Figure 3-12.--Optical characteristics of the lenticular lens.

junction point for various cables of the system, as are all

junction boxes that are a part of the system.

SYSTEM OPERATION,

TROUBLESHOOTING, AND

MAINTENANCE

The following paragraphs provide information on

operating, checking-out, troubleshooting, and main-

taining the SGSI system. We will discuss some of the

things that can be done to keep the SGSI operating

efficiently.

When troubleshooting the SGSI system, you should

refer to the troubleshooting charts in the Stabilized Glide

Slope Indicator (SGSI) Mk 1 Mod 0 (Incorporating

Figure 3-12.--Optical characteristics of the lenticular lens.

Gyro Failure Alarm) for Air Capable and Amphibious

Assault Ships, NAVAIR 51-5B-2, technical manual. By

using the charts/tables in the technical manual for over-

attenuation. The top segment is colored green, the

all system checkout procedures, you will know what

middle segment is amber, and the large bottom segment

controls must be set during the performance of the

is colored red. When projected, the resulting glide path

checkout procedure. These tables also list the location

has the viewing zone as shown in figure 3-13. The GSI

of each control, the necessary instructions for the proper

cell was designed so 1 inch on its face is equal to 1 of

use of these controls, and the normal indications that

arc. Thus, the 1 amber is 1 inch on the cell face.

should be observed during the operation of these con-

trols. When an abnormal indication is observed during

The stowlock assembly provides a means of

the checkout procedures, certain additional procedures

securing the source light indicator in a fixed position

must be performed that use the controls available within

when the system is not in operation. The stowlock

the equipment to establish conditions that enable main-

assembly is located directly below the source light

tenance personnel to isolate malfunctions with a min-

indicator assembly and is secured to the deck-edge

imum use of test equipment. By using these procedures,

boom. The shipbuilder's junction box is used as a

Figure 3-13.--Viewing zone of glide slope indicator.

3-9