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. 10-13, 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. 10-14). For the
purpose of discussion, assume that an 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
weapon. 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 LUU-2B/B aircraft parachute flares and Mk 58
marine location markers. The adapter (fig. 10-15) is
composed of three separate components—a bracket, an
ejector foot lock, and a hook actuation spring.
Both the hardware adapter kit and practice bomb
adapter is considered to be organizational-level equip-
ment, and are to be maintained in the custody of the
organizational unit.
For further information concerning the Improved
Multiple Ejector Rack (IMER) and Improved Triple
Ejector Rack (ITER), refer to the publication NAVAIR
11-5-603.
REVIEW NUMBER 3
Q1.
The BRU-32/A bomb ejector rack is installed
on the ________ aircraft.
Q2.
What is the maximum capacity of the
BRU-33/A bomb ejector rack?
Q3.
How many individual ejector units can you
attach to the adapter assembly of the ITER?
Q4.
How are IMER and ITER ejector units
numbered?
10-11
Figure 10-14.—IMER/ITER firing sequence.
