at figure 10-28. It shows the mechanical operation of
the ejector unit.
When a store is loaded onto the ejector unit, the store
suspension lugs force the suspension hooks to the closed
position. The suspension hooks are locked in the closed
position by the overcenter position of the hook toggle
levers. The link stops, located over each of the hook
toggle levers, prevent the suspension hooks from
opening until the cartridge is fired or the manual release
lever is pulled, even if the safety stop lever is in the
unlocked position (fig. 10-28, view A).
When the gas-generating cartridge is fired, the
resulting gas pressure moves the breech aft. The aft
movement of the breech also moves the hook release rod
aft, lifting the toggle hook levers from the overcenter
position. The cranks are forced down. This unlocks the
suspension hooks (fig. 10-28, view B).
Gas pressure from the cartridge acting against the
gun piston, plus the weight of the store, forces the
unlocked suspension hooks to open, releasing the store.
The hooks are held in the open position by the hook
toggle spring and coil spring. The gun piston continues
to act against the store to provide positive separation
from the ejector unit (fig. 10-28, view C).
IMER/ITER ELECTRICAL OPERATION.
Before discussing the electrical operation of the
IMER/ITER, you must understand the function of
several electrical components. These components are
briefly discussed in the following paragraphs.
IMER and ITER ejector units are numbered
according to their firing sequence (fig. 10-29). For the
purpose of discussion, assume that a IMER has stores
loaded on stations 1, 2, 4, and 6, and that the release
mode selector is set for single release.
When the pilot depresses the cockpit bomb button,
a firing pulse is routed from the aircraft through the rack
safety switch and the release mode selector switch to
energize the necessary rack circuits. With a weapon
loaded on station 1, the forward suspension hook is in
the closed position, automatically closing the stores
sensing switch. The firing voltage is then routed to the
firing circuit, firing the cartridge and ejecting the
Ejection of the stores from all remaining
loaded stations will occur in sequence each time the pilot
presses and releases the bomb button. In this particular
load, stations 3 and 5 were not loaded; therefore, make
sure the forward hooks are left open. If they are closed,
the stores sensing switch signals the rack that a weapon
is loaded on that station and will not automatically step
to the next station.
Hardware Adapter Kits
Hardware adapter kits are used to adapt the
IMER/ITER to various aircraft. The kits include
electrical harness assemblies, suspension lugs, sway
brace pads and extensions, and attaching hardware
required to configure the racks for a desired pylon
station on a particular aircraft. Additionally, practice
bomb adapters are used to adapt the IMER and ITER for
the attachment of practice bombs or externally carried
Figure 10-29.IMER/ITER firing sequence.