TM 1-1510-225-MTF
PROCEDCURE
TROUBLESHOOTING
REFERENCE
(h) Check autopilot altitude hold
function as follows:
(1) Fly Aircraft to test altitude.
(2) ALT switch-indicator (flight
director mode selector) - Press
on.
(3) Verify that the aircraft main-
tains the altitude being flown
at the time the ALT hold
switch was pressed.
(i) Check autopilot indicated air-
speed hold function as follows.
(1) Fly aircraft to test airspeed.
(2) IAS switch-indicator (flight
director mode selector) - Press
on.
(3) Aircraft should maintain air-
speed that was being flown at
the time IAS hold switch was
pressed.
(j) Check roll command function of
autopilot as follows:
(1) TURN control knob (autopilot
controller) - Turn to L and R
and verify that autopilot turns
aircraft left or right respec-
tively.
* 2. Slaved compass systems - Check that
systems agree with known magnetic
headings within ±2° and within 3° of
each other.
* 3. Audio control panel and interphone
K1-2
system - Check as follows:
(a) Interphone functional check:
4-9
