Boeing F4B-1 - Page 23

90 pages

Save Page as PDF

To Next Page

To Next Page

To Previous Page

To Previous Page

Loading...

38. MACHINE

GUN

INSTALLATION-30

Cal.

Right:

a.

Dismount

the

50 cal.

gun

as

follows,

first

removing

the

necessary

cowling:

Loosen

the

blast

tube

connection

to

the

gun.

Disconnect

the

impulse

wires

from

the

trigger

motor.

Remove

the

trunnion

and

mounting

post

bolts

and

the

gun

may

be

withdrawn

through

the

cockpit.

b.

Remove

the

50

and

30 cal.

housings

under

the

ammunition

reels

and

remove

the

ammunition

on

the

reels.

Remove

the

bolt

through

the

lower

end

of

the

rear

reel

spindle

support

and

rotat~

the

support

clear

of

the

spindle.

Turn

the

spindle

about

45°

anti-clockwise

and

draw

out.

Remove

the

50 cal. reel

and

install

the

30

cal.

reel.

Note

that

additional

washers

placed

between

the

reels

and

a

bushing

is

installed

on

the

fore

end

of

the

spindle.

Rotate

the

spindle

clockwise

to

lock

and

replace

the

rear

spindle

support.

Swing

the

rear

mounting

post

block

into

place

and

fasten

it.

Remove

the

,50

cal.

ammunition

chute,

loosen

the

clamp

for

the

feed

chute,

rotate

90 °

aft

and

install

30

cal.

feed

chute.

Install

30 cal.

ejection

chute,

relocating

the

inside

clamp

to

agree

with

the

chute.

Change

the

reel

brake

to

the

30 cal.

setting.

Transfer

the

indicator

from

the

50 cal.

to

the

30

cal.

reel

housing

and

install

the

housings.

c.

Move

the

control

cable

housing

stop

to

the

lug

approximately

two

inches

aft.

d.

Install

the

30 cal. gun

and

connect

the

impulse

wire

and

housing.

e.

Align

the

gun

as

described

in

paragraph

37, c.

f.

Lock

all

bolts

and

replace

the

cowling.

39.

MACHINE GUN

SIGHT

INSTALLATION:

a.

Aldis

unit

sight.

Level

the

airplane

as

directed

in

paragraph

10,

page

13.

Stretch

a line

from

the

top

rudder

hinge

to

an

upright

on

the

crankshaft,

the

line

to

be

plumb

over

the

thrust

line.

Install

the

unit

sight

brackets

in

the

first

and

third

holes

forward

of

the

cockpit,

½

inch

to

the

right

of

the

center

line

of

the

airplane

and

adjust

the

height

approxi-

mately

to

suit

the

hole

in

the

windshield.

Remove

the

eye

rest

from

the

sight.

Place

the

sight

in

the

brackets.

Replace

the

eye

rest.

Adjust

the

fore

and

aft

position

of

the

sight

to

suit

the

pilot

and

lock

in

place.

Level

the

sight

by

means

of a

spirit

level

so

that

the

center

line

of

the

sight

is

14

1/s

inches

above

the

top

of

the

upper

longeron

and

secure

the

vertical

adjust-

ment

of

the

mounting

posts.

Center

the

eye

piece

of

the

sight

in

the

windshield

opening

by

means

of

the

slotted

holes

in

the

bracket

and

lock

in

place.

Adjust

the

sight

parallel

to

the

thrust

line

by

means

of

offsets

from

the

plumb-

line

and

lock

the

front

bracket.

B.

C-3

sight.

This

sight

may

be

installed

either½

or

2½

inches

to

the

right

of

the

center

line of

the

airplane,

sockets

being

provided

accordingly

.

Install

the

adapter

in

the

forward

hole

of

the

sight

mount

with

sight

socket

to

the

rear

and

lock

in

place.

Set

the

vertical

adjustment

of

the

sight

in

its

mid

position

.

Install

the

sight

and

level

with

a

spirit

level

so

that

its

center

line

is

14

1/s

inches

above

the

top

of

the

upper

longeron.

Lock

the

vertical

adjm;tment.

c.

Ring

and

bead

sight.

Install

the

bead

sight

in

the

rear

socket

to

the

left

of

the

center

line ot

the

airplane.

Adjust

vertically

so

that

the

center

of

the

bead

is

141/s

inches

above

the

top

of

the

upper

longeron,

and

lock

in

position.

Install

the

ring

sight

in

the

socket

located

12

inches

forward

of

the

bead

sight.

Adjust

the

center

of

the

ring

sight

to

the

same

height

as

the

bead

sight

and

lock

in

position.

Adjust

the

ring

sight

laterally

by

means

of

offsets

from

the

center

line so

that

its

lateral

distance

from

the

center

line

is

equal

to

that

of

the

bead

sight.

d.

It

is

recommended

that

the

sight

installations

be

checked

by

firing

the

guns

at

a

target.

This

may

be

accomplished

by

supporting

the

tail

of

the

airplane

so

that

the

thrust

line

is

approximately

level

and

then

firing

the

guns

into

a

target

set

up

at

the

desired

range.

The

sights

should

then

be

brought

into

agreement

with

the

guns.

40. CAMERA

GUN

INSTALLATION: a .

The

Cl'l;mera

gun

is

installed

on

the

top

of

the

upper

wing

on

the

center

line

of

the

airplane.

It

is

secured

to

the

wing

by

a

tripod

mount

which

is

bolted

to

fittings

on

the

front

and

rear

spars.

The

word

"Camera"

will

be

found

stenciled

on

the

fabric

near

the

fittings.

b.

If

the

mount

has

not

been

installed

previously,

locate

the

holes

in

the

fittings

by

means

of

an

awl

or

similar

tool.

Punch

through

the

fabric

and

re-tap

the

holes

with

a 10-32

USF

tap.

Adjust

the

rear

and

right

hand

legs of

the

camera

mount

to

suit

the

fittings

and

bolt

in

place.

Use

lockwashers

to

secure

the

bolts.

38

...

_J

I

ll"~

_J

~;

0

0/.

'z

m <

a:i

I: I:

0

0

0

lll

u

m <'l lll

~

_J

I 0

i'

~<{~

Ii

~

lt

-~

<(

g

~ ~>~

39

...

II)

;

:.i

w

>

i

Ii

~

I-

~

~

~

<(

...

l-

g

IJ

II)

<(

w

..J

w

Ii

0

:';

~

O'

~

5

i

i

I-

<(

~

<(

0:::

c.,

<(

C

_J

0

a:

I-

z

0

(.)

en

~

0

en

I

in

C\J

ci

LL

Related product manuals

Preview: Boeing ForeFlight Sentry

Boeing ForeFlight Sentry

Preview: Boeing 737-300 Series

Boeing 737-300 Series

Preview: Boeing 777-200

Preview: Boeing 737-300