Technical Characteristics - TM-11-5840-270-24-10006

TM 11-5840-270-24-1

1-5. Technical Characteristics

Description

Characteristic

Type of input signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Dc levels derived from instrument approach receivers.

Vertical pointer input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

150 - 0 -150 A full sca1e

Horizontal pointer input . . . . . . . . . . . . . . . .

150 - 0 -150 A full scale

250 A to deflect out of view

Horizontal and Vertical flag inputs . . . . . . . . . . . . . . . . . . .

27.5 volts dc 10%, 0.2 amperes max.

Beacon lamp input. . . . . . . . . . . . . . . . . . . . .

Terminal resistance of each

1000 ohms 3% at 25 deg C.

pointer and flag input.

+ 71 deg C. to -55 deg C.

Operating temperature. . . . . . . . . . . . . . . . . . . . . . .

10 to 50 Hz at 5 G's.

Vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 years at 25 deg C.

Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-6. Physical Description

an aluminum case and a bezel assembly in which a

(fig. l-l)

mask and glass are held by spring clips. Captions

GLIDE PATH, LOCALIZER OR RANGE and

a. The Indicator has four moving-element

M A R K E R are printed on the mask in non-

displays, consisting of two main tubular indicating

luminescent green to identify the associated pointer

pointers and two warning flag mechanisms. A glass

function. Two sectors printed adjacent to the lower

covered dial with an aircraft image printed in the

mask opening identify the port (blue) and star-

center, and a beacon lamp assembly are installed in

board (yellow) sections. The yellow and blue

the instrument case, which encloses the entire unit.

fluorescent m a t e r i a l s are in accordance with

Luminescent finish is used on the pointer, flag,

specification

MIL-D-25177.

Zero

correctors

airplane image, indicated lettering, and indicated

mounted in holes in the glass permit external

port and starboard sector areas.

adjustment of the zero current position of the

b. External connections to the Indicator are

localizer and glide path pointers. The beacon lamp

made through a 10-pin receptacle for the pointer

and switch assembly extends through a threaded

and warning flag circuits, and through a 3-pin

opening in the lower left corner of the bezel.

receptacle for the beacon lamp circuit.

b. Mechanism Assembly (fig. 4-3). Four

c. The overall dimensions of the Indicator are

mechanisms (localizer mechanism, glide path

3 inches wide by 3 inches high by 4-15/32

mechanism, localizer flag mechanism, and glide

inches deep. The depth includes the projecting

path flag mechanism) are mounted on a plate

beacon lamp cap. The weight of the Indicator is

attached to the cast aluminum alloy housing. The

approximately 1 pound, 1 ounce.

plate also supports the dial. The dial markings are

coated with luminescent material in accordance

with MIL-L-25142.

c. Pointer and Flag Mechanisms.

(1) Arrangement of mechanisms. The four

mechanisms are identical in construction except

that the pointers are designed for the particular

function of the mechanism. The localizer (vertical)

and glide path (horizontal) pointers are formed

tubing and coated with

from aluminum

luminescent material in accordance with MIL-L-

25142. The vertical and horizontal flags are coated

with red fluorescent material in accordance with

AF Specification No. 14157, type 2, color No. 66.

The word OFF is printed in black on the flags.

d. Housing. The housing MP14 supports the

four mechanisms, the case, the 10-pin connector

and the 3-pin connector.

Figure 1-1. Indicator ID-48A/ARN, front view.

1-7. Detailed Description

(fig. l-l)

a. Case Assembly. The case assembly consists of

1-2