T-6 DASH ONE Flashcards
What is the T-6 Gross Weight?
4.900 pounds
What is the T6 maximum take off gross weight?
6.500 pounds
May solo flights be conducted from the back seat?
No – only from the front seat.
How much Horse Power is the T-6 engine rated to produce?
1.100 HP
What is the oil capacity of the oil system?
18,5 quarts
The oil level must be serviced within ____ minutes of engine shutdown?
30 minutes
What is the EDM? What does EDM abbreviate?
Engine Data Manager.
What does SCU abbreviate? And what does the SCU do?
Signal Conditioning Unit.
Contains the logic to illuminate the warning annunciators on the Central Warning System (CWS).
What is wrong if the amber OIL PX annunciator illuminates a single momentary time during maneuvering?
Nothing is wrong – it illuminates due to the sensitivity of the SCU (Signal Conditioning Unit).
What is wrong if the oil pressure indicator indicates normal oil pressure while both the amber and red OIL PX annunciators are lit?
Failure of the Signal Conditioning Unit (SCU)
How is engine power output measured?
By the torque produced by the Reduction Gearbox (RGB).
What does the RGB (Reduction Gearbox) do – and where is it mounted?
The RGB reduce power turbine output of 30.000 RPM to the propeller operating at 2.000 RPM. It is mounted on the front of the engine and driven by hot gasses from the power turbine. No mechanical connection ties the RGB to the turbine.
What does PMU abbreviate? And what does the PMU do?
Power management unit.
Automatically controls the propeller blade angle (Pitch) and propeller speed (Np)
To which altitude is 100% torque available on a standard day?
Up to app. 12.000’ – 16.000’
What is the constant speed of the propeller in RPM?
2.000 RPM
How is the propeller maintained at a constant speed?
The PMU (Power Management Unit) controls the propellor RPM by varying the propellor blade angle (Pitch) through the PIU (Propellor Interface Unit).
How is propeller speed maintained at 2.000 RPM when the PMU malfunctions?
The mechanical flyweight over speed governor modulates oil pressure to maintain Np at or below 100 plus/minus 2% RPM.
Which are the methods to feather the propeller?
With PMU in NORM shutting down the engine with the PCL will give a signal til the prop servo valve to drain the propeller oil pressure. If PMU is OFF – no signal is send.
Placing the PCL to cut-off also activates micro switches that power the feather dump solenoid valve which also dumps oil pressure from the propeller.
If PROP SYS C/B is pulled the solenoids will not be powered.
What is wrong if dashes are displayed for the RPM and torque values?
By cycling the PMU switch you can reset the system if the fault occurred due to a propeller rate limit exceedance. But if the fault is caused by a faulty sensor resetting the system does nothing.
So by recycling the PMU switch you can find out, what is wrong.
How many positions does the starter switch have?
How does the starter switch work?
AUTO/RESET, NORM and MANUAL.
Spring-loaded to NORM.
Lift over detent to MANUAL.
Selecting MANUAL will engage the starter until moved out of MANUAL.
Momentarily placing the switch in AUTO will engage the starter and energize the ignition system.
What to do if the IGN SEL annunciator remains continuously illuminated?
Inform maintenance after the mission.
Which buttons and switches are located on the PCL’s (Power Control Lever)?
Rudder trim
Speed Brake
UHF/VHF comms
ICS (Intercommunications system)
If during ground operations the PCL is inadvertently moved to cutoff – do not attempt to move the PCL back to idle in an attempt to relight the engine?
TRUE / FALSE ??
TRUE
If done – severe damage to the engine could occur.
What does the EDM (Engine Data Manager) monitor?
Engine parameters – and illuminates annunciators as necessary. Also monitors: Fuel balancing Fuel quantity indications, DC volts and AMPs, HYD pressure, Cockpit pressure altitude, Cockpit differential pressure.
What is Np and Ni respectively?
Np is propeller speed.
Ni is gas generator speed.
How many Electronic Instrument Displays are there in each cockpit?
Which?
3:
Primary Engine Data Display
Alternate Engine Data Display
Engine/System display
What is wrong when “EDM FAIL” is displayed in the lower portion of the affected Electronic Instrument Display (EID)?
The EID is not receiving all the required data In the proper format.
Only those data replaced by dashes are invalid – the rest are functioning normal.
How is the PMU (Power Management Unit) normally powered?
If primary power source is lost?
By the Permanent Magnet Alternator (PMA).
The battery bus is the secondary backup power source.
When does the PMU (Power Management Unit) switch from primary power source (PMA) to the secondary power source (Battery)?
When the PMA (Permanent Magnet Alternator) fails.
or
When the propeller RPM (Np) drops below 40-50%.
What are the two operating modes of the PMU (Power Management Unit)?
Describe them?
Ground and Air mode.
Weight on wheels switches on the main gear strut controls the modes.
What is idle power on the ground and in the air?
60-61% Ni on the ground.
Minimum 67% Ni in the air.
