Whenever the arresting hook experiences a double
There are currently three types of arresting hooks.
wire engagement, strikes the ramp or a deck protrusion,
Type I integral type arresting hook is highly
or approaches but does not exceed 100 arrestments,
heat-treated with an uncoated hook point. Type II
replace designated parts of the complete arresting gear
integral type has a Metco-coated hook point. Type III
mechanism. The removed parts are forwarded to the
detachable hook point is heat-treated, stainless steel or
designated depot-level maintenance activity for test and
alloy, and coated with Colmony or Metco. As an
overhaul. Include the total number of arrestments on
example, the conditional maintenance requirements
the screening and ready-for-issue tags. This number is
cards for a representative aircraft with a type II hook
necessary so that an accurate account of the total num-
assembly requires inspection of the arresting hook
ber of arrestments of each assembly can be maintained.
stinger and centering block after 10 recorded
arrestments. The inspection consists of the following:
Detachable hook points that are removed for in-
spection after 10 arrestments are reinstalled or replaced
1. Checking the hook shank, centering block, and
with new attaching hardware (nut, bolt, washer, etc.).
truss members for cracks, misalignment, and obvious
Install the bolt with the head down and the nut on top. In
damage
all cases, periodic maintenance of the arresting hook
2. Checking the stinger (I-beam and hook point)
assemblies should be in accordance with the applicable
for transverse cracks in the Metco coating, extending to
MIM and/or maintenance requirements cards.
the base metal
SINGLE SHANK CENTERING DEVICES
3. Chipping or gouging in the cable contact
groove
Single shank-type arresting hook assemblies are
4. Cracks or defective bonding of the Metco
held in the centerline position for retraction into their
coating
fuselage recesses. The centering devices prevent side
movement of the assembly during carrier-arrested
Any of these conditions are cause for rejection and
approaches.
replacement of the assembly.
Following inspection or installation of a new
Liquid Spring
arresting gear assembly, apply grease conforming to
that recommended by the applicable MRC and/or the
The representative arresting gear mechanism,
MIM to the cable groove area.
shown in figure 15-5, uses a liquid spring for this
1.
Cotter pin
4A.
Index arm
8. Spacer
12. Bolt
2.
Nut
5.
Shank
9. Cotter pin
13. Centering cam
3.
Washer
6.
Liquid centering spring
10. Nut
14. Drag link
4.
Pin
7.
Shims
11. Washer
Figure 15-5.--Arresting gear mechanism.
15-7
