Figure 3-9. Oil Screen Types
Repair procedures. Repair usually requires tank removal. Remove tank as follows:
Disconnect oil lines, drain hoses, and bonding wire.
Remove securing straps or other securing devices.
Lift tank out and repair in accordance with applicable maintenance manuals.
Reinstall by reversing the sequence of oil tank removal.
Refill tank with oil.
Repair of self-sealing oil cells. Self-sealing oil cells are repaired in the same way as fuel cells; however,
greater care must be taken in cleaning the cells in preparation for repair work. Refer to applicable maintenance manual.
Magnetic Plugs and Chip Detectors. A magnetic plug consists of a threaded plug containing a magnetic air gap
to attract and hold ferrous particles. A chip detector consists of a magnetic air gap with an electrical connection such that
electrical continuity is established and a warning light comes on in the cockpit when the particles bridge the gap. The
magnetic pole piece and electrical connection may be an integral part of the threaded plug or may be a bayonet type with
a removable center insert and a self-closing valve body so that the center insert can be removed and inspected without
draining the oil, or oil can be drained without unscrewing the threaded plug (valve body). Inspect and test magnetic plugs
and chip detectors whenever they are removed for any reason.
Improper or rough handling of magnetic plugs, chip detectors and their electrical connections
and wiring is the major cause of no warning or false indications.
Removal of magnetic plugs and one-piece chip detectors. Remove and discard lockwire and unscrew plug,
draining the oil.