The Norden Bomb Sight manual

THIRTY

DAY IN-

SPECTION

C. L. I.

B. 42-31

U.R. No.

43-434-MQ

To Secure

Counter

Weight

A.

Place the bombsight (and stabilizer of M-ser-

ies) on bench in the shop at normal room tempera-

ture.

B.

Run

all cover plates on bombsight open.

C. Wipe off all exposed

outside of the

all gyros for a period of one hour with

bright metal parts on the

bombsight with clear

carbon tet.

to remove al! foreign

matter and moisture,

par -

ticularly that

D.

resulting

from finger prints.

Cover all exposed bright metal parts,

on the

outside of the bombsight only, with a light coat-

ing of bombsight oil, Grade "L"

, which is supplied

with

the bombsight.

The oil should be applied

with a soft came! hair brush and

particular atten-

tion should

be

paid to any small exposed parts

which

are not plated, i.e.,

bombsight and

auto-

pilot clutches, the flat mechanism, cross trail

mechanism, etc.

E. After

running the gyros, the rotor shaft bear-

Ings will be inspected and

a small drop of Grade

"H" bombsight oil will be applied

after which the

gyros will be operated from one (il

minute,

cover plates and vents will be reinstalled and/or

closed.

F. Store immediately in bombsight

locker or stor-

age case where

the temperature remains between 40°

and 1250 Fahrenheit.

At intervals of thirty (30) days,

the

going

(While running

the sight, all caging knobs will be released to

allow free motion of the gyros and

bearings).

Any number

of measures may be taken to secure

tion it may be accomplished by winding a few turns

of thread between the spindle drive gear, part No.

265549-4, and the Servo Motor pinion gear, part

No. 265548-5.

A drop of shellac on the thread will

help preserve it and the slight increase in weight

i s

practically

negligible.

and

G.

operation

be

repeated.

the

counter

weight

in

the

center

and