Cessna 150M - Static Test Equipment

NOTE
Air bulb with check valves may be obtained
locally from a surgical supply company. This
is the type used in measuring blood pressure.
PRESSURE
THICK-WALLED
SURGICAL HOSE ~
\/ ~
AIR BULB
PRESSURE BLEED-OFF
SCREW (CLOSED)\
WITH CHECK ------.
VALVES
CLAMP~
THICK-WALLED
SURGICAL HOSE
SUCTION
TO APPLY SUCTION:
CHECK VALVE
1. Squeeze air bulb to expel as much air as possible.
2. Hold suction hose firmly against static pressure source opening.
£
"
,/
V/
CLAMP
CHECK VALVE
3.
Slowly release air bulb to obtain desired suction, then pinch hose shut tightly to trap suction in
system.
4. After leak test, release suction slowly by intermittently allowing a small amount of air to enter
static system. To do this, tilt end of suction hose away from opening, then immediately tilt it
back against opening. Wait until vertical speed indicator approaches zero, then repeat. Con-
tinue to admit this small amount of air intermittently until all suction is released, then remove
test equipment.
TO APPLY PRESSURE:
/CAUTION\
Do not apply positive pressure with airspeed indicator or vertical speed
indicator connected into static system.
1. Hold pressure hose firmly against static pressure source opening.
2. Slowly squeeze air bulb to apply desired pressure to static system. Desired pressure may be
maintained by repeatedly squeezing bulb to replace any air escaping through leaks.
3. Release pressure by slowly opening pressure bleed-off screw, then remove test equipment.
Figure 15-3. Static Test Equipment
15-7