check-out. Portions of this test are shown in
1. Attach a control tester to the plocket on the
left side of the seat. You should ensure that the
tester power switch is OFF and the raise-lower
switch is in the mid position. Connect the tester
electrical plug to a 115-volt ac, 60 Hz, single-phase
power source and position the power switch to
To prevent damage to the height adjust-
ment actuator motor because of
overheating, the operating time limit of 30
seconds on and 1 minute off must be
2. Position the raise-lower switch to RAISE
and hold it in that position. You should observe
the current indicated on the control tester ammeter
while the seat travels to the full UP position. The
maximum start current should be 15 amps and
the maximum run current should be 5 amps.
3. Release the raise-lower switch and place a
pencil mark on the actuator shaft at the locking
collar. Now, move the raise-lower switch to
LOWER and hold it in that position. Again, you
should observe the current indicated on the
control tester ammeter while the seat travels to
the full DOWN position. You should notice no
binding while the seat is traveling. The start and
run current requirements are the same as in the
4. Release the raise-lower switch. At this time,
you should measure and record the distance from
the pencil mark on the actuator shaft to the
upper edge of the locking collar. For the test
results to be acceptable, the difference between
the measurements should be 4.93 to 5.06 inches
of total actuator shaft travel.
5. Raise the seat bucket to the mid-travel
position. Position the power switch to OFF.
Disconnect the tester electrical plug from the
power source and disconnect the tester electrical
plocket from the seat.
Airspeed/Altitude Sensor Check-out
The airspeed/altitude sensor (A/AS) must be
removed from the aircraft to perform the check-
out procedure. The following paragraphs describe
the steps of the test procedure. Figures 6-50 and
6-51 show portions of the test.
1. Place the A/AS in the mounting fixture
and secure it to the workbench. Screw the pitot
Figure 6-51.Airspeed/altitude sensor function check.