Figure 3-43.—Recovery Log sheet (NAVAIR Form 13810/4).
REPLACING PURCHASE CABLES
During recovery operations, malfunctions may
develop in the engine and cable system, causing the
purchase
cable to pull out of the sheave
arrangement or break below deck, close to or at the
engine, resulting in shutdown of the system. Also,
conditions occur in which initial reeving of the
engine is necessary or old purchase cable is required
to be replaced by new purchase cable. Any or all of
these conditions can occur on single or endless
reeved engines.
If the old cable is still reeved, do not pull it out.
When possible, the old cable should be used to pull
in the new. Even if the old cable is only partially
reeved, it will prove useful. Reeving is very much
simplified if cable already reeved in the proper way
can be used. A decision must be made for each
particular engine as to whether it is easier to feed
the new cable from the engine and pull from the
flight deck level with a tractor, or feed from the
flight deck and pull from the engine with block and
tackle. In either case, the cable should be pulled
very
slowly,
and communication should be
maintained between engine and flight deck, so that
the pulling can be stopped quickly if there is danger
of pulling a kink into the line. If the purchase cable
is severed below deck but still reeved, isolate the
break and thread a 5/8- or 3/4-inch cable through
the system and butt braze this to the longer length
to provide a continuous line for pulling in the new
cable.
The following procedures should be followed in
replacing purchase cables:
1. Initial reeving of an engine is facilitated by
hand-threading the complete fairlead system and
engine with a length of 5/8- or 3/4-inch cable. After
reeving the 5/8- or 3/4-inch cable, splice and braze
the end to the purchase cable and pull the larger
into the system
with the smaller.
This
smaller-diameter cable is easier to push through the
3-48
