Common sight errors
RESTRICTED
SOME
COMMON
SIGHT
ERRORS
AND
REASONS
A.
oversate tina
Rate quadrant not positioned far enough
downward, i.e. set at too smali an AR angle.
a.
Preset
trail in the rate end.
Roller too small.
C.
Disc speed set in too high.
d. Bombardier does not know how to synch-
ronize raté.
2.
Position of transverse hair out of relation-
ship to position of telescope quadrant.
a.
Can be caused by improper erection of
transverse hair to vertical.
Bottom of gyro tilted to
front when
transverse hair was erected.
Rear of precision mirror was
high
when transverse hair was erected.
3)
Faulty technique in calibrating.
b.
Bottom of gyro tilts to rear when bomb-
Fore and aft bubble is high to front.
2) Incorrect rate of precession caus-
ing
bottom of gyro to move to rear
rapidly.
C. Dirt on one
of the sheaves-or a kinked
cable.
d.
e.
Auto-release closing too late.
Loose terminals leading to auto-release
points.
3.
Bombardier lacks knowledge of synchroniza-
sets in too little rate.
tiolinis reduces the speed of drive of the
telescope
quadrant.
Rate quadrant posi-
tioned
at
too small an
actual range
angle
quadrant.
Both of these
condit-
ions work
together to cause a late re-
lease.
Too much trail set in.
B. Undershooting.
1. Rate quadrant positioned too far downward,
i.e.
set at too, large an AR angle.
a.
Disc
Speed
set in :0o low.
b. subset trail in the rate end.
C.
Roiler slips on disc.
2.
Position of transverse hair is out of rela-
tionship to position of telescope quadrant,
i.e. latter (at
ali or some points in its
rangel
at smalier angle than correspon-
sighting angle. For example,
optics
are open to a
sighting angle of 40°
telescope quadrar, indicator will not
read 40°.
b.
2)
ing.
1)
a.
reduces
the
of
drive
of
the
b.
ding
if
the
the
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