Aircraft Technical Manual
Jabiru Aircraft
Pty Ltd
J120, J160, J170, J200/J400, J230/J430, J250/J450 Variants
This document is controlled while it remains on the Jabiru server. Once this no longer applies the document becomes uncontrolled.
ISSUE
1
2
3
4
5
Dated: 29th October 2014
Issued By: AS
Page: 252 of 298
CAUTION
Do not apply positive pressure with airspeed indicator or vertical speed indicator connected to
the static pressure system.
11.5.4 Pitot System Inspection & Leakage Test
Required Tools:
Piece of flexible tube
Parts and Material:
Replacement hoses (if required)
Type of Maintenance:
Line Maintenance
Level of Certification:
L2 or LAME (A&P or LSA Repairman / Maintenance)
Return to Service:
L2 or LAME (A&P or LSA Repairman / Maintenance)
Note that for aircraft equipped with the Dynon Angle of Attack pitot head it is necessary to remove
the pitot head before leak-testing the pitot system.
Ensure the pitot system is free from restrictions by blowing through it. Restricted flow must be
rectified immediately.
Ensure no alternations of airframe have been made which would affect pressure present in the pitot
system during flight. For example, ensure that the pitot probe on the wing strut is straight and that
the static opening at the tip is clear and open.
To check pitot system for leaks:
-
Place a piece of rubber or plastic tubing over pitot tube, close opposite end of tubing and slowly
roll up tube until airspeed indicator registers in the cruise range.
-
Secure tube and after a few minutes recheck airspeed indicator. Any leakage will have reduced
the pressure in the system, resulting in a lower airspeed indication.
-
Slowly unroll tubing before removing it, so pressure may be released gradually - otherwise
instrument may be damaged.
-
If the test reveals a leak in the system, check all connections for tightness.
11.5.5 Blowing Out Lines
Condensation may collect at points in the pitot system and produce a partial obstruction. To clear
line, disconnect airspeed indicator. Using low pressure air, blow from indicator end of line toward
pitot tube.
CAUTION
Never blow through pitot or static lines towards the instruments.
Like pitot lines, static lines must be kept clear and connections tight. When necessary, disconnect
static line at first instrument to which it is connected, then blow the line clear with low pressure air.
Check all static pressure lines for tightness. If hose or hose connections are used, check for general
condition and clamps for security. Replace hose which has cracked, hardened or shows signs of
deterioration.
11.5.6 Removal & Installation of Components
Required Tools:
Drill
Hole saw (if access hole required)
Guide wire
Parts and Material:
Replacement hoses (if required)
Type of Maintenance:
Line Maintenance
Level of Certification:
L2 or LAME (A&P or LSA Repairman / Maintenance)
Return to Service:
L2 or LAME (A&P or LSA Repairman / Maintenance)
