Robinson 22 POH Section 7: Systems Flashcards
Describe the R22 (3 things)
1) Two place
2) Single main rotor
3) Single engine helicopter
Describe the tailcone
A monocoque riveted aluminum sheet design, with the skin carrying the primary loads.
What is the rotor made of?
It is all metal
The coning and teeter hinges use ______-_____________ bearings.
self-lubricating
What is the purpose of the droop stops?
Provide friction to the teeter hinge, preventing the rotor from teetering while starting and stopping
What happens if the bond line is exposed?
It may be damaged
The rotor housing is filled with _____ and sealed with an _______________ boot
oil, elastomeric
What is the spar made of?
Stainless steel
The tail rotor has two ___-_____ blades and a _________ hub with a fixed _______ angle.
all-metal, teetering hub, coning
What type of drive system does the R22 have?
vee-belt
Describe the transmission of power in the R22
Engine => Lower sheave => vee-belt power transfer => upper sheave => sprag clutch => power transfer through flex couplings main rotor (forward), tail rotor (rear)
How are the main rotor and tail rotor gear boxes lubricated?
Splash-lubricated
Describe the engine in the R22 (7 items)
1) Lycoming
2) Four cylinder
3) Horizontally opposed
4) Over-head-valve
5) Air cooled
6) Carbureted
7) Wet sump
What other components are associated with the engine? (7 items)
1) Starter
2) Alternator
3) Shielded ignition
4) Two magnetos
5) Muffler
6) Oil cooler
7) Induction air filter
Describe the cooling system on the R22? (2 items)
1) Direct drive
2) Squirrel-cage fan
Above 4,000 feet, what systems are less effective? How would you operate the helicopter in these conditions?
Correlator and governor. Power changes should be slow and smooth
At _____ power settings above ______ feet, the throttle is frequently wide open and the RPM must be controlled with _____________
High, 4000, collective
How does the governor maintain engine RPM
By sensing and applying corrective throttle inputs through a friction clutch with can be easily overridden by the pilot.
The governor is only active above ______ engine RPM
80%
In the R22 what helps balance control loads in the rotor
Trim springs
The engine throttle is also correlated to collective inputs through a ____________ ____________
mechanical linkage
In flight leaning is _____ ____________
not recommended
What does the clutch actuator do?
It raises the upper sheave when the pilot engages the clutch switch
What makes the clutch actuator stop?
It senses compressive load and switches off when the belts are properly tensioned
Blades should start turning how quickly after clutch engagement?
Within 5 seconds
Describe the fuel system and its components
It is gravity flow, and has a main tank and an auxiliary tank, shutoff valve, strainer.
8042B Does not have what in the fuel tanks
Bladders, 5 minute, 1 gallon, when the low fuel light comes on
Fuel samples should be taken from what three places?
Gascolator, main tank, aux tank
Low fuel light is actuated by a __________ ________ _______ located on the bottom of the main tank.
separate electric sender
The fuel shutoff valve controls flow from _______ tanks to the engine
both
Describe the flow of fuel through the fuel system.
Aux tank => Main tank => mixture control => carburetor => gascolator => primer => fuel nozzles
Describe the electrical system on the R22
14-volt, DC system which includes an alternator and a sealer lead-acid battery.
The battery switch controls what?
It controls a relay which disconnects the battery from the electrical system.
A wire protected by a fuse near the battery does what?
It by passes the battery relay allowing both tachometers and the clock to continue to receive battery power with the battery switch off.
Except in emergencies don’t operate the ____________ with the battery switched off
alternator
What does the ALT light indicate? What do you do if it comes on?
Indicates low voltage and possible alternator failure.
Turn off nonessential electrical equipment
Switch alternator off then back on to try and reset
If alternator light stays on, turn alternator off and land as soon as possible.
In any electrical system, what are the 5 main things that you have?
1) Source
2) Storage
3) Wires
4) Protection
5) Users
Describe the lights on the R22
- Red anti collision light on the tailcone (controlled by the strobe switch)
- Position lights, red (left), green (right), white tail (controlled by the nav lights switch
- Two landing lights (controlled by the landing lights switch)
Landing lights operate only when what is acuated?
The clutch is in the engage position.
How is the rotor tachometer signal provided?
Two magnetic senders at the main gearbox drive yoke.
Each tach is on a separate what? Why is this
circuit, for redundancy
When the battery and alternator switches are off, how do the tachs continue to receive power?
A bypass circuit connected directly to the battery.
How do the chip indicators work?
When metal particles are drawn to the magnets they close an electrical circuit, illuminating the caution light.
Where is the carbon monoxide sensor located?
Above the pilot’s heater outlet
In case of a fire, what should you do with cabin heat?
Turn the cabin heat off
If the tail is sitting within what distance from the ground, does the crosstube require replacement?
34 inches
If the CO light comes on, what should you do? (4 things)
Shutoff heater
Open nose and door vents
If hovering, transition to forward flight
If you start to get symptoms, land immediately
