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Flying PNG > DHC-6 Twin Otter > Flashcards

DHC-6 Twin Otter Flashcards

1
Q

How many emergency exits?

A

6 -
2 pilot doors
2 removable exit doors in row 2
2 rear doors

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2
Q

Maximum landing weight?

A

5579kg / 12,300lbs

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3
Q

Starting temp limits?

A

1090° for 2 seconds, then below 980° (925° SOPs)

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4
Q

Takeoff Power/T5/Np/Ng Limits? (300)

A

Torque = 50psi (reduce 1psi for every 1000’ above SL)
T5 = 725°
Np = 96%
Ng = 101.5%

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5
Q

Climb Power/T5/Np/Ng Limits? (300)

A

Torque = 45psi (reduce by 1psi for every 1000’ past 5000’ amsl)
T5 = 695°
Np = 96% (use 85% for noise)
Ng = 101.5%

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6
Q

Cruise Power/T5/Np/Ng Limits?

A

Torque = 40psi (reduce 1psi for every 1000’ past 10,000’)
T5 = 675°
Np = 96% (use 75%)
Ng =??

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7
Q

Minimum battery voltage for start?

A

24V (some docs state 23V)

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8
Q

Flaps are actuated how?

A

Hydraulically by a lever on the cockpit roof

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9
Q

What percentage of air is used for combustion/cooling?

A

25% combustion, 75% cooling/bleed etc

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10
Q

Fuel crossfeeding?

A

No crossfeeding between tanks is available, but one tank can feed both engines

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11
Q

Max takeoff weight?

A

5670kg / 12,500lbs

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12
Q

Front, rear and cabin loading weights/limits?

A

For long nose Hevilift aircraft:

Front locker = 136kg & 45kg/sqft loading
Rear locker = 226kg & 45kg/sqft loading
Rear shelf = 68kg (takes away from the 226kg limit)
Cabin = 91kg/sqft loading

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13
Q

How many turbines? What do they do?

A

2 - power and compressor turbine
*Power turbine runs the reduction gearbox and propeller
*Compressor turbine runs the compressor assembly, accessory gearbox and engine driven fuel pump

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14
Q

How many compressors? What type?

A

4 total, 1 centrifugal compressor and 3 axial compressors with stators in between

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15
Q

What systems does the hydraulic system supply?

A

Wing flaps
Nose wheel steering
Brakes

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16
Q

Hydraulic accumulators function?

A

Stores a small reserve of pressure and absorbers shock in the system from the hydraulic pump.

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17
Q

Hydraulic system location?

A

Underneath cockpit floor, rearward of nose wheel, accessed by panels on exterior of aircraft.

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18
Q

Flap/elevator interconnect tab?

A

Right elevator inner trailing edge tab:
Reduces trim needed when extending flaps beyond 8°

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19
Q

Beta reverse valve?

A

When the CSU is unable to maintain selected prop speed, BRV will restrict oil supply through approx +21° to stop the blade angle going below +17° in flight and +11° at idle in the power lever forward range.

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20
Q

Emergency Equipment Locations:
Oxygen
Fire extinguishers
Torch
First aid kits
Crash axe
Survival kit
Life jackets

A

*Oxygen - cockpit RHS
*Fire extinguishers - cockpit RHS & rear cabin
*Torch - cockpit
*First aid kits - cockpit & rear cabin
*Crash axe - cockpit RHS
*Survival kit - rear cabin
*Life jackets - under each seat

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21
Q

Hydraulic system is powered by what?

A

Left DC bus

22
Q

Minimum oil pressure acceptable to complete a fight is?

23
Q

Battery location and voltage?

A

Under the rear baggage compartment floor, 24V for 28V system.

24
Q

Is the hydraulic reservoir pressurised? What does it do?

