TM 5-5420-228-24
VISION BLOCK REPLACEMENT (EARLY MODEL CUPOLA) (Sheet 2 of 3).
Using diagonal cutting pliers
4.
cut lock wire (E) and remove
it from three screws (F) holding
prism lock wedge (G).
Using 7/8 inch socket remove two
5.
screws from outer holes in wedge (G).
Using 7/8 inch socket turn jackscrew
6.
(H) to force wedge (G) from lock
posit ion.
Remove wedge (G) jackscrew (H) and
7.
vision block (D).
WARNING
Cleaning agent specified is flammable.
Use only in well ventilated areas. Keep
away from flames, sparks, or heat. Do
not smoke while using.
Prevent
contact with eyes, mouth, and/or skin.
Wear rubber gloves when performing
cleaning procedures.
Clean all exposed surfaces with
8.
dry cleaning solvent and wipe
dry with cotton rags.
INSTALLATION:
1.
Insert vision block (A) in cupola
body with outside surf ace flush
with cupola surface.
Position wedge (B) slot down with
2.
jackscrew (C) in slot.
3.
Insert wedge (B) with jackscrew
(C) and two outer screws (D) in
cupola body until screws are
finger tight.
Go on to Sheet 3
TA251412
3-11
