Test 4 Flashcards
What is purpose of the Torlon bearings?
to guide the tail rotor blades
What else is located on the TR hub?
interupter to the mag pick up, 6 balance screws
What are the tail rotor blades made from?
carbon fibre with and outer layer of glass fiber and hard foam core
What is used to measure an unbalance on the TR?
mag pickup and an installed accelermeter
When can a TR balance be c/o?
at 100% flat pitch on ground
What are the pre-requisits for a TR balance to be c/o?
control pedals parallel, collective lever at FLI 2.5-3 and the AFCS/SAS switched OFF
Which direction are the 6 fixation points for the TR balance washers?
Counter clockwise starting at the interrupter marker
How many types of balance washers are available?
3 different plus one special aluminum one.
How is the position of the TR centre plat determined?
by a setting shim
What is located between the pitch change spider and the control cuff ball segment?
a ceramic bushing
Where is the TR chip detector located?
at the lowest part of the gearbox
How can the pilot acknowledge the TGB CHIP caution?
the reset button on the cyclic stick or the ACK button on the FND
What is the purpose of the 60 degree offset on the TRDS flex packs?
to prevent any deficiences in strength
What is located on the TRDS flex disc packs to index?
indexing round edges
What is the purpose of the rubber sleeves on the TRDS bearings?
dampen vibrations, compensate potential misalignment and incase of emergency with a seized bearing.
What is the function of the TGB bearing outer race?
it is also used as the fixation point towards the TGB housing via the cover
What are the FWD and AFT drives shafts made from?
carbon fibre with a layer of glass fibre
What is the long TRDS made from?
Steel
Where is the sigh glass located for the TRGB?
on the LH side below the servo control suppoer assembly
Where is the hydraulic unit located?
on the Upper Deck
How many control rods are attached to the mixing lever?
3
What is the purpose of the mixing lever?
to transfer signal to the swashplate from the control rods
What is the parallel actuator DC motor attached to?
the primary reducer before the electro mag clutch
If the trim actuator switch is moved to the left and the cyclic is moved to the right, what would happen?
the shear pin would break
How could a jammed parallel actuator be freed?
be applying a momentory high force to the cyclic stick
If the spool valve is in the neautral position, which side is the px on the boost piston?
neither, its in neutral
How mnay bearings does the gimbal contain?
4
what connects the gimbal to the control ring?
2 bearings
a RED WARNING light indicated what?
a possibility of physical harm
Who can carry out 1st and 2nd line maintenance?
operator, service centre or MRO,
Who can carry our 3rd line maintenance?
Operator or MRO?
Engine TBO’s include what?
engines, modules and accessories
What is included in the engine life limit parts?
compressors and turbines
What is the purpose of the engine air inlet?
to direct ambient air into the engine
What sensor is located in the engine air inlet?
T1 sensor
How many stages are the engine reduction g.box?
2
What directions do the compressor and turbines spin?
compressors and N1 ACW, N2 CW
How is the Arriel 2E controlled?
fully by the EECU
What type of combustion chamber is in the Arriell 2E?
annular with a centrifugal injection wheel
What are the compressors made from?
titanium
what is the exhaust made from?
stainless steel
What module is the axial compressor?
M02
What module is he centrifugal compressor stage?
M03
WHat stage is the gas generator stage?
M03
How many modules are there on the engine assembly?
5
the bleed valce is found on which module?
M02
Where is the engine identifiaction plate found?
on the module 1 transmission shaft and accesort g.box
What is the purpose of the secondary air?
to dilute and cool gases
What is the speed of the N1 shaft?
52110 rpm
What is the speed of the N2 shaft?
6000rpm
How many stage diffuser is in the centrifugal compressor?
2 stage
What is the temperture of the Gas genertor turbine?
1125 C
What is the temperture of the combustion chamber?
2500 C
Where is the start-electro and stop-electro valve unit located?
on top the of centrifugal compressor section of the engine
How many pumps are on each engine?
2
What is the purpose of the fuel Px transmitter before the fuel filter?
to detect a px difference if the filter is blocked
What is the purpos of the Px relief valve next to the HP fuel pump?
to return fuel back to the pump imlet incase of an overPX
At what speed will the start electro valve be de-energised?
61% N1
above 61% N1 what is flowing through the starter injectors?
P3 air
At the beginning of engine starting how is the fuel system purged?
LP pump pushes fuel through the piston valve and opens the ball valve pushing any air (with a small amount of fuel) into the expansion tank.
What Px does the pressurinsing valve open to allow fuel to reach the centrifugal injector wheel?
