In '97 the crew a BAe146 jet shut down one engine and later another during an emergency landing.
15min into the flight the crew saw that the oil quantity gauges for No. 2, 3 and 4 engines indicated empty and No.1 gauge indicated less then 1/4 full.
The crew conducted an emergency ILS with the thrust levers set to maximum thrust on No.1 No. 2 set to idle No.3 was shut down No. 4 also set to idle power.
The magnetic chip detectors plugs (MCDP) were removed and found to have no seals.