3-12. PNVS NSA REMOVAL FROM NIGHTSIDE TEST BENCH. (CONT)
(c) Push sensor mount handle (6) up to unlock position.
(d) Remove PNVS NSA and place on workbench tabletop on dunnage at least 2 inches high
to protect PNVS NSA cable connector J1.
d. Mounting PNVS NSA on PNVS Turret Holding Fixture.
Use extreme caution when handling PNVS NSA. The edges of elevation
mirror drive bands are sharp and may be harmful if contact is made.
Use caution while removing interface structure insert with mask and
window assemblies from PNVS NSA. Damage to equipment could result
Use caution when handling PNVS NSA. Contact with optical elements or
bands can cause damage or misalinement to equipment.
(1) Move elevation mirror (1, figure 3-21) downward toward NSA housing to protect it from
(2) Remove two Allen screws (2) and remove mask and window assembly (3) from interface
structure insert (4).
(3) Remove interface structure insert from NSA as follows:
(a) Balance NSA (5) on its side (rim) with elevation mirror (1) pointing up.
(b) Loosen five captive Allen screws (6) securing interface structure insert (3) to NSA (6).
(c) Carefully separate interface structure insert from NSA, taking care not to bend NSA guide
(d) Remove NSA cable (8) from center hole of interface structure insert.
(4) Install PNVS NSA on turret holding fixture as follows:
(a) Position NSA (1, figure 3-22) over holding fixture (2) located directly over the word
FRONT stenciled on holding fixture.