...
(8)
Vents/Cabin Air/Heat
--
OPEN when
it
is
ascertained that
fire
is
completely extinguished.
' '
DISORIENTATION IN
CLOUDS
.
In
the event
of
a vacuum system failure during flight in marginal
weather, the directional gyro and gyro horizon will be
di~abled,
and the
pilot will have to rely
on
the turn coordinator
or
the turn and
b~k
indi-
cator if
he
inadvertently flies info clouds. The following instructions
assume that only the electrica:Ily-powered turn coordinator
or
.the turn
and
bank indicator
is
operative, and that the pilot
is
_not completely
pro-
ficient in partial panel instrument" flying. : ·
EXECUTING A
180°
.TURN IN CLOUDS.
Upon
entering the clouds,
an
immediate plan should be made to turn
back
as
follows: ·
• ·
(1)
Note the ti1ne
of
the minute
hand
and
observe the.position of the
sweep second
hand
on
the clock. ·
··
,
(2)
When
the sweep second
hand
indicates the nearest half-minute,
initiate a standard
rate
left turn, ·holding the turn coordinator
sY'm-
bolic
aircraft
wing
opposite the lower left
indeX
mark for
60
seconds.
Then roll back to level flight
by
leveling the miniature
air~raft.
--
(
3)
Check accuracy of the turn·
by
observiilg the compasS"heading
which
shoul.d
be the reciprocal
of
the original. heading.
-:
:
(
4)
If
necessary, adjust heading primarily ·with skidding:motions
rather
than rolling motions so that the compass will read more -
accurately.
(
5)
Maintain altitude :
and
airspeed
by
cautious_ application of elevator
control.
Avoid
overcontrolling by keeping the hands off the control
wheel and steering
only
with rudder.
EMERGENCY LET-DOWNS. THROUGH CLOUDS.
. :
If
possible, obtain radio clearance for
an
. emergency descent through
~
clouds.· To guard against a spiral dive, choose·
an
easterly
or
westerly
heading to minimize compass
ca:rd
swings
due
to changing bank angles.
In
addition, keep
h~ds
off the control, wheel
and
ste
-
e~
a' straight course
with rudder control
by
; monitoring the turn coordiriatcir. Occasionally
check the compass heading
anc;l
make minor corrections to hold
an
app
_roxi-
mate course. Before descending into the
clOuds,
set
up
a stabilized let- .
3-5
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