SkyView
HDX System
General Maintenance Manual, Revision F
Page | 121
9.6
Pitot/Static Leakage Test
This test must be done to make sure there are no leaks in the pitot or static pneumatic tubes.
The check needs to be performed anytime the pitot and static pneumatic tubes are removed
from the ADAHRS module or the EFIS-D10A Standby Display.
This test must be used when performing pitot/static, transponder, or other tests that manipulate
either the pitot or static pressures.
Equipment:
•
Calibrated pitot/static tester
•
Rubber or plastic tube
9.6.1
Pitot System Leak Test Procedure
1. Put a piece of tape over the small hole in lower aft end of pitot tube.
2. Attach a piece of rubber or plastic tubing over pitot tube and close opposite end of tube.
3. Make sure both SkyView HDX Display and EFIS-D10A Standby Display are powered on.
4. Slowly roll up tube until airspeed indicator shows in cruise range of 120-140 Knots.
5. Attach tube to prevent air pressure change and look at airspeed on SkyView HDX Display
and EFIS-D10A Standby Display. After one minute, if there is a leak, pressure in system
will be reduced, and you will see a lower airspeed on the displays.
6. If there is a leak in the system, you must examine and tighten all connections, hoses, and
fittings before you do another check.
7. If there are no leaks, slowly unroll the tubing to let pressure in the instrument slowly return
to ambient pressure.
9.6.2
Static System Leak Test Procedure
1. Make sure that static system is free of restrictions and moisture.
2. Make sure that there are no alterations or deformations to airframe surface that may affect
relation between the air pressure in static pressure system and true ambient static air
pressure for any flight configuration.
3. Close static pressure alternate source control.
4. Attach a vacuum source to static pressure source opening.
5. Make sure both SkyView HDX Display and EFIS-D10A Standby Display are powered on.
6. Slowly apply vacuum source until altimeter indication is a 1,000-foot increase in altitude
indicated on both SkyView HDX Display and EFIS-D10A Standby Display.
7. Cut off vacuum source to make sure that there is a closed system for one minute.
8. If altimeter loss on SkyView HDX Display or EFIS-D10A Standby Display is not more than
100 feet after one minute, then the system is good, and you can slowly release vacuum
until the system goes back to ambient. If altimeter loss is more than 100 feet, tighten all
connections and perform leak test again.