TM 9--2350--292--20--1
0187 00--147
0187 00
PREVENTIVE MAINTENANCE CHECKS AND SERVICES INCLUDING
LUBRICATION INSTRUCTIONS -- CONTINUED
TABLE 3 PREVENTIVE MAINTENANCE CHECKS AND SERVICES
INCLUDING LUBRICATION INSTRUCTIONS, SEMIANNUALLY -- CONTINUED
ITEM
NO.
NOT FULLY
MISSION
CAPABLE
IF:
PROCEDURE
LOCATION
ITEM TO
CHECK/
SERVICE
INTERVAL
SEMIANNUALLY
EXTERIOR
56
Auxiliary Power
Unit (HATZ) --
Continued
c. Replace primary fuel filter (4)
(WP 0609 00).
d. Replace secondary fuel filter (5)
(WP 0609 00).
Any fuel
leaks.
e. Remove bottom cap (6) of fuel/water
separator (7) then remove and replace
fuel/water separator filter element (8) and
install bottom cap (6).
f. Tighten fuel and oil connections that
leak.
g. Inspect air system components;
replace if damaged or deteriorated.
h. Service air cleaner. Check for
cleanliness and obstructions. Replace filter
if damaged (WP 0608 00)). Clean if dirty
(TM 9--2350--292--10).
i. Start APU engine (TM
9--2350--292--10). Listen for unusual
noises in engine and generator which
might indicate improper operation.
j. Observe warning lights and oil pressure
gauge to see if unit is functioning properly
(TM 9--2350--292--10). Oil pressure gauge
should indicate approximately 55 to 80 psi
(368 to 551 kPa). Shut off engine.
k. Remove adhesive from thermostatic
switch S1 (9). Using a jumper wire, short
the terminals of thermostatic switch S1 (9)
and observe the sump fan operation.
Apply adhesive (item 25, WP 0716 00) to
exposed terminals of switch S1 (9).
l. Remove adhesive from thermostatic
switch S2 (10). Using a jumper wire, short
the terminals of thermostatic switch S2
(10) and observe the door fan operation.
Apply adhesive (item 25, WP 0716 00) to
exposed terminals of switch S2 (10).
9
10
EMERGENCY FUEL
SHUT-- OFF
PRIMARY SECONDARY
FUEL FILTERS
AUX. POWER UNIT
5
4
6
8
7
Dirty or
obstructed
air cleaner.
Any unusual
noises.
Malfunctioning
lights or low
pressure.
Door fan or
sump fan
does not
operate.
