TM 55-1520-240-23-7
9-124.1
LIGHT LEAK TEST
(Continued)
9-124.1
PILOT’S INSTRUMENT PANEL LIGHTS
1.
While performing steps 2 through 4, check pilot’s
instrument lighting. There shall be no white light
leaks from NVG blue/green color lights.
2.
Close circuit breakers in No. 2 PDP (1) as
follows:
a.
PILOT INSTR breaker (2).
b.
INTR FLOOD breaker (3).
c.
CKPT DIM CONT breaker (4).
3.
Turn PLT INST control (5) to BRT. Check the
following lights. Brightness shall increase evenly
as control is turned and light color shall be
blue/green.
a.
Torquemeter (6) has two postlights. Without
74 is internally lit (With 74 ).
b.
Rotor Tachometer (7) two postlights.
c.
Cruise Guide Indicator (8) two lights in brow.
d.
Airspeed Indicator (9) two lights in brow.
e.
Radar Altimeter (10) bezel light.
f.
Attitude Direction Indicator (11) bezel light.
g.
Horizontal Situation Indicator (12) bezel light.
h.
HSI Mode Select Panel (13) lightplate.
i.
Barometric Altimeter (14) two lights in brow.
j.
Rate of Climb Indicator (15) two lights in brow.
k.
Turn and Slip Indicator (16) bezel light.
l.
Radar Altimeter Lighting Control (17)
lightplate.
m.
HSI Mode Select Panel (13) pushbutton
function markings.
4.
Turn control (5) to OFF. Check instrument and
panel lights of step 3. They shall decrease in
brightness as control is turned. When control is
at OFF, panel lights shall be off.
5.
Open circuit breakers (2, 3 and 4) in No. 2 PDP
(1).
9-477
