A castle nut (also called a castellated nut
or slotted nut) with cotter pin is used to secure the wheel hub to the vehicle.
During inspection of new aircraft for contract compliance verification, discovered up elevator cable-to-elevator bellcrank attach bolt nut (castellated nut
) missing its cotter key.
As Taylor soon realized, the castellated nut
, now a piece of flight-deck FOD, also was missing.
He removed the panel to investigate the anomaly and discovered a castellated nut
and washer sitting loose in the panel.
The wheel is held on the axle by this bearing, which, in turn, is retained by a washer and castellated nut
. The inside diameter of the bearing cup is larger than the outside diameter of the washer and nut, so, if the bearing fails, there is nothing to hold the wheel on the axle.
This AD would require replacement of the bolt and self-locking nut on the primary support pin of the main landing gear (MLG) support beam with a new bolt, castellated nut
, washer and cotter pin.
He prepared for an engine installation, took out a bushing and castellated nut
from a MAF bag, and began to install the aft-engine hoist swivel.
In its place, however, was a three-eighths-inch, hex-head bolt and castellated nut
. When maintenance had been done two days earlier, the CVW-11 ARS team had replaced the W-300 wire harness.