Väike-Sõjamäe 1A, 11415
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Operating instructions have to be followed while ensuring effective aircraft maintenance. First of all care should be taken to ensure that all locking bolts are fitted with serviceable securing pins and that the former are all attached via their respective chains to the cradle and transporter stands. Care should be taken when raising and lowering each castor set, that the transporter stand is adequately supported and that there are no obstructions to the lift or lowering operation. It is advisable that two operators are present when a castor change takes place.
All aviation tools including castors on the transporter stand should be checked for freedom of movement in terms of both rotation and turning facility. The wheel castors can be rotated by using a special handle and locked in one of four positions by means of an indexing spigot. This allows the whole wheel assembly to turn. (The side plates have two short box sections welded to them to facilitate sufficient leverage). The special handles are also used for raising and lowering the castors to the secondary locking position, to allow the transporter stand to sit directly on the ground.
During towing, the forward castors must be in the directional unlocked position, by raising the indexing spigot and the trailing castors must be in the directional locked position. When the stand is being manually manoeuvred in the hanger or for engine changes, all four castors can be in the directional unlocked position.
The workshop or aircraft maintenance area should possess a flat, clean, hardwearing surface. Ground clearance is 100 mm, which should be adequate for normal use.
Operation of the hand-pumps to raise or lower the wheels will give ground clearance of 100mm or 250mm depending on which locking pin position is selected. The 100mm clearance is for general use, whilst the higher clearance is used on inclines or ramps only. By retraction of the cylinder and no locking pin inserted, the transporter stand will sit directly on the ground for shipping and storage purposes.
The greasing of the castors will need regular attention to ensure free rotation and movement. Each castor has a single grease nipple, which should be inspected and greased every six months. All locking pins should be regularly inspected for wear or jamming and replaced if necessary.
Shock absorber pads should receive a visual examination every twelve months or more frequently if the rail stand has been regularly subjected to heavy traffic movement. The shock mounts have a life of 5 – 10 years. They must be replaced when older than 10 years, the rubber mount is deteriorated, rubber is disbonded from the steel mounting plate or the mount does not return to its original shape when the load is removed.
Any examination of the cradle and transporter should ensure that the turning handles are in the stowed position, and that a full complement of locking pins exists for securing. Any shortfall should be replaced.