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Handling Notes for the Postwar CRDA Z.506 with

hydraulic Constant Speed airscrews.

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The post war Aironi, none delivered after 1942, retained

their AR126 engines all the way to retirement in 1959,

but they were all modified to have feathering Savoia

hydraulic constant speed airscrews which required new

controls in the old cockpit, allowing more flexible engine

operating procedures.

High power then became available for TOGA for the first time

and time to unstick was greatly reduced allowing take off

from smaller harbours during air ambulance sorties.

The omnipresent problem of engine overspeed disappeared,

but the early series Bristol Pegasus engines remained too

primitive to have cowl flaps to control engine cooling.

Usable fuel with no payload continued to be 3000Kg.

*********************************************************

Take Off Phase and power:

FLAP = UP

CARB HEAT = COLD

TRIM = 14 degrees UP

GIRI LEVERS = full aft (maximum)

LINE = UP

P2 = RETURN TO SEAT (])

THROTTLE = FULL

RUDDER = PREVENT YAW

YOKE = FULL AFT UNITL UNSTICK

AFTER UNSTICK = NO HUMAN BACK PRESSURE

ABOVE ALL OBSTACLES

ALWAYS < TWO MINUTES AFTER THROTTLE UP

BEGIN (MAX CRUISE) CLIMB PHASE

************************************

Max Cruise Climb phase:

TRIM = +14 (retained)

PRESSIONE = 0.9C

GIRI = 1750

REJECT when full throttle = 0.9C

************************************

Design = max cruise:

PRESSIONE = 0.9 C

GIRI = 1750

TRIM = to deliver VSI = 0

PLAN = 285 Kg/hr

YIELD = 169 KTAS @ 5000M @ 11000Kg

************************************

Patrol / Search / Holding:

TRIM = +14

GIRI = 1350

PRESSIONE = to deliver VSI = 0

PLAN = 135 Kg/hr

YIELD = 101 KTAS @ 300M @ 11000Kg

************************************

METO Climb phase:

TRIM = +14 (retained)

PRESSIONE = 1.0C

GIRI = 2300

REJECT when full throttle = 1.0C

************************************

Dash in METO power:

PRESSIONE = 1.0 C

GIRI = 2300

TRIM = to deliver VSI = 0

PLAN = 440 Kg/hr

YIELD = 199 KTAS @ 4250M @ 11000Kg

************************************

Descent = Arrival phase:

TRIM = DO NOT VARY

GIRI = 1350

VSI = MINUS 2 - 2.5 m/s

IAS ~ prior cruise IAS

PRESSIONE = to comply (trickle)

ToD = plan accordingly

IF PRESSIONE <0.6C & OAT <7 Celsius

THEN CARB HEAT = HOT

BEFORE IAF:

REDUCE <= 210 KmIAS (Vfe)

VSI = to comply

************************************

Approach and Landing:

On reaching 500M QNH VFR:

Before descending to MDA:

Often immediately after IAF:

FLAP = DOWN

GIRI LEVERS = MAXIMUM (full aft)

IAS = TRIM for 170 KmIAS

THROTTLE = to control VSI

After lined up on water runway:

CARB HEAT = COLD

BELOW = GLIDESLOPE

TRIM = FULL UP

CAUSES ~ 150 KmIAS (Vref)

THROTTLE = to control VSI

GLIDESLOPE = *only* with throttle

HUD PARALLAX = COMPLIANT

Around 5 Metres:

THROTTLE = CLOSED

YOKE = FLARE

************************************

To taxi:

GIRI LEVERS = MAXIMUM (full aft)

FLAP = UP

P2 = ORDER FORWARD ([)

OAT < 7C CARB HEAT = HOT

************************************

GO AROUND (power):

TRIM = Vref (+20 retained)

GIRI LEVERS = full aft (maximum)

THROTTLE = FULL (aft)

TURN = never

To avoid obstacles:

Always within two minutes:

YOKE = forward pressure

ACCELERATE = 180 KmIAS (Vx)

FLAP = UP

TURN = allowed

PRESSIONE = 0.9C

TRIM = 14 degrees UP

BEGIN (MAX CRUISE) CLIMB PHASE

************************************

OBSTACLE CLEARANCE TAKE OFF:

FLAP = UP

CARB HEAT = COLD

TRIM = 16 degrees UP

GIRI LEVERS = maximum (full aft)

LINE = UP

P2 = RETURN TO SEAT (])

CLOCK = MONITOR

THROTTLE = FULL

RUDDER = PREVENT YAW

YOKE = FULL AFT UNITL UNSTICK

AFTER UNSTICK = NO HUMAN BACKPRESSURE

TRIM = DO NOT VARY FROM +16

ELAPSED TIME = 120 seconds

PRESSIONE = 1.0C (METO)

TRIM = DO NOT VARY FROM +16

Above all distant inland obstacles:

BEGIN METO CLIMB PHASE

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