Above 10.000’ the PMU raises the Ni to maintain the Np above 80%.
What is wrong if the idle Ni is 67% on the ground (Normal is 60-61% Ni)?
The LDG GR CONT c/b may be tripped
or
Weight on wheel issue
The PMU provides an autostart capability with a built in automatic shutdown feature in case of hot/hung starts.
Are the autostart and shutdown features available on ground and in the air?
Autostart is available on ground and in the air. The shutdown feature is available on the ground only.
During an autostart, when will the PMU perform the auto shutdown process?
If a hung, hot or no start is projected.
Will the PMU (Power Management Unit) always use the IOAT for engine starts?
No.
A IOAT at or below 96º C will be used by the PMU.
If IOAT is greater than 96º C but less than 121º - 121º C will be used.
If temperature is greater than 121 C the PMU will go offline and will not reset before IOAT is below 121 C
Describe the autostart sequence.
Move PCL to autostart position.
ST READY annunciator illuminates
Wait 3 seconds or more
Place starter switch to AUTO/RESET momentarily.
Move PCL to IDLE when Ni is at or above 60% RPM.
What should be done if the green ST READY annunciator extinguishes during a normal start sequence?
Move the PCL to OFF if it has been placed in IDLE.
Reselecting the starter switch to AUTO/RESET.
Perform the ABORT START PROCEDURE.
What is the ABORT START PROCEDURE
A procedure to burn residual fuel and/or to lower ITT.
What does the FIREWALL SHUTOFF HANDLE do?
When pulled it closes valves at the firewall cutting off fuel and hydraulic fluids as well as bleed air to the engine.
The fuel auto balance system keeps the fuel level in the fuel wing tanks within _____ pounds of each other?
20 pounds.
The system closes the light wing’s transfer valve if an imbalance of 20 pounds or more is detected for more than 30 seconds.
What happens if the fuel imbalance is not automatically reduced to less than ____ pounds within ___ minutes?
What should then be done?
30 pounds
2 minutes
The FUEL BAL annunciator turns on and auto balance system shuts off.
Reset the fuel balance system – may be done multiple times. Place the FUEL BAL switch to MAN/RESET momentarily – then back to AUTO.
When does the L FUEL LO or R FUEL L annunciators illuminate?
What are the colors of the annunciators?
Amber.
Illuminates with fuel less than app. 110 pounds..
How much fuel in each wing?
In Collector tank?
527 pounds in each wing.
47 in Collector tank.
When should you not attempt to manually balance the fuel?
If alternate engine data display is indicating FP FAIL.
When does the M FUEL BAL annunciator illuminate?.
When the fuel balance switch is in the MAN/RESET position.
How many fuel probes is used in the fuel quantity indicating system?
Where are the probes located?
7 probes.
3 in each wing – 1 in the collector tank.
Does automatic fuel balancing and the fuel low warning lights work with FP FAIL indicated?
The low fuel warning lights will work – but the automatic fuel balancing will not work.
During inverted flight a minimum of ____ seconds of fuel supply will be provided.
60 seconds
What to do if the FUEL PX annunciator illuminates and the fuel boost pump activates during inverted fligt?
Cease inverted flight – and notify maintenance after the flight.
Which power sources does the electrical system consist of?
28 VDC, 300 AMP starter/generator,
Aerobatic 24 VDC battery
24 VDC AUX BAT
External power receptable.
The generator needs to supply a minimum of ____ volts to charge the battery?
25 volts
How may the generator be reset?
Cycle the generator switch to off and back on.
Or
Use the generator reset button.
If the RED GEN annunciator illuminates the _______ is the only equipment automatically shed.
Air Condition
The battery is used for engine start and is capable of powering all electrical systems, except the _____.
Air Condition.
In an emergency situation the AUX BAT powers ____, _____, _____, _____ and _____ for app. _____ minutes.
The standby instruments The standby instruments’ lighting The UHF transceiver The backup UHF control Fire warning system
30 minutes
When should external power not be connected to the aircraft?
When the battery voltage is below 22,0 volts. Connecting could cause damage to the battery.
If the BUS TIE switch is set to OPEN, then the BUS TIE annunciator illuminates, and the battery and generator busses are separated.
If the battery/battery bus fails with the BUS TIE OPEN, then the _____ is not powered.
If the generator fails with the BUS TIE OPEN, then the ______ is not powered.
Equipment on the battery bus is not powered
Equipment on the generator bus is not powered..
What to do if brake pressure appears to fade during application?
Fully relieve pressure from the brakes in both cockpits – then reapply pressure.
The hydraulic system has a ____ quart capacity.
5
At _____ PSI is the pressure relief valve in the hydraulic system activated?
3.250 – 3.500 PSI
The normal hydraulic system pressurization is_____ PSI?
3.000 plus/minus 120 PSI
How much pressure is needed in the hydraulic system in order to operate the landing gear, main gear doors, flaps, speed brake and nose wheel steering?
1.800 PSI