Aircraft Technical Manual
Jabiru Aircraft
Pty Ltd
J120, J160, J170, J200/J400, J230/J430, J250/J450 Variants
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ISSUE
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Dated: 29th October 2014
Issued By: AS
Page: 124 of 298
6.38 Nose Undercarriage Leg (all J-Series)
6.38.1 Description
The nose gear comprises a steerable nose wheel mounted on a welded steel assembly with an
aluminium wheel yoke and a rubber spring system.
Several variations of the steel leg assembly have been used on different aircraft models.
On earlier aircraft the wheel yoke is bolted together (Figure 80) while later models use a 1-piece part.
The steel tube is constrained within two Ertalite bushes mounted in a housing which is attached to
the front of the firewall. For some models this housing is moulded in fiberglass, however for the
majority an Aluminium housing is used.
Nose wheel steering is achieved by connecting the rudder pedal assembly to the nose wheel
steering link by push rods. The nosewheel is centred by springs. Some models incorporate a rubber
“soft link” between pedals and nose leg to improve ground handling.
A nose wheel speed fairing (wheel spat) is standard equipment.
Refer to Section 0 for views of the entire leg / steering assembly.
6.38.2 Nose Gear Removal & Installation
Required Tools:
Tools as required in Section 4.2.2.2.
Spanners / Socket Wrench
Torque Wrench
Parts and Material:
Replacement bolts and hardware (if required)
Type of Maintenance:
Line Maintenance
Level of Certification:
L2 or LAME (Owner, A&P or LSA Repairman / Maintenance)
Return to Service:
L2 or LAME (Owner, A&P or LSA Repairman / Maintenance)
1.
Weight or tie-down tail of aircraft to raise nose wheel off floor and remove the nose wheel and
speed fairing as detailed in 4.2.2.
2.
Disconnect nose wheel steering pushrods and steering yoke.
3.
Unbolt steering yoke from the nose leg tube.
4.
Push and pull the nose leg vertically, fwd-aft and side-side in the housing. A small amount of
movement is normal however any excess must be removed before it becomes excessive.
Refer to sections below for details on adjusting the vertical end-float of the leg in the housing or
replacing housing bushes.
5.
Remove upper collar / steering yoke (dependant on aircraft model) from the top of the leg.
6.
Pull the nose wheel strut assembly down from the bushes in the fuselage.
7.
To install the nose gear, reverse the preceding steps.
6.38.3 Nose Gear General Inspection
Inspect steel tube and attachments for dents and straightness.
Inspect rubber spring assembly for damage or perishing of the rubber, or de-lamination of the rubber
from the metal spacers between the rubber blocks. Check that the washer has been fitted at the top
of the rubbers.
Inspect aluminium wheel yoke for damage or bending.
Inspect pivot bushes for wear or damage.
Inspect assembly bolts & hardware
– replace if damaged or corroded.
Inspect bolts/nuts for torque
– see “thick lamination” torque values in Table 2-8.
Repairs to the welded nose leg assembly beam must be referred to Jabiru Aircraft Pty Ltd or our
approved local agent.
6.38.4 Nose Gear End Float Adjustment
