Table 2-1. Preventive Maintenance Checks and Services for Model M992A1
Not Fully Mission
Open APU front door and check
APU engine oil level. Add oil to
bring level up to full (F) mark on
dipstick. Add or drain as needed.
Turn MASTER switch and APU
Class III leak found.
FUEL SHUT OFF switch to ON.
Drain the primary APU fuel filter
(back against wall) first and then the
secondary filter until contaminants
are removed. Turn APU FUEL
SHUT OFF switch and MASTER
switch to OFF. Inspect fuel lines
and hoses for damage, leaks, and