Pre-flight inspection, continued
RESTRICTED
2. Sight
Pre-
Flight
Inspect-
ion
2. Run stabilizer gyro and servo motor.
Check
servo motor action by engaging the
bombsight clutch and moving the clutch
in each
direction manually.
The directional gyro should
hold its position
in azimuth and the servo motor
should hold the stabilizer brush or isolated sec=
tor contact brush
at a neutral position up to the
slippage point of the
servo clutches.
motor clutches are adjusted to slip at a force of
32 to 36 pounds.
Check clutch tensions of the drift clutch,
manually
The tensions should be such that the drift clutch
vill be first to slip; then the auto-pilot clutch,
and finally the bombsight clutch. These are rough
checks but will serve to detect serious discrep-
ancies in the clutch tensions; however, until the
personnel has developed the sense of touch requir-
ed to make a fairly accurate check of the clutch
tension,
he must always check the clutch tensions
by use
of the spring scales.
The correct tensions are:
Bombsight clutch should slip at a
tension of 18 to 24 pounds.
2. Auto-pilot clutch should slip at a
tension of
10 to 12 pounds.
3. Drift clutch should slip at a ten-
sion of 6 to 8 pounds.
3. Disengage clutches.
4. Turn off the servo
and stabilizer switches.
1. Turn on the bombsight switch
a.
Run sight gyro.
b. Check
coincidence of telescope pointers.
c. Test
P.D.l.
action.
d. Test search knob action.
Test action of telescope drive clutch.
f. Uncage the gyro and test action of the
levelling knobs.
g. Test telescope
motor.
h.
Test
automatic
release.
i.
Check aititude
knob
for correct funct-
loning and governina action
at high and
low
speeds for each
position of the disc
speed
change lever.
1.
If night bombing is contemplated, check
the bubbie and telescope cross-hair lights
k.
and
rheostat.
Test
action
of increased forward vision
40