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

 

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CHAPTER 1 INTRODUCTION - TM-11-5840-270-24-10005
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TM-11-5840-270-24-1 Indicator lD-48A/ARN Manual
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Controls and Indicators
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
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
a. Case Assembly. The case assembly consists of
1-2

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