Dash 1 - GK (Section I) Flashcards
The aircraft basic empty weight is approximately
4900 pounds
Maximum takeoff gross weight is
6500 pounds
The PT6A-68 is a ___-turbine turboprop engine (Figure 1-8) flat rated to produce ___ shaft horsepower. The engine is a ____-flow design with two independent sections:
free-turbine
1100 SHP
reverse-flow
the gas generator section and the power turbine section
The oil system has a capacity of ___ U.S. quarts
18.5 quarts
The oil system provides a constant supply of filtered oil to: (4 things)
engine bearings, reduction gears, accessory drives, and propellor
Oil level must be serviced within __ minutes of engine shutdown. For most accurate results, check oil level __ to __ minutes after shutdown.
30 minutes
15 to 20 minutes
The engine oil pressure indicator may display oil pressures up to __ psi with the engine shut down due to the design of the oil pressure transmitter.
4 psi
The oil is filtered by the main oil filter and then by several oil strainers. If the main oil filter becomes clogged…
a filter bypass valve allows unfiltered oil to continue to lubricate the engine.
The SCU (signal conditioning unit) will activate the red OIL PX annunciator if oil pressure drops to ____ when above idle power, or when oil pressure drops to ____ at idle power.
Above idle: 40 psi or below
Idle: 15 psi or below
The SCU will illuminate the amber OIL PX annunciator whenever sensed oil pressure is between ____ at idle power, and if the oil pressure drops to between _____, for ___ seconds, above idle power.
Idle: 15 and 40 psi
Above Idle: 40 and 90 for 10 seconds
If oil pressure remains between ___ and ___ psi at idle power for __ seconds or more, both amber and red OIL PX annunciators will illuminate
15 and 40 psi
5 seconds or more
Does a momentary illumination of the amber OIL PX annunciator while maneuvering indicate a malfunction?
Due to the sensitivity of the signal conditioning unit, a single, momentary illumination of the amber OIL PX annunciator while maneuvering is possible but may not indicate a malfunction.
Will normal oil pressure buildup during engine start illuminate the amber OIL PX annunciator?
No. The SCU contains logic to prevent nuisance amber annunciator illumination from normal oil pressure buildup during engine ground start.
The Reduction Gear Box is a two-stage planetary reduction drive to reduce the power turbine output shaft speed of over ____ RPM to the propeller operating speed of ____ RPM.
30,000 RPM to 2,000 RPM
Power Turbine -> Propeller
A chip detector is mounted in the ____ to detect ferrous material in the oil
Reduction Gearbox
The ____ drives the aluminum __-inch, ____- bladed, constant-speed, variable-pitch, non-reversing, feathering propeller through the _____
power turbine
97-inch
four-bladed
reduction gearbox
What automatically controls the propeller blade angle (pitch) and propeller speed (Np)?
the PMU (power management unit) and the PIU (propeller interface unit)
Because the engine is flat rated, 100% torque is available from sea level to approximately ___ to ___ MSL on a standard day
12,000 to 16,000 feet MSL
At 100% indicated torque, the engine is producing approximately ___ foot-pounds of torque at the prop shaft. This equates to approximately ___ pounds of thrust at sea level, zero airspeed.
2900 foot-pounds
2750 pounds of thrust
Propeller pitch may be defined by three basic conditions:
Feathered, Low Pitch, and High Pitch
When feathered, the propeller blades are aligned _____. About __° from the reference plane
Nearly straight into the wind (~ 86°)
When in low pitch, the propeller blade angle is approximately __° from the reference plane
15°
When will the propeller blades be at low pitch?
Low speeds and low throttle settings
With the PMU function- ing, the mechanical overspeed governor modulates oil pressure to the propeller pitch change piston to limit NP below ___%, while the electronic governor will maintain NP at ___%.
106%
100%
f PMU function is lost or deactivated, the mechanical fly- weight overspeed governor modulates oil pressure to the propeller pitch change piston to maintain NP at or below ____%
100±2%
The primary engine data display presents:
torque, propeller RPM (NP), indicated outside air temperature (IOAT), gas generator speed (N1), and ITT
The PCLs are interconnected with a ____ so movement of one PCL moves the other. A flexible cable connects the front PCL (electrically and mechanically) to the?
push-pull rod
Fuel Management Unit (FMU)
The alternate engine data display presents: Except for torque, none of the above signals are processed by the PMU
alternate torque, alternate N1, cockpit pressure altitude, cockpit differential pressure (delta P), fuel flow, fuel quantity in the respective wing, and raw ITT (RITT)
What powers the PMU?
the PMA (permanent magnet alternator) which is mounted on the reduction gearbox
The Permanent Magnet Alternator supplies ___ VAC, which the PMU converts to DC.
32 VAC
