MIL-I-81987(AS)
T a b l e 3.7.1.10.2(c)
Reply Message Conversion and Display Requirements
No. of
Display Type, Range and
Bits
Conversion
Resolution (See Note 3)
Information
Replay Message
8
N u m e r i c , 0-- 359 degrees, 1
A/C Heading
Binary to BCD
degree
8
Numeric, 0-12,700 feet, 100
A/C Altitude
Binary to BCD
feet and 0-127,000 feet,
1000 feet
8
Binary to BCD
Numeric, 0-3585 knots, 14
A/C Airspeed
knots
6
Binary to BCD
Numeric, 0-25,200 lbs, 400 lbs
Fuel Status
3
Numeric, 0-7, 1
A/C Type
None
4
Discrete (two groups of two),
Weapons Status
None
0-15 binary
Reply Message
TACAN Station
7
Binary to BCD
Numeric, 0-126, 1
1
Y Mode
Discrete, 0-1 binary
None
9
TACAN Bearing
Binary to BCD
Numeric, 0-359 degrees,
1 degree
Numeric, 0-306, 6 naut. miles,
9
Binary to BCD
TACAN Range
.6 naut. mile
4
Discrete (two groups of two)
Weapons Status
None
0-15 binary
Pilot Ready
Discrete, 0-1 binary
None
Discrete, 0-1 binary
Autopilot Engaged
None
Discretes
Binary to BCD
Numeric, 0-31,1
Reply Message R3A
8
Numeric, -128 to +127 naut.
Target X Position
Mod. 2's
miles, 1 naut. mile
Comp, Binary
to BC D
(See Note 1)
Target Y Position
8
Mod. 2's
Numeric, -128 to +127 naut.
miles, 1 naut. mile
Comp, Binary
to BC D
(See Note 1)
Target Altitude
7
Binary to BCD
Numeric, 0-127,000 feet
1,000 feet
2
Target ID
None
N u m e r i c , 0-4,1
-14-
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