TM 1–1520–238–T–1
4–110
4–16 ETE – INTERACTIVE FD/LS CHECK
4–16
Personnel Required:
(2)
References:
TM 9-1230-476-20-2
NOTE
The FD/LS End to End (ETE) check is a
continuous limited keystroke execution of all
the maintenance mode FD/LS tests, except
for the APU, generator, and transmission
tests. It is not normally used for routine
maintenance. Unnecessary exercising of this
FD/LS check shortens the operational life
span of flight critical and mission essential
aircraft systems that FD/LS monitors.
For a helicopter with BUCS deactivated,
make sure ASE BUCS circuit breaker on pilot
center circuit breaker panel (fig. 2–6) is open
and locked. DASE FD/LS is an interactive
check which prompts the operator to act. The
DASE FD/LS check is discontinued when an
advisory message 28 VDC BUCS NO–GO is
displayed. Remaining DASE FD/LS check
displays are deactivated and do not occur.
For a helicopter with BUCS deactivated,
BUCS FAIL indicators on the pilot and CPG
master caution and warning panels (fig. 2–9
and fig. 2–36) are normally lit.
Control/switch position changes prompted by
FD/LS must be performed within 30 seconds
of prompt message, or a false NO–GO
message appears.
If FD/LS message on HOD (fig. 2–34) does
not change within 2 seconds after responding
to the prompt (acknowledge), discontinue
FD/LS test; go to appropriate system
operational check.
Primary and utility hydraulics are required for
ETE – FD/LS CHECK.
If the AGPU is selected to provide power to
the aircraft, refer to paragraph 3–1. If the APU
is selected to provide power to the aircraft,
refer to paragraph 3–3.