52.2 PSI
a fuel PRE-BLOCKAGE Lv.1 will give what notification?
an advisory on the ground at engine shut down
a fuel PRE-BLOCKAGE Lv.2 will give what notification?
an amber CAUTION in flight
Where is EECU 1 installed?
under the main trans deck
Where is EECU 2 installed?
on the R/H side shell
Which ways can a engine be shut off?
engine main switch to OFF, or automatically by closing the electro stop vlave if an N2 120% overspped is detected
Where are the ignitor plugs located?
next to the start injectors at 2 and 10 o’clock
What control of the stop electro valve does the EECU have?
full control
Where is the stop-electro valve located?
on top of the centrigugal compressor casing
where is the ignitor unit located?
on the rh side of the engine centrifugal compressor casing
What material is the T1 temperture probe made from?
Platinum
What is the purpose of the bleed valve?
to bleed 2.4 air and allow a great flow of air through the axial compressor to prevent a compressor surge
Where is the start injector air purge from?
P3
air tappings are taken from which Px section?
P3
The internal air system is used for sealing what?
Pressurising labyrinth seals
Where is P2.4 air bled from?
the centrifugal compressor inlet
Where is P2.6 air bled from?
the centrifugal compressor wheel outlet
Where is P3 air bled from?
the centrifugal compressor outlet after the diffuser
What voltage is supplied to the P3 Px transmitter?
10VDC
The fuel pump and metering unit are part of which parent?
the engine
Which engine parameters are indicated in the cockpit?
N1, N2, TRQ, and T4.5
The priniciple of limitations of the engine are based on what?
N1, TRQ and T4.5
How are the engine parametres sent to the MFD from the EECU?
by a serial data link
How many N1 sesnors are there?
2
Where is the 2nd N1 sensor located?
it’s taken from the engine alternator
How many N2 sensors are there?
3
How is the TRQ measured?
though a transmission shaft, referance shaft, phnic wheel and TQ sensor
Where is the TQ data sent to?
the EDR (engine data recorder)
Where is the FLI located?
on the FND page next to the IAS
What is the FLI?
current engine limits
How is the FLI shown on the FND?
as a vertical bar graph representing collective lever range 0-10
How is the EDR linked to the EECU and ground station?
by a CAN link
What effect does a Lv.1 EECU failure have on the engine controls?
None
What effect does a Lv.2 EECU failure have on the engine controls?
degradation, N1/N2 still given but engine performance is limited
What effect does a Lv.3 EECU failure have on the engine controls?
FADEC FAIL caution. Ultimate Back-up mode used
What is ultimate back up mode?
uses NR instead of N2, and T4.5 instead of N1
What caution will ultimate back-up mode enable?
FADEC DEGRADED
If FADEC FAIL remains on during ultimate back up mode, what must be done?
engine shut down
What is the purpose of the exhaust?
continues the expansion phase of the gas cycle and expels them overboard
Where is the exhaust attached to?
the rear of the Power Turbine around the reduction G.BOX
What is the exhaust made from?
stainless steel
What is the purpose of the heat shield?
protects the battery and gearbox
What temperture are the exhaust gases?
605C
What is the purpose of the engine oil system?
cools, lubricates, removes wear particles, dampens vibrations and protects against corrosion
Where is the engine oil check valve located?
after the scavange pumps
What is the purpose of the check valve?
to prevent oil from flowing backwards in case of low oil Px
What is the normal operating Px of the engine oil?
2.25 - 12 bar
What are the engine oil pipes made from?
flexible steel braided lines or rigid stainless steel
How many pumps are on the oil system?
4
How many scavange pumps are there?
3
What type of pumps are they?
georotor type pumps
How are the eng oil pumops driven?
by the ACC GBOX N1 drive shaft
How many strainers are installed?
3
Where is oil filter clogging caution advisory shown?
on the FND master list
if the advisory ENG OIL FILTER is displayed, what does this mean?
it is pre-clogging information and requires immidiate maintenance
What is the idle speed of the engine?
78%
What speed does the Starter gene turn into gen mode?
61%
What are the functions of the startering system?
starting, venting, ignition and overheat monitoring
What information would a starter overheat give?
amber caution GEN OVERHEAT
What detects the starter gen overheat?
a thermoswitch
Where are the N2 pickups located?
on the engine reduction gearbox (M05)
What is the purpose of the collective friction brake?
to prevent undesired movements of the collective during flight
What is the purpose of the Px sesnors on the IBF?
to detect a blockage
How is IBG clogging indicated?
by a bar graph on the VMD
What type of gears are the ENG REDUCTION GBOX?
helical gears
What is the purpose of the LVDTs?
to inform the EECU of the position and movement of the collective lever
What type of oil system is the engine?
a dry sump
What is the engine oil temperture range?
0-115C
What indiation is given at engine start?
STARTER ON
What is th purpose of the T1 sensor?
used by the EECU to compute fuel control and engine limits.
