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Pilot's Handling Notes for the Fiat G.12L with Fiat A.74 RC42
engines
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The three 770hp Fiat A.74 RC42 engines drive constant speed
airscrews. They have automated mixture controls and manually
applied carb heat controls. Superchargers sustain that rated
power up to 4200 metres. Each engine can deliver 820hp for up to
two minutes for TOGA at sea level. Fiat engines cause swing to
the left. The virtual flight engineer will operate the oil cooler
shutters and select the appropriate supercharger gear ratio
throughout the flight according to the engine RPM demanded,
current altitude and the weather. The engine cowl flaps are under
pilot control in this simulation.
AUTOMIXTURE - This engine has automixture in real life and in
MSFS.
The manifold pressure gauges of this aircraft are calibrated in
Kg/Cm^2 abbreviated C.
CARB HEAT - When C < 0.8 and OAT < +5C apply CARB HEAT for
30 seconds every few minutes to clear carb ice. Use of CARB HEAT
CAUSES significant LOSS OF POWER.
Maximum fuel load is 7,116lbs of 87 Octane AVGAS. This is loaded
by default in FS9 but limits payload to 12 passengers plus bags.
Post war initial design cruise altitude was 3000 metres.
Operational ceiling is always higher.
The landing gear is approved for use from unpaved (but not
unprepared) surfaces.
Read 'How to fly the Fiat G.12' before flight.
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Take Off:
AUTOPILOT = OFF
FLAP = STAGE 1 (one light)
CARB HEAT = COLD
COWLS = 40%
ELEVATOR TRIM = 1 cabrata
RUDDER TRIM = destra
RPM = MAX
LINE UP
TAILWHEEL LOCK = ON
BRAKES = ON
RPM = MAX
THROTTLES = FULL
BRAKES = OFF
YOKE = FULL FORWARD to raise tail
TAIL UP - wait 2 seconds - ROTATE FIRMLY
POSITIVE RATE OF CLIMB
GEAR = UP
ACCELERATE = 170 KmIAS
FLAP = UP
ACCELERATE = 210 KmIAS
Call for Climb power
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METO power:
C = 1.0
RPM = 2400
190 KmIAS
COWLS = 40%
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Climb phase power:
*DO NOT EXCEED 3.5 m/s*
210 KmIAS
RESTRAIN C to achieve target + limit above
RPM = 2300
COWLS = 20%
On reaching 3000 metres
Call for econ cruise power
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Econ (normal) Cruise: G.12L
C = 0.8
RPM = 1850
COWLS = CLOSED
Plan 680 PPH
Note: Yields 159 KTAS at 3000M (FL98)
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Max Cruise:
Use to battle headwinds
C = 0.9
RPM = 2000
COWLS = 10%
Plan 920 PPH
Note: Yields 185 KTAS at 3000M (FL98)
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Descent:
*DO NOT EXCEED -3.5 m/s*
Retain CRUISE RPM
DO NOT EXCEED 350 KmIAS
*AVOID SHOCK COOLING*
C reduce @ 0.1 per minute
C => 0.5 (*MIN*)
COWLS = CLOSED
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Holding:
FLAP = UP
RPM = 1850
C = as required to sustain
210 KmIAS
COWLS = as required
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Approach Circuit and Landing:
C => 0.5 until over boundary fence
*Before Glidepath or Circuit*:
C = 0.5
REDUCE = 170 KmIAS
COWLS = 20%
GEAR = DOWN
FLAP = STAGE 1 & 2 (two lights)
C as required to sustain
170 KmIAS
Downwind:
RPM = 2300
170 KmIAS
Base Leg:
C => 0.5 as required to
Turn final @ 155 KmIAS
Final:
CARB HEAT = COLD
In time to achieve Vref
FLAP = STAGE 3 (four lights)
Cross airfield boundary @ 140 KmIAS (all weights)
C < 0.5 allowed
FLARE
After mainwheel contact
CORRECT any drift
PULL TAILWHEEL GENTLY INTO CONTACT
YOKE FULL AFT
COWLS = FULL OPEN
FLAP = UP
BRAKES = as required
TAILWHEEL = UNLOCK before taxi
RPM = MAX before taxi
Nose engine = SHUT DOWN
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