Beechcraft C-12C Operator And Technical Reference Manual page 846

TM 1-1510-218-10
passenger discomfort due to imposing high load
factors.
b. Climb Maximum Rate.
climb performance is obtained by setting propellers at
2000 RPM, torque at 100% (or maximum climb TGT),
and maintaining best rate-of-climb airspeed.
airspeed will vary with gross weight and must also be
reduced as available power is reduced with altitude.
As a rule of thumb, reduce airspeed approximately one
knot for each 2,000 feet of altitude above that altitude
where maximum power cannot be maintained. Refer
to Chapter 7 for rate of-climb airspeed for specific
weights.
1. YD switch – As required.
2. Cabin pressurization – Check.
RATE control knob so that cabin rate-of-
climb equals one-third aircraft rate-of-climb.
3. AUTOFEATHER switch – As required.
4. BRAKE DEICE – As required.
Turn the windshield heat on to
NORMAL when passing 10,000 feet
MSL or prior to entering the freezing
level, whichever comes first. Leave
on until no longer required during
descent for
temperature may be selected as
required after a minimum warmup
period of 15 minutes.
5. WSHLD ANTI-ICE – As required.
6. Wings and nacelles – Check.
7. TCAS – Set range.
O
8-36. CRUISE.
Cruise power settings are entirely dependent
upon the prevailing circumstances and the type of
mission being flown. Refer to Chapter 7 for airspeed,
power settings, and fuel flow information.
following procedures are applicable to all cruise
requirements.
1. Power – Set.
graphs contained in Chapter 7. To account
for ram air temperature increase, it is
essential that temperature be obtained at
stabilized cruise airspeed.
using RPM and torque as the primary
control. Maximum allowable torque must
not be exceeded and TGT must also be
observed as a separate limit.
8-20
Maximum rate of
This
Adjust
NOTE
landing. HIGH
Refer to the cruise power
Power is set
A new engine operated at the torque value
presented in the cruise power charts will
show a TGT margin below the maximum
cruise limit for the torque value presented
in the charts. With ice vanes retracted, if
cruise torque settings shown on the cruise
power charts cannot be obtained without
exceeding TGT limits, the engine should be
inspected.
2. ICE & RAIN switches – As required.
Ensure that anti-ice equipment is activated
before entering icing conditions.
Ice vanes
operating in visible moisture at +5 °C or
less. Visible moisture is any form of
clouds, ice crystals, snow, rain, sleet, hail,
or any combination of these.
3. CABIN SIGNS switch – As required.
4. AUXILIARY fuel gauges – Monitor. Ensure
that fuel is being transferred from auxiliary
tanks. (Chapter 2, Section IV.)
5. Altimeters – Check.
setting complies with transition altitude
requirement.
6. Engine instrument indications – Noted.
Check all engine instruments for normal
indications.
7. RECOG lights – As required.
8. TCAS – Set for en route.
O
8-37. DESCENT.
Descent from cruising altitude should normally
be made by letting down at cruise airspeed with
reduced power. Refer to Chapter 7 for power settings
and rates of descent.
The
Cabin pressure
adjusted prior to starting descent.
a. DESCENT – Max Rate (Clean). To obtain
the maximum rate of descent in clean configuration,
perform the following.
1. Cabin pressurization – Set. Adjust CABIN
CONTROLLER dial as required and adjust
RATE control knob so that cabin rate of
descent equals one-third aircraft rate of
descent.
NOTE
NOTE
must be extended
Verify that altimeter
NOTE
controller should
when
be