TM 55-1520-240-T
16-4.2 HEADS UP DISPLAY SYSTEM VISUAL CHECK (Continued)
TASK
RESULT
1.
Check Converter Control Unit (1).
If any switch, indicator, or control panel (1) is damaged, replace
item as required.
2.
Check HUD control switch (2) on pilot's
If either switch (2) is damaged, replace
(3) and copilot's (4) thruster grip.
HUD Control Switch.
3.
Check HUD SYS circuit breaker
If either circuit breaker (5 or 6) is damaged,
(5) and HUD REF circuit breaker (6)
replace circuit breaker.
on copilot's circuit breaker panel (7).
4.
Check Air Data Transducer (8).
If transducer (8) is loose or damaged, tighten or replace it as
required. If connector to transducer is loose or damaged,
tighten or replace as required. If wiring to connector is
damaged, repair or replace it as required.
5.
Check Signal Data Converter (9).
If converter (9) is damaged or any LED on the converter is
defective, replace it. If converter is loose, tighten it. If any
connector to converter is loose or damaged, tighten or replace it
as required. If wiring to a connector is damaged, repair or
replace it as required.
6.
Check Inclinometer (10).
If Inclinometer (10) is loose or damaged, tighten or replace it as
required. If connector to Inclinometer is loose or damaged,
tighten or replace it as required. If wiring to the connector is
damaged, repair or replace it as required.
7.
Check pilot's or copilot's Display Unit's
If either Optical Unit (11) or Power Supply
(if available) Optical Unit (11) and Power
Calibration Unit (12) is damaged, replace the
Supply Calibration Unit (12).
Display Unit. If the cable between the units is damaged, repair
or replace it as required.
FOLLOW-ON MAINTENANCE:
If the Converter Control Unit (1), Air Data Transducer (8), Signal Data Converter (9), Inclinometer (10), or a Display Unit (11) and
Power Supply Calibration Unit (12) is replaced, an operational check (16-4.3) must be performed.
END OF TASK
Change 18 16-149
