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TM 11-6625-646-15
C1
distributed to pins 22 of receptacles J63, J64, and J65
the SAS amplifier normally operates at full gain.  To
through contacts 1 and 2 of AXES METERS READ
check its half-gain operation, the SAS amplifier gain-
switch S4, to receptacle J60 pins F and E, through
control relay must be energized.  Gain-control relay
HALF GAIN switch S3 and FULL GAIN indicator light
operation is controlled by HALF GAIN switch S3.  It
DS2.
connects 32 volts dc from the test set power supply
through J60 pin F to the control side of the relay
winding.
The other side of the relay winding is
1-40. Pneumatic System
connected to ground through J60 pin G. FULL GAIN
indicator DS2 monitors gain control relay operation.
When operated, the gain control relay contacts open a
1-41. Pitot and static pressure for the air- speed sensor
ground connection at J60 pin E and indicator DS2 goes
and differential pressure for the sideslip sensor, required
out.
for testing the SAS amplifier yaw channel is simulated
by the test set pneumatic system. An electrically driven
1-37. Power Supplies
air pump supplies the air pressure.  The pump is
energized when the PUMP switch S2 is operated to its
on (UP) position.
1-38. Ac Power Circuit
a. Two front panel indicators, AIRSPEED and
The 115-volt single-phase 400-cycle supply voltage is
DIFF. PRESSURE, monitor the simulated airspeed and
supplied to the test set through receptacle J62 pin C.
differential pressure supplied to the sensors. Two front
Pin A provides the ground return. This voltage is routed
panel regulator valves, AIRSPEED REG and DIFF.
through 115V 400-POWER circuit breaker switch S1 to
PRESS.  REG. enable the operator to control the air
power indicator DS1 and to the primary winding of
pressure.
transformer T501.  The 26-volt ac output from the
b. With the AIRSPEED REG valve turned slowly
secondary of T501 is distributed to pins 19 of
clockwise (from its top center position) positive pressure
receptacles J63, J64, and J65, to pin 14 of receptacle
is applied to the pitot (P) fitting on the test set and to the
J66, to pin 18 of receptacle J70, to pin 18 of receptacle
P connection of the AIRSPEED indicator. At the same
J67, and to pin 12 of receptacle J68. Also, 115-volt ac
time, static pressure (vacuum) is applied to the static (S)
operating voltage is connected through contacts 8 and 4
fitting on the test set and to the S connection of the
of adapter switch wafer S5A (front) to SAS amplifier
AIRSPEED indicator. Simulated airspeed is indicated in
receptacle J60 pin i.
knots.
Figure 1-4. Function meter circuit, simplified
Figure 1-5. Test set, schematic diagram.
schematic.
(Located in back of manual.)
(Located in back of manual.)
c. With the DIFF. PRESS. REG. valve turned
slowly clockwise (from its top center position) air
1-39. Dc Power Circuit
pressure is applied to the R fitting on the test set and to
Twenty-six volts ac from the test set ac power supply is
the DIFF. PRESSURE indicator. The indicator pointer
connected to receptacle J66 pin 14.  This voltage is
will move to the right (R) and indicate the simulated
rectified and filtered to 32 volts de by the network
differential pressure.
consisting of diodes CR201 and CR202, resistor R204,
d. With the DIFF. PRESS. REG. valve turned
and capacitor C201. It is further regulated to 27 volts dc
slowly counterclockwise, air pressure is applied to the L
by Zener diode CR501. The regulated dc is distributed
fitting on the test set and to the DIFF.  PRESSURE
to pins 2 and 5 of receptacle J66, to pin 7 of receptacle
indicator. The indicator pointer will move to the left (L)
J71, to pin 7 of receptacle J69, to pins 16 of receptacles
and indicate the simulated differentia pressure.
J63, J64, and J65 through pins 5 and 6 of AXES
METERS READ switch S4, and to pin A of SAS
amplifier receptacle J60. The unregulated 32 volts dc is
15

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