Unscrew filter bowl (18) and carefully
Lubricate high pressure filter packing (19).
lower it to clear element (20) which will remain in the
filter head (21).
Install high pressure filter element (20) in
high pressure filter head (21).
Remove element (20) from high pressure
filter head (21), and remove and discard packing (19).
Install packing (19) and high pressure fil-
ter bowl (18).
Install drain plug (17).
Wipe inside of filter bowls (13, 18) with a
clean lint-free cloth.
Lubricate low pressure filter packing (14).
Wipe bottom of both filter heads (16, 21)
Install low pressure filter element (15) in
with a clean lint-free cloth.
low pressure filter head (16).
Obtain new filter elements (15, 20)
Install packing (14) and low pressure fil-
ter bowl (13).
Install drain plug (12).
The low pressure filter is a 5-micron filter
(Parker P/N 935853Q 5Q TL) and the high
pressure filter is a 2-micron filter (Parker P/N
to the AGPU position.
935852Q 2QH TJ). Both of these filters come
with a packing around the top. Both of these
filters come with a packing around the top.
MAINTENANCE OF ENGINE
Once started, the engine runs up to 100
percent governed speed of 58,737 rpm (+300 rpm, -570
The gas turbine engine (GTE), figure
rpm) and automatically maintains that speed until shut-
4-68, provides pneumatic power
in the form
down. Constant speed is maintained by the fuel con-
compressed air for operation of the aircraft main engine
trol unit (9), which varies fuel supplied to the combus-
start system, environmental system, and other equip-
tion chamber via the fuel nozzle (18). Engine speed is
ment or systems. The engine also provides mechanical
determined by a speed sensor (5) which supplies elec-
power in the form of rotational shaft power for driving a
trical pulses to an electronic control unit. The electronic
generator and a hydraulic pump. The engine delivers
control units sends electrical commands to the fuel con-
pneumatic and shift power either simultaneously or in-
trol unit to increase or decrease fuel to the combustion