers it? eletrical power
its mechanically operated with a spring and ball bearing
How many negative pressure release valves(s)?
What does it do?
What powers it?
1 negative pressure relief valve
What does it do? In case both outflow valves gets stuck in the closed position and the plane begins to descend below 8,000ft, the outside pressure can be higher than the inside pressure.
its mechanically operated with a spring and ball bearing
Tell me about the electrical?
3 generators reducing 115 volts AC 3 Tranformer Rectifiers convert AC toDC 2 generator buses 2 main buses 2 dc buses 2 transfer buses 1 battery 28V dc 1 invertor dc to AC 1 hot battery bus 1 battery charger 2 main generators have constant speed drive meant to regulate the speed of the generator constant to produce 400 cycles per second. if the constant speed drive disconnects in the air, it cannot be reconnected until its back on the ground.
Can you get outside AC and DC power?
yes, from the receptacles
Anti icing systems
thermal and electrical
thermal 5th and 9th stage of the engine. ie: cowl lip and the leading edge slats from the engines out to the tip
the electrical would be the wind shield and and pitot tube
the gear system
6 wheels, 4 brakes and an anti-skid.
purpose of anti skid is to prevent the wheels from skidding therefore, reducing the stopping distance
fire protection
the main engines have 2 loops with 4 detectors a piece , the apu has one loop and so does the wheel wheel. a wheel well fire is put out by lowering the landing gear. the APU and the main engines have freon fire bottles to put the fire out. there is 2 for the main engines and 1 for the APU. they cannot be exchanged however, you can use both bottles for the main engine on either engine Types of fires: a- combustable materials b- liquids c- electrical
other areas with fire protection is the lavatory with smoke detector and a co2 extinguisher in the trash can. the cabin has both gas and water extinguishers
How many DC buses?
How man AC buses?
dc-2
ac-2
how come the APU doesn’t constant speed drive?
the apu is a non-throttable engine only produce one speed. The main engines are different because they go from idle to cruise back down to idle, so the constant speed drive needs to maintain those generators at the same speed
What is the APU? 3 things
provides back up electrical, backup pneumatics (AIR) for the air conditioning system and pneumatic air for the start up of the main engines
Who makes the APU?
garret corp
