Yak 52 Air Hose, Main Gear Extend & Emergency Extend, Part Number 6-4-1-340
This hose supplies air to the Diverter Valve on the Main Gear Actuator to extend the Yak 52's Main wheel. It is shown as number 90 on the factory schematic.
While we have colored them Red and Green, this is the correct hose for both the normal Extension line and the Emergency Line.
Note that the Emergency line will always connect to the larger side of the Diverter Valve on the actuator - see image.
On the Wing bulkhead, connect the Normal Extension hose to the front-most fitting , and connect the Emergency Extension hose to the downward facing fitting in the middle of the three.
2 hosesper Gear Leg, 4 per airframe.
New Russian hose material meeting the factory specifications has been used, plus good-condition used Russian hose fittings.
This part should be installed on a Yak 52 with standard Main gear. No fitness for use should be assumed if this hose is installed on any other Main gear/airframe combination.
Once you've fitted this new hose, don't throw your old one away ! If the Original Russian hose fittings on your old hose are in good shape, please cut the ends off and ship them to us.
For each well cared-for RUSSIAN metric hose-end fitting, once received, inspected and deemed acceptable by us we'll send you an electronic refund (not to exceed $15 US per hose end) .
The blog has more details on our unambiguous accept / reject criteria.