AN/ASG-31 Lead Computing Optical Sight System
The AN/ASG-31 is designed to aid in air-to-air aiming of AIM-9 missiles and cannons, and in air-to-
ground employment of bombs, unguided rockets and guns. The system calculates and displays aiming
markers for missiles and guns employment in MSL, DM, DG and A/A1 or A/A2 modes.
The AN/ASG–31 consists of:
• Gyro Lead Computer (GLC);
• Optical Display Unit (ODU).
When only the AN/ASG–31 is used for air-to-air attacks, following markers and indicators will not be
available: range bar, range index, in-range, minimum range and excess-g. In this case, the distance to
the target can be estimated by comparing the visible target size with the reticle circle diameter.
Table 4. Optical sight controls and indicators
1. Mode Selector OFF — Turns off the AN/ASG-31.
MSL — Selects missile mode. Reticle pipper is caged to ARL (armament
reference line).
A/A1 GUNS — Selects guns mode for a maneuvering target.
A/A2 GUNS — Selects guns mode for a target maneuvering at a
constant angular velocity.
MAN — Selects AN/ASG–31 manual control mode.
2. Slip Indicator Indicates aircraft slip or skid.
3. Reticle Displays aiming markers.
Size is 50 mils.
The reticle can be used to estimate the distance to the target by
comparing the size of the reticle ring to the visible target size.
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