A

Non pressurised, supplies fluid to the electric and hand pumps

25
You shouldn't move the power levers into reverse without the engines running because?
It can damage linkages
26
With engines off, battery voltage can be checked by..
Looking at the DC voltmeter
27
Describe the fuel tanks
Two fuselage tanks, one forward, one aft, both rubber and comprised of 4 cells each, 1 cell per tank is a collector tank which is fed by an ejector pump, the collectors feed the engines via boost pumps
28
Describe the components of each fuel cell
Forward tank cells (all have fuel sensor) 1) filler, no flapper, ejector outlet 2) drilled flapper 3) drilled flapper 4) collector, flapper, 2 x boost pumps, fuel low level float switch, fed by ejector pump from other cells Aft tank cells (all have fuel sensor) 5) collector, flapper, 2 x boost pumps, fuel low level float switch, fed by ejector pump from other cells 6) drilled flapper 7) filler, no flapper 8) drilled flapper, ejector outlet
29
Which tank feeds which engine?
Forward tank = right engine Aft tank = left engine
30
Fuel capacity?
1167kg / 2574lb TOTAL 1156kg / 2548lb USABLE *Forward tank = 691L usable * Aft tank = 755L usable
31
Fuel burn and endurance?
270kg/hr aprrox or 600lb/hr 4.25 hours endurance approx
32
What indicates that a fire bottle has been discharged?
One of the two coloured disks will have popped from the side of the engine nacelle, yellow for pilot activation red for thermal activation
33
Main power supply in flight?
Two starter-generators
34
How many inverters and how many used at a time?
Two inverters, one used at a time (the other remains in standby). If S.O.O is incorporated or on 310 then both work simultaneously, powering a bus each
35
Pitot static sources, where are the and what do they feed?
1 pitot and 2 static either side of fuselage, just forward of cockpit doors. Left instruments is left pitot and lower static Right instruments is right pitot and upper static
36
Stall detector locations/details?
*Two on leading edge of left wing *Powered by DC bus *Lower vane operates always *Upper vane operates when flaps more than 12° *Sound 4-9kt above stall
37
An illuminated FIRE Pull t-handle indicates?
One of the sensors is hot (check this one)
38
If the power (AC) to the fuel gauges is lost, what will they indicate?
The level of fuel at the time the power is lost (AC Lies, DC Dies)
39
Fire detection system is powered by which bus?
Left DC
40
Describe the two hydraulic leak scenarios
Leak upstream of brake system - will lose flaps and nose wheel steering Leak within brake system - will lose everything
41
Oil dipstick limit?
2.5qt below maximum/full
42
What happens if boost pump 1 fails?
System will automatically change to boost pump 2, light for 2 will briefly come on then go out
43
Beta backup valve?
Prevents the prop from going below +9° whenever the power levers are forward of idle. Electrically activated via a feedback ring and microswitch, will cut off the oil supply so that the counterweights coursen the blade angle. Will cycle on and off between +9° and +11°. Will deactivate for reverse by a microswitch in power level assembly.
44
How does the pitot/static system work when the emergency selector is set to EMER?
Both sides of instrument panel will use Co-pilots static source
45
Fire warning is provided by?
Illumination of a FIRE PULL handle and sounding of the fire bell
46
Vy Vx Vyse (IAS)
Vy = 100kt, flap 0° Vx = 87kt, flap 0° Vyse = 80kt, flap 10°
47
Vmo?
166kt to 6,700' Then 3kt reduction per 1000'
48
Vmca Vmcg With autofeather and without
Vmca = 64kt (68kt without autofeather), flap 10° Vmcg = 50kt, flap 10°
49
How does autofeather affect takeoff speeds?
If autofeather is inop, add 4kt to Vr, V1, V2 and Vmca
50
Vfe Speeds?
Vfe 10° = 103kt Vfe 10°-37.5° = 93kt
51
Take off calls and responses
"Autofeather armed" "Power set" "40kt" - "checked" V1 Rotate 400ft & above 91kt/clear of terrain - "terrain clearance" - "flap zero" "flaps zero" (once retracted) "set climb power" - "climb power set"
52
Va/Vb
132kt

Flying PNG (3 decks)

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