ONFP-01
HUD I
III. Testing the HUD with built-in tests (BIT) 4.4.5.2.1
A. Power-on BIT
1.
Performed automatically when HUD is turned on
2.
Takes less than twenty-five seconds
B. Continuous BIT
1.
Performed automatically in flight
2.
Logs failures for maintenance
C. Interactive BIT 4.4.5.2.2, 4.4.5.4.2
1.
Procedure
a.
Turn on HUD
b.
Observe approach display
c.
Press MODE
d.
Observe graphics pattern
Fig 4: HUD BIT 1
Graphics Pattern
e.
Press each key on the DEP and look for the corresponding
symbol on the scratchpad. Key MODE next to last, as it calls
for the password to enter test 2 (not used by pilots) and this
entry must be cleared by pressing CLR, which ends the
interactive BIT and returns the display to the approach
submode
Key
Scratchpad symbol
1
1
2
2
3, etc.
3, etc.
ENT
ENT
DCL
DCL
SET BARO
BARO
SET DEP (+)
SETDEP +
SET DEP (-)
SETDEP -
DATA
DATA
spare
T-45A
spare
T-45A
MODE
PW
CLR (returns approach display)
(11-95) Original
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