Cessna 208 Study Guide/Checkride
What is P3 air used for? Main one? - ✔ ✔ • PT6A-114A, Reverse
flow, free turbine, 3 stage axial, 1 stage centrifugal compressor 7:1
compression ratio
• Flat rated to 675 SHP at 1865 ft-lb. and 1900 RPM
• 14 simplex fuel nozzles, 10 operate for initial start; 14 after 30-35%
Ng
• 101.6 Ng = 38,100 RPM
• Power turbine speed is 33,000
• Moving into BETA range while prop is feathered can damage prop-
reversing linkage
• Torque meter uses a ratio of engine oil pressure to reduction gear oil
pressure to operate
,• P2.5 bleed air exits axial stage through compressor bleed valve, can
be diverted to the cabin for supplemental heat or defog on ground only
• P3 bleed air is used for every other system on the plane
What OPSPEC allows us to fly IFR into Class G airspace? What are the
four things you need to do it? - ✔ ✔ OPSPEC- C080
1. The airport is served by an authorized instrument approach
procedure.
2. The airport has an approved source of weather.
3. The airport has a suitable means for the PIC to acquire ATC advisories
and the status of airport services and facilities.
4. The facilities and services necessary to safely conduct IFR operations
are available and operational at the time of the particular operation.
What OPSPEC lists the airports we can fly IFR to? - ✔ ✔ C-080-1
*Kasigluk isn't listed
What three things do you need to T/O and Land under IFR? - ✔ ✔ 1.
The aircraft is continuously in a position from which a descent to a ldg.
on the intended rwy can be made at a normal rate of descent.
2. Visibility isn't less than the prescribed vis. in the standard instrument
approach.
3. Visual references for the intended rwy are distinctly visible and
identifiable.
, i.e. Threshold, Threshold markings, threshold lights, rwy end identifier
lights, etc.
What are the main reasons we use a lead acid battery? - ✔ ✔ 1. For
starting
2. Stand by pwr
*3. Absorb voltage spikes
What Ng% are you looking for during start up? - ✔ ✔ Wait for 46%
after initial startup, then once the annunciator turns off wait for 52%
and turn off starter so the generator can take over.
What amp and type of stby alternator is used? - ✔ ✔ 75 amp-belt
driven stby alternator .
*If you forget to turn it off after shutdown you'll drain the batt.
What are the Stations, Locations, Temps, and PSIA for Py air? - ✔ ✔
Station Location Temp PSIA
2.5 Interstage Compressor 110c 26.4
*3 Compressor Discharge 280c 103
5 Inter Turbine 690c 35
7 Exhaust 551c 15.5
What % of the air intake is used within the turbine engine? - ✔ ✔
25% for air combustion
65% for cooling
5% for airframe servicing
What is P3 air used for? Main one? - ✔ ✔ • PT6A-114A, Reverse
flow, free turbine, 3 stage axial, 1 stage centrifugal compressor 7:1
compression ratio
• Flat rated to 675 SHP at 1865 ft-lb. and 1900 RPM
• 14 simplex fuel nozzles, 10 operate for initial start; 14 after 30-35%
Ng
• 101.6 Ng = 38,100 RPM
• Power turbine speed is 33,000
• Moving into BETA range while prop is feathered can damage prop-
reversing linkage
• Torque meter uses a ratio of engine oil pressure to reduction gear oil
pressure to operate
,• P2.5 bleed air exits axial stage through compressor bleed valve, can
be diverted to the cabin for supplemental heat or defog on ground only
• P3 bleed air is used for every other system on the plane
What OPSPEC allows us to fly IFR into Class G airspace? What are the
four things you need to do it? - ✔ ✔ OPSPEC- C080
1. The airport is served by an authorized instrument approach
procedure.
2. The airport has an approved source of weather.
3. The airport has a suitable means for the PIC to acquire ATC advisories
and the status of airport services and facilities.
4. The facilities and services necessary to safely conduct IFR operations
are available and operational at the time of the particular operation.
What OPSPEC lists the airports we can fly IFR to? - ✔ ✔ C-080-1
*Kasigluk isn't listed
What three things do you need to T/O and Land under IFR? - ✔ ✔ 1.
The aircraft is continuously in a position from which a descent to a ldg.
on the intended rwy can be made at a normal rate of descent.
2. Visibility isn't less than the prescribed vis. in the standard instrument
approach.
3. Visual references for the intended rwy are distinctly visible and
identifiable.
, i.e. Threshold, Threshold markings, threshold lights, rwy end identifier
lights, etc.
What are the main reasons we use a lead acid battery? - ✔ ✔ 1. For
starting
2. Stand by pwr
*3. Absorb voltage spikes
What Ng% are you looking for during start up? - ✔ ✔ Wait for 46%
after initial startup, then once the annunciator turns off wait for 52%
and turn off starter so the generator can take over.
What amp and type of stby alternator is used? - ✔ ✔ 75 amp-belt
driven stby alternator .
*If you forget to turn it off after shutdown you'll drain the batt.
What are the Stations, Locations, Temps, and PSIA for Py air? - ✔ ✔
Station Location Temp PSIA
2.5 Interstage Compressor 110c 26.4
*3 Compressor Discharge 280c 103
5 Inter Turbine 690c 35
7 Exhaust 551c 15.5
What % of the air intake is used within the turbine engine? - ✔ ✔
25% for air combustion
65% for cooling
5% for airframe servicing
