TM 55-1520-228-10
2-48 Change 11
switch (figure 2-19) controls the brightness of the cau-
tion panel lights and the MASTER CAUTION light. The
INST LTS switch must be moved from the DIM position
before the caution panel lights can be dimmed. The
system is so designed that after each initial application
of power, the lamps will illuminate in the bright condition.
c. Warning System. The warning system consists
of five individually illuminated warning light segments
mounted in the MASTER CAUTION and warning light
panel (figure 2-19) on the instrument panel. The pur-
pose of this system is to provide visual indication for day
or night operation that any of the five conditions or com-
binations thereof has occurred. Each fault condition as
it occurs is indicated by a steady illumination of the let-
tering on the particular segment. In addition, an audio
signal sounds when the ENGINE OUT or ROTOR RPM
segment is illuminated and the collective pitch is not in
the full down position. The warning indicator segment
remains illuminated until the fault condition is corrected.
ENGINE OUT Engine N1 speed below
55 $ 3%
XMSN OIL PRESS Transmission oil pressure
below 30 $ 2 psi
XMSN OIL HOT Transmission above
110_C
ROTOR RPM Rotor rpm below 95% $
1.4%
MASTER CAUTION Fault condition in caution
panel
The WARNING LTS TEST switch (figure 2-13 and figure
2-14) is pressed to check for illumination of all the warn-
ing lights.
SECTION XIV. SERVICING, PARKING, AND MOORING
2-73. SERVICING.
a. Servicing Diagram. Refer to figure 2-20 and fig-
ure 2-21.
b. Fuels, Oils, Fluids, Specifications, and Ca-
pacities. Refer to table 2-1.
2-74. APPROVED FUELS, OILS, AND
FLUIDS.
a. Fuels. Refer to table 2-2.
b. Oils. Refer to table 2-3.
c. Fluids. Refer to table 2-4.
2-75. FUEL TYPES. See table 2-2.
a. JP-4. This fuel contains icing inhibitor lended at
the refinery. Commercial Jet B is a JP-4 type fuel; its
mixture may or may not contain icing inhibitors.
b. JP-5 and JP-8. These fuels contain icing inhibi-
tors blended at the refinery. Jet A and Jet A1 are JP-5
type fuels without icing inhibitors.
c. Emergency Fuel. Aviation gasolines (MIL-G-
(5572) without Tricresyl Phosphate (TCP) are desig-
nated as the emergency fuels to be used in this air-
craft.
2-76. USE OF FUELS.
a. JP-4. There is no special limitation on the use of
JP-4 fuel, but limitations are imposed when fuels other
than JP-4 are used.
b. JP-5, JP-8, Jet A, and Jet A1. These fuels may
be added to JP-4 and to each other in any quantities.
c. Emergency Fuels. Aviation gasoline may also
be added to turbine engine fuels in any quantity. Fuel
mixtures containing any amount of Aviation Gasoline
must be recorded in the Remark Section of DA Form
2408-13-1 as an emergency fuel, noting the type of fuel,
additives, and duration of operation. The 6 hour total
engine operation limitation applies.
d. Refer to fuel operation limits, Chapter 5, when
fuels other than JP-4 are used.